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1

Computational fluid dynamic applications  

SciTech Connect

The rapid advancement of computational capability including speed and memory size has prompted the wide use of computational fluid dynamics (CFD) codes to simulate complex flow systems. CFD simulations are used to study the operating problems encountered in system, to evaluate the impacts of operation/design parameters on the performance of a system, and to investigate novel design concepts. CFD codes are generally developed based on the conservation laws of mass, momentum, and energy that govern the characteristics of a flow. The governing equations are simplified and discretized for a selected computational grid system. Numerical methods are selected to simplify and calculate approximate flow properties. For turbulent, reacting, and multiphase flow systems the complex processes relating to these aspects of the flow, i.e., turbulent diffusion, combustion kinetics, interfacial drag and heat and mass transfer, etc., are described in mathematical models, based on a combination of fundamental physics and empirical data, that are incorporated into the code. CFD simulation has been applied to a large variety of practical and industrial scale flow systems.

Chang, S.-L.; Lottes, S. A.; Zhou, C. Q.

2000-04-03T23:59:59.000Z

2

Sandia National Laboratories: Computational Fluid Dynamics Simulations...  

NLE Websites -- All DOE Office Websites (Extended Search)

Canal, Yakima Washington Sandia Publishes Five Reports on the Environmental Effects of Wave-Energy Converters Computational Fluid Dynamics Simulations Provide Insight for Rotor...

3

Determining effects of turbine blades on fluid motion  

DOE Patents (OSTI)

Disclosed is a technique for simulating wind interaction with wind turbines. A turbine blade is divided into radial sections. The effect that each of these radial sections has on the velocities in Eulerian computational cells they overlap is determined. The effect is determined using Lagrangian techniques such that the calculations need not include wind components in the radial direction. A force on each radial section of turbine blade is determined. This force depends on the axial and azimuthal components of the fluid flow in the computational cell and the geometric properties of the turbine blade. The force on the turbine blade is fed back to effect the fluid flow in the computational cell for the next time step.

Linn, Rodman Ray (Los Alamos, NM); Koo, Eunmo (Los Alamos, NM)

2011-05-31T23:59:59.000Z

4

Determining effects of turbine blades on fluid motion  

DOE Patents (OSTI)

Disclosed is a technique for simulating wind interaction with wind turbines. A turbine blade is divided into radial sections. The effect that each of these radial sections has on the velocities in Eulerian computational cells they overlap is determined. The effect is determined using Lagrangian techniques such that the calculations need not include wind components in the radial direction. A force on each radial section of turbine blade is determined. This force depends on the axial and azimuthal components of the fluid flow in the computational cell and the geometric properties of the turbine blade. The force on the turbine blade is fed back to effect the fluid flow in the computational cell for the next time step.

Linn, Rodman Ray (Los Alamos, NM); Koo, Eunmo (Los Alamos, NM)

2012-05-01T23:59:59.000Z

5

COMPUTATIONAL FLUID DYNAMICS INCOMPRESSIBLE FLOW  

E-Print Network (OSTI)

to numerically solve the Euler equations in order to predict effects of bomb blast waves following WW II­71, and was published the following year [1]. Computing power at that time was still grossly inadequate for what we.S., in Europe (especially France, Great Britain and Sweden) and in the (former) Soviet Union. Today

McDonough, James M.

6

Three-Dimensional Computational Fluid Dynamics  

SciTech Connect

Computational fluid dynamics (CFD) is one discipline falling under the broad heading of computer-aided engineering (CAE). CAE, together with computer-aided design (CAD) and computer-aided manufacturing (CAM), comprise a mathematical-based approach to engineering product and process design, analysis and fabrication. In this overview of CFD for the design engineer, our purposes are three-fold: (1) to define the scope of CFD and motivate its utility for engineering, (2) to provide a basic technical foundation for CFD, and (3) to convey how CFD is incorporated into engineering product and process design.

Haworth, D.C.; O'Rourke, P.J.; Ranganathan, R.

1998-09-01T23:59:59.000Z

7

The incorporation of bubbles into a computer graphics fluid simulation  

E-Print Network (OSTI)

We present methods for incorporating bubbles into a photorealistc fluid simulation. Previous methods of fluid simulation in computer graphics do not include bubbles. Our system automatically creates bubbles, which are simulated on top of the fluid...

Greenwood, Shannon Thomas

2005-08-29T23:59:59.000Z

8

Petascale Adaptive Computational Fluid Dynamics | Argonne Leadership  

NLE Websites -- All DOE Office Websites (Extended Search)

Petascale Adaptive Computational Fluid Dynamics Petascale Adaptive Computational Fluid Dynamics PI Name: Kenneth Jansen PI Email: jansen@rpi.edu Institution: Rensselaer Polytechnic Institute The specific aim of this request for resources is to examine scalability and robustness of our code on BG/P. We have confirmed that, during the flow solve phase, our CFD flow solver does exhibit perfect strong scaling to the full 32k cores on our local machine (CCNI-BG/L at RPI) but this will be our first access to BG/P. We are also eager to study the performance of the adaptive phase of our code. Some aspects have scaled well on BG/L (e.g., refinement has produced adaptive meshes that take a 17 million element mesh and perform local adaptivity on 16k cores to match a requested size field to produce a mesh exceeding 1 billion elements) but other aspects (e.g.,

9

Computational Fluid Dynamics of rising droplets  

SciTech Connect

The main goal of this study is to perform simulations of droplet dynamics using Truchas, a LANL-developed computational fluid dynamics (CFD) software, and compare them to a computational study of Hysing et al.[IJNMF, 2009, 60:1259]. Understanding droplet dynamics is of fundamental importance in liquid-liquid extraction, a process used in the nuclear fuel cycle to separate various components. Simulations of a single droplet rising by buoyancy are conducted in two-dimensions. Multiple parametric studies are carried out to ensure the problem set-up is optimized. An Interface Smoothing Length (ISL) study and mesh resolution study are performed to verify convergence of the calculations. ISL is a parameter for the interface curvature calculation. Further, wall effects are investigated and checked against existing correlations. The ISL study found that the optimal ISL value is 2.5{Delta}x, with {Delta}x being the mesh cell spacing. The mesh resolution study found that the optimal mesh resolution is d/h=40, for d=drop diameter and h={Delta}x. In order for wall effects on terminal velocity to be insignificant, a conservative wall width of 9d or a nonconservative wall width of 7d can be used. The percentage difference between Hysing et al.[IJNMF, 2009, 60:1259] and Truchas for the velocity profiles vary from 7.9% to 9.9%. The computed droplet velocity and interface profiles are found in agreement with the study. The CFD calculations are performed on multiple cores, using LANL's Institutional High Performance Computing.

Wagner, Matthew [Lake Superior State University; Francois, Marianne M. [Los Alamos National Laboratory

2012-09-05T23:59:59.000Z

10

High-performance computing in computational fluid dynamics: progress and challenges  

Science Journals Connector (OSTI)

...Issue New science from high-performance computing organized by Richard Catlow...Tildesley and Maggie Wilson High-performance computing in computational fluid...far the largest user of high-performance computing (HPC) in engineering...

2002-01-01T23:59:59.000Z

11

Computational fluid dynamics modeling of coal gasification in a pressurized spout-fluid bed  

SciTech Connect

Computational fluid dynamics (CFD) modeling, which has recently proven to be an effective means of analysis and optimization of energy-conversion processes, has been extended to coal gasification in this paper. A 3D mathematical model has been developed to simulate the coal gasification process in a pressurized spout-fluid bed. This CFD model is composed of gas-solid hydrodynamics, coal pyrolysis, char gasification, and gas phase reaction submodels. The rates of heterogeneous reactions are determined by combining Arrhenius rate and diffusion rate. The homogeneous reactions of gas phase can be treated as secondary reactions. A comparison of the calculated and experimental data shows that most gasification performance parameters can be predicted accurately. This good agreement indicates that CFD modeling can be used for complex fluidized beds coal gasification processes. 37 refs., 7 figs., 5 tabs.

Zhongyi Deng; Rui Xiao; Baosheng Jin; He Huang; Laihong Shen; Qilei Song; Qianjun Li [Southeast University, Nanjing (China). Key Laboratory of Clean Coal Power Generation and Combustion Technology of Ministry of Education

2008-05-15T23:59:59.000Z

12

Computational Fluid Dynamics Study of Aerosol Transport and Deposition Mechanisms  

E-Print Network (OSTI)

In this work, various aerosol particle transport and deposition mechanisms were studied through the computational fluid dynamics (CFD) modeling, including inertial impaction, gravitational effect, lift force, interception, and turbophoresis, within...

Tang, Yingjie

2012-07-16T23:59:59.000Z

13

Reducing Toxic Exposure In Buildings: Application of Computational Fluid  

NLE Websites -- All DOE Office Websites (Extended Search)

Reducing Toxic Exposure In Buildings: Application of Computational Fluid Reducing Toxic Exposure In Buildings: Application of Computational Fluid Dynamics (CFD) Speaker(s): Buvana Jayaraman Date: December 8, 2005 - 12:00pm Location: Bldg. 90 I investigate three applications related to toxic exposure in buildings and demonstrate the use of Computational Fluid Dynamics (CFD) to address important issues: 1. Improving containment of airborne hazardous materials in an existing room containing a downdraft table. CFD is used to find a ventilation configuration that ensures better containment of the hazardous material and hence improved worker safety. 2. Modeling gas transport in a large indoor space. The goal of this study is to understand how the level of detail of the CFD model affects its accuracy. Comparison of predictions with experimental data will be presented. 3. Understanding

14

Overall Efficiency Abstract-Computational fluid dynamics (C  

E-Print Network (OSTI)

to characterize the ef turbines. Efficiency is taken as the ratio of powe useful electricity) to total power lostOverall Efficiency Dept. of Abstract-Computational fluid dynamics (C have been completed from the u flow energy. Many tidal turbine developers ducted designs which accelerate the flow thro

Pedersen, Tom

15

COMPUTATIONAL FLUID DYNAMICS MODELING OF SOLID OXIDE FUEL CELLS  

E-Print Network (OSTI)

COMPUTATIONAL FLUID DYNAMICS MODELING OF SOLID OXIDE FUEL CELLS Ugur Pasaogullari and Chao-dimensional model has been developed to simulate solid oxide fuel cells (SOFC). The model fully couples current density operation. INTRODUCTION Solid oxide fuel cells (SOFC) are among possible candidates

16

Seventh International Conference on Computational Fluid Dynamics (ICCFD7),  

E-Print Network (OSTI)

industrial purpose CFD codes, such as TONUS [7], to investigate turbulent combustion flows. The main drawback-diffusive scheme, upwind downwind-controlled splitting 1 Introduction The use of Computational Fluids Dynamics (CFD: the reaction zone in a laminar deflagration at atmospheric condition can vary from about 1 mm to 10 mm

Boyer, Edmond

17

Nek5000: Computational Fluid Dynamics Code | Argonne National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Nek5000: Computational Fluid Dynamics Code Nek5000: Computational Fluid Dynamics Code Nuclear reactor simulation: An elevation plot of the highest energy neutron flux distributions from an axial slice of a nuclear reactor core is shown superimposed over the same slice of the underlying geometry. This figure shows the rapid spatial variation in the high energy neutron distribution between within each plate along with the more slowly varying, global distribution. The figure is significant since UNIC allows researchers to capture both of these effects simultaneously. Nuclear reactor simulation: An elevation plot of the highest energy neutron flux distributions from an axial slice of a nuclear reactor core is shown superimposed over the same slice of the underlying geometry. This figure shows the rapid spatial variation in the high energy neutron distribution

18

Method of determining interwell oil field fluid saturation distribution  

DOE Patents (OSTI)

A method of determining the oil and brine saturation distribution in an oil field by taking electrical current and potential measurements among a plurality of open-hole wells geometrically distributed throughout the oil field. Poisson's equation is utilized to develop fluid saturation distributions from the electrical current and potential measurement. Both signal generating equipment and chemical means are used to develop current flow among the several open-hole wells.

Donaldson, Erle C. (Bartlesville, OK); Sutterfield, F. Dexter (Bartlesville, OK)

1981-01-01T23:59:59.000Z

19

Flow modeling of flat oval ductwork elbows using computational fluid dynamics  

SciTech Connect

Incompressible turbulent flow fields in heating, ventilating, and air-conditioning (HVAC) elbows were computed using an incompressible, three-dimensional computational fluid dynamics (CFD) solver implementing a {kappa}-{epsilon} turbulence model. Two different geometries were investigated, including 90-degree five-gore hard-bend and easy-bend flat oval elbows. The geometries represent a subset of many configurations analyzed in ASHRAE RP-854, Determination of Duct Fitting Resistance by Numerical Analysis. For each configuration, the zero-length pressure loss coefficient was calculated. The flow was described through contours of velocity and plots of static pressure. The Reynolds number for these flows was held constant at 100,000 based on duct diameter and mean fluid velocity.

Mahank, T.A.; Mumma, S.A. [Pennsylvania State Univ., University Park, PA (United States)

1997-12-31T23:59:59.000Z

20

Computational thermal, chemical, fluid, and solid mechanics for geosystems management.  

SciTech Connect

This document summarizes research performed under the SNL LDRD entitled - Computational Mechanics for Geosystems Management to Support the Energy and Natural Resources Mission. The main accomplishment was development of a foundational SNL capability for computational thermal, chemical, fluid, and solid mechanics analysis of geosystems. The code was developed within the SNL Sierra software system. This report summarizes the capabilities of the simulation code and the supporting research and development conducted under this LDRD. The main goal of this project was the development of a foundational capability for coupled thermal, hydrological, mechanical, chemical (THMC) simulation of heterogeneous geosystems utilizing massively parallel processing. To solve these complex issues, this project integrated research in numerical mathematics and algorithms for chemically reactive multiphase systems with computer science research in adaptive coupled solution control and framework architecture. This report summarizes and demonstrates the capabilities that were developed together with the supporting research underlying the models. Key accomplishments are: (1) General capability for modeling nonisothermal, multiphase, multicomponent flow in heterogeneous porous geologic materials; (2) General capability to model multiphase reactive transport of species in heterogeneous porous media; (3) Constitutive models for describing real, general geomaterials under multiphase conditions utilizing laboratory data; (4) General capability to couple nonisothermal reactive flow with geomechanics (THMC); (5) Phase behavior thermodynamics for the CO2-H2O-NaCl system. General implementation enables modeling of other fluid mixtures. Adaptive look-up tables enable thermodynamic capability to other simulators; (6) Capability for statistical modeling of heterogeneity in geologic materials; and (7) Simulator utilizes unstructured grids on parallel processing computers.

Davison, Scott; Alger, Nicholas; Turner, Daniel Zack; Subia, Samuel Ramirez; Carnes, Brian; Martinez, Mario J.; Notz, Patrick K.; Klise, Katherine A.; Stone, Charles Michael; Field, Richard V., Jr.; Newell, Pania; Jove-Colon, Carlos F.; Red-Horse, John Robert; Bishop, Joseph E.; Dewers, Thomas A.; Hopkins, Polly L.; Mesh, Mikhail; Bean, James E.; Moffat, Harry K.; Yoon, Hongkyu

2011-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Direct determination of fluid-solid coexistence of square-well fluids confined in narrow cylindrical hard pores  

E-Print Network (OSTI)

-liquid coexistence, such as Gibbs ensemble Monte Carlo GEMC ,5 Gibbs­Duhem integration GDI ,6,7 grand- canonical the free energy calculation and GDI to determine the fluid-solid coexistence and the metastable fluid-volume-biased method in conjunction with GDI to develop the full vapor-solid, vapor-liquid, and liquid- solid phase

Singh, Jayant K.

22

Development of a Computational Fluid Dynamics Model for Combustion of Fast Pyrolysis Liquid (Bio-oil).  

E-Print Network (OSTI)

??A study was carried out into the computational fluid dynamic simulation of bio-oil combustion. Measurements were taken in an empirical burner to obtain information regarding (more)

McGrath, Arran Thomas

2011-01-01T23:59:59.000Z

23

Computational fluid dynamics modelling and experimental study on a single silica gel type B  

Science Journals Connector (OSTI)

The application of computational fluid dynamics (CFDs) in the area of porous media and adsorption cooling system is becoming more practical due to the significant improvement in computer power. The results from previous studies have shown that CFD can ...

John White

2012-01-01T23:59:59.000Z

24

Experimental methodology for computational fluid dynamics code validation  

SciTech Connect

Validation of Computational Fluid Dynamics (CFD) codes is an essential element of the code development process. Typically, CFD code validation is accomplished through comparison of computed results to previously published experimental data that were obtained for some other purpose, unrelated to code validation. As a result, it is a near certainty that not all of the information required by the code, particularly the boundary conditions, will be available. The common approach is therefore unsatisfactory, and a different method is required. This paper describes a methodology developed specifically for experimental validation of CFD codes. The methodology requires teamwork and cooperation between code developers and experimentalists throughout the validation process, and takes advantage of certain synergisms between CFD and experiment. The methodology employs a novel uncertainty analysis technique which helps to define the experimental plan for code validation wind tunnel experiments, and to distinguish between and quantify various types of experimental error. The methodology is demonstrated with an example of surface pressure measurements over a model of varying geometrical complexity in laminar, hypersonic, near perfect gas, 3-dimensional flow.

Aeschliman, D.P.; Oberkampf, W.L.

1997-09-01T23:59:59.000Z

25

Introduction to Computational Fluid Dynamics 424512 E #2Introduction to Computational Fluid Dynamics 424512 E #2 --rzrz IntroductionIntroduction toto ComputationalComputational Fluid DynamicsFluid DynamicsIntroductionIntroduction toto ComputationalComputa  

E-Print Network (OSTI)

transferExample: stationary heat transfer Stationary heat transfer, 2-D (Laplace eq'n): with a grid fluid flow (and heat,(and heat, massmass transfer)transfer) ((lecturelecture 4 of 5)4 of 5) Ron #2 -- rzrz Example: stationary heat transferExample: stationary heat transferExample: stationary heat

Zevenhoven, Ron

26

The Lattice Boltzmann Method For Computational Fluid Dynamics Applications.  

E-Print Network (OSTI)

??Dennis, Brian An analysis of lattice Boltzmann method is presented in this thesis. This analysis contrast with the traditional lattice Boltzmann work, where complex fluids (more)

Adhvaryu, Chinmay

2008-01-01T23:59:59.000Z

27

A computational fluid dynamics model for wind simulation: model implementation and experimental validation  

Science Journals Connector (OSTI)

To provide physically based wind modelling for wind erosion research at regional scale, a 3D computational fluid dynamics (CFD) wind model was developed. The model was programmed ... analysis and modelling tool (...

Zhuo-dong Zhang; Ralf Wieland; Matthias Reiche

2012-04-01T23:59:59.000Z

28

Computational fluid dynamics (CFD) simulations of aerosol in a u-shaped steam generator tube  

E-Print Network (OSTI)

as the physical model replicated for numerical simulation. Realizable k-? and standard k-? turbulence models were selected from the computational fluid dynamics (CFD) code, FLUENT, to provide the Eulerian description of the gaseous phase. Flow field simulation...

Longmire, Pamela

2009-05-15T23:59:59.000Z

29

Lattice-Boltzmann Simulations of Three-Dimensional Fluid Flow on a Desktop Computer  

Science Journals Connector (OSTI)

Lattice-Boltzmann Simulations of Three-Dimensional Fluid Flow on a Desktop Computer ... Algorithms for building lattices and solving the equations are not trivial, and memory demands are relatively high. ...

Jeffrey D. Brewster

2007-02-24T23:59:59.000Z

30

Developing an integrated building design tool by coupling building energy simulation and computational fluid dynamics programs  

E-Print Network (OSTI)

Building energy simulation (ES) and computational fluid dynamics (CFD) can play important roles in building design by providing essential information to help design energy-efficient, thermally comfortable and healthy ...

Zhai, Zhiqiang, 1971-

2003-01-01T23:59:59.000Z

31

Investigation into the discrepancies between computational fluid dynamics lift predictions and experimental results  

E-Print Network (OSTI)

An analysis of current computational fluid dynamics capabilities in predicting mean lift forces for two dimensional foils is conducted. It is shown that both integral boundary layer theory and Reynolds Averaged Navier ...

Fairman, Randall S. (Randall Scott), 1967-

2002-01-01T23:59:59.000Z

32

Lattice Boltzmann Method for Computational Fluid Li-Shi Luo1  

E-Print Network (OSTI)

Chapter 56 Lattice Boltzmann Method for Computational Fluid Dynamics Li-Shi Luo1 , Manfred Krafczyk of Michigan, Ann Arbor, MI, USA 1 Theory of The Lattice Boltzmann Equation 651 2 Applications in Computational OF THE LATTICE BOLTZMANN EQUATION The lattice Boltzmann equation (LBE) was proposed more than twenty years ago

Luo, Li-Shi

33

Computational fluid dynamics simulation of hydrodynamics and chemical reaction in a CFB downer  

Science Journals Connector (OSTI)

Abstract A computational fluid dynamics (CFD) model for simulating the chemical reaction process in a gasparticle circulating fluidized bed (CFB) downer is introduced by combining the two-fluid model (TFM) for the gasparticle turbulent flows and the c 2 ? ? c model for the turbulent mass transfer. With the proposed model, the species concentration and solid volume fraction as well as the velocity distributions along the CFB downer are able to be predicted. In mathematical expression of the proposed model, the recently developed formulations of c 2 ? ? c is adopted to close the turbulent mass transfer equations so that the turbulent mass diffusivity can be determined without relying on empirical methods. As for the gassolid two phase turbulent momentum transfer equations, the methodology of kg??g?kp??p?? is used for their closures. To validate the proposed model, simulation is carried out for the catalytic ozone decomposition in a gassolid CFB downer. The simulation results are compared with the experimental data and satisfactory agreement is found between them in both axial/radial distributions of concentration and solid volume fraction. Furthermore, the simulations reveal that the turbulent mass diffusivity varies along axial and radial directions, and the turbulent Schmidt number is not a constant throughout the CFB downer.

Wenbin Li; Kuotsung Yu; Botan Liu; Xigang Yuan

2015-01-01T23:59:59.000Z

34

Method and apparatus for simultaneous determination of fluid mass flow rate, mean velocity and density  

DOE Patents (OSTI)

This invention relates to a new method and new apparatus for determining fluid mass flowrate and density. In one aspect of the invention, the fluid is passed through a straight cantilevered tube in which transient oscillation has been induced, thus generating Coriolis damping forces on the tube. The decay rate and frequency of the resulting damped oscillation are measured, and the fluid mass flowrate and density are determined therefrom. In another aspect of the invention, the fluid is passed through the cantilevered tube while an electrically powered device imparts steady-state harmonic excitation to the tube. This generates Coriolis tube-damping forces which are dependent on the mass flowrate of the fluid. Means are provided to respond to incipient flow-induced changes in the amplitude of vibration by changing the power input to the excitation device as required to sustain the original amplitude of vibration. The fluid mass flowrate and density are determined from the required change in power input. The invention provides stable, rapid, and accurate measurements. It does not require bending of the fluid flow.

Hamel, William R. (Farragut, TN)

1984-01-01T23:59:59.000Z

35

2014-02-21 Issuance: Proposed Determination of Computer Servers...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

a Covered Consumer Product; Withdrawal 2014-02-21 Issuance: Proposed Determination of Computer Servers as a Covered Consumer Product; Withdrawal This document is a pre-publication...

36

Lattice Boltzmann computational fluid dynamics in three dimensions  

Science Journals Connector (OSTI)

The recent development of the lattice gas method and its extension to the lattice Boltzmann method have provided new computational schemes for ... In this paper, basic principles of a lattice Boltzmann computatio...

Shiyi Chen; Zheng Wang; Xiaowen Shan; Gary D. Doolen

1992-08-01T23:59:59.000Z

37

Experimental and Computational Study of Fluid Dynamics in Solar Reactor  

E-Print Network (OSTI)

The experimental simulation and a computational validation of a methane-cracking solar reactor powered by solar energy is the focus of this article. A solar cyclone reactor operates at over 1000 C where the methane decomposition reaction takes...

Chien, Min-Hsiu

2014-02-19T23:59:59.000Z

38

Determining Memory Use | Argonne Leadership Computing Facility  

NLE Websites -- All DOE Office Websites (Extended Search)

Allinea DDT Core File Settings Determining Memory Use Using VNC with a Debugger bgqstack gdb Coreprocessor TotalView on BGQ Systems Performance Tools & APIs Software & Libraries...

39

Computational Fluid Dynamics (CFD) simulations of dilute fluid-particle flows in aerosol concentrators  

E-Print Network (OSTI)

's turbulent dispersion model. A detailed literature survey revealed the inherent technical deficiencies in the model, even for particle dispersion. Based on the results of this study, it was determined that while the code can be used for simulating aerosol...

Hari, Sridhar

2005-02-17T23:59:59.000Z

40

Computational fluid dynamics combustion modelling--A comparison of secondary air system designs  

SciTech Connect

A newly developed computer simulation of the combustion process in a kraft recovery furnace uses computational fluid dynamics to model the processes of mass, momentum, and energy transport. This paper describes two models and a presentation of the flow fields obtained. The results predict a dramatic improvement in combustion behavior using a refined secondary air system with reduction in particulate carryover, enhanced operating temperatures, more uniform gas flow, and less carbon monoxide at the furnace exit.

Jones, A.K. (ABB Combustion Engineering Systems, Ottawa, Ontario (Canada)); Chapman, P.J. (ABB Combustion Engineering Systems, Windsor, CT (United States))

1993-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

validation and Enhancement of Computational Fluid Dynamics and Heat Transfer Predictive Capabilities for Generation IV Reactor Systems  

SciTech Connect

Nationwide, the demand for electricity due to population and industrial growth is on the rise. However, climate change and air quality issues raise serious questions about the wisdom of addressing these shortages through the construction of additional fossil fueled power plants. In 1997, the President's Committee of Advisors on Science and Technology Energy Research and Development Panel determined that restoring a viable nuclear energy option was essential and that the DOE should implement a R&D effort to address principal obstacles to achieving this option. This work has addressed the need for improved thermal/fluid analysis capabilities, through the use of computational fluid dynamics, which are necessary to support the design of generation IV gas-cooled and supercritical water reactors.

Robert E. Spall; Barton Smith; Thomas Hauser

2008-12-08T23:59:59.000Z

42

A Simple Interface to Computational Fluid Dynamics Programs for Building Environment Simulations  

E-Print Network (OSTI)

. SCI can be easily integrated into new CFD programs. Introduction Advanced building design requests and pressure distributions that are crucial for thermal comfort and building structure designs. TraditionallyA Simple Interface to Computational Fluid Dynamics Programs for Building Environment Simulations

Chen, Qingyan "Yan"

43

PREDICTION OF CUTTINGS BED HEIGHT WITH COMPUTATIONAL FLUID DYNAMICS IN DRILLING HORIZONTAL AND HIGHLY DEVIATED WELLS  

E-Print Network (OSTI)

Louisiana State University Abstract In oil well drilling, the efficient transport of drilled cuttings from pipe and excessive frictional pressure losses while drilling directional and horizontal oil wellsPREDICTION OF CUTTINGS BED HEIGHT WITH COMPUTATIONAL FLUID DYNAMICS IN DRILLING HORIZONTAL

Ullmer, Brygg

44

A Fully Conservative Ghost Fluid Method & Stiff Detonation Waves Computer Science Department  

E-Print Network (OSTI)

A Fully Conservative Ghost Fluid Method & Stiff Detonation Waves Duc Nguyen Computer Science applicable for tracking material interfaces, inert shocks, and both deflagration and detonation waves tracking inert shocks and detonation waves, so that is the focus of this paper. In particular, we address

Fedkiw, Ron

45

Two-Dimensional Computational Fluid Dynamics and Conduction Simulations of Heat Transfer in Window Frames  

E-Print Network (OSTI)

1 Two-Dimensional Computational Fluid Dynamics and Conduction Simulations of Heat Transfer Arasteh and Dragan Curcija ABSTRACT Accurately analyzing heat transfer in window frame cavities radiation heat-transfer effects.) We examine three representative complex cavity cross-section profiles

46

Computational fluid dynamic simulations of chemical looping fuel reactors utilizing gaseous fuels  

SciTech Connect

A computational fluid dynamic(CFD) model for the fuel reactor of chemical looping combustion technology has been developed,withspecialfocusonaccuratelyrepresentingtheheterogeneous chemicalreactions.Acontinuumtwo-fluidmodelwasusedtodescribeboththegasandsolidphases. Detailedsub-modelstoaccountforfluidparticleandparticleparticleinteractionforceswerealso incorporated.Twoexperimentalcaseswereanalyzedinthisstudy(Son andKim,2006; Mattisonetal., 2001). SimulationswerecarriedouttotestthecapabilityoftheCFDmodeltocapturechangesinoutletgas concentrationswithchangesinnumberofparameterssuchassuperficialvelocity,metaloxide concentration,reactortemperature,etc.Fortheexperimentsof Mattissonetal.(2001), detailedtime varyingoutletconcentrationvalueswerecompared,anditwasfoundthatCFDsimulationsprovideda reasonablematchwiththisdata.

Mahalatkar, K.; Kuhlman, J.; Huckaby, E.D.; O'Brien, T.

2011-01-01T23:59:59.000Z

47

Experimental Validation of a Computational Fluid Dynamics Model for IAQ applications in Ice Rink Arenas  

E-Print Network (OSTI)

1 Experimental Validation of a Computational Fluid Dynamics Model for IAQ applications in Ice Rink, USA, Fax: 617-432-4122, Abstract Many ice rink arenas have ice resurfacing equipment that uses fossil temperature distributions in ice rinks. The numerical results agree reasonably with the corresponding

Chen, Qingyan "Yan"

48

Fluid computation of the performanceenergy trade-off in large scale Markov models  

E-Print Network (OSTI)

total energy consumption should be chosen. H priority job SLA: 6.5s 90% L priority job SLA: 8s 80Fluid computation of the performance­energy trade-off in large scale Markov models Anton Stefanek to deal with is that of running costs such as energy consumption versus the availability and re- sponse

Imperial College, London

49

Computational Fluid Dynamics Simulation of Open-Channel Flows Over Bridge-Decks Under Various Flooding Conditions  

E-Print Network (OSTI)

. This study simulates limited scaled experimental data conducted elsewhere for bridge flooding in open channel simulation, Computational fluid dynamics, Flooding flows, Turbulence modeling, VOF modeling. 1. IntroductionComputational Fluid Dynamics Simulation of Open-Channel Flows Over Bridge-Decks Under Various

Kostic, Milivoje M.

50

Application of computational fluid dynamics (CFD) to nuclear applications.  

SciTech Connect

Detailed analysis of a quarter channel was performed using VIPRE and CFX. Results show that VIPRE and CFX agree closely in both cross-sectionally averaged axial temperature and cross-sectionally averaged axial velocity profiles. Detailed temperature distributions in the radial direction over 1mm from the clad surface towards the center of the channel were calculated using CFX, showing significant local variation. This information can be used for example, to determine if this temperature will lead to bubble nucleation. Quarter subassembly calculations were made with both VIPRE and STAR-CD. Comparison between the solutions show that the two codes yield very similar solutions under comparable conditions. However, the STAR-CD CFD calculation provides the analyst with much more detailed flow and temperature distributions than can be predicted by a one-dimensional code such as VIPRE. In addition, a 60 million cell one-eighth reactor core calculation was made using STAR-CD. This analysis showed the importance of accurately predicting the flow and temperature fields in all assemblies simultaneously with modern parallel processing technology, practical turnaround for these types of calculation can be obtained.

Brewster, R. A.; Jonnavithula, S.; Rizwan-Uddin; Rock, D. T.; Weber, D. P.; Wei, T. Y. C.

1999-02-08T23:59:59.000Z

51

Investigation of Swirling Flow in Rod Bundle Subchannels Using Computational Fluid Dynamics  

SciTech Connect

The fluid dynamics for turbulent flow through rod bundles representative of those used in pressurized water reactors is examined using computational fluid dynamics (CFD). The rod bundles of the pressurized water reactor examined in this study consist of a square array of parallel rods that are held on a constant pitch by support grids spaced axially along the rod bundle. Split-vane pair support grids are often used to create swirling flow in the rod bundle in an effort to improve the heat transfer characteristics for the rod bundle during both normal operating conditions and in accident condition scenarios. Computational fluid dynamics simulations for a two subchannel portion of the rod bundle were used to model the flow downstream of a split-vane pair support grid. A high quality computational mesh was used to investigate the choice of turbulence model appropriate for the complex swirling flow in the rod bundle subchannels. Results document a central swirling flow structure in each of the subchannels downstream of the split-vane pairs. Strong lateral flows along the surface of the rods, as well as impingement regions of lateral flow on the rods are documented. In addition, regions of lateral flow separation and low axial velocity are documented next to the rods. Results of the CFD are compared to experimental particle image velocimetry (PIV) measurements documenting the lateral flow structures downstream of the split-vane pairs. Good agreement is found between the computational simulation and experimental measurements for locations close to the support grid. (authors)

Holloway, Mary V. [United States Naval Academy, 117 Decatur Road, Annapolis, MD 21402-5018 (United States); Beasley, Donald E. [Clemson University, Clemson, S.C. 29634 (United States); Conner, Michael E. [Westinghouse Nuclear Fuel (United States)

2006-07-01T23:59:59.000Z

52

Demonstration of a Computational Fluid Dynamics (CFD) Tool Used for Data  

NLE Websites -- All DOE Office Websites (Extended Search)

Demonstration of a Computational Fluid Dynamics (CFD) Tool Used for Data Demonstration of a Computational Fluid Dynamics (CFD) Tool Used for Data Center Modeling, Thermal Analysis and Operational Management Speaker(s): Saket Karajgikar Date: November 11, 2010 - 12:00pm Location: 90-3122 Seminar Host/Point of Contact: Henry Coles Every Data Center built today is designed with a total capacity in mind, as well as a plan to grow into this final-day load. On a daily basis, Data Center Operations/Management professionals work toward keeping their Data Center as close to this plan as possible by concurrently managing the available power, space, cooling and airflow resources. Unfortunately, lack of communication and information, the pace of change and difficulty in coping with the ever growing power densities of IT equipment can prevent a

53

Pollutant Dispersion in a Large Indoor Space Part 2 -- Computational Fluid  

NLE Websites -- All DOE Office Websites (Extended Search)

Pollutant Dispersion in a Large Indoor Space Part 2 -- Computational Fluid Pollutant Dispersion in a Large Indoor Space Part 2 -- Computational Fluid Dyamics (CF) Predictions and Comparisons with a Model Experiment for Isothermal Flow Title Pollutant Dispersion in a Large Indoor Space Part 2 -- Computational Fluid Dyamics (CF) Predictions and Comparisons with a Model Experiment for Isothermal Flow Publication Type Journal Article Year of Publication 2004 Authors Finlayson, Elizabeth U., Ashok J. Gadgil, Tracy L. Thatcher, and Richard G. Sextro Journal Indoor Air Volume 14 Start Page Chapter Pagination 272-283 Abstract This paper reports on an investigation of the adequacy of Computational fluid dynamics (CFD), using a standard Reynolds Averaged Navier Stokes (RANS) model, for predicting dispersion of neutrally buoyant gas in a large indoor space. We used CFD to predict pollutant (dye) concentration profiles in a water filled scale model of an atrium with a continuous pollutant source. Predictions from the RANS formulation are comparable to an ensemble average of independent identical experiments. Model results were compared to pollutant concentration data in a horizontal plane from experiments in a scale model atrium. Predictions were made for steady-state (fully developed) and transient (developing) pollutant concentrations. Agreement between CFD predictions and ensemble averaged experimental measurements is quantified using the ratios of CFD-predicted and experimentally measured dye concentration at a large number of points in the measurement plane. Agreement is considered good if these ratios fall between 0.5 and 2.0 at all points in the plane. The standard k-epsilon two equation turbulence model obtains this level of agreement and predicts pollutant arrival time to the measurement plane within a few seconds. These results suggest that this modeling approach is adequate for predicting isothermal pollutant transport in a large room with simple geometry

54

Investigation of Coal-biomass Catalytic Gasification using Experiments, Reaction Kinetics, and Computational Fluid Dynamics  

NLE Websites -- All DOE Office Websites (Extended Search)

Coal-biomass Catalytic Coal-biomass Catalytic Gasification using Experiments, Reaction Kinetics, and Computational Fluid Dynamics Background The U.S. Department of Energy (DOE) supports research and development efforts targeted to improve efficiency and reduce the negative environmental effects of the use of fossil fuels. One way to achieve these goals is to combine coal with biomass to create synthesis gas (syngas) for use in turbines and refineries to produce energy, fuels,

55

National Ignition Facility computational fluid dynamics modeling and light fixture case studies  

SciTech Connect

This report serves as a guide to the use of computational fluid dynamics (CFD) as a design tool for the National Ignition Facility (NIF) program Title I and Title II design phases at Lawrence Livermore National Laboratory. In particular, this report provides general guidelines on the technical approach to performing and interpreting any and all CFD calculations. In addition, a complete CFD analysis is presented to illustrate these guidelines on a NIF-related thermal problem.

Martin, R.; Bernardin, J.; Parietti, L.; Dennison, B.

1998-02-01T23:59:59.000Z

56

MR-driven Computational Fluid Dynamics J-F. Nielsen1  

E-Print Network (OSTI)

MR-driven Computational Fluid Dynamics J-F. Nielsen1 , and K. S. Nayak2 1 Biomedical Engineering-encoding gradient pulse (VENC=1.6 m/s) was placed on the x, y, or z-gradient axis, or was turned off. MR-driven CFD component (vertical in Fig. 1) was incorporated into the MR-driven CFD solver. Hence, vx and vy were

Southern California, University of

57

Utilization of computational fluid dynamics technique in low NOx burner/furnace retrofits  

SciTech Connect

A computational fluid dynamics (CFD) technique has been utilized to provide design guidance for retrofitting low NOx combustion systems and incorporating associated furnace modifications into existing utility boilers. The CFD program utilized is FW-FIRES (Fossil fuel, Water-walled Furnace Integrated Reaction and Emission Simulation) which simulates furnace combustion, heat transfer and pollutant formation based on fundamental principals of mass, momentum and energy conservations. The program models the gas flow field as a three-dimensional turbulent reacting continuum and the particle flow as a series of discrete particle trajectories through the gas continuum. Chemical reaction, heat transfer, and pollutant formation mechanisms are incorporated in the program. FW-FIRES furnace simulation of low NOx combustion system retrofits has been performed for various furnace configurations including front wall-fired, front and real wall-fired, and tangentially-fired furnaces, to determine the effects of burner/furnace modifications on the NOx emission, furnace exit gas temperature, furnace heat absorption, unburned carbon, and furnace wall corrosion. For front wall-fired, and front and real wall-fired furnaces, the NOx emission requirement is met by the use of Foster Wheeler lox NOx burners and overfire air (OFA) staging. Studies of burner and OFA quantify and spacing are conducted to limit NOx emission and unburned carbon to acceptable levels. A major concern in once-through supercritical units with OFA is furnace wall corrosion which is caused by high furnace wall metal temperature and corrosive hydrogen sulfide (H{sub 2}S) created in a reducing atmosphere from part of coal sulfur. The FW-FIRES code is used to minimize this corrosion potential by selecting the proper location and quantity of boundary air. A simulation of tangentially-fired unit, which has been retrofitted with low NOx burners, is used to study the effect of the burner tilt on the furnace exit gas temperature. This paper details the basis and results of several CFD analyses conducted for potential retrofit programs.

Cho, S.M.; Seltzer, A.H.; Ma, J.; Steitz, T.H.; Grusha, J.; Cole, R.W.

1999-07-01T23:59:59.000Z

58

Approved Module Information for ME4501, 2014/5 Module Title/Name: Computational Fluid Dynamics and  

E-Print Network (OSTI)

-requisites: Thermodynamics and Fluids (ME3011). Engineering Mathematics 2 (AM21EM). Co-requisites: None Specified ModuleApproved Module Information for ME4501, 2014/5 Module Title/Name: Computational Fluid Dynamics and Applications Module Code: ME4501 School: Engineering and Applied Science Module Type: Standard Module New

Neirotti, Juan Pablo

59

Numerical model to determine the composition of H2ONaClCaCl2 fluid inclusions based on  

E-Print Network (OSTI)

Numerical model to determine the composition of H2O­NaCl­CaCl2 fluid inclusions based 2010 Abstract Natural fluids approximated by the H2O­NaCl­CaCl2 system are common in a wide range the compositions of fluid inclusions in the H2O­NaCl­CaCl2 sys- tem based on microthermometric and microanalytical

Bodnar, Robert J.

60

With faster processors and better numerical techniques, computational fluid dynamics (CFD) tools have revolutionized engineering design and optimization--  

E-Print Network (OSTI)

With faster processors and better numerical techniques, computational fluid dynamics (CFD) tools have revolutionized engineering design and optimization-- limiting expensive experimentation and Engineering Division (GED) at Southwest Research Institute® (SwRI®) has extensive experience and capabilities

Chapman, Clark R.

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

High-performance computing in computational fluid dynamics: progress and challenges  

Science Journals Connector (OSTI)

...data in the development of new modelling...industrial gas-turbine combustor...premium on the development of e cient...computing strategies. Larger DNS...GRID. In the development of LES the...industrial gas-turbine combustor...

2002-01-01T23:59:59.000Z

62

Optical position sensor for determining the interface between a clear and an opaque fluid  

DOE Patents (OSTI)

An inexpensive, optical position sensor for measuring a position or length, x, along a one-dimensional curvilinear, coordinate system. The sensor can be used, for example, to determine the position of an interface between a clear and an opaque fluid (such as crude oil and water). In one embodiment, the sensor utilizes the principle of dual-fluorescence, where a primary fiber emits primary fluorescent light and a parallel secondary fiber collects a portion of the primary fluorescent light that is not blocked by the opaque fluid. This, in turn, excites secondary fluorescence in the secondary fiber at a longer wavelength. A light detector measures the intensity of secondary fluorescence emitted from an end of the secondary fiber, which is used to calculate the unknown position or length, x. Side-emitting fibers can be used in place of, or in addition to, fluorescent fibers. The all-optical sensor is attractive for applications involving flammable liquids.

Weiss, Jonathan D. (Albuquerque, NM)

2006-05-23T23:59:59.000Z

63

On the application of computational fluid dynamics codes for liquefied natural gas dispersion.  

SciTech Connect

Computational fluid dynamics (CFD) codes are increasingly being used in the liquefied natural gas (LNG) industry to predict natural gas dispersion distances. This paper addresses several issues regarding the use of CFD for LNG dispersion such as specification of the domain, grid, boundary and initial conditions. A description of the k-{var_epsilon} model is presented, along with modifications required for atmospheric flows. Validation issues pertaining to the experimental data from the Burro, Coyote, and Falcon series of LNG dispersion experiments are also discussed. A description of the atmosphere is provided as well as discussion on the inclusion of the Coriolis force to model very large LNG spills.

Luketa-Hanlin, Anay Josephine; Koopman, Ronald P. (Lawrence Livermore National Laboratory, Livermore, CA); Ermak, Donald (Lawrence Livermore National Laboratory, Livermore, CA)

2006-02-01T23:59:59.000Z

64

Computational Fluid Dynamics of a Semi Batch Reactor for Heavy Oil Hydroconversion  

Science Journals Connector (OSTI)

This work presents the numerical results of the computational fluid dynamics of a semi batch reactor used for hydroconversion of heavy oil. The reactor is a multicomponent system and it is modeled as a pseudo two phase system ( gas + slurry ). The equations used are the continuity equations the momentum equation (Navier?Stokes) and the k?? for turbulence. The numerical method used to solve the mathematical method was the finite volume where the problem was divided in two domains in order to account for the moving part of the impeller. The numerical results indicated convergence of the procedure for the velocity profiles.

T. S. Yamada; R. Guirardello

2009-01-01T23:59:59.000Z

65

Design strategy for a Chemical Looping Combustion system using process simulation and Computational Fluid Dynamics  

Science Journals Connector (OSTI)

A strategy for design and optimisation of chemical processes involving multiple fluidised bed reactors is presented through a combination of standard design calculations, process simulation and Computational Fluid Dynamics (CFD). The strategy is demonstrated in designing a Chemical Looping Combustion (CLC) process that generates 12.5 kW of heat in the air reactor. The resulting design strategy will allow for very economical investigations into various design and optimisation considerations. It also offers a platform from which to conduct virtual prototyping investigations for new process concepts, which will lead to significant economic benefits when compared with a traditional experimental process development strategy.

Schalk Cloete; Shahriar Amini

2012-01-01T23:59:59.000Z

66

COMPUTATIONAL FLUID DYNAMICS MODELING OF SCALED HANFORD DOUBLE SHELL TANK MIXING - CFD MODELING SENSITIVITY STUDY RESULTS  

SciTech Connect

The primary purpose of the tank mixing and sampling demonstration program is to mitigate the technical risks associated with the ability of the Hanford tank farm delivery and celtification systems to measure and deliver a uniformly mixed high-level waste (HLW) feed to the Waste Treatment and Immobilization Plant (WTP) Uniform feed to the WTP is a requirement of 24590-WTP-ICD-MG-01-019, ICD-19 - Interface Control Document for Waste Feed, although the exact definition of uniform is evolving in this context. Computational Fluid Dynamics (CFD) modeling has been used to assist in evaluating scaleup issues, study operational parameters, and predict mixing performance at full-scale.

JACKSON VL

2011-08-31T23:59:59.000Z

67

Visualization of the recovery-bioler flow fields predicted by computational fluid dynamics  

SciTech Connect

Flow patterns in the kraft recovery furnace can be simulated using models based on computational fluid dynamics (CFD). The use of CFD is becoming increasingly common as computer workstations become more powerful and CFD software is improved. In this article, the authors present simulated results for flow fields in the lower furnace. Because the flows in the lower furnace are dominated by the air system, the authors chose to simulate flow fields under isothermal conditions. The predicted flow fields were used to supplement results obtained from physical modeling. When a physical model is used for testing, each air-system configuration is typically evaluated based on air and gas velocities and the mixing distribution as measured at a limited number of test planes. Such measurements are commonly used to quantitatively assess air-system configurations for modeling studies or to validate CFD models.

Chapman, P.J.; Janik, S.G. (Kreisinger Development Lab. ABB Combustion Engineering Systems, Windsor, CT (United States)); Jones, A.K. (ABB Canada, Ottawa, ON (Canada))

1992-03-01T23:59:59.000Z

68

Computational Procedures for Determining Parameters in Ramberg-Osgood  

Office of Scientific and Technical Information (OSTI)

Computational Procedures for Determining Parameters in Ramberg-Osgood Computational Procedures for Determining Parameters in Ramberg-Osgood Elastoplastic Model Based on Modulus and Damping Versus Strain Tzou-Shin Ueng Jian-Chu Chen July, 1992 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency Thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or

69

Three-dimensional Computational Fluid Dynamics (CFD) modeling of dry spent nuclear fuel storage canisters  

SciTech Connect

One of the interim storage configurations being considered for aluminum-clad foreign research reactor fuel, such as the Material and Testing Reactor (MTR) design, is in a dry storage facility. To support design studies of storage options, a computational and experimental program was conducted at the Savannah River Site (SRS). The objective was to develop computational fluid dynamics (CFD) models which would be benchmarked using data obtained from a full scale heat transfer experiment conducted in the SRS Experimental Thermal Fluids Laboratory. The current work documents the CFD approach and presents comparison of results with experimental data. CFDS-FLOW3D (version 3.3) CFD code has been used to model the 3-dimensional convective velocity and temperature distributions within a single dry storage canister of MTR fuel elements. For the present analysis, the Boussinesq approximation was used for the consideration of buoyancy-driven natural convection. Comparison of the CFD code can be used to predict reasonably accurate flow and thermal behavior of a typical foreign research reactor fuel stored in a dry storage facility.

Lee, S.Y.

1997-06-01T23:59:59.000Z

70

Unit physics performance of a mix model in Eulerian fluid computations  

SciTech Connect

In this report, we evaluate the performance of a K-L drag-buoyancy mix model, described in a reference study by Dimonte-Tipton [1] hereafter denoted as [D-T]. The model was implemented in an Eulerian multi-material AMR code, and the results are discussed here for a series of unit physics tests. The tests were chosen to calibrate the model coefficients against empirical data, principally from RT (Rayleigh-Taylor) and RM (Richtmyer-Meshkov) experiments, and the present results are compared to experiments and to results reported in [D-T]. Results show the Eulerian implementation of the mix model agrees well with expectations for test problems in which there is no convective flow of the mass averaged fluid, i.e., in RT mix or in the decay of homogeneous isotropic turbulence (HIT). In RM shock-driven mix, the mix layer moves through the Eulerian computational grid, and there are differences with the previous results computed in a Lagrange frame [D-T]. The differences are attributed to the mass averaged fluid motion and examined in detail. Shock and re-shock mix are not well matched simultaneously. Results are also presented and discussed regarding model sensitivity to coefficient values and to initial conditions (IC), grid convergence, and the generation of atomically mixed volume fractions.

Vold, Erik [Los Alamos National Laboratory; Douglass, Rod [Los Alamos National Laboratory

2011-01-25T23:59:59.000Z

71

The Importance of Rheology in the Determination of the Carrying Capacity of Oil-Drilling Fluids  

Science Journals Connector (OSTI)

The ability of a drilling fluid to convey drill cuttings from a well is not fully ... cuttings travel with a lower velocity than the drilling fluid and they can accumulate in the ... lead to degradation of the cu...

M. A. Lockyer; J. M. Davies; T. E. R. Jones

1980-01-01T23:59:59.000Z

72

Determination of fluid viscosities from biconical annular geometries: Experimental and modeling studies  

E-Print Network (OSTI)

to measure the viscosity of a fluid at downhole conditions. The design investigated in this study addresses several limitations encountered in previous designs. The prototype was calibrated and tested with fluids with viscosities ranging from 1 to 28 cp under...

Rondon, Nolys Javier

2009-05-15T23:59:59.000Z

73

Computational Fluid Dynamic Analysis of the VHTR Lower Plenum Standard Problem  

SciTech Connect

The United States Department of Energy is promoting the resurgence of nuclear power in the U. S. for both electrical power generation and production of process heat required for industrial processes such as the manufacture of hydrogen for use as a fuel in automobiles. The DOE project is called the next generation nuclear plant (NGNP) and is based on a Generation IV reactor concept called the very high temperature reactor (VHTR), which will use helium as the coolant at temperatures ranging from 450 C to perhaps 1000 C. While computational fluid dynamics (CFD) has not been used for past safety analysis for nuclear reactors in the U. S., it is being considered for safety analysis for existing and future reactors. It is fully recognized that CFD simulation codes will have to be validated for flow physics reasonably close to actual fluid dynamic conditions expected in normal and accident operational situations. To this end, experimental data have been obtained in a scaled model of a narrow slice of the lower plenum of a prismatic VHTR. The present report presents results of CFD examinations of these data to explore potential issues with the geometry, the initial conditions, the flow dynamics and the data needed to fully specify the inlet and boundary conditions; results for several turbulence models are examined. Issues are addressed and recommendations about the data are made.

Richard W. Johnson; Richard R. Schultz

2009-07-01T23:59:59.000Z

74

Technical Review of the CENWP Computational Fluid Dynamics Model of the John Day Dam Forebay  

SciTech Connect

The US Army Corps of Engineers Portland District (CENWP) has developed a computational fluid dynamics (CFD) model of the John Day forebay on the Columbia River to aid in the development and design of alternatives to improve juvenile salmon passage at the John Day Project. At the request of CENWP, Pacific Northwest National Laboratory (PNNL) Hydrology Group has conducted a technical review of CENWP's CFD model run in CFD solver software, STAR-CD. PNNL has extensive experience developing and applying 3D CFD models run in STAR-CD for Columbia River hydroelectric projects. The John Day forebay model developed by CENWP is adequately configured and validated. The model is ready for use simulating forebay hydraulics for structural and operational alternatives. The approach and method are sound, however CENWP has identified some improvements that need to be made for future models and for modifications to this existing model.

Rakowski, Cynthia L.; Serkowski, John A.; Richmond, Marshall C.

2010-12-01T23:59:59.000Z

75

Computational Fluid Dynamics (CFD) Modeling for High Rate Pulverized Coal Injection (PCI) into the Blast Furnace  

SciTech Connect

Pulverized coal injection (PCI) into the blast furnace (BF) has been recognized as an effective way to decrease the coke and total energy consumption along with minimization of environmental impacts. However, increasing the amount of coal injected into the BF is currently limited by the lack of knowledge of some issues related to the process. It is therefore important to understand the complex physical and chemical phenomena in the PCI process. Due to the difficulty in attaining trus BF measurements, Computational fluid dynamics (CFD) modeling has been identified as a useful technology to provide such knowledge. CFD simulation is powerful for providing detailed information on flow properties and performing parametric studies for process design and optimization. In this project, comprehensive 3-D CFD models have been developed to simulate the PCI process under actual furnace conditions. These models provide raceway size and flow property distributions. The results have provided guidance for optimizing the PCI process.

Dr. Chenn Zhou

2008-10-15T23:59:59.000Z

76

Determination of several variables affecting laboratory measurements of cross-linked fracture fluids  

E-Print Network (OSTI)

SHEAR RATE o) PSEUDOPLASTIC NEWTONIAN SHEAR RATE b) Figure 3 ? Fluid Flow Behavior shear rate. These fluids are also called shear-thinning fluids. The power law (Ostwald-dewaele) model is the most popular model used to describe the flow behavior...

Wilson, Matilda Jane

1982-01-01T23:59:59.000Z

77

Technology of Computational Fluid Dynamics in space engines and solar-gravity draught power plants  

Science Journals Connector (OSTI)

Non-isentropic discontinuous, unsteady flows with energy addition or extraction, during ignition of solid propellant rocket motors or tall solar towers heating transients are approached through a wave front method, initially developed by Zannetti for isentropic flows in aerodynamics. Its application in discontinuous flows with zones of different behaviour and energy extraction proves highly efficient. Computational efficiency is demonstrated by Computational Fluid Dynamics simulation of the starting transients in ADDA Solid Rocket Engines (SRE) and in the SEATTLER solar mirror tower. The code is exclusively directed to unsteady flow simulations in slender channels. The wave front model scheme covers the dual behaviour of fully non-isentropic flow with mass addition and mixing in the thrust chamber or blunt heat addition in a heater and fully isentropic through the exhaust nozzle or gravity draught in a tall tower. Along the tower of the solar-gravity draught power plants, small perturbation discontinuous flows are covered. Code robustness is demonstrated during runs on the PC. The 1D numerical scheme is based on the resolution of gasdynamic discontinuities within the enhanced method of Zannetti.

Radu Dan Rugescu

2008-01-01T23:59:59.000Z

78

Performance of a municipal solid waste (MSW) incinerator predicted with a computational fluid dynamics (CFD) code  

SciTech Connect

The purpose of this paper is to investigate by the means of numerical simulation the performance of the MSW incinerator with of Vercelli (Italy). FLUENT, a finite-volumes commercial code for Fluid Dynamics has been used to predict the 3-D reacting flows (gaseous phase) within the incinerator geometry, in order to estimate if the three conditions settled by the Italian law (P.D. 915 / 82) are respected: (a) Flue gas temperature at the input of the secondary combustion chamber must exceed 950 C. (b) Oxygen concentration in the same section must exceed 6 %. (c) Residence time for the flue gas in the secondary combustion chamber must exceed 2 seconds. The model of the incinerator has been created using the software pre-processing facilities (wall, input, outlet and live cells), together with the set-up of boundary conditions. There are also imposed the combustion constants (stoichiometry, heat of combustion, air excess). The solving procedure transforms at the level of each live cell the partial derivative equations in algebraic equations, computing the velocities field, the temperatures, gases concentration, etc. These predicted values were compared with the design properties, and the conclusion was that the conditions (a), (b), (c), are respected in normal operation. The powerful graphic interface helps the user to visualize the magnitude of the computed parameters. These results may be successfully used for the design and operation improvements for MSW incinerators. This fact will substantially increase the efficiency, reduce pollutant emissions and optimize the plant overall performance.

Anglesio, P.; Negreanu, G.P.

1998-07-01T23:59:59.000Z

79

Three-Dimensional Computational Fluid Dynamics Modeling of Solid Oxide Electrolysis Cells and Stacks  

SciTech Connect

A three-dimensional computational fluid dynamics (CFD) electrochemical model has been created for detailed analysis of a high-temperature electrolysis stack (solid oxide fuel cells operated as electrolyzers). Inlet and outlet plenum flow distributions are discussed. Maldistribution of plena flow show deviations in per-cell operating conditions due to non-uniformity of species concentrations. Models have also been created to simulate experimental conditions and for code validation. Comparisons between model predictions and experimental results are discussed. Mass, momentum, energy, and species conservation and transport are provided via the core features of the commercial CFD code FLUENT. A solid-oxide fuel cell (SOFC) model adds the electrochemical reactions and loss mechanisms and computation of the electric field throughout the cell. The FLUENT SOFC user-defined subroutine was modified for this work to allow for operation in the electrolysis mode. Model results provide detailed profiles of temperature, Nernst potential, operating potential, activation over-potential, anode-side gas composition, cathode-side gas composition, current density and hydrogen production over a range of stack operating conditions. Variations in flow distribution, and species concentration are discussed. End effects of flow and per-cell voltage are also considered. Predicted mean outlet hydrogen and steam concentrations vary linearly with current density, as expected. Contour plots of local electrolyte temperature, current density, and Nernst potential indicate the effects of heat transfer, reaction cooling/heating, and change in local gas composition.

Grant Hawkes; James O'Brien; Carl Stoots; Stephen Herring

2008-07-01T23:59:59.000Z

80

Method and apparatus for determining distribution of fluids in a porous sample  

SciTech Connect

Apparatus for use in expelling fluid from a porous sample is described. It consists of: a chamber adapted to receive a porous sample having an arcuate outer extremity the curvature of which substantially corresponds to the arc of a circle; means connecting the chamber to a rotatable shaft mounted substantially on the center of curvature of the arcuate outer extremity of the chamber; means for rotating the shaft, whereby the spinning of a fluid-saturated porous sample contained in the chamber will expel fluid from the sample; and means for capturing fluid expelled from the sample.

Christiansen, R.L.

1989-04-04T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Determining circulating fluid temperature in drilling, workover, and well-control operations  

SciTech Connect

Estimation of fluid temperature in both flow conduits (drillpipe or tubing and the annulus) is required to ascertain the fluid density and viscosity and, in turn, to calculate the pressure drop or the maximum allowable pumping rate for a number of operations. These operations include drilling, workover, and well control. The fluid temperature estimation becomes critical for high-temperature or geothermal reservoirs where significant heat exchange occurs or when fluid properties are temperature sensitive, such as for a non-Newtonian fluid. In this work, the authors present an analytical model for the flowing fluid temperature in the drillpipe/tubing and in the annulus as a function of well depth and circulation time. The model is based on an energy balance between the formation and the fluid in the drillpipe.tubing and annulus. Steady-state heat transfer is assumed in the wellbore while transient heat transfer takes place in the formation. solutions are obtained for two possible scenarios: (1) the fluid flows down the annulus and up the drillpipe/tubing, and (2) the fluid flows down the tubing and up the annulus. The analytic model developed is cast in a set of simple algebraic equations for rapid implementation. The authors also show that the maximum temperature occurs not at the well bottom, but at some distance higher from the bottom for flow up the annulus.

Kabir, C.S. [Chevron Overseas Petroleum Technology Co. (Kuwait); Hasan, A.R.; Ameen, M.M. [Univ. of North Dakota, Grand Forks, ND (United States); Kouba, G.E.

1996-06-01T23:59:59.000Z

82

DETERMINING EMPLOYEE EXPOSURE TO ETHYLENE GLYCOL WHILE PERFORMING MAINTENANCE ON AN AIRCRAFT DEICING FLUID COLLECTION SYSTEM.  

E-Print Network (OSTI)

??Air monitoring was performed on an aircraft deicing fluid collection system at the Cincinnati/Northern Kentucky International Airport (CNKIA). The goal of the study was to (more)

CHAPMAN, DONALD RIVERS

2007-01-01T23:59:59.000Z

83

Computational fluid dynamics study of wind turbine blade profiles at low Reynolds numbers for various angles of attack  

Science Journals Connector (OSTI)

Airfoil data are rarely available for Angles Of Attack (AOA) over the entire range of 180. This is unfortunate for the wind turbine designers because wind turbine airfoils do operate over this entire range. In this paper an attempt is made to study the lift and drag forces on a wind turbine blade at various sections and the effect of angle of attack on these forces. Aerodynamic simulations of the steady flow past two-dimensional wind-turbine blade-profiles developed by the National Renewable Energy Laboratory (NREL) at low Reynolds number will be performed. The aerodynamic simulation will be performed using Computational Fluid Dynamics (CFD) techniques. The governing equations used in the simulations are the Reynolds-Average-Navier-Stokes (RANS) equations. The simulations at different wind speeds will be performed on the S809 and the S826 blade profiles. The S826 blade profile is considered in this study because it is the most suitable blade profile for the wind conditions in Egypt in the site of Gulf El-Zayt on the red sea. Lift and drag forces along with the angle of attack are the important parameters in a wind turbine system. These parameters determine the efficiency of the wind turbine. The lift and drag forces are computed over the entire range of AOA of 180 at low Reynolds numbers. The results of the analysis showed that the AOA between 3 and 8 have high Lift/Drag ratio regardless of the wind speed and the blade profile. The numerical results are compared with wind tunnel measurements at the available limited range of the angle of attack. In addition the numerical results are compared with the results obtained from the equations developed by Viterna and Janetzke for deep stall. The comparisons showed that the used CFD code can accurately predict the aerodynamic loads on the wind-turbine blades.

2012-01-01T23:59:59.000Z

84

A proposed methodology for computational fluid dynamics code verification, calibration, and validation  

SciTech Connect

Verification, calibration, and validation (VCV) of Computational Fluid Dynamics (CFD) codes is an essential element of the code development process. The exact manner in which code VCV activities are planned and conducted, however, is critically important. It is suggested that the way in which code validation, in particular, is often conducted--by comparison to published experimental data obtained for other purposes--is in general difficult and unsatisfactory, and that a different approach is required. This paper describes a proposed methodology for CFD code VCV that meets the technical requirements and is philosophically consistent with code development needs. The proposed methodology stresses teamwork and cooperation between code developers and experimentalists throughout the VCV process, and takes advantage of certain synergisms between CFD and experiment. A novel approach to uncertainty analysis is described which can both distinguish between and quantify various types of experimental error, and whose attributes are used to help define an appropriate experimental design for code VCV experiments. The methodology is demonstrated with an example of laminar, hypersonic, near perfect gas, 3-dimensional flow over a sliced sphere/cone of varying geometrical complexity.

Aeschliman, D.P.; Oberkampf, W.L.; Blottner, F.G.

1995-07-01T23:59:59.000Z

85

A proposed framework for computational fluid dynamics code calibration/validation  

SciTech Connect

The paper reviews the terminology and methodology that have been introduced during the last several years for building confidence n the predictions from Computational Fluid Dynamics (CID) codes. Code validation terminology developed for nuclear reactor analyses and aerospace applications is reviewed and evaluated. Currently used terminology such as ``calibrated code,`` ``validated code,`` and a ``validation experiment`` is discussed along with the shortcomings and criticisms of these terms. A new framework is proposed for building confidence in CFD code predictions that overcomes some of the difficulties of past procedures and delineates the causes of uncertainty in CFD predictions. Building on previous work, new definitions of code verification and calibration are proposed. These definitions provide more specific requirements for the knowledge level of the flow physics involved and the solution accuracy of the given partial differential equations. As part of the proposed framework, categories are also proposed for flow physics research, flow modeling research, and the application of numerical predictions. The contributions of physical experiments, analytical solutions, and other numerical solutions are discussed, showing that each should be designed to achieve a distinctively separate purpose in building confidence in accuracy of CFD predictions. A number of examples are given for each approach to suggest methods for obtaining the highest value for CFD code quality assurance.

Oberkampf, W.L.

1993-12-31T23:59:59.000Z

86

Dynamic stall analysis of horizontal-axis-wind-turbine blades using computational fluid dynamics  

Science Journals Connector (OSTI)

Dynamic stall has been widely known to significantly affect the performance of the wind turbines. In this paper aerodynamic simulation of the unsteady low-speed flow past two-dimensional wind turbine blade profiles developed by the National Renewable Energy Laboratory (NREL) will be performed. The aerodynamic simulation will be performed using Computational Fluid Dynamics (CFD). The governing equations used in the simulations are the Unsteady-Reynolds-Averaged-Navier-Stokes (URANS) equations. The unsteady separated turbulent flow around an oscillating airfoil pitching in a sinusoidal pattern in the regime of low Reynolds number is investigated numerically. The investigation employs the URANS approach with the most suitable turbulence model. The development of the light dynamic stall of the blades under consideration is studied. The S809 blade profile is simulated at different mean wind speeds. Moreover the S826 blade profile is also considered for analysis of wind turbine blade which is the most suitable blade profile for the wind conditions in Egypt over the site of Gulf of El-Zayt. In order to find the best oscillating frequency different oscillating frequencies are studied. The best frequency can then be used for the blade pitch controller. The comparisons with the experimental results showed that the used CFD code can accurately predict the blade profile unsteady aerodynamic loads.

2012-01-01T23:59:59.000Z

87

Unit physics testing of a mix model in an eulerian fluid computation  

SciTech Connect

A K-L turbulence mix model driven with a drag-buoyancy source term is tested in an Eulerian code in a series of basic unit-physics tests, as part of a mix validation milestone. The model and the closure coefficient values are derived in the work of Dimonte-Tipton [D-T] in Phys.Flu.18, 085101 (2006), and many of the test problems were reported there, where the mix model operated in Lagrange computations. The drag-buoyancy K-L mix model was implemented within the Eulerian code framework by A.J. Scannapieco. Mix model performance is evaluated in terms of mix width growth rates compared to experiments in select regimes. Results in our Eulerian code are presented for several unit-physics I-D test problems including the decay of homogeneous isotropic turbulence (HIT), Rayleigh-Taylor (RT) unstable mixing, shock amplification of initial turbulence, Richtmyer-Meshkov (RM) mixing in several single shock test cases and in comparison to two RM experiments including re-shock (Vetter-Sturtevant and Poggi, et.al.). Sensitivity to model parameters, to Atwood number, and to initial conditions are examined. Results here are in good agreement in some tests (HIT, RT) with the previous results reported for the mix model in the Lagrange calculations. The HIT turbulent decay agrees closely with analytic expectations, and the RT growth rate matches experimental values for the default values of the model coefficients proposed in [D-T]. Results for RM characterized with a power law growth rate differ from the previous mix model work but are still within the range for reasonable agreement with experiments. Sensitivity to IC values in the RM studies are examined; results are sensitive to initial values of L[t=O], which largely determines the RM mix layer growth rate, and generally differs from the IC values used in the RT studies. Result sensitivity to initial turbulence, K[t=O], is seen to be small but significant above a threshold value. Initial conditions can be adjusted so that single shock RM mix width results match experiments but we have not been able to obtain a good match for first shock and re-shock growth rates in the same experiment with a single set of parameters and Ie. Problematic issues with KH test problems are described. Resolution studies for an RM test problem show the K-L mix growth rate decreases as it converges at a supra-linear rate, and, convergence requires a fine grid (on the order of 10 microns). For comparison, a resolution study of a second mix model [Scannapieco and Cheng, Phys.Lett.A, 299(1),49, (2002)] acting on a two fluid interface problem was examined. The mix in this case was found to increase with grid resolution at low to moderate resolutions, but converged at comparably fine resolutions. In conclusion, these tests indicate that the Eulerian code K-L model, using the Dimonte Tipton default model closure coefficients, achieve reasonable results across many of the unit-physics experimental conditions. However, we were unable to obtain good matches simultaneously for shock and re-shock mix in a single experiment. Results are sensitive to initial conditions in the regimes under study, with different IC best suited to RT or RM mix. It is reasonable to expect IC sensitivity in extrapolating to high energy density regimes, or to experiments with deceleration due to arbitrary combinations of RT and RM. As a final comparison, the atomically generated mix fraction and the mix width were each compared for the K-L mix model and the Scannapieco model on an identical RM test problem. The Scannapieco mix fraction and width grow linearly. The K-L mix fraction and width grow with the same power law exponent, in contrast to expectations from analysis. In future work it is proposed to do more head-to-head comparisons between these two models and other mix model options on a full suite of physics test problems, such as interfacial deceleration due to pressure build-up during an idealized ICF implosion.

Vold, Erik [Los Alamos National Laboratory; Douglass, Rod [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

88

Computational Fluid Dynamics Analysis of Very High Temperature Gas-Cooled Reactor Cavity Cooling System  

SciTech Connect

The design of passive heat removal systems is one of the main concerns for the modular very high temperature gas-cooled reactors (VHTR) vessel cavity. The reactor cavity cooling system (RCCS) is a key heat removal system during normal and off-normal conditions. The design and validation of the RCCS is necessary to demonstrate that VHTRs can survive to the postulated accidents. The computational fluid dynamics (CFD) STAR-CCM+/V3.06.006 code was used for three-dimensional system modeling and analysis of the RCCS. A CFD model was developed to analyze heat exchange in the RCCS. The model incorporates a 180-deg section resembling the VHTR RCCS experimentally reproduced in a laboratory-scale test facility at Texas A&M University. All the key features of the experimental facility were taken into account during the numerical simulations. The objective of the present work was to benchmark CFD tools against experimental data addressing the behavior of the RCCS following accident conditions. Two cooling fluids (i.e., water and air) were considered to test the capability of maintaining the RCCS concrete walls' temperature below design limits. Different temperature profiles at the reactor pressure vessel (RPV) wall obtained from the experimental facility were used as boundary conditions in the numerical analyses to simulate VHTR transient evolution during accident scenarios. Mesh convergence was achieved with an intensive parametric study of the two different cooling configurations and selected boundary conditions. To test the effect of turbulence modeling on the RCCS heat exchange, predictions using several different turbulence models and near-wall treatments were evaluated and compared. The comparison among the different turbulence models analyzed showed satisfactory agreement for the temperature distribution inside the RCCS cavity medium and at the standpipes walls. For such a complicated geometry and flow conditions, the tested turbulence models demonstrated that the realizable k-epsilon model with two-layer all y+ wall treatment performs better than the other k-epsilon and k-omega turbulence models when compared to the experimental results and the Reynolds stress transport turbulence model results. A scaling analysis was developed to address the distortions introduced by the CFD model in simulating the physical phenomena inside the RCCS system with respect to the full plant configuration. The scaling analysis demonstrated that both the experimental facility and the CFD model achieve a satisfactory resemblance of the main flow characteristics inside the RCCS cavity region, and convection and radiation heat exchange phenomena are properly scaled from the actual plant.

Angelo Frisani; Yassin A. Hassan; Victor M. Ugaz

2010-11-02T23:59:59.000Z

89

Computation of fluid circulation in a cryogenic storage tank and heat transfer analysis during jet impingement.  

E-Print Network (OSTI)

??The study presents a systematic single and two-phase analysis of fluid flow and heat transfer in a liquid hydrogen storage vessel for both earth and (more)

Mukka, Santosh Kumar

2005-01-01T23:59:59.000Z

90

The determination of glucose in sonophoretically extracted interstitial fluid and the characterization of ultrasound parameters  

E-Print Network (OSTI)

chamber and used to correlate ultrasound spectral properties to the amount of fluid extracted. Results indicate that the highest amount of water extracted occurs when the acoustic coupling media on the surface of the skin is cavitating, resulting in mild...

Cantrell, Jeffrey Travis

2012-06-07T23:59:59.000Z

91

Experimental and Computational Studies of Fluid Flow Phenomena in Carbon Dioxide Sequestration in Brine and Oil Fields  

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EXPERIMENTAL AND COMPUTATIONAL STUDIES OF FLUID EXPERIMENTAL AND COMPUTATIONAL STUDIES OF FLUID FLOW PHENOMENA IN CARBON DIOXIDE SEQUESTRATION IN BRINE AND OIL FIELDS Chuang Ji ( chuang.ji@netl.doe.gov ) National Energy Technology Laboratory Department of Energy, Morgantown, WV 26507-0880 BOX 5725 Clarkson University Potsdam, NY 13699 Goodarz Ahmadi ( ahmadi@clarkson.edu ) BOX 5725 Clarkson University Potsdam, NY 13699 Duane H. Smith ( duane.smith@netl.doe.gov ) National Energy Technology Laboratory Department of Energy, Morgantown, WV 26507-0880 2 INTRODUCTION Sequestration of CO 2 by injection into deep geological formations is a method to reduce CO 2 emissions into the atmosphere. However, when CO 2 is injected underground, it forms fingers extending into the rock pores saturated with brine or petroleum. This flow

92

Computer simulation models relevant to ground water contamination from EOR or other fluids - state-of-the-art  

SciTech Connect

Ground water contamination is a serious national problem. The use of computers to simulate the behavior of fluids in the subsurface has proliferated extensively over the last decade. Numerical models are being used to solve water supply problems, various kinds of enertgy production problems, and ground water contamination problems. Modeling techniques have progressed to the point that their accuracy is only limited by the modeller's ability to describe the reservoir in question and the heterogeneities therein. Pursuant to the Task and Milestone Update of Project BE3A, this report summarizes the state of the art of computer simulation models relevant to contamination of ground water by enhanced oil recovery (EOR) chemicals and/or waste fluids. 150 refs., 6 tabs.

Kayser, M.B.; Collins, A.G.

1986-03-01T23:59:59.000Z

93

3D Computational Fluid Dynamics Simulation of Natural Coke Steam Gasification in General and Improved Fluidized Beds  

Science Journals Connector (OSTI)

The thermal characteristics of natural coke steam gasification in a fluidized bed were three-dimensionally (3D) simulated based on the computational fluid dynamics (CFD) method using Fluent code. ... However, this technology seems difficult to carry out due to its abradability, hard ignition, hot burst, and so on. ... In short, all the results in this work have a significance to provide the theoretical basis for the design, operational optimization, and scale-up of the natural coke steam gasification process. ...

Ya-li Tang; Dai-jun Liu; Yu-hong Liu; Qian Luo

2010-09-30T23:59:59.000Z

94

CFD [computational fluid dynamics] And Safety Factors. Computer modeling of complex processes needs old-fashioned experiments to stay in touch with reality.  

SciTech Connect

Computational fluid dynamics (CFD) is recognized as a powerful engineering tool. That is, CFD has advanced over the years to the point where it can now give us deep insight into the analysis of very complex processes. There is a danger, though, that an engineer can place too much confidence in a simulation. If a user is not careful, it is easy to believe that if you plug in the numbers, the answer comes out, and you are done. This assumption can lead to significant errors. As we discovered in the course of a study on behalf of the Department of Energy's Savannah River Site in South Carolina, CFD models fail to capture some of the large variations inherent in complex processes. These variations, or scatter, in experimental data emerge from physical tests and are inadequately captured or expressed by calculated mean values for a process. This anomaly between experiment and theory can lead to serious errors in engineering analysis and design unless a correction factor, or safety factor, is experimentally validated. For this study, blending times for the mixing of salt solutions in large storage tanks were the process of concern under investigation. This study focused on the blending processes needed to mix salt solutions to ensure homogeneity within waste tanks, where homogeneity is required to control radioactivity levels during subsequent processing. Two of the requirements for this task were to determine the minimum number of submerged, centrifugal pumps required to blend the salt mixtures in a full-scale tank in half a day or less, and to recommend reasonable blending times to achieve nearly homogeneous salt mixtures. A full-scale, low-flow pump with a total discharge flow rate of 500 to 800 gpm was recommended with two opposing 2.27-inch diameter nozzles. To make this recommendation, both experimental and CFD modeling were performed. Lab researchers found that, although CFD provided good estimates of an average blending time, experimental blending times varied significantly from the average.

Leishear, Robert A.; Lee, Si Y.; Poirier, Michael R.; Steeper, Timothy J.; Ervin, Robert C.; Giddings, Billy J.; Stefanko, David B.; Harp, Keith D.; Fowley, Mark D.; Van Pelt, William B.

2012-10-07T23:59:59.000Z

95

2014-03-26 Issuance: Proposed Determination of Computer and Battery...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

26 Issuance: Proposed Determination of Computer and Battery Backup Systems as a Covered Consumer Product; Extension of Public Comment Period 2014-03-26 Issuance: Proposed...

96

2014-02-21 Issuance: Proposed Determination of Computer and Battery...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Systems as a Covered Consumer Product 2014-02-21 Issuance: Proposed Determination of Computer and Battery Backup Systems as a Covered Consumer Product This document is a...

97

Optimization of a high-efficiency jet ejector by computational fluid dynamic software  

E-Print Network (OSTI)

large nozzle diameter ratio. Dimensionless group analysis reveals that the research results are valid for any fluid, operating pressure, and geometric scale for a given motive-stream Mach number and Reynolds ratio between the motive and propelled streams...

Watanawanavet, Somsak

2005-08-29T23:59:59.000Z

98

Development and Verification of a Computational Fluid Dynamics Model of a Horizontal-Axis Tidal Current Turbine  

SciTech Connect

This paper describes the development of a computational fluid dynamics (CFD) methodology to simulate the hydrodynamics of horizontal-axis tidal current turbines. Qualitative measures of the CFD solutions were independent of the grid resolution. Conversely, quantitative comparisons of the results indicated that the use of coarse computational grids results in an under prediction of the hydrodynamic forces on the turbine blade in comparison to the forces predicted using more resolved grids. For the turbine operating conditions considered in this study, the effect of the computational timestep on the CFD solution was found to be minimal, and the results from steady and transient simulations were in good agreement. Additionally, the CFD results were compared to corresponding blade element momentum method calculations and reasonable agreement was shown. Nevertheless, we expect that for other turbine operating conditions, where the flow over the blade is separated, transient simulations will be required.

Lawson, M. J.; Li, Y.; Sale, D. C.

2011-10-01T23:59:59.000Z

99

Determining the Terminal Velocity and the Particle Size of Epoxy Based Fluids in the Wellbore  

E-Print Network (OSTI)

(Bosma et al. 1998) .............................................................................. 5 Figure 2.2 Epoxy flooded formations under microscope (Nguyen et al. 2004) .... 6 Figure 2.3 Epoxy used for remedial casing procedure (Ng 1994... exceeds 350. All these wells need to be plugged prior to abandoning. This thesis is part of a project funded by BSEE which investigates the applicability of epoxy based or other non-cement plugging fluid to plug hurricane damaged wells...

Turkmenoglu, Hasan

2012-10-19T23:59:59.000Z

100

Description of interfaces of fluid-tethered chains: advances in density functional theories and off-lattice computer simulations  

E-Print Network (OSTI)

Many objects of nanoscopic dimensions involve fluid-tethered chain interfaces. These systems are of interest for basic science and for several applications, in particular for design of nanodevices for specific purposes. We review recent developments of theoretical methods in this area of research and in particular of density functional (DF) approaches, which provide important insights into microscopic properties of such interfaces. The theories permit to describe the dependence of adsorption, wettability, solvation forces and electric interfacial phenomena on thermodynamic states and on characteristics of tethered chains. Computer simulations for the problems in question are overviewed as well. Theoretical results are discussed in relation to simulation results and to some experimental observations.

S. Soko?owski; J. Ilnytskyi; O. Pizio

2014-03-06T23:59:59.000Z

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101

Computational Fluid Dynamics Simulations of Raw Gas Composition from a Black Liquor GasifierComparison with Experiments  

Science Journals Connector (OSTI)

Computational Fluid Dynamics Simulations of Raw Gas Composition from a Black Liquor GasifierComparison with Experiments ... The black liquor spray was represented by 1003 discrete particles having a fitted Rosin Rammler distribution of power 2 and a characteristic size of 200 ?m. ... Additional PFR calculations were performed using different inlet gas compositions with similar results (not presented here), i.e. the Jones and Lindstedt model showed a significantly higher reformation rate of methane than GRI-Mech at gasification conditions in the medium temperature range (1150 < T < 1500 K). ...

Per Carlsson; Kristiina Iisa; Rikard Gebart

2011-07-05T23:59:59.000Z

102

An Adaptive Cartesian Detonation Solver for Fluid-Structure Interaction Simulation on Distributed Memory Computers  

E-Print Network (OSTI)

An Adaptive Cartesian Detonation Solver for Fluid-Structure Interaction Simulation on Distributed shock and detonation waves impinging on deforming solid structures benefit significantly from) for studying the three- dimensional dynamic response of solid materials subject to strong shock and detonation

103

Coupled computational fluid dynamics and heat transfer analysis of the VHTR lower plenum.  

SciTech Connect

The very high temperature reactor (VHTR) concept is being developed by the US Department of Energy (DOE) and other groups around the world for the future generation of electricity at high thermal efficiency (> 48%) and co-generation of hydrogen and process heat. This Generation-IV reactor would operate at elevated exit temperatures of 1,000-1,273 K, and the fueled core would be cooled by forced convection helium gas. For the prismatic-core VHTR, which is the focus of this analysis, the velocity of the hot helium flow exiting the core into the lower plenum (LP) could be 35-70 m/s. The impingement of the resulting gas jets onto the adiabatic plate at the bottom of the LP could develop hot spots and thermal stratification and inadequate mixing of the gas exiting the vessel to the turbo-machinery for energy conversion. The complex flow field in the LP is further complicated by the presence of large cylindrical graphite posts that support the massive core and inner and outer graphite reflectors. Because there are approximately 276 channels in the VHTR core from which helium exits into the LP and a total of 155 support posts, the flow field in the LP includes cross flow, multiple jet flow interaction, flow stagnation zones, vortex interaction, vortex shedding, entrainment, large variation in Reynolds number (Re), recirculation, and mixing enhancement and suppression regions. For such a complex flow field, experimental results at operating conditions are not currently available. Instead, the objective of this paper is to numerically simulate the flow field in the LP of a prismatic core VHTR using the Sandia National Laboratories Fuego, which is a 3D, massively parallel generalized computational fluid dynamics (CFD) code with numerous turbulence and buoyancy models and simulation capabilities for complex gas flow fields, with and without thermal effects. The code predictions for simpler flow fields of single and swirling gas jets, with and without a cross flow, are validated using reported experimental data and theory. The key processes in the LP are identified using phenomena identification and ranking table (PIRT). It may be argued that a CFD code that accurately simulates simplified, single-effect flow fields with increasing complexity is likely to adequately model the complex flow field in the VHTR LP, subject to a future experimental validation. The PIRT process and spatial and temporal discretizations implemented in the present analysis using Fuego established confidence in the validation and verification (V and V) calculations and in the conclusions reached based on the simulation results. The performed calculations included the helicoid vortex swirl model, the dynamic Smagorinsky large eddy simulation (LES) turbulence model, participating media radiation (PMR), and 1D conjugate heat transfer (CHT). The full-scale, half-symmetry LP mesh used in the LP simulation included unstructured hexahedral elements and accounted for the graphite posts, the helium jets, the exterior walls, and the bottom plate with an adiabatic outer surface. Results indicated significant enhancements in heat transfer, flow mixing, and entrainment in the VHTR LP when using swirling inserts at the exit of the helium flow channels into the LP. The impact of using various swirl angles on the flow mixing and heat transfer in the LP is qualified, including the formation of the central recirculation zone (CRZ), and the effect of LP height. Results also showed that in addition to the enhanced mixing, the swirling inserts result in negligible additional pressure losses and are likely to eliminate the formation of hot spots.

El-Genk, Mohamed S. (University of New Mexico, Albuquerque, NM); Rodriguez, Salvador B.

2010-12-01T23:59:59.000Z

104

Development and testing of a standard procedure for determining the viscous properties of crosslinked fracture fluids  

E-Print Network (OSTI)

of the shear rate at the bob by use of the Kr ieger correction. During the develop- ment of the testing pr ocedur e, it was discover ed that the gel experienced shear degradation when subjected to an incr easing shear rate. Therefore, the shear rate should... always be decreased when measuring these fluids. The applicability of the testing procedure was verified by test- ing gel systems supplied by four service companies with gel concentrations of 0. 48$ and 0. 72$ HPG (40 and 60 Ib/1000 gal, respectively...

Worlow, David Wayne

1987-01-01T23:59:59.000Z

105

Computer simulation of effective viscosity of fluid-proppant mixture used in hydraulic fracturing  

E-Print Network (OSTI)

The paper presents results of numerical experiments performed to evaluate the effective viscosity of a fluid-proppant mixture, used in hydraulic fracturing. The results, obtained by two complimenting methods (the particle dynamics and the smoothed particle hydrodynamics), coincide to the accuracy of standard deviation. They provide an analytical equation for the dependence of effective viscosity on the proppant concentration, needed for numerical simulation of the hydraulic fracture propagation.

Kuzkin, Vitaly A; Linkov, Aleksandr M

2013-01-01T23:59:59.000Z

106

Large-scale lattice Boltzmann simulations of complex fluids: advances through the advent of computational Grids  

Science Journals Connector (OSTI)

...into a computational Grid, which in turn permits...Coveney 2003) which use hybrid algorithms have shown...tractable toolkits for the Grid: a plea for lightweight...C KesselmanIn The Grid: blueprint for a new computing infrastructure 1999San Francisco...

2005-01-01T23:59:59.000Z

107

Massively parallel computational fluid dynamics calculations for aerodynamics and aerothermodynamics applications  

SciTech Connect

Massively parallel computers have enabled the analyst to solve complicated flow fields (turbulent, chemically reacting) that were previously intractable. Calculations are presented using a massively parallel CFD code called SACCARA (Sandia Advanced Code for Compressible Aerothermodynamics Research and Analysis) currently under development at Sandia National Laboratories as part of the Department of Energy (DOE) Accelerated Strategic Computing Initiative (ASCI). Computations were made on a generic reentry vehicle in a hypersonic flowfield utilizing three different distributed parallel computers to assess the parallel efficiency of the code with increasing numbers of processors. The parallel efficiencies for the SACCARA code will be presented for cases using 1, 150, 100 and 500 processors. Computations were also made on a subsonic/transonic vehicle using both 236 and 521 processors on a grid containing approximately 14.7 million grid points. Ongoing and future plans to implement a parallel overset grid capability and couple SACCARA with other mechanics codes in a massively parallel environment are discussed.

Payne, J.L.; Hassan, B.

1998-09-01T23:59:59.000Z

108

2014-02-21 Issuance: Proposed Determination of Computer Servers as a Covered Consumer Product; Withdrawal  

Energy.gov (U.S. Department of Energy (DOE))

This document is a pre-publication Federal Register notice withdrawing the previously proposed determination that computer servers qualify as a covered product, as issued by the Deputy Assistant Secretary for Energy Efficiency on February 21, 2014.

109

Computing leakage current distributions and determination of minimum leakage vectors for combinational designs  

E-Print Network (OSTI)

approach to determine and implicitly represent the leakage value for all input vectors of a combinational circuit is presented. In its exact form, this technique can compute the leakage value of each input vector, by storing these leakage values implicitly...

Gulati, Kanupriya

2006-08-16T23:59:59.000Z

110

Powertrain control strategy determination for computer-controlled transmissions  

Science Journals Connector (OSTI)

An analytical method has been developed for determining the optimal power-train control strategy (engine calibration and shift strategy) on a second-by-second basis through a user specified drive cycle. The optimisation process is subject not only to emission constraints, but also permits the introduction of transmission dynamics and driveability considerations, such as shift frequency, as further operating constraints. With the inclusion of new constraints in the program, the fuel economy projection, the shift strategy, and therefore, the engine speed/road trajectory and the engine calibration are automatically altered by the simulation to reflect the impact of the imposed constraints. The methodology can be applied to both discrete ratio and continuously variable transmissions. In this paper, the optimisation algorithm is detailed and a graphical technique is described for deriving vehicle implementable shift strategies from the optimum. The effects on shift strategy and fuel economy of variation of driveability and emission constraints are also illustrated.

D.M. Kuzak; B.D. Shields; R.J. Freedman; J.J. Lee; D.L. Rittmueller

1987-01-01T23:59:59.000Z

111

Modeling of gas-solid flow in a CFB riser based on computational particle fluid dynamics  

Science Journals Connector (OSTI)

A three-dimensional model for gas-solid flow in a circulating fluidized bed (CFB) riser was developed based on computational particle ... experimental data validated the CPFD model for the CFB riser. The model pr...

Yinghui Zhang; Xingying Lan; Jinsen Gao

2012-12-01T23:59:59.000Z

112

Preliminary Evaluation of High-Performance Fortran as a Language for Computational Fluid Dynamics  

E-Print Network (OSTI)

the development of a new simulation and design environment, which takes fulladvantageof recent advances in Introduction Aerospace industry interest in hardware and software for parallel computing has heightened recently, driven by a variety of complementary factors. Contributing factors include: successes

Hawick, Ken

113

Simulations for Complex Fluid Flow Problems from Berkeley Lab's Center for Computational Sciences and Engineering (CCSE)  

DOE Data Explorer (OSTI)

The Center for Computational Sciences and Engineering (CCSE) develops and applies advanced computational methodologies to solve large-scale scientific and engineering problems arising in the Department of Energy (DOE) mission areas involving energy, environmental, and industrial technology. The primary focus is in the application of structured-grid finite difference methods on adaptive grid hierarchies for compressible, incompressible, and low Mach number flows. The diverse range of scientific applications that drive the research typically involve a large range of spatial and temporal scales (e.g. turbulent reacting flows) and require the use of extremely large computing hardware, such as the 153,000-core computer, Hopper, at NERSC. The CCSE approach to these problems centers on the development and application of advanced algorithms that exploit known separations in scale; for many of the application areas this results in algorithms are several orders of magnitude more efficient than traditional simulation approaches.

114

Globally Distributed Engineering Teams in Computational Fluid Dynamics and in Product Development  

E-Print Network (OSTI)

, experimental research on idea generation methods used in globally distributed teams during the conceptual design phase of the product development process is presented. An experimental study simulating the global distribution of a three person Computational...

Schmidt, Susanne R.

2010-10-12T23:59:59.000Z

115

Determination of Thermal-Degradation Rates of Some Candidate Rankine-Cycle Organic Working Fluids for Conversion of Industrial Waste Heat Into Power  

E-Print Network (OSTI)

DETERMINATION OF THERMAL-DEGRADATION RATES OF SOME CANDIDATE RANKINE-CYCLE ORGANIC WORKING FLUIDS FOR CONVERSION OF INDUSTRIAL WASTE HEAT INTO POWER Mohan L. Jain, Jack Demirgian, John L. Krazinski, and H. Bushby Argonne National Laboratory..., Argonne, Illinois Howard Mattes and John Purcell U.S. Department of Energy ABSTRACT Serious concerns over the long-term thermal In a previous study [1] based on systems stability of organic working fluids and its effect analysis and covering...

Jain, M. L.; Demirgian, J.; Krazinski, J. L.; Bushby, H.; Mattes, H.; Purcell, J.

1984-01-01T23:59:59.000Z

116

Method, system and computer program product for monitoring and optimizing fluid extraction from geologic strata  

DOE Patents (OSTI)

An arrangement which utilizes an inexpensive flap valve/flow transducer combination and a simple local supervisory control system to monitor and/or control the operation of a positive displacement pump used to extract petroleum from geologic strata. The local supervisory control system controls the operation of an electric motor which drives a reciprocating positive displacement pump so as to maximize the volume of petroleum extracted from the well per pump stroke while minimizing electricity usage and pump-off situations. By reducing the electrical demand and pump-off (i.e., "pounding" or "fluid pound") occurrences, operating and maintenance costs should be reduced sufficiently to allow petroleum recovery from marginally productive petroleum fields. The local supervisory control system includes one or more applications to at least collect flow signal data generated during operation of the positive displacement pump. No flow, low flow and flow duration are easily evaluated using the flap valve/flow transducer arrangement.

Medizade, Masoud (San Luis Obispo, CA); Ridgely, John Robert (Los Osos, CA)

2009-12-15T23:59:59.000Z

117

Development and Verification of a Computational Fluid Dynamics Model of a Horizontal-Axis Tidal Current Turbine  

NLE Websites -- All DOE Office Websites (Extended Search)

Development and Verification of Development and Verification of a Computational Fluid Dynamics Model of a Horizontal-Axis Tidal Current Turbine M.J. Lawson and Y. Li. National Renewable Energy Laboratory D.C. Sale University of Washington Presented at the 30 th International Conference on Ocean, Offshore, and Arctic Engineering Rotterdam, The Netherlands June 19-24, 2011 NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency & Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. Conference Paper NREL/CP-5000-50981 October 2011 Contract No. DE-AC36-08GO28308 NOTICE The submitted manuscript has been offered by an employee of the Alliance for Sustainable Energy, LLC (Alliance), a contractor of the US Government under Contract No. DE-AC36-08GO28308. Accordingly, the US

118

Development and Validation of the 3-D Computational Fluid Dynamics Model for CANDU-6 Moderator Temperature Predictions  

SciTech Connect

A computational fluid dynamics (CFD) model for predicting the moderator circulation inside the Canada deuterium uranium (CANDU) reactor vessel has been developed to estimate the local subcooling of the moderator in the vicinity of the Calandria tubes. The buoyancy effect induced by internal heating is accounted for by Boussinesq approximation. The standard k-[curly epsilon] turbulence model associated with logarithmic wall treatment is applied to predict the turbulent jet flows from the inlet nozzles. The matrix of the Calandria tubes in the core region is simplified to porous media, in which anisotropic hydraulic impedance is modeled using an empirical correlation of the frictional pressure loss. The governing equations are solved by CFX-4.4, a commercial CFD code developed by AEA Technology. The CFD model has been successfully verified and validated against experimental data obtained at Stern Laboratories Inc. in Hamilton, Ontario, Canada.

Yoon, Churl; Rhee, Bo Wook; Min, Byung-Joo [Korea Atomic Energy Research Institute (Korea, Republic of)

2004-12-15T23:59:59.000Z

119

Development of one-dimensional computational fluid dynamics code 'GFLOW' for groundwater flow and contaminant transport analysis  

SciTech Connect

Prediction of groundwater movement and contaminant transport in soil is an important problem in many branches of science and engineering. This includes groundwater hydrology, environmental engineering, soil science, agricultural engineering and also nuclear engineering. Specifically, in nuclear engineering it is applicable in the design of spent fuel storage pools and waste management sites in the nuclear power plants. Ground water modeling involves the simulation of flow and contaminant transport by groundwater flow. In the context of contaminated soil and groundwater system, numerical simulations are typically used to demonstrate compliance with regulatory standard. A one-dimensional Computational Fluid Dynamics code GFLOW had been developed based on the Finite Difference Method for simulating groundwater flow and contaminant transport through saturated and unsaturated soil. The code is validated with the analytical model and the benchmarking cases available in the literature. (authors)

Rahatgaonkar, P. S.; Datta, D.; Malhotra, P. K.; Ghadge, S. G. [Nuclear Power Corporation of India Ltd., R-2, Ent. Block, Nabhikiya Urja Bhavan, Anushakti Nagar, Mumbai - 400 094 (India)

2012-07-01T23:59:59.000Z

120

Liquefied Natural Gas (LNG) Vapor Dispersion Modeling with Computational Fluid Dynamics Codes  

E-Print Network (OSTI)

Federal regulation 49 CFR 193 and standard NFPA 59A require the use of validated consequence models to determine the vapor cloud dispersion exclusion zones for accidental liquefied natural gas (LNG) releases. For modeling purposes, the physical...

Qi, Ruifeng

2012-10-19T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Accuracy characteristics of traditional finite volume discretizations for unsteady computational fluid dynamics  

SciTech Connect

Recently Manson et al. demonstrated the shortcoming of traditional finite volume approaches, typified by Patankar`s SIMPLE algorithm, for discretizing the equations of fluid flow, heat transfer, and associated transport processes. They were able to show for one severe test case-low spatial resolution and zero diffusion that traditional finite volume approaches are ineffective for unsteady state problems with significant convective effects. They are ineffective because there exists a time step limitation, even for implicit methods, which is imposed by accuracy constraints rather than stability constraints. The objective of the present paper is to show that the poor performance of these methods in that paper was not simply due to the severity of the test case. This paper will demonstrate the same inadequacy prevails for a range of spatial resolutions and non-zero diffusion cases. This knowledge is already documented but its significance still seems to elude the CFD community who persist with traditional discretizations for unsteady advection. 7 refs., 5 figs.

Manson, J.R. [Bucknell Univ., Lewisburg, PA (United States)] [Bucknell Univ., Lewisburg, PA (United States); Wallis, S.G. [Heriot-Watt Univ., Edinburgh (United Kingdom)] [Heriot-Watt Univ., Edinburgh (United Kingdom)

1997-03-15T23:59:59.000Z

122

Advanced Computational Thermal Fluid Physics (CTFP) and Its Assessment for Light Water Reactors and Supercritical Reactors  

SciTech Connect

Background: The ultimate goal of the study is the improvement of predictive methods for safety analyses and design of Generation IV reactor systems such as supercritical water reactors (SCWR) for higher efficiency, improved performance and operation, design simplification, enhanced safety and reduced waste and cost. The objective of this Korean / US / laboratory / university collaboration of coupled fundamental computational and experimental studies is to develop the supporting knowledge needed for improved predictive techniques for use in the technology development of Generation IV reactor concepts and their passive safety systems. The present study emphasizes SCWR concepts in the Generation IV program.

D.M. McEligot; K. G. Condie; G. E. McCreery; H. M. McIlroy; R. J. Pink; L.E. Hochreiter; J.D. Jackson; R.H. Pletcher; B.L. Smith; P. Vukoslavcevic; J.M. Wallace; J.Y. Yoo; J.S. Lee; S.T. Ro; S.O. Park

2005-10-01T23:59:59.000Z

123

Computational Fluid Dynamics Evaluation of Good Combustion Performance in Waste Incinerators  

E-Print Network (OSTI)

a legal requirement to minimize pollution in municipal solid waste incinerators. The conditions for in-furnace destruction of pollutants are stated as: good combustion is achieved when 2-second gas residence time at 850 C of potential pollutants. The residence time needs to be carefully determined based on the gas inlet position

Kim, Yong Jung

124

Mathematical modelling approach for determining optimal machining parameters in turning with computer numerical control (CNC) machines  

Science Journals Connector (OSTI)

Due to advancement in the manufacturing technology the application of computer numerical control (CNC) machines have increased manifolds. The determination of machining parameters for optimal results in machining is a part of computer aided process planning. In computer numerical control (CNC) machining, determining optimum or appropriate cutting parameters can minimise machining errors such as tool breakage, tool deflection and tool wear, thus yielding a high productivity or minimum cost. Different mathematical models have been proposed by various researchers in the past for the determination of optimal machining parameters. The present paper attempt's to review the literature regarding 'machining parameter optimisation' for turning operation in CNC machines. Diverse contributing and important factors in mathematical modelling like, the economic criteria's, single and multi-pass turning, optimisation techniques and practical constraints deployed have been considered. A detailed discussion is presented regarding the topic and in the end conclusions are drawn.

Bhaskar Naithani; Santram Chauhan

2012-01-01T23:59:59.000Z

125

Two-Dimensional Computational Fluid Dynamics and Conduction Simulations of Heat Transfer in Horizontal Window Frames with Internal Cavities  

SciTech Connect

This paper assesses the accuracy of the simplified frame cavity conduction/convection and radiation models presented in ISO 15099 and used in software for rating and labeling window products. Temperatures and U-factors for typical horizontal window frames with internal cavities are compared; results from Computational Fluid Dynamics (CFD) simulations with detailed radiation modeling are used as a reference. Four different frames were studied. Two were made of polyvinyl chloride (PVC) and two of aluminum. For each frame, six different simulations were performed, two with a CFD code and four with a building-component thermal-simulation tool using the Finite Element Method (FEM). This FEM tool addresses convection using correlations from ISO 15099; it addressed radiation with either correlations from ISO 15099 or with a detailed, view-factor-based radiation model. Calculations were performed using the CFD code with and without fluid flow in the window frame cavities; the calculations without fluid flow were performed to verify that the CFD code and the building-component thermal-simulation tool produced consistent results. With the FEM-code, the practice of subdividing small frame cavities was examined, in some cases not subdividing, in some cases subdividing cavities with interconnections smaller than five millimeters (mm) (ISO 15099) and in some cases subdividing cavities with interconnections smaller than seven mm (a breakpoint that has been suggested in other studies). For the various frames, the calculated U-factors were found to be quite comparable (the maximum difference between the reference CFD simulation and the other simulations was found to be 13.2 percent). A maximum difference of 8.5 percent was found between the CFD simulation and the FEM simulation using ISO 15099 procedures. The ISO 15099 correlation works best for frames with high U-factors. For more efficient frames, the relative differences among various simulations are larger. Temperature was also compared, at selected locations on the frames. Small differences was found in the results from model to model. Finally, the effectiveness of the ISO cavity radiation algorithms was examined by comparing results from these algorithms to detailed radiation calculations (from both programs). Our results suggest that improvements in cavity heat transfer calculations can be obtained by using detailed radiation modeling (i.e. view-factor or ray-tracing models), and that incorporation of these strategies may be more important for improving the accuracy of results than the use of CFD modeling for horizontal cavities.

Gustavsen, Arlid; Kohler, Christian; Dalehaug, Arvid; Arasteh, Dariush

2008-12-01T23:59:59.000Z

126

Multisoliton solutions in terms of double Wronskian determinant for a generalized variable-coefficient nonlinear Schroedinger equation from plasma physics, arterial mechanics, fluid dynamics and optical communications  

SciTech Connect

In this paper, the multisoliton solutions in terms of double Wronskian determinant are presented for a generalized variable-coefficient nonlinear Schroedinger equation, which appears in space and laboratory plasmas, arterial mechanics, fluid dynamics, optical communications and so on. By means of the particularly nice properties of Wronskian determinant, the solutions are testified through direct substitution into the bilinear equations. Furthermore, it can be proved that the bilinear Baecklund transformation transforms between (N - 1)- and N-soliton solutions.

Lue Xing [School of Science, P.O. Box 122, Beijing University of Posts and Telecommunications, Beijing 100876 (China)], E-mail: xinglv655@yahoo.com.cn; Zhu Hongwu; Yao Zhenzhi; Meng Xianghua; Zhang Cheng [School of Science, P.O. Box 122, Beijing University of Posts and Telecommunications, Beijing 100876 (China); Zhang Chunyi [Ministry-of-Education Key Laboratory of Fluid Mechanics and National Laboratory for Computational Fluid Dynamics, Beijing University of Aeronautics and Astronautics, Beijing 100083 (China); Meteorology Center of Air Force Command Post, Changchun 130051 (China); Tian Bo [School of Science, P.O. Box 122, Beijing University of Posts and Telecommunications, Beijing 100876 (China); State Key Laboratory of Software Development Environment, Beijing University of Aeronautics and Astronautics, Beijing 100083 (China); Key Laboratory of Optical Communication and Lightwave Technologies, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876 (China)], E-mail: gaoyt@public.bta.net.cn

2008-08-15T23:59:59.000Z

127

An Experimental Design Approach to the Optimization of Supercritical Fluid Extraction for the Determination of Oil and Grease in Soil  

Science Journals Connector (OSTI)

......Smith, B.W. Wright, and C.R. Yonker. Supercritical fluid...1323A-36A(1988). 9. J.R. Wheeler and M.E. McNally. Supercritical fluid extraction...11. F.H. Walters, L.R. Parker, Jr., S.L. Morgan, and S.N......

M.K.L. Bicking; T.G. Hayes; J.C. Kiley; S.N. Deming

1993-05-01T23:59:59.000Z

128

Computational fluid dynamics modeling of chemical looping combustion process with calcium sulphate oxygen carrier - article no. A19  

SciTech Connect

To concentrate CO{sub 2} in combustion processes by efficient and energy-saving ways is a first and very important step for its sequestration. Chemical looping combustion (CLC) could easily achieve this goal. A chemical-looping combustion system consists of a fuel reactor and an air reactor. Two reactors in the form of interconnected fluidized beds are used in the process: (1) a fuel reactor where the oxygen carrier is reduced by reaction with the fuel, and (2) an air reactor where the reduced oxygen carrier from the fuel reactor is oxidized with air. The outlet gas from the fuel reactor consists of CO{sub 2} and H{sub 2}O, while the outlet gas stream from the air reactor contains only N{sub 2} and some unused O{sub 2}. The water in combustion products can be easily removed by condensation and pure carbon dioxide is obtained without any loss of energy for separation. Until now, there is little literature about mathematical modeling of chemical-looping combustion using the computational fluid dynamics (CFD) approach. In this work, the reaction kinetic model of the fuel reactor (CaSO{sub 4}+ H{sub 2}) is developed by means of the commercial code FLUENT and the effects of partial pressure of H{sub 2} (concentration of H{sub 2}) on chemical looping combustion performance are also studied. The results show that the concentration of H{sub 2} could enhance the CLC performance.

Baosheng Jin; Rui Xiao; Zhongyi Deng; Qilei Song [Southeast University (China). Key Laboratory of Clean Coal Power Generation and Combustion Technology of Ministry of Education

2009-07-01T23:59:59.000Z

129

Computational fluid dynamics simulation of the air/suppressant flow in an uncluttered F18 engine nacelle  

SciTech Connect

For the purposes of designing improved Halon-alternative fire suppression strategies for aircraft applications, Computational Fluid Dynamics (CFD) simulations of the air flow, suppressant transport, and air-suppressant mixing within an uncluttered F18 engine nacelle were performed. The release of inert gases from a Solid Propellant Gas Generator (SPGG) was analyzed at two different injection locations in order to understand the effect of injection position on the flow patterns and the mixing of air and suppression agent. An uncluttered engine nacelle was simulated to provide insight into the global flow features as well as to promote comparisons with previous nacelle fire tests and recent water tunnel tests which included little or no clutter. Oxygen concentration levels, fuel/air residence times that would exist if a small fuel leak were present, velocity contours, and streamline patterns are presented inside the engine nacelle. The numerical results show the influence of the gent release location on regions of potential flame extinction due to oxygen inerting and high flame strain. The occurrence of inflow through the exhaust ducts on the aft end of the nacelle is also predicted. As expected, the predicted oxygen concentration levels were consistently higher than the measured levels since a fire was not modeled in this analysis. Despite differences in the conditions of these simulations and the experiments, good agreement was obtained between the CFD predictions and the experimental measurements.

Lopez, A.R.; Gritzo, L.A.; Hassan, B.

1997-06-01T23:59:59.000Z

130

Analytical and computational study of the ideal full two-fluid plasma model and asymptotic approximations for Hall-magnetohydrodynamics  

SciTech Connect

The 5-moment two-fluid plasma model uses Euler equations to describe the ion and electron fluids and Maxwell's equations to describe the electric and magnetic fields. Two-fluid physics becomes significant when the characteristic spatial scales are on the order of the ion skin depth and characteristic time scales are on the order of the ion cyclotron period. The full two-fluid plasma model has disparate characteristic speeds ranging from the ion and electron speeds of sound to the speed of light. Two asymptotic approximations are applied to the full two-fluid plasma to arrive at the Hall-MHD model, namely negligible electron inertia and infinite speed of light. The full two-fluid plasma model and the Hall-MHD model are studied for applications to an electromagnetic plasma shock, geospace environmental modeling (GEM challenge) magnetic reconnection, an axisymmetric Z-pinch, and an axisymmetric field reversed configuration (FRC).

Srinivasan, B.; Shumlak, U. [Aerospace and Energetics Research Program, University of Washington, Seattle, Washington 98195 (United States)

2011-09-15T23:59:59.000Z

131

Integrating multi-objective optimization with computational fluid dynamics to optimize boiler combustion process of a coal fired power plant  

Science Journals Connector (OSTI)

Abstract The dominant role of electricity generation and environment consideration have placed strong requirements on coal fired power plants, requiring them to improve boiler combustion efficiency and decrease carbon emission. Although neural network based optimization strategies are often applied to improve the coal fired power plant boiler efficiency, they are limited by some combustion related problems such as slagging. Slagging can seriously influence heat transfer rate and decrease the boiler efficiency. In addition, it is difficult to measure slag build-up. The lack of measurement for slagging can restrict conventional neural network based coal fired boiler optimization, because no data can be used to train the neural network. This paper proposes a novel method of integrating non-dominated sorting genetic algorithm (NSGA II) based multi-objective optimization with computational fluid dynamics (CFD) to decrease or even avoid slagging inside a coal fired boiler furnace and improve boiler combustion efficiency. Compared with conventional neural network based boiler optimization methods, the method developed in the work can control and optimize the fields of flue gas properties such as temperature field inside a boiler by adjusting the temperature and velocity of primary and secondary air in coal fired power plant boiler control systems. The temperature in the vicinity of water wall tubes of a boiler can be maintained within the ash melting temperature limit. The incoming ash particles cannot melt and bond to surface of heat transfer equipment of a boiler. So the trend of slagging inside furnace is controlled. Furthermore, the optimized boiler combustion can keep higher heat transfer efficiency than that of the non-optimized boiler combustion. The software is developed to realize the proposed method and obtain the encouraging results through combining ANSYS 14.5, ANSYS Fluent 14.5 and CORBA C++.

Xingrang Liu; R.C. Bansal

2014-01-01T23:59:59.000Z

132

NEPA CX Determination SS-SC-12-03 for the Stanford Research Computer Facility (SRCF)  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

3 for the Stanford Research Computer Facility (SRCF) 3 for the Stanford Research Computer Facility (SRCF) National Environmental Policy Act (NEPA) Categorical Exclusion (CX) Determination A. SSO NEPA Control #: SS-SC-12-03 AN12038 B. Brief Description of Proposed Action: The project scope includes the construction of a new computer facility (21,500 square feet) capable of providing 3 MW of data center potential. The new two-story facility will provide infrastructure for a multitude of server racks. There are three fenced service yards outside the building, one for chillers, one for new electrical substation equipment, and one for emergency generators. The ground floor will be utilized for electrical and receiving area; the second floor will have a server room, mechanical room, conference

133

Two-dimensional computational fluid dynamics and conduction simulations of heat transfer in window frames with internal cavities - Part 1: Cavities only  

E-Print Network (OSTI)

1980. Numerical heat transfer and fluid flow. Washington,of heat transfer by natural convection across vertical fluidFluid Dynamics and Conduction Simulations of Heat Transfer

Gustavsen, Arild; Kohler, Christian; Arasteh, Dariush; Curcija, Dragan

2003-01-01T23:59:59.000Z

134

Comparison of Hydrodynamic Load Predictions Between Engineering Models and Computational Fluid Dynamics for the OC4-DeepCwind Semi-Submersible: Preprint  

SciTech Connect

Hydrodynamic loads on the platforms of floating offshore wind turbines are often predicted with computer-aided engineering tools that employ Morison's equation and/or potential-flow theory. This work compares results from one such tool, FAST, NREL's wind turbine computer-aided engineering tool, and the computational fluid dynamics package, OpenFOAM, for the OC4-DeepCwind semi-submersible analyzed in the International Energy Agency Wind Task 30 project. Load predictions from HydroDyn, the offshore hydrodynamics module of FAST, are compared with high-fidelity results from OpenFOAM. HydroDyn uses a combination of Morison's equations and potential flow to predict the hydrodynamic forces on the structure. The implications of the assumptions in HydroDyn are evaluated based on this code-to-code comparison.

Benitz, M. A.; Schmidt, D. P.; Lackner, M. A.; Stewart, G. M.; Jonkman, J.; Robertson, A.

2014-09-01T23:59:59.000Z

135

Fluid Flow Modeling in Fractures  

E-Print Network (OSTI)

In this paper we study fluid flow in fractures using numerical simulation and address the challenging issue of hydraulic property characterization in fractures. The methodology is based on Computational Fluid Dynamics, ...

Sarkar, Sudipta

2004-01-01T23:59:59.000Z

136

Acoustic resonance determination of the effect of light hydrocarbons on wax appearance points in a Njord well fluid  

SciTech Connect

Wax formation and deposition in pipelines and process equipment pose severe problems for petroleum companies, especially during transportation of crude oil in offshore environments. The light hydrocarbons present in the crude oil can play an important role in the shift of wax appearance points by increasing the solubilities of the heavier components. The following work was undertaken to study the effect of light hydrocarbons on wax appearance points in a Njord well fluid for Norsk Hydro, Norway. An automated high-pressure spherical acoustic resonator (50.8-mm-diameter) assembly designed and fabricated for that purpose has been used to measure resonance frequencies in a Njord well fluid (stabilized oil sample) provided by Norsk Hydro and blended with the appropriate amount of a synthetically prepared gaseous mixture containing six light hydrocarbons (Cl to C6), at pressures from 2 to 107 bar and temperatures in the range 35 to 50{degrees}C. Results on the present method to locate the wax appearance points in the Njord well fluid are presented. A figure showing experimental wax appearance points as a function of pressure is presented. The results are compared with those predicted by the Norsk Hydro model.

Colgate, S.O.; Sivaraman, A.

1996-01-01T23:59:59.000Z

137

Reversible jump Markov chain Monte Carlo computation and Bayesian model determination  

E-Print Network (OSTI)

Markov chain Monte Carlo methods for Bayesian computation have until recently been restricted to problems where the joint distribution of all variables has a density with respect to some xed standard underlying measure. They have therefore not been available for application to Bayesian model determination, where the dimensionality of the parameter vector is typically not xed. This article proposes a new framework for the construction of reversible Markov chain samplers that jump between parameter subspaces of di ering dimensionality, which is exible and entirely constructive. It should therefore have wide applicability in model determination problems. The methodology is illustrated with applications to multiple change-point analysis in one and two dimensions, and toaBayesian comparison of binomial experiments.

Peter J. Green

1995-01-01T23:59:59.000Z

138

2014-02-21 Issuance: Proposed Determination of Computer and Battery Backup Systems as a Covered Consumer Product  

Energy.gov (U.S. Department of Energy (DOE))

This document is a pre-publication Federal Register notice of proposed determination regarding computer systems, as issued by the Deputy Assistant Secretary for Energy Efficiency on February 21, 2014.

139

Determination of fouling factors for shell-and-tube type heat exchangers exposed to Los Azufres geothermal fluids  

SciTech Connect

According to the latest estimates, there are about 1500 geothermal sites in Mexico, ninety percent of which can probably produce low enthalpy fluids only. Hot water discarded from geothermal flash plants adds to this stock which represents a considerable source of thermal energy. Its utilization for direct industrial applications or electricity generation through binary cycles requries heat exchangers. The IIE, with the financial support and technical cooperation of CFE, has for some time been experimenting with heaters of different types subject to geothermal brines. This paper describes the work done to date and the preliminary results obtained.

Hernandez-Galan, J.L. (Instituto de Investigaciones Electricas, Dante 36-6, 11590 Mexico City (MX)); Plauchu, A.L. (Geothermal Plants Design and Construction Mgr., CFE, AV. Camelinas 3527, Morelia, Mich., 58270 (MX))

1989-01-01T23:59:59.000Z

140

Green and Sensitive Supercritical Fluid ChromatographicTandem Mass Spectrometric Method for the Separation and Determination of Flutriafol Enantiomers in Vegetables, Fruits, and Soil  

Science Journals Connector (OSTI)

Green and Sensitive Supercritical Fluid ChromatographicTandem Mass Spectrometric Method for the Separation and Determination of Flutriafol Enantiomers in Vegetables, Fruits, and Soil ... Typical conditions were as follows: the cone voltage of flutriafol was 24 V; m/z 302.2 was selected as the precursor ion for flutriafol, m/z 123.04 for its product quantitative ion, and m/z 70.05 for its qualitative ion when the collision energy was set at 28 and 58 V. ...

Yan Tao; Fengshou Dong; Jun Xu; Xingang Liu; Youpu Cheng; Na Liu; Zenglong Chen; Yongquan Zheng

2014-11-07T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Using fluid buffering equilibria to determine values of H?O activity: an example from the amphibole-bearing spinel lherzolites of Caussou, French Pyrenees  

E-Print Network (OSTI)

USING FLUID BUFFERING EQUILIBRIA TO DETERMINE VALUES OF H 2 0 ACTIVITY: AN E X A M P L E F R O M T H E AMPHIBOLE-BEARING SPINEL LHERZOLITES OF CAUSSOU, FRENCH PYRENEES A Thesis by CRAIG EDWARD PETKO Submitted to the Office of Graduate Studies...-BEARING SPINEL LHERZOLITES OF CAUSSOU, FRENCH PYRENEES A Thesis by CRAIG EDWARD PETKO Submitted to Texas A & M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved as to style and content by: William M . Lam...

Petko, Craig Edward

2012-06-07T23:59:59.000Z

142

Computational fluid dynamics analyses of lateral heat conduction, coolant azimuthal mixing and heat transfer predictions in a BR2 fuel assembly geometry.  

SciTech Connect

To support the analyses related to the conversion of the BR2 core from highly-enriched (HEU) to low-enriched (LEU) fuel, the thermal-hydraulics codes PLTEMP and RELAP-3D are used to evaluate the safety margins during steady-state operation (PLTEMP), as well as after a loss-of-flow, loss-of-pressure, or a loss of coolant event (RELAP). In the 1-D PLTEMP and RELAP simulations, conduction in the azimuthal and axial directions is not accounted. The very good thermal conductivity of the cladding and the fuel meat and significant temperature gradients in the lateral directions (axial and azimuthal directions) could lead to a heat flux distribution that is significantly different than the power distribution. To evaluate the significance of the lateral heat conduction, 3-D computational fluid dynamics (CFD) simulations, using the CFD code STAR-CD, were performed. Safety margin calculations are typically performed for a hot stripe, i.e., an azimuthal region of the fuel plates/coolant channel containing the power peak. In a RELAP model, for example, a channel between two plates could be divided into a number of RELAP channels (stripes) in the azimuthal direction. In a PLTEMP model, the effect of azimuthal power peaking could be taken into account by using engineering factors. However, if the thermal mixing in the azimuthal direction of a coolant channel is significant, a stripping approach could be overly conservative by not taking into account this mixing. STAR-CD simulations were also performed to study the thermal mixing in the coolant. Section II of this document presents the results of the analyses of the lateral heat conduction and azimuthal thermal mixing in a coolant channel. Finally, PLTEMP and RELAP simulations rely on the use of correlations to determine heat transfer coefficients. Previous analyses showed that the Dittus-Boelter correlation gives significantly more conservative (lower) predictions than the correlations of Sieder-Tate and Petukhov. STAR-CD 3-D simulations were performed to compare heat transfer predictions from CFD and the correlations. Section III of this document presents the results of this analysis.

Tzanos, C. P.; Dionne, B. (Nuclear Engineering Division)

2011-05-23T23:59:59.000Z

143

Enabling the environmentally clean air transportation of the future: a vision of computational fluid dynamics in 2030  

Science Journals Connector (OSTI)

...recommendations from a recent NASA-funded...emissions. A recent report [1...revolutionary advances in CFD capability...aerodynamics, aerospace engineering...and computer science were used to...computational science. At the same...traditional aerospace engineering...substantial advances in simulation...

2014-01-01T23:59:59.000Z

144

The use of computed radiography plates to determine light and radiation field coincidence  

SciTech Connect

Purpose: Photo-stimulable phosphor computed radiography (CR) has characteristics that allow the output to be manipulated by both radiation and optical light. The authors have developed a method that uses these characteristics to carry out radiation field and light field coincidence quality assurance on linear accelerators.Methods: CR detectors from Kodak were used outside their cassettes to measure both radiation and light field edges from a Varian linear accelerator. The CR detector was first exposed to a radiation field and then to a slightly smaller light field. The light impinged on the detector's latent image, removing to an extent the portion exposed to the light field. The detector was then digitally scanned. A MATLAB-based algorithm was developed to automatically analyze the images and determine the edges of the light and radiation fields, the vector between the field centers, and the crosshair center. Radiographic film was also used as a control to confirm the radiation field size.Results: Analysis showed a high degree of repeatability with the proposed method. Results between the proposed method and radiographic film showed excellent agreement of the radiation field. The effect of varying monitor units and light exposure time was tested and found to be very small. Radiation and light field sizes were determined with an uncertainty of less than 1 mm, and light and crosshair centers were determined within 0.1 mm.Conclusions: A new method was developed to digitally determine the radiation and light field size using CR photo-stimulable phosphor plates. The method is quick and reproducible, allowing for the streamlined and robust assessment of light and radiation field coincidence, with no observer interpretation needed.

Kerns, James R. [Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030 and Graduate School of Biomedical Sciences, The University of Texas Health Science Center Houston, Houston, Texas 77030 (United States)] [Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030 and Graduate School of Biomedical Sciences, The University of Texas Health Science Center Houston, Houston, Texas 77030 (United States); Anand, Aman [Department of Radiation Oncology, Mayo Clinic, Scottsdale, Arizona 85259 (United States)] [Department of Radiation Oncology, Mayo Clinic, Scottsdale, Arizona 85259 (United States)

2013-11-15T23:59:59.000Z

145

Analysis, scientific computing and fundamental studies in fluid mechanics. Final report Number 21, May 1, 1997--September 30, 1998  

SciTech Connect

This report is a summary of work in progress and completed. Subject areas covered are: effective numerical methods for interfacial flows; multiscale finite element methods: analysis and applications; an efficient boundary integral method for the Mullins-Sekera problem; numerical simulation of three-dimensional water waves using a fast summation method; numerical solutions of steady-state rising bubbles; solidification coupled to fluid convection; turbulence models; exact solution of very viscous and Hele-Shaw flow; fundamental vortex dynamics; functional methods for turbulence; structure functions for isotropic turbulence; and water waves.

NONE

1998-12-31T23:59:59.000Z

146

Multipurpose Acoustic Sensor for Downhole Fluid Monitoring  

Energy.gov (U.S. Department of Energy (DOE))

Novel sensor design based on acoustics. Determine in real-timeand in a single sensor packagemultiple parameters: temperature, pressure, fluid flow; and fluid properties, such as density, viscosity, fluid composition.

147

Determination of Transport Properties From Flowing Fluid Temperature LoggingIn Unsaturated Fractured Rocks: Theory And Semi-Analytical Solution  

SciTech Connect

Flowing fluid temperature logging (FFTL) has been recently proposed as a method to locate flowing fractures. We argue that FFTL, backed up by data from high-precision distributed temperature sensors, can be a useful tool in locating flowing fractures and in estimating the transport properties of unsaturated fractured rocks. We have developed the theoretical background needed to analyze data from FFTL. In this paper, we present a simplified conceptualization of FFTL in unsaturated fractured rock, and develop a semianalytical solution for spatial and temporal variations of pressure and temperature inside a borehole in response to an applied perturbation (pumping of air from the borehole). We compare the semi-analytical solution with predictions from the TOUGH2 numerical simulator. Based on the semi-analytical solution, we propose a method to estimate the permeability of the fracture continuum surrounding the borehole. Using this proposed method, we estimated the effective fracture continuum permeability of the unsaturated rock hosting the Drift Scale Test (DST) at Yucca Mountain, Nevada. Our estimate compares well with previous independent estimates for fracture permeability of the DST host rock. The conceptual model of FFTL presented in this paper is based on the assumptions of single-phase flow, convection-only heat transfer, and negligible change in system state of the rock formation. In a sequel paper [Mukhopadhyay et al., 2008], we extend the conceptual model to evaluate some of these assumptions. We also perform inverse modeling of FFTL data to estimate, in addition to permeability, other transport parameters (such as porosity and thermal conductivity) of unsaturated fractured rocks.

Mukhopadhyay, Sumit; Tsang, Yvonne W.

2008-08-01T23:59:59.000Z

148

GEOTHERMAL FLUID PROPENE AND PROPANE: INDICATORS OF FLUID | Open Energy  

Open Energy Info (EERE)

FLUID PROPENE AND PROPANE: INDICATORS OF FLUID FLUID PROPENE AND PROPANE: INDICATORS OF FLUID Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: GEOTHERMAL FLUID PROPENE AND PROPANE: INDICATORS OF FLUID Details Activities (1) Areas (1) Regions (0) Abstract: The use of fluid inclusion gas analysis propene/propene ratios is investigated. Ratios of these species are affected by geothermal fluid temperature and oxidations state. Our purpose is to determine if analyses of these species in fluid inclusions these species to can be used to interpret fluid type, history, or process. Analyses were performed on drill cuttings at 20ft intervals from four Coso geothermal wells. Two wells are good producers, one has cold-water entrants in the production zone, and the fourth is a non-producer. The ratios show distinct differences between

149

Computing  

NLE Websites -- All DOE Office Websites (Extended Search)

assetsimagesicon-science.jpg Computing Providing world-class high performance computing capability that enables unsurpassed solutions to complex problems of...

150

Geophysical Fluid Dynamics Laboratory Review May 20 May 22, 2014  

E-Print Network (OSTI)

in modeling fluid dynamics and heat transfer in large facilities is being applied to the analysis of new might use 25% less fuel than a conventional vehicle. Cool Designs for Hot Spaces Computational Fluid Computational Fluid Dynamics model. (Image Right) Image showing the geometry of a typical Computational Fluid

151

MAX Fluid Dynamics facility  

NLE Websites -- All DOE Office Websites (Extended Search)

MAX Fluid Dynamics facility MAX Fluid Dynamics facility Capabilities Engineering Experimentation Reactor Safety Testing and Analysis Overview Nuclear Reactor Severe Accident Experiments MAX NSTF SNAKE Aerosol Experiments System Components Laser Applications Robots Applications Other Facilities Other Capabilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr MAX Fluid Dynamics facility Providing high resolution data for development of computational tools that model fluid flow and heat transfer within complex systems such as the core of a nuclear reactor. 1 2 3 4 5 Hot and cold air jets are mixed within a glass tank while laser-based anemometers and a high-speed infrared camera characterize fluid flow and heat transfer behavior. Click on image to view larger size image.

152

Visually simulating realistic fluid motion  

E-Print Network (OSTI)

where 0 stands for obstacle cell, S surface cell, F full cell, I inlet cell, U outlet cell and the cells not marked are empty cells . . . . . . 34 12 Area weighting interpolation scheme for determining local fluid velocity for a marker k [9] . . 35... in the fluid. It is measured as the force on the face of a unit cube, inserted into the fluid. If the pressure varies in the fluid, the fluid will move due to the acceleration generated by the pressure force. The pressure at a point is isotropic in a fluid...

Naithani, Priyanka

2012-06-07T23:59:59.000Z

153

Motion of Fluids in the Presence of a Boundary | ornl.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

Motion of Fluids in the Presence of a Boundary Motion of Fluids in the Presence of a Boundary Jan 09 2014 10:00 AM - 11:00 AM Gung-Min Gie, Indiana University, Bloomington Computer Science and Mathematics Division Seminar Joint Institute for Computational Sciences (Building 5100), Auditorium (Room 128) CONTACT : Email: Clayton Webster Phone:865.574.3649 Add to Calendar SHARE In most practical applications of fluid mechanics, it is the interaction of the fluid with the boundary that is most critical to understanding the behavior of the fluid. Physically important parameters, such as the lift and drag of a wing, are determined by the sharp transition the air makes from being at rest on the wing to flowing freely around the airplane near the wing. Mathematically, the behavior of such flows at small viscosity is

154

Fluid Volumes: The Program FLUIDS  

Science Journals Connector (OSTI)

This chapter describes the program FLUIDS. The mathematical model underlying this program contains over 200 variables and describes control mechanisms of body fluid volumes and electrolytes as well as respirat...

Fredericus B. M. Min

1993-01-01T23:59:59.000Z

155

Computer  

NLE Websites -- All DOE Office Websites (Extended Search)

trajectory, and estimate the accuracy of the reconstruction. First, a computer model is used to create images of the torus interior from any candidate camera...

156

Advanced binary cycles: Optimum working fluids  

SciTech Connect

A computer model (Cycle Analysis Simulation Tool, CAST) and a methodology have been developed to perform value analysis for small, low- to moderate-temperature binary geothermal power plants. The value analysis method allows for incremental changes in the levelized electricity cost (LEC) to be determined between a baseline plant and a modified plant. Thermodynamic cycle analyses and component sizing are carried out in the model followed by economic analysis which provides LEC results. The emphasis of the present work is on evaluating the effect of mixed working fluids instead of pure fluids on the LEC of a geothermal binary plant that uses a simple Organic Rankine Cycle. Four resources were studied spanning the range of 265 F to 375 F. A variety of isobutane and propane based mixtures, in addition to pure fluids, were used as working fluids. This study shows that the use of propane mixtures at a 265 F resource can reduce the LEC by 24% when compared to a base case value that utilizes commercial isobutane as its working fluid. The cost savings drop to 6% for a 375 F resource, where an isobutane mixture is favored. Supercritical cycles were found to have the lowest cost at all resources.

Gawlik, K.; Hassani, V. [National Renewable Energy Lab., Golden, CO (United States)

1997-12-31T23:59:59.000Z

157

Computing  

NLE Websites -- All DOE Office Websites (Extended Search)

Computing Computing and Storage Requirements Computing and Storage Requirements for FES J. Candy General Atomics, San Diego, CA Presented at DOE Technical Program Review Hilton Washington DC/Rockville Rockville, MD 19-20 March 2013 2 Computing and Storage Requirements Drift waves and tokamak plasma turbulence Role in the context of fusion research * Plasma performance: In tokamak plasmas, performance is limited by turbulent radial transport of both energy and particles. * Gradient-driven: This turbulent transport is caused by drift-wave instabilities, driven by free energy in plasma temperature and density gradients. * Unavoidable: These instabilities will persist in a reactor. * Various types (asymptotic theory): ITG, TIM, TEM, ETG . . . + Electromagnetic variants (AITG, etc). 3 Computing and Storage Requirements Fokker-Planck Theory of Plasma Transport Basic equation still

158

Pitch-catch only ultrasonic fluid densitometer  

DOE Patents (OSTI)

The present invention is an ultrasonic fluid densitometer that uses a material wedge and pitch-catch only ultrasonic transducers for transmitting and receiving ultrasonic signals internally reflected within the material wedge. Density of a fluid is determined by immersing the wedge into the fluid and measuring reflection of ultrasound at the wedge-fluid interface.

Greenwood, Margaret S. (Richland, WA); Harris, Robert V. (Pasco, WA)

1999-01-01T23:59:59.000Z

159

Pitch-catch only ultrasonic fluid densitometer  

DOE Patents (OSTI)

The present invention is an ultrasonic fluid densitometer that uses a material wedge and pitch-catch only ultrasonic transducers for transmitting and receiving ultrasonic signals internally reflected within the material wedge. Density of a fluid is determined by immersing the wedge into the fluid and measuring reflection of ultrasound at the wedge-fluid interface. 6 figs.

Greenwood, M.S.; Harris, R.V.

1999-03-23T23:59:59.000Z

160

Viscosity of Quantum Hall Fluids  

Science Journals Connector (OSTI)

The viscosity of quantum fluids with an energy gap at zero temperature is related to the adiabatic curvature on the space parametrizing flat background metrics. For quantum Hall fluids on two-dimensional tori, the quantum viscosity is computed. It turns out to be isotropic, constant, and proportional to the magnetic field strength.

J. E. Avron; R. Seiler; P. G. Zograf

1995-07-24T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Computational Knee Ligament Modeling Using Experimentally Determined Zero-Load Lengths  

E-Print Network (OSTI)

to model kinematics [7, 9]. In this method, cadaver knees are loaded with known forces (for example with a robotic testing system [13]) and ligament parameters are modified until the kinematic error between model and experiment is minimized. This method... Corporation, Santa Ana, CA) (Fig. 1). The anatomical points identified during the cadaver testing were used to align the knee geometries (tibia, femur, and patella) with the machine in the computational model. Compliant contacts were then defined between...

Bloemker, Katherine H.; Guess, Trent M.; Maletsky, Lorin; Dodd, Kevin A.

2012-04-01T23:59:59.000Z

162

Introduction Fluid/Jeans  

E-Print Network (OSTI)

Introduction Fluid/DMSC Fluid/Jeans Comments Fluid/Kinetic Hybrid Modeling of the Thermosphere;Introduction Fluid/DMSC Fluid/Jeans Comments Outline 1 Fluid/DMSC 2 Fluid/Jeans 3 Comments Justin Erwin Fluid/Kinetic Hybrid Modeling of the Thermosphere of Pluto #12;Introduction Fluid/DMSC Fluid/Jeans Comments Motivation

Johnson, Robert E.

163

Determination of self-absorption corrections by computation in routine gamma-ray spectrometry for typical environmental samples  

SciTech Connect

A simple and practical method has been developed to quickly calculate self-absorption corrections and mass attenuation coefficients, {mu}/p, in common environmental samples being analyzed by gamma-ray spectrometry. The method involves using a sample computer program and estimates of the elemental compositions of typical environmental samples. The use of this method eliminates the need for gamma-ray-transmission measurements of individual samples, as well as expensive and time consuming elemental analyses of routine samples. The calculated percent attenuation of the beam through various samples, as determined by this method, agrees very well with experimentally measured values of percent attenuation.

Oresegun, M.O. [Univ. of Ibadan (Nigeria); Decker, K.M.; Sanderson, C.G. [Environmental Measurements Lab., New York, NY (United States)

1993-12-31T23:59:59.000Z

164

Analysis of the Newphew/Spore model for determining costs of coal mining in Appalachia. Computer model study. Final report  

SciTech Connect

The purpose of the study was primarily to determine whether a computer program developed to determine the costs of coal surface mining and reclamation in Appalachia was capable of being responsive to the needs of the Office of Surface Mining for projecting the extraction costs of coal in support of the Small Operator Assistance Program. The study analysis validated the model and adapted it to specific small operator needs in terms of user flexibility. It found that the model as originally programmed was subject to a number of limitations and functional constraints. Although a substantial loosening of these constraints was not feasible within the current scope of work, it did establish an approach to reprogram the model to take into account dynamically certain previously static aspects of the model. The approach was implemented in order to made the model more useful and to establish a baseline for future development.

Nephew, E.A.; Spore, R.L.

1980-06-06T23:59:59.000Z

165

Computer graphic simulations of microscopic particle collisions for determining macroscopic thermodynamics along a path  

Science Journals Connector (OSTI)

The heat absorbed by an ideal monotomic gas during an isothermal expansionwhen a piston slowly moves from volume point V 1 to V 2 in a cylinderis a standard problem in thermodynamics. Students taking the SP226 Heat Light and Sound course learn that the process involves (a) an understanding of the kinetic energy loss that a gas molecule makes with the slowly moving piston called the bunt (b) the drop in internal energy of the gas as a collection which leads to a slight drop in temperature of the gas and (c) the transfer of heat from the reservoir to the gas until an equilibrium temperature is reached. This problem is modeled in two dimensions on a computer. The collisions involve Nelastic scatterers that each have a cross section of radius r 0. The heat resevoir is modeled by molecules having a random distribution of velocities at the wall boundary which is in contact with the gas. The piston is modeled as a wall which moves at the speed V wall. Thermodynamic calculations involving work heat and entropy are attempted for the model system. Adiabatic and free expansions are also simulated and compared with the well?known theoretical results. Work is extended to cover collisions involving intermolecular potentials.

Devin P. Espindle; Murray S. Korman

1994-01-01T23:59:59.000Z

166

Fluid inflation  

SciTech Connect

In this work we present an inflationary mechanism based on fluid dynamics. Starting with the action for a single barotropic perfect fluid, we outline the procedure to calculate the power spectrum and the bispectrum of the curvature perturbation. It is shown that a perfect barotropic fluid naturally gives rise to a non-attractor inflationary universe in which the curvature perturbation is not frozen on super-horizon scales. We show that a scale-invariant power spectrum can be obtained with the local non-Gaussianity parameter f{sub NL} = 5/2.

Chen, X. [Centre for Theoretical Cosmology, DAMTP, University of Cambridge, Cambridge CB3 0WA (United Kingdom); Firouzjahi, H. [School of Astronomy, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran (Iran, Islamic Republic of); Namjoo, M.H. [School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran (Iran, Islamic Republic of); Sasaki, M., E-mail: x.chen@damtp.cam.ac.uk, E-mail: firouz@ipm.ir, E-mail: mh.namjoo@ipm.ir, E-mail: misao@yukawa.kyoto-u.ac.jp [Yukawa Institute for theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)

2013-09-01T23:59:59.000Z

167

Experimental Determinations of the Activity-Composition Relations and Phase Equilibria of H{sub 2}O-CO{sub 2}-NaCl Fluids  

SciTech Connect

An understanding of activity-composition (a/X) relations and phase equilibria for halite-bearing, mixed-species supercritical fluids is critically important in many geological and industrial applications. The authors have performed experiments on the a/X relations and phase equilibria of H{sub 2}O-CO{sub 2}-NaCl fluids at 5OO C, 500 bars, to obtain highly accurate and precise data for this ternary system. H{sub 2}O-CO{sub 2}-NaCl samples were reacted at a (H{sub 2}O) = 0.350, 0.425, 0.437, 0.448, 0.560, 0.606, 0.678, 0.798, and 0.841. Results indicate that fluids with these activities lie in the vapor-NaCl two-phase region, and that a fluid with the last value has a composition close to the three-phase (vapor + brine + halite) field. Data from these experiments and NaCl solubility runs also suggest that the vapor comer of the three-phase field lies near X(H{sub 2}O) = 0.760, X(NaCl) = 0.065, which is a significantly more water-rich composition than suggested by the model of [1].

Anovitz, L.M.; Labotka, T.C.; Blencoe, J.G.; Singh, J.; Horita, J.

1999-09-12T23:59:59.000Z

168

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS Int. J. Numer. Meth. Fluids 31: 345358 (1999)  

E-Print Network (OSTI)

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS Int. J. Numer. Meth. Fluids 31: 345­358 (1999 AND S. ROYc,3 a Engineering Science Program, MAES Department, 316A Perkins Hall, Uni6ersity of Tennessee Corporation, Burr Ridge, IL, USA SUMMARY The quest continues for accurate and efficient computational fluid

Roy, Subrata

169

From: Numerical Grid Generation in Computational Fluid Dynamics and Related Fields, ed. B. K. Soni, J. F. Thompson, H. Hausser and P. R.  

E-Print Network (OSTI)

. GEOMESH is a modeling tool developed for automating finite element grid generation. This tool maintains represent an important boundary condition in reservoir simulations. Rapid changes and large pressure for Finite Element Grids Terry A. Cherry1 Carl W. Gable1 Harold Trease2 ABSTRACT Modeling fluid, vapor

Gable, Carl W.

170

Synthetic fluid inclusions: XII. The system H[sub 2]O-NaCl. Experimental determination of the halite liquidus and isochores for a 40 wt% NaCl solution  

SciTech Connect

The slopes of the liquidus and lines of constant liquid-vapor homogenization temperature (iso-Th) in P-T space for a 40 wt% NaCl bulk composition in the H[sub 2]O-NaCl system were determined using synthetic fluid inclusions. Inclusions were synthesized in the one-phase field at 350-800[degrees]C and 1-6 kbar, and the temperatures of liquid-vapor homogenization and halite dissolution were determined on a heating/cooling stage. The pressure along the liquidus corresponding to a measured halite dissolution temperature [Tm (halite)] was determined from the intersection of the inclusion iso-Th line in the one-phase field with the measured liquid-vapor homogenization temperature [Th [L-V

Bodnar, R.J. (Virginia Polytechnic Institute and State Univ., Blacksburg, VA (United States))

1994-02-01T23:59:59.000Z

171

Organic Rankine-Cycle Power Systems Working Fluids Study: Topical report No. 3, 2-methylpyridine/water  

SciTech Connect

A mixture of 35 mole percent (mol %) 2-methylpyridine and 65 mol % water was tested at 575, 625, and 675/degree/F in a dynamic loop. Samples of the degraded fluid were chemically analyzed to determine the identities of major degradation products and the quantity of degradation. Computed degradation rates were found to be higher than those for Fluorinol 85 or toluene. For this reason (and other reasons, related to fluid handling), other fluids are recommended as the first choice for service in organic Rankine-cycle systems in preference to 2-methylpyridine/water. 7 refs., 39 figs., 39 tabs.

Cole, R.L.; Demirgian, J.C.; Allen, J.W.

1987-09-01T23:59:59.000Z

172

Determination of Total Biodiesel Fatty Acid Methyl, Ethyl Esters, and Hydrocarbon Types in Diesel Fuels by Supercritical Fluid Chromatography-Flame Ionization Detection  

Science Journals Connector (OSTI)

......Determination of Total Biodiesel Fatty Acid Methyl...vortex mixer. This process produced solutions ranging...D5186 indicated that the biodiesel esters were not eluted...0%. For further evaluation, the quantitative analysis...determination of the biodiesel ester components by......

John W. Diehl; Frank P. DiSanzo

173

Downhole Fluid Analyzer Development  

SciTech Connect

A novel fiber optic downhole fluid analyzer has been developed for operation in production wells. This device will allow real-time determination of the oil, gas and water fractions of fluids from different zones in a multizone or multilateral completion environment. The device uses near infrared spectroscopy and induced fluorescence measurement to unambiguously determine the oil, water and gas concentrations at all but the highest water cuts. The only downhole components of the system are the fiber optic cable and windows. All of the active components--light sources, sensors, detection electronics and software--will be located at the surface, and will be able to operate multiple downhole probes. Laboratory testing has demonstrated that the sensor can accurately determine oil, water and gas fractions with a less than 5 percent standard error. Once installed in an intelligent completion, this sensor will give the operating company timely information about the fluids arising from various zones or multilaterals in a complex completion pattern, allowing informed decisions to be made on controlling production. The research and development tasks are discussed along with a market analysis.

Bill Turner

2006-11-28T23:59:59.000Z

174

Predicting the Three Dimensional Distribution of Gas Pollutants for Industrial-type Geometries in the South Pars Gas Complex Using Computational Fluid Dynamics  

Science Journals Connector (OSTI)

In the present investigation, a comprehensive map of the studied region, which includes several gas refinery phases, was prepared. ... The Reynolds averaged NavierStokes equations for continuity and momentum are defined as follows:(24, 25, 30, 31)(2)(3)where ? and ?t are molecular viscosity and turbulent viscosity, respectively, ? is density of the main fluid, V is mean velocity vector, P is static pressure, g is the gravitational acceleration, and Sm is the mass added to the continuous phase from other sources. ... Comparison between the CFD Calculated Concentration of the Pollutants in Two Different Input Wind Velocities of 2.5 and 3.5 (m/s) ...

Hessamodin Nourbakhsh; Dariush Mowla; Feridun Esmaeilzadeh

2013-04-02T23:59:59.000Z

175

CX-003045: Categorical Exclusion Determination | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

045: Categorical Exclusion Determination 045: Categorical Exclusion Determination CX-003045: Categorical Exclusion Determination Computational Fluid Dynamics (CFD) Simulations of a Regenerative Process for Carbon Dioxide Capture in Advanced Gasification Based Systems CX(s) Applied: B3.6 Date: 07/19/2010 Location(s): Chicago, Illinois Office(s): Fossil Energy, National Energy Technology Laboratory The overall objective of the proposed program is to develop a computational fluid dynamics (CFD) model and to perform CFD simulations to describe the heterogeneous gas-solid absorption/regeneration and water gas shift (WGS) reactions. DOCUMENT(S) AVAILABLE FOR DOWNLOAD CX-003045.pdf More Documents & Publications CX-004510: Categorical Exclusion Determination CX-004511: Categorical Exclusion Determination

176

Application of fluid opacity for determining the phase behavior of binary mixtures near their critical loci CO2 plus ethane and CO2 plus propane  

Science Journals Connector (OSTI)

The rapid determination of critical data of binary mixtures of carbon dioxide plus propane and carbon dioxide plus ethane has been carried out using the opalescence effect of pure substances or mixtures near ...

A. Martin; Sigmar Mothes; Gerhard Mannsfeld

1999-08-01T23:59:59.000Z

177

Excitations of Bose Fluids in Nanotubes  

Science Journals Connector (OSTI)

We discuss the excitation spectra of Bose fluids in the quasi-one dimensional geometries which can be found in interstitial channels of nanotubes and inside individual nanotubes. We compute the collective excitat...

E. S. Hernndez; M. W. Cole

2002-01-01T23:59:59.000Z

178

Improving rendering times of Autodesk Maya Fluids using the GPU.  

E-Print Network (OSTI)

?? Fluid simulation is today a hot topic in computer graphics. New highly optimized algorithms have allowed complex systems to be simulated in high speed. (more)

Andersson, Jonas

2008-01-01T23:59:59.000Z

179

Determination of Total Biodiesel Fatty Acid Methyl, Ethyl Esters, and Hydrocarbon Types in Diesel Fuels by Supercritical Fluid Chromatography-Flame Ionization Detection  

Science Journals Connector (OSTI)

......Research and Engineering, Paulsboro...determining total biodiesel methyl and...in diesel fuels by supercritical...mixture. Introduction The proposed use of biodiesel esters derived...as diesel fuel blending...of Total Biodiesel Fatty Acid...in Diesel Fuels by Supercritical...Research and Engineering, Paulsboro......

John W. Diehl; Frank P. DiSanzo

180

RETRAN-02: A program for transient thermal-hydraulic analysis of complex fluid flow systems: Volume 5, Modeling guidelines: Computer code manual  

SciTech Connect

RETRAN is a computer code designed to perform overall system response analyses of reactor power plants. The RETRAN code uses plant geometry, initial thermal-hydraulic states, component data, control function descriptions, and physics data as input to calculate the overall plant system thermal-hydraulic response during a transient. Where additional detail is required, the overall system response calculated by RETRAN can be used as a boundary condition for the detailed analysis.

Harrison, J.F.; Farman, R.F.; Peterson, C.E.; Jensen, P.J.

1987-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Heat transfer and friction factor analysis in a circular tube with Al2O3 nanofluid by using computational fluid dynamics  

Science Journals Connector (OSTI)

Turbulent fully developed flow heat transfer coefficient and friction factor of Al2O3 nanoparticles are dispersed in water and ethylene glycol in circular tube is discussed in this paper. In order to validate the heat transfer coefficient and friction factor of nanofluid in circular tube commercially available CFD software FLUENT 6.0 is used. To achieve the fully developed flow condition, the aspect ratio (L/D) of the test section is equal to 94. The thermo-physical properties of the Al2O3 nanofluid are estimated by using the equations available in literature. Thermo-physical properties of the nanofluid are considered for heat transfer coefficient and friction factor by assuming nanofluid is a single-phase fluid. Constant Wall Heat Flux (CWHF) boundary condition is incorporated for heat transfer analysis and adiabatic boundary condition is incorporated for friction factor analysis. The analysis is conducted in the volume concentration range from 0.1% to 4%. A maximum of 2.25 times heat transfer enhancement and 1.42 times of friction is obtained by using nanofluid as working medium.

L. Syam Sundar; K.V. Sharma; Shabana Parveen

2009-01-01T23:59:59.000Z

182

Viscosity of Quantum Hall Fluids J. E. Avron  

E-Print Network (OSTI)

Viscosity of Quantum Hall Fluids J. E. Avron Department of Physics, Technion, 32000 Haifa, Israel R April 25, 1997 Abstract The viscosity of quantum fluids with an energy gap at zero temperature is non of the parameter space). For a quantum Hall fluid on two dimensional tori this viscosity is computed. In this case

183

Nonlinear alternating current responses of dipolar fluids J. P. Huang  

E-Print Network (OSTI)

Nonlinear alternating current responses of dipolar fluids J. P. Huang Max Planck Institute Mechanics Group, Laboratory of Computational Engineering, Helsinki University of Technology, P. O. Box 9203-dependent nonlinear dielectric increment of dipolar fluids in nonpolar fluids is often mea- sured by using

Huang, Ji-Ping

184

A theoretical approach for assessing the role of rock and fluid properties in the development of abnormal fluid pressures  

E-Print Network (OSTI)

and shales. The important parameters determining the extent of fluid pressure preservation are the geothermal gradient, the thermal loading rate, and the hydraulic diffusivity, K/Ss, of the rock . The highest fluid pressure development is expected... Variation of fluid expansivity and fluid compressibility with depth for a 25C/km geothermal gradient Page 14 Pressure response in different rock types and for various boundary conditions under . constant fluid mass 25 Values of or/Bf as a function...

Hastings, Thomas Worcester

2012-06-07T23:59:59.000Z

185

Fluid Inclusion Gas Analysis  

SciTech Connect

Fluid inclusion gas analysis for wells in various geothermal areas. Analyses used in developing fluid inclusion stratigraphy for wells and defining fluids across the geothermal fields. Each sample has mass spectrum counts for 180 chemical species.

Dilley, Lorie

2013-01-01T23:59:59.000Z

186

A Computational Method for Determining Distributed Aerodynamic Loads on Planforms of Arbitrary Shape in Compressible Subsonic Flow  

E-Print Network (OSTI)

The methods presented in this work are intended to provided an easy to understand and easy to apply method for determining the distributed aerodynamic loads and aerodynamic characteristics of planforms of nearly arbitrary shape. Through application...

Brown, Matthew Alan

2013-12-31T23:59:59.000Z

187

Fluid casting of particle-based articles  

DOE Patents (OSTI)

A method for the production of articles made of a particle-based material; e.g., ceramics and sintered metals. In accordance with one aspect of the invention, a thermally settable slurry containing a relatively high concentration of the particles is introduced into an immiscible, heated fluid. The slurry sets or hardens into a shape determined by the physical characteristics of the fluid and the manner of introduction of the slurry into the fluid. For example, the slurry is pulse injected into the fluid to provide spherical articles. The hardened spheres may then be sintered to consolidate the particles and provide a high density product.

Menchhofer, Paul (Oak Ridge, TN)

1995-01-01T23:59:59.000Z

188

Analysis of fluid inclusions in halite  

SciTech Connect

A technique has been developed to drill into fluid inclusions in halite, to extract the inclusions fluids, and to determine the concentration of all of the major and some of the minor constituents in these fluids. The minimum diameter of usable fluid inclusions is ca. 250 ..mu..m. After dilution, the fluids are analyzed by ion chromatography and coulometry. Uncertainties in the concentration of the major cations and anions is on the order of 4%. The analytical scheme provides much more precise analyses of inclusion fluids than have been available to date. The analyses are a useful starting point for reconstructing the composition of the sea water from which the evaporite brines evolved.

Lazar, B.; Holland, H.D.

1988-02-01T23:59:59.000Z

189

Fluid transport container  

DOE Patents (OSTI)

An improved fluid container for the transport, collection, and dispensing of a sample fluid that maintains the fluid integrity relative to the conditions of the location at which it is taken. More specifically, the invention is a fluid sample transport container that utilizes a fitting for both penetrating and sealing a storage container under controlled conditions. Additionally, the invention allows for the periodic withdrawal of portions of the sample fluid without contamination or intermixing from the environment surrounding the sample container. 13 figs.

DeRoos, B.G.; Downing, J.P. Jr.; Neal, M.P.

1995-11-14T23:59:59.000Z

190

Fluid Lab Analysis | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Fluid Lab Analysis Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Fluid Lab Analysis Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Lab Analysis Techniques Exploration Sub Group: Fluid Lab Analysis Parent Exploration Technique: Lab Analysis Techniques Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Results can aid in the determination of fluid source regions and circulation pathways, and assist in determining the degree of mixing between different hydrothermal fluids. Thermal: Certain elements exhibit high spatial correlation with high-temperature geothermal systems; Isotopic ratios can be used to characterize and locate subsurface thermal anomalies.

191

Computational Aerodynamics and Aeroacoustics for Wind Turbines  

E-Print Network (OSTI)

Computational Aerodynamics and Aeroacoustics for Wind Turbines #12;#12;Computational Aerodynamics and Aeroacoustics for Wind Turbines Wen Zhong Shen Fluid Mechanics Department of Mechanical Engineering TECHNICAL Shen, Wen Zhong Computational Aerodynamics and Aeroacoustics for Wind Turbines Doctor Thesis Technical

192

2014-03-26 Issuance: Proposed Determination of Computer and Battery Backup Systems as a Covered Consumer Product; Extension of Public Comment Period  

Energy.gov (U.S. Department of Energy (DOE))

This document is a pre-publication Federal Register notice extending the public comment period for the proposed determination of computer and battery backup systems, as issued by the Deputy Assistant Secretary for Energy Efficiency on March 26, 2014. Though it is not intended or expected, should any discrepancy occur between the document posted here and the document published in the Federal Register, the Federal Register publication controls. This document is being made available through the Internet solely as a means to facilitate the public's access to this document.

193

Department of Mechanical Engineering Spring 2013 Fluid Level Sensing  

E-Print Network (OSTI)

PENNSTATE Department of Mechanical Engineering Spring 2013 Fluid Level Sensing Overview The current course of action to determine the level of fluid in a tank on a tractor requires the operator to get out a system capable of measuring the volume of fluid in a non-uniform reservoir and displaying the value

Demirel, Melik C.

194

Enabling Computational Methods for Offshore Wind Turbines  

Science Journals Connector (OSTI)

In this book chapter we give an overview of our recent work in computational methods for geometry modeling, fluid mechanics, structural mechanics, and fluidstructure interaction that enable high-fidelity simulat...

Y. Bazilevs; M.-C. Hsu; I. Akkerman

2013-01-01T23:59:59.000Z

195

Isotopic Analysis- Fluid At Roosevelt Hot Springs Geothermal...  

Open Energy Info (EERE)

and literature review of the Roosevelt Hot Springs Geothermal Area. Notes Stable isotope analysis of thermal fluids determined meteoric origin primarily from the Mineral...

196

Standardization of Thermo-Fluid Modeling in Modelica.Fluid  

E-Print Network (OSTI)

Thermo-Fluid Systems, Modelica 2003 Conference, Linkping,H. Tummescheit: The Modelica Fluid and Media Library forThermo-Fluid Pipe Networks, Modelica 2006 Conference, Vi-

Franke, Rudiger

2010-01-01T23:59:59.000Z

197

From detonation to diapers: Los Alamos computer codes at core...  

NLE Websites -- All DOE Office Websites (Extended Search)

From detonation to diapers Los Alamos computer codes at core of advanced manufacturing tools The computer codes used for predictive fluid modeling are part of the Los Alamos...

198

Environmentally safe fluid extractor  

DOE Patents (OSTI)

An environmentally safe fluid extraction device for use in mobile laboratory and industrial settings comprising a pump, compressor, valving system, waste recovery tank, fluid tank, and a exhaust filtering system.

Sungaila, Zenon F. (Orland Park, IL)

1993-01-01T23:59:59.000Z

199

HEAT TRANSFER FLUIDS  

E-Print Network (OSTI)

The choice of heat transfer fluids has significant effects on the performance, cost, and reliability of solar thermal systems. In this chapter, we evaluate existing heat transfer fluids such as oils and molten salts based ...

Lenert, Andrej

2012-01-01T23:59:59.000Z

200

Numerical Simulation of Heat Transfer and Fluid Flow Characteristics of Server Rack in Datacenter  

Science Journals Connector (OSTI)

This chapter is studying the fluid mechanics and heat transfer of single server rack using the computational fluid dynamics software. The ... effect of the different structure parameters of server rack in datacen...

Jianfei Zhang; Donghao Liu; Xiping Qiao

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Fluid force transducer  

DOE Patents (OSTI)

An electrical fluid force transducer for measuring the magnitude and direction of fluid forces caused by lateral fluid flow, includes a movable sleeve which is deflectable in response to the movement of fluid, and a rod fixed to the sleeve to translate forces applied to the sleeve to strain gauges attached to the rod, the strain gauges being connected in a bridge circuit arrangement enabling generation of a signal output indicative of the magnitude and direction of the force applied to the sleeve.

Jendrzejczyk, Joseph A. (Warrenville, IL)

1982-01-01T23:59:59.000Z

202

Equipment and procedures for fluid flow and wettability tests of geological materials  

SciTech Connect

The Bartlesville Energy Technology Center, US Department of Energy, has developed several unique types of laboratory apparatus: (1) equipment for measurement of petroleum reservoir fluids at simulated subsurface conditions of temperature and pressure, (2) apparatus for saturation of geological cores with liquids, (3) design of a low internal volume pressure relief valve, and (4) apparatus and procedures for the quantitative determination of the relative wetting of oil and water on geologic materials. The fluid flow apparatus operates on the principles of liquid chromatography except for the replacement of the standard chromatographic column by a geologic core sample; it can be operated at an internal pore pressure of 400 atmospheres and 150/sup 0/C. The apparatus can be applied to the measurement of the adsorption characteristics of reservoir fluids such as surfactants, polymers, chemical tracers and biocides; it is also applicable to the determination of relative permeability relationships and miscible and immiscible fluid flow behavior. The apparatus for the saturation of geologic cores is adaptable for simultaneous saturation of several small cores or a single core up to 50 cm in length and 4 cm in diameter. The pressure relief valve has an internal volume less than 0.5 ml and can operate at pressures as high as 500 atmospheres. The apparatus for determination of wettability was constructed by modification of a commercial centrifuge and the procedure is based on the thermodynamic work required for fluid displacement from a porous medium. This paper incorporates the design features and operational procedures of the apparatus in addition to the computer programs for calculation of miscible phase dispersion of reservoir fluids and adsorption characteristics of reservoir chemicals.

Donaldson, E.C.; Kendall, R.F.; Pavelka, E.A.; Crocker, M.E.

1980-05-01T23:59:59.000Z

203

Fluid Catalytic Cracking Power Recovery Computer Simulation  

E-Print Network (OSTI)

re covery available in new plants results in the air string being almost self sustaining, 8S far as direct input power. With some processes, it is possible to produce excess power on the order of 1,000 to 9,000 HP. Waste heat recovery in the form...

Samurin, N. A.

1979-01-01T23:59:59.000Z

204

Distributed computational fluid dynamics Karl Jenkins  

E-Print Network (OSTI)

of large and complex datasets. Thus, remote access to this information is an integral part of the CFD turbulent combustion pro- cesses is a strong coupling between turbulence, chemical kinetics and heat release provides a route around the departmental firewalls. The clusters run Globus and Condor for remote job

de Gispert, Adrià

205

Synthetic fluid inclusions: XIII. Experimental determination of PVT properties in the system H{sub 2}O + 40 wt% NaCl + 5 mol% CO{sub 2} at elevated temperature and pressure  

SciTech Connect

The location of the liquid + vapor {yields} liquid phase boundary and the P-T slopes of iso-Th lines were determined for a constant composition of 40 {+-} 0.1 wt% NaCl 5 {+-} 0.15 mol% CO{sub 2} (both relative) to H{sub 2}O at high density. Synthetic fluid inclusions with this composition were formed in cold-seal pressure vessels at pressures of 2 and 4 kbar and temperatures between 350{degrees}C and 700{degrees}C. The inclusions were analyzed on a gas-flow heating/cooling stage to determine the temperatures of halite dissolution [Tm{sub (H+L+V{yields}L+V)}] and total homogenization [Th{sub (L+V{yields}L)}]. Addition to 40 wt% NaCl to an aqueous solution containing 5 mol% CO{sub 2} causes a significant shift of the liquid + vapor {yields} liquid boundary towards higher pressures. The slopes of the iso-Th lines decrease from 29.5 bars/{degrees}C for Th{sub (L+V{yields}L)} of 400{degrees}C, to 6.4 bars/{degrees}C for Th{sub (L+V{yields})} = 600{degrees}C. Addition of 5 mol% CO{sub 2} to an aqueous solution containing 40 wt% NaCl results in halite dissolution temperatures that are slightly higher (Tm{sub (H+L+V{yields}L+V)} {approx} 332{degrees}C) than the literature value of 323{degrees}C for the vapor-saturated liquidus of an H{sub 2}O-40 wt% NaCl mixture. Calculated molar volumes for 40 wt% NaCl + 5 mol% CO{sub 2} solutions at 2 and 4 kbar show trends that are similar to those of other compositions in the ternary system H{sub 2}O-CO{sub 2}-NaCl at the same pressures and temperatures. In the P-T range of this study, all excess volumes are negative and lie between the values for the compositions H{sub 2}O-5 mol% CO{sub 2} and H{sub 2}O-40 wt% NaCl. 30 refs., 6 figs., 2 tabs.

Schmidt, C.; Rosso, K.M.; Bodnar, R.J. [Virginia Polytechnic Institute and State Univ., Blackburg, VA (United States)] [Virginia Polytechnic Institute and State Univ., Blackburg, VA (United States)

1995-10-01T23:59:59.000Z

206

Heat Transfer and Fluid Mechanics - Nuclear Engineering Division (Argonne)  

NLE Websites -- All DOE Office Websites (Extended Search)

Engineering Computation Engineering Computation and Design > Heat Transfer and Fluid Mechanics Capabilities Engineering Computation and Design Engineering and Structural Mechanics Systems/Component Design, Engineering and Drafting Heat Transfer and Fluid Mechanics Overview Thermal Hydraulic Optimization of Nuclear Systems Underhood Thermal Management Combustion Simulations Advanced Model and Methodology Development Multi-physics Reactor Performance and Safety Simulations Other Capabilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Heat Transfer and Fluid Mechanics Bookmark and Share Engineering Simulation Capabilities at Argonne Nuclear Engineering Division The Engineering Simulation section specializes in the development and

207

Accuracy and Efficiency of Determining Urinary Calculi Composition Using Dual-energy Computed Tomography Compared With Hounsfield Unit Measurements for Practicing Physicians  

Science Journals Connector (OSTI)

Objective To compare speed and accuracy for determining urinary calculi composition between dual-energy computed tomography (DECT) and Hounsfield unit (HU) measurements of calculi by a set of reviewers at varying levels of training and practice. Materials and Methods Sixteen patients with known stone composition were randomly selected. Fourteen reviewers of varying levels of practice interpreted DECT and HU images from the selected patients to predict stone composition in 2 sessions (day 1: tutorial or flow sheet available for image interpretation and day 2: tutorial or flow sheet not available). Reviewers recorded HU values, stone color, and predicted stone composition as they were timed. Accuracy of image interpretation, determination of calculi composition, and interpretation time were compared. Results DECT accuracy: image interpretation 100% (day 1) and 94% (day 2); predicted stone composition: 100% (day 1) and 73% (day 2). Mean interpretation time was the same for both days, 21 seconds per study (range, 11-40seconds). HU accuracy: image interpretation 97% (day 1) and 91% (day 2); predicted stone composition was 45% accurate on both days. Mean interpretation time was 53seconds per study (range, 28-79seconds) and 41 seconds per study (range, 19-71 seconds) on days 1 and 2, respectively. Overall accuracy of determination of stone composition and interpretation time for DECT were essentially double those of the HU images (87% vs 45% and 21 vs 47seconds, respectively). Reviewer's experience level did not affect accuracy or speed. Conclusion DECT is easier to learn, faster to interpret, and more accurate than HU in determining urinarycalculi composition for physicians at various levels of training and practice.

Maria A. Jepperson; El-Sayed H. Ibrahim; Abby Taylor; Joseph G. Cernigliaro; William E. Haley; David D. Thiel

2014-01-01T23:59:59.000Z

208

Acoustic radiation due to a fluid loading discontinuity on an infinite membrane  

Science Journals Connector (OSTI)

Edge?mode radiation is determined for an infinite membrane with a discontinuous fluid loading condition. The upper half of the membrane is exposed to a heavy fluid which accounts for a fluidstructure interaction. The lower half of the membrane is exposed to very light fluid which imposes no fluid loading on the structure. A very soft compliant layer is attached to half of the membrane surface. The compliant layer lessens the local coupling between the fluid and the structure thus creating the fluid loading discontinuity. The effect of this fluid loading discontinuity upon the radiated farfield is evaluated.

Mauro Pierucci

1978-01-01T23:59:59.000Z

209

Mech 521 Fluid Mechanics Project December 6, 2012 Introduction  

E-Print Network (OSTI)

the open source computational fluid dynamics (CFD) package OpenFOAM to computationally examine supersonic and a bow-shock wave is formed in front of the airfoil. Software and Computer Lab: OpenFOAM is an open source CFD package that is freely available and can be downloaded from its web page www.openfoam

Muradoglu, Metin

210

Modelling suspended sediment in environmental turbulent fluids  

E-Print Network (OSTI)

Modelling sediment transport in environmental turbulent fluids is a challenge. This article develops a sound model of the lateral transport of suspended sediment in environmental fluid flows such as floods and tsunamis. The model is systematically derived from a 3D turbulence model based on the Smagorinski large eddy closure. Embedding the physical dynamics into a family of problems and analysing linear dynamics of the system, centre manifold theory indicates the existence of slow manifold parametrised by macroscale variables. Computer algebra then constructs the slow manifold in terms of fluid depth, depth-averaged lateral velocities, and suspended sediment concentration. The model includes the effects of sediment erosion, advection, dispersion, and also the interactions between the sediment and turbulent fluid flow. Vertical distributions of the velocity and concentration in steady flow agree with the established experimental data. Numerical simulations of the suspended sediment under large waves show that ...

Cao, Meng

2014-01-01T23:59:59.000Z

211

Control system for fluid heated steam generator  

DOE Patents (OSTI)

A control system for controlling the location of the nucleate-boiling region in a fluid heated steam generator comprises means for measuring the temperature gradient (change in temperature per unit length) of the heating fluid along the steam generator; means for determining a control variable in accordance with a predetermined function of temperature gradients and for generating a control signal in response thereto; and means for adjusting the feedwater flow rate in accordance with the control signal.

Boland, J.F.; Koenig, J.F.

1984-05-29T23:59:59.000Z

212

Structure and Thermodynamics of Subduction Zone Fluids from Spectroscopic Studies  

Science Journals Connector (OSTI)

...Na2Si2O5-bearing aqueous fluids (NS2 sol.) and hydrous haplogranite melts...pressures and temperatures. Amounts of HCl, NS2 in the fluids, and H2O and fluorine in...Driesner 2013, this volume). Improvement in codes and computational power have allowed to...

Carmen Sanchez-Valle

213

Structural anisotropy and orientation-induced Casimir repulsion in fluids  

E-Print Network (OSTI)

In this work we theoretically consider the Casimir force between two periodic arrays of nanowires (both in vacuum, and on a substrate separated by a fluid) at separations comparable to the period. Specifically, we compute ...

McCauley, Alexander Patrick

214

2005 Pearson Education South Asia Pte Ltd Applied Fluid Mechanics  

E-Print Network (OSTI)

(NPSH) for a pump and discuss its significancein pump performance. 13. Pump Selection and Applications pressure of the fluid in relation to the NPSH. · Compute the NPSH available for a given suction line design

Leu, Tzong-Shyng "Jeremy"

215

Fiber optic fluid detector  

DOE Patents (OSTI)

Particular gases or liquids are detected with a fiber optic element having a cladding or coating of a material which absorbs the fluid or fluids and which exhibits a change of an optical property, such as index of refraction, light transmissiveness or fluoresence emission, for example, in response to absorption of the fluid. The fluid is sensed by directing light into the fiber optic element and detecting changes in the light, such as exit angle changes for example, that result from the changed optical property of the coating material. The fluid detector may be used for such purposes as sensing toxic or explosive gases in the atmosphere, measuring ground water contamination or monitoring fluid flows in industrial processes, among other uses. 10 figs.

Angel, S.M.

1987-02-27T23:59:59.000Z

216

A numerical study on the effects of 2d structured sinusoidal elements on fluid flow and heat transfer at microscale  

E-Print Network (OSTI)

Computational fluid dynamics Microchannel Minichannel Surface roughness Roughness elements Heat transfer Fluid to achieve enhancement in heat transfer with relatively low cooling fluid flow rate [1]. In spite of havingA numerical study on the effects of 2d structured sinusoidal elements on fluid flow and heat

Kandlikar, Satish

217

CX-009561: Categorical Exclusion Determination | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

61: Categorical Exclusion Determination 61: Categorical Exclusion Determination CX-009561: Categorical Exclusion Determination Using Solid Particles as Heat Transfer Fluid for Use in Concentrating Solar Power (CSP) Plants CX(s) Applied: A9 Date: 12/04/2012 Location(s): Colorado Offices(s): Golden Field Office The U.S. DOE is proposing to provide federal funding to the University of Colorado, in partnership with the National Renewable Energy Laboratory to conduct computer based modeling that advances concentrated solar power (CSP) thermal systems. DOE funding would be used for computer based modeling to develop, verify and validate a first-principle modeling tool for use in the optimization, scale-up, and design of a near-blackbody receiver. CX-009561.pdf More Documents & Publications CX-005581: Categorical Exclusion Determination

218

Thermodynamics and Fluids  

Science Journals Connector (OSTI)

... AN important section of the work of modern chemical engineers lies in the application of thermodynamics to problems of fluid systems. This volume, the fourth in the series, is ... properties of physical systems and to the transport properties of fluids. The first section on thermodynamics has been written by Dr. R. Strickland Constable of the Chemical Engineering Department at ...

J. M. COULSON

1958-09-27T23:59:59.000Z

219

Viscosity of isotropic hard particle fluids  

Science Journals Connector (OSTI)

A kinetic theory for the frequency?dependent shear viscosity ?(?) of isotropic fluids composed of non?spherical hard convex bodies is extended in two ways. First the theory is reformulated to allow ?(?) to be expressed directly in terms of matrix elements involving the shear stress tensor rather than in terms of the transverse momentum correlation function. Second relaxation of the antisymmetric component of the stress due to coupling with spin angular momentum is explicitly incorporated; this corrects an error in a previous version of the theory. The revised kinetic theory is compared with computer simulations for hard ellipsoids of revolution of axial ratio 2 3 5 and 10. Both the symmetric and antisymmetric contributions to ?(?) are well reproduced. Coupling with the collective molecular second?rank orientation tensor remains an important factor in determining the variation of ?(?) from high to low frequencies; the prediction of the magnitude of the associated dip in ?(?) is significantly improved. The new version of the theory is also more successful in predicting values of the zero?frequency shear viscosity ? the shear?orientation coupling parameter R and the StokesEinstein (Debye) products D s? and D r?.

Michael P. Allen; Philip J. Camp; Carl P. Mason; Glenn T. Evans; Andrew J. Masters

1996-01-01T23:59:59.000Z

220

Computational Ship Hydrodynamics MOERI Propeller  

E-Print Network (OSTI)

Computational Ship Hydrodynamics MOERI Propeller This area of research is coordinated by the ship 5415 #12;Fluid-Structure Interaction MOERI Propeller 22 Associate force fluid to structure Associate hydrodynamics problems, like slamming and whipping. The code has recently been applied to wind turbine flows

Kusiak, Andrew

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

HYSTERESIS IN A ROTATING DIFFERENTIALLY HEATED SPHERICAL SHELL OF BOUSSINESQ FLUID  

E-Print Network (OSTI)

HYSTERESIS IN A ROTATING DIFFERENTIALLY HEATED SPHERICAL SHELL OF BOUSSINESQ FLUID GREGORY M. LEWIS AND WILLIAM F. LANGFORD Abstract. A mathematical model of convection of a Boussinesq fluid, flow transitions, Boussinesq fluid, flow in a rotating spherical shell, numerical computation, large

Lewis, Greg

222

Computational mechanics  

SciTech Connect

The Computational Mechanics thrust area sponsors research into the underlying solid, structural and fluid mechanics and heat transfer necessary for the development of state-of-the-art general purpose computational software. The scale of computational capability spans office workstations, departmental computer servers, and Cray-class supercomputers. The DYNA, NIKE, and TOPAZ codes have achieved world fame through our broad collaborators program, in addition to their strong support of on-going Lawrence Livermore National Laboratory (LLNL) programs. Several technology transfer initiatives have been based on these established codes, teaming LLNL analysts and researchers with counterparts in industry, extending code capability to specific industrial interests of casting, metalforming, and automobile crash dynamics. The next-generation solid/structural mechanics code, ParaDyn, is targeted toward massively parallel computers, which will extend performance from gigaflop to teraflop power. Our work for FY-92 is described in the following eight articles: (1) Solution Strategies: New Approaches for Strongly Nonlinear Quasistatic Problems Using DYNA3D; (2) Enhanced Enforcement of Mechanical Contact: The Method of Augmented Lagrangians; (3) ParaDyn: New Generation Solid/Structural Mechanics Codes for Massively Parallel Processors; (4) Composite Damage Modeling; (5) HYDRA: A Parallel/Vector Flow Solver for Three-Dimensional, Transient, Incompressible Viscous How; (6) Development and Testing of the TRIM3D Radiation Heat Transfer Code; (7) A Methodology for Calculating the Seismic Response of Critical Structures; and (8) Reinforced Concrete Damage Modeling.

Goudreau, G.L.

1993-03-01T23:59:59.000Z

223

Topological Quantum Computation and Error Correction by Biological Cells  

E-Print Network (OSTI)

A Topological examination of phospholipid dynamics in the Far from Equilibrium state has demonstrated that metabolically active cells use waste heat to generate spatially patterned membrane flows by forced convection and shear. This paper explains the resemblance between this nonlinear membrane model and Witten Kitaev type Topological Quantum Computation systems, and demonstrates how this self-organising membrane enables biological cells to circumvent the decoherence problem, perform error correction procedures, and produce classical level output as shielded current flow through cytoskeletal protein conduit. Cellular outputs are shown to be Turing compatible as they are determined by computable in principle hydromagnetic fluid flows, and importantly, are Adaptive from an Evolutionary perspective.

J T Lofthouse

2005-02-02T23:59:59.000Z

224

Viscosity of a one-component polarizable fluid  

Science Journals Connector (OSTI)

The viscosity of a one-component polarizable fluid in an electric field is studied by computer simulations. The fluid viscosity increases with the field through three stages. In a weak field, the fluid remains Newtonian, although its viscosity increases. At this stage, while drifting in the flow direction, particles diffuse in the direction perpendicular to the flow. In an intermediate electric field, the fluid has tilted and broken chains moving with the flow and the fluid becomes non-Newtonian. The viscosity ? and the shear rate ?? have the relationship ?=?0e-???, where ? is the relaxation time and ?0 is exponentially proportional to the dipolar interaction energy and the volume fraction. In a strong electric field, the fluid contains condensed chains that provide yield stress and hysteresis.

J. M. Sun and R. Tao

1995-07-01T23:59:59.000Z

225

Circular hydraulic jump in generalized-Newtonian fluids  

E-Print Network (OSTI)

We carry out an analytical study of laminar circular hydraulic jumps, in generalized-Newtonian fluids obeying the two-parametric power-law model of Ostwald-de Waele. Under the boundary-layer approximation we obtained exact expressions determining the flow, an implicit relation for the jump radius is derived. Corresponding results for Newtonian fluids can be retrieved as a limiting case for the flow behavior index n=1, predictions are made for fluids deviating from Newtonian behavior.

Rai, Ashutosh; Poria, Swarup

2008-01-01T23:59:59.000Z

226

Fluid sampling tool  

DOE Patents (OSTI)

A fluid sampling tool is described for sampling fluid from a container. The tool has a fluid collecting portion which is drilled into the container wall, thereby affixing it to the wall. The tool may have a fluid extracting section which withdraws fluid collected by the fluid collecting section. The fluid collecting section has a fluted shank with an end configured to drill a hole into a container wall. The shank has a threaded portion for tapping the borehole. The shank is threadably engaged to a cylindrical housing having an inner axial passageway sealed at one end by a septum. A flexible member having a cylindrical portion and a bulbous portion is provided. The housing can be slid into an inner axial passageway in the cylindrical portion and sealed to the flexible member. The bulbous portion has an outer lip defining an opening. The housing is clamped into the chuck of a drill, the lip of the bulbous section is pressed against a container wall until the shank touches the wall, and the user operates the drill. Wall shavings (kerf) are confined in a chamber formed in the bulbous section as it folds when the shank advances inside the container. After sufficient advancement of the shank, an o-ring makes a seal with the container wall. 6 figs.

Garcia, A.R.; Johnston, R.G.; Martinez, R.K.

1999-05-25T23:59:59.000Z

227

IDENTIFYING FRACTURES AND FLUID TYPES USING FLUID INCLUSION STRATIGRAPHY |  

Open Energy Info (EERE)

IDENTIFYING FRACTURES AND FLUID TYPES USING FLUID INCLUSION STRATIGRAPHY IDENTIFYING FRACTURES AND FLUID TYPES USING FLUID INCLUSION STRATIGRAPHY Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: IDENTIFYING FRACTURES AND FLUID TYPES USING FLUID INCLUSION STRATIGRAPHY Details Activities (1) Areas (1) Regions (0) Abstract: Fluid Inclusion Stratigraphy (FIS) is a method currently being developed for use in geothermal systems to identify fractures and fluid types. This paper is the third in a series of papers on the development of FIS. Fluid inclusion gas chemistry is analyzed and plotted on well log diagrams. The working hypothesis is that select gaseous species and species ratios indicate areas of groundwater and reservoir fluid flow and reservoir seals. Previously we showed that FIS analyses identify fluid types and

228

CX-009846: Categorical Exclusion Determination | Department of...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Evaluation of existing procedures and development of new methods for determination of the porosity and permeability of shales in the presence of reservoir fluids, stimulation...

229

Multiphase fluid characterization system  

DOE Patents (OSTI)

A measurement system and method for permitting multiple independent measurements of several physical parameters of multiphase fluids flowing through pipes are described. Multiple acoustic transducers are placed in acoustic communication with or attached to the outside surface of a section of existing spool (metal pipe), typically less than 3 feet in length, for noninvasive measurements. Sound speed, sound attenuation, fluid density, fluid flow, container wall resonance characteristics, and Doppler measurements for gas volume fraction may be measured simultaneously by the system. Temperature measurements are made using a temperature sensor for oil-cut correction.

Sinha, Dipen N.

2014-09-02T23:59:59.000Z

230

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS Int. J. Numer. Meth. Fluids (2010)  

E-Print Network (OSTI)

based on anisotropic mesh adaptation for solving two-fluid flows Thi Thu Cuc Bui1,,, P. Frey1,2 and B of the computational domain in the vicinity of the interface for better accuracy. Copyright 2010 John Wiley & Sons, Ltd@ann.jussieu.fr Contract/grant sponsor: French Centre National de la Recherche Scientifique Copyright 2010 John Wiley

Frey, Pascal

231

Thermal Fluid Multiphysics Optimization of Spherical Tokamak  

SciTech Connect

An experimental Fusion Nuclear Science Facility (FNSF) is required that will create the environment that simultaneously achieves high energy neutrons and high ion fluence necessary in order to bridge the gaps from ITER to the realization of a fusion nuclear power plant. One concept for achieving this is a high duty cycle spherical torus. This study will focus on thermal modeling of the spherical torus centerpost using computational fluid dynamics to effectively model the thermal transfer of the cooling fluid to the centerpost. The design of the fluid channels is optimized in order to minimize the temperature in the centerpost. Results indicate the feasibility of water cooling for a long-pulse spherical torus FNSF.

Lumsdaine, Arnold [ORNL; Tipton, Joseph B [ORNL; Peng, Yueng Kay Martin [ORNL

2012-01-01T23:59:59.000Z

232

Computer resources Computer resources  

E-Print Network (OSTI)

Computer resources 1 Computer resources available to the LEAD group Cédric David 30 September 2009 #12;Ouline · UT computer resources and services · JSG computer resources and services · LEAD computers· LEAD computers 2 #12;UT Austin services UT EID and Password 3 https://utdirect.utexas.edu #12;UT Austin

Yang, Zong-Liang

233

Fluid pumping apparatus  

DOE Patents (OSTI)

A method and apparatus suitable for coupling seismic or other downhole sensors to a borehole wall in high temperature and pressure environments. In one embodiment, one or more metal bellows mounted to a sensor module are inflated to clamp the sensor module within the borehole and couple an associated seismic sensor to a borehole wall. Once the sensing operation is complete, the bellows are deflated and the sensor module is unclamped by deflation of the metal bellows. In a further embodiment, a magnetic drive pump in a pump module is used to supply fluid pressure for inflating the metal bellows using borehole fluid or fluid from a reservoir. The pump includes a magnetic drive motor configured with a rotor assembly to be exposed to borehole fluid pressure including a rotatable armature for driving an impeller and an associated coil under control of electronics isolated from borehole pressure.

West, Phillip B. (Idaho Falls, ID)

2006-01-17T23:59:59.000Z

234

Basic fluid system trainer  

DOE Patents (OSTI)

A trainer, mounted and housed within a mobile console, is used to teach and reinforce fluid principles to students. The system trainer has two centrifugal pumps, each driven by a corresponding two-speed electric motor. The motors are controlled by motor controllers for operating the pumps to circulate the fluid stored within a supply tank through a closed system. The pumps may be connected in series or in parallel. A number of valves are also included within the system to effect different flow paths for the fluid. In addition, temperature and pressure sensing instruments are installed throughout the closed system for measuring the characteristics of the fluid, as it passes through the different valves and pumps. These measurements are indicated on a front panel mounted to the console, as a teaching aid, to allow the students to observe the characteristics of the system.

Semans, Joseph P. (Uniontown, PA); Johnson, Peter G. (Pittsburgh, PA); LeBoeuf, Jr., Robert F. (Clairton, PA); Kromka, Joseph A. (Idaho Falls, ID); Goron, Ronald H. (Connellsville, PA); Hay, George D. (Venetia, PA)

1993-01-01T23:59:59.000Z

235

Statistical mechanics of simple fluids: beyond van der Waals  

E-Print Network (OSTI)

to Sir John Lennard-Jones. In this comparison computers play a central part. By computer simulation we of his, is a senior scientist with Systems, Science and Software, in San Diego, Cal. theory,1 particularly for very dense fluids, for which we now have approximations to the free energy and structure

Lebowitz, Joel

236

Novel Application of X-ray Computed Tomography:? Determination of Gas/Liquid Contact Area and Liquid Holdup in Structured Packing  

Science Journals Connector (OSTI)

Figure 7 Flow system used with GE X-ray CT scanner:? from left, air?water column, water pump, and cart containing flow meters. ... In Figure 24, the results of experimental holdup measurements on the column used for imaging are compared with SRP data from the hydraulic testing of Mellapak 250Y. ... The two-fluid model proved powerful in the prediction of the column hydraulics under various operational conditions such as atm. ...

Christian W. Green; John Farone; Julie K. Briley; R. Bruce Eldridge; Richard A. Ketcham; Ben Nightingale

2007-07-24T23:59:59.000Z

237

Different approximations of shallow fluid flow over an obstacle  

SciTech Connect

Three different sets of shallow water equations, representing different levels of approximation are considered. The numerical solutions of these different equations for flow past bottom topography in several different flow regimes are compared. For several cases the full Euler solutions are computed as a reference, allowing the assessment of the relative accuracies of the different approximations. Further, the differences between the dispersive shallow water (DSW) solutions and those of the highly simplified, hyperbolic shallow water (SW) equations is studied as a guide to determining what level of approximation is required for a particular flow. First, the Green-Naghdi (GN) equations are derived as a vertically-integrated rational approximation of the Euler equations, and then the generalized Boussinesq (gB) equations are obtained under the further assumption of weak nonlinearity. A series of calculations, each assuming different values of a set of parameters{emdash}undisturbed upstream Froude number, and the height and width of the obstacle, are then presented and discussed. In almost all regions of the parameter space, the SW and DSW theories yield different results; it is only when the flows are entirely subcritical or entirely supercritical and when the obstacles are very wide compared to the depth of the fluid that the SW and DSW theories are in qualitative and quantitative agreement. It is also found that while the gB solutions are accurate only for small bottom topographies (less than 20{percent} of the undisturbed fluid depth), the GN solutions are accurate for much larger topographies (up to 65{percent} of the undisturbed fluid depth). The limitation of the gB approximation to small topographies is primarily due to the generation of large amplitude upstream propagating solitary waves at transcritical Froude numbers, and is consistent with previous analysis. (Abstract Truncated)

Nadiga, B.T.; Margolin, L.G. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Smolarkiewicz, P.K. [National Center for Atmospheric Research, Boulder, Colorado 80307 (United States)] [National Center for Atmospheric Research, Boulder, Colorado 80307 (United States)

1996-08-01T23:59:59.000Z

238

Fluid Inclusion Analysis At Coso Geothermal Area (2004) | Open Energy  

Open Energy Info (EERE)

Fluid Inclusion Analysis At Coso Geothermal Area Fluid Inclusion Analysis At Coso Geothermal Area (2004) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Fluid Inclusion Analysis Activity Date 2004 Usefulness not indicated DOE-funding Unknown Exploration Basis 1) To determine if analyses of fluid propene and propane species in fluid inclusions can be used to interpret fluid type, history, or process. 2) To evaluate the geology and thermal history of the East Flank, in order to better understand how the rocks will behave during hydro-fracturing. Notes 1) Analyses were performed on drill cuttings at 20ft intervals from four Coso geothermal wells. Two wells are good producers, one has cold-water entrants in the production zone, and the fourth is a non-producer. The ratios show distinct differences between producing and the non-producing

239

Gender determination of avian embryo  

DOE Patents (OSTI)

Disclosed is a method for gender determination of avian embryos. During the embryo incubation process, the outer hard shells of eggs are drilled and samples of allantoic fluid are removed. The allantoic fluids are directly introduced into an ion mobility spectrometer (IMS) for analysis. The resulting spectra contain the relevant marker peaks in the positive or negative mode which correlate with unique mobilities which are sex-specific. This way, the gender of the embryo can be determined.

Daum, Keith A. (Idaho Falls, ID); Atkinson, David A. (Idaho Falls, ID)

2002-01-01T23:59:59.000Z

240

The Geometric Structure of Complex Fluids  

E-Print Network (OSTI)

This paper develops the theory of affine Euler-Poincar\\'e and affine Lie-Poisson reductions and applies these processes to various examples of complex fluids, including Yang-Mills and Hall magnetohydrodynamics for fluids and superfluids, spin glasses, microfluids, and liquid crystals. As a consequence of the Lagrangian approach, the variational formulation of the equations is determined. On the Hamiltonian side, the associated Poisson brackets are obtained by reduction of a canonical cotangent bundle. A Kelvin-Noether circulation theorem is presented and is applied to these examples.

Franois Gay-Balmaz; Tudor S. Ratiu

2009-03-25T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

The effect of lymphatic fluid protein concentration on lymphatic resistance  

E-Print Network (OSTI)

were manipulated by altering the height of the outflow port. Two fluids - lactated Ringers solution and 6% albumin in lactated Ringers solution - were introduced alternately into the vessels. Flow through the vessel was determined for several pressure...

Walker, Ellen Marie

2013-02-22T23:59:59.000Z

242

Sources Of Chloride In Hydrothermal Fluids From The Valles Caldera...  

Open Energy Info (EERE)

in and around the caldera. In order to determine the fluid pathways and the origin of chloride in this system, we measured 36ClCl ratios in waters from high-temperature...

243

Development of an analytical model for organic-fluid fouling  

SciTech Connect

The research goal of this project is to determine ways to effectively mitigate fouling in organic fluids: hydrocarbons and derived fluids. The fouling research focuses on the development of methodology for determining threshold conditions for fouling. Initially, fluid containing chemicals known to produce foulant is analyzed; subsequently, fouling of industrial fluids is investigated. The fouling model developed for determining the effects of physical parameters is the subject of this report. The fouling model is developed on the premise that the chemical reaction for generation of precursor can take place in the bulk fluid, in the thermal-boundary layer, or at the fluid/wall interface, depending upon the interactive effects of fluid dynamics, heat and mass transfer, and the controlling chemical reaction. In the analysis, the experimental data are examined for fouling deposition of polyperoxide produced by autoxidation of indene in kerosene. The effects of fluid and wall temperatures for two flow geometries are analyzed. The results show that the relative effects of physical parameters on the fouling rate differ for the three fouling mechanisms. Therefore, to apply the closed-flow-loop data to industrial conditions, the controlling mechanism must be identified.

Panchal, C.B.; Watkinson, A.P.

1994-10-01T23:59:59.000Z

244

Computer Abstractions and Technology  

E-Print Network (OSTI)

& wheel Supersedes roller-ball mechanical mouse #12;Chapter 1 -- Computer Abstractions and Technology to building sized Embedded computers Hidden as components of systems Stringent power of machine instructions executed per operation Processor and memory system Determine how fast instructions

Huang, Chun-Hsi

245

Determination of time-course change rate for arterial xenon using the time course of tissue xenon concentration in xenon-enhanced computed tomography  

SciTech Connect

In calculating tissue blood flow (TBF) according to the Fick principle, time-course information on arterial tracer concentration is indispensable and has a considerable influence on the accuracy of calculated TBF. In TBF measurement by xenon-enhanced computed tomography (Xe-CT), nonradioactive xenon gas is administered by inhalation as a tracer, and end-tidal xenon is used as a substitute for arterial xenon. There has been the assumption that the time-course change rate for end-tidal xenon concentration (Ke) and that for arterial xenon concentration (Ka) are substantially equal. Respiratory gas sampling is noninvasive to the patient and Ke can be easily measured by exponential curve fitting to end-tidal xenon concentrations. However, it is pointed out that there would be a large difference between Ke and Ka in many cases. The purpose of this work was to develop a method of determining the Ka value using the time course of tissue xenon concentration in Xe-CT. The authors incorporated Ka into the Kety autoradiographic equation as a parameter to be solved, and developed a method of least-squares to obtain the solution for Ka from the time-course changes in xenon concentration in the tissue. The authors applied this method of least-squares to the data from Xe-CT abdominal studies performed on 17 patients; the solution for Ka was found pixel by pixel in the spleen, and its Ka map was created for each patient. On the one hand, the authors obtained the average value of the Ka map of the spleen as the calculated Ka (Ka{sub calc}) for each patient. On the other hand, the authors measured Ka (Ka{sub meas}) using the time-course changes in CT enhancement in the abdominal aorta for each patient. There was a good correlation between Ka{sub calc} and Ka{sub meas} (r=0.966, P<0.0001), and these two Ka values were close to each other (Ka{sub calc}=0.935xKa{sub meas}+0.089). This demonstrates that Ka{sub calc} would be close to the true Ka value. Accuracy of TBF by Xe-CT can be improved with use of the average value of the Ka map of an organ like the spleen that has a single blood supply (only arterial inflow)

Sase, Shigeru; Takahashi, Hideaki; Ikeda, Hiroki; Kobayashi, Minoru; Matsumoto, Nobuyuki; Suzuki, Michihiro [Anzai Medical Co., Ltd., 3-9-15 Nishi-Shinagawa, Shinagawa-ku, Tokyo 141-0033 (Japan); Department of Internal Medicine, Division of Gastroenterology and Hepatology, School of Medicine, St. Marianna University, 2-16-1 Miyamae-ku, Sugao, Kawasaki 216-5811 (Japan)

2008-06-15T23:59:59.000Z

246

Fluid driven reciprocating apparatus  

DOE Patents (OSTI)

An apparatus is described comprising a pair of fluid driven pump assemblies in a back-to-back configuration to yield a bi-directional pump. Each of the pump assemblies includes a piston or diaphragm which divides a chamber therein to define a power section and a pumping section. An intake-exhaust valve is connected to each of the power sections of the pump chambers, and function to direct fluid, such as compressed air, into the power section and exhaust fluid therefrom. At least one of the pistons or diaphragms is connected by a rod assembly which is constructed to define a signal valve, whereby the intake-exhaust valve of one pump assembly is controlled by the position or location of the piston or diaphragm in the other pump assembly through the operation of the rod assembly signal valve. Each of the pumping sections of the pump assemblies are provided with intake and exhaust valves to enable filling of the pumping section with fluid and discharging fluid therefrom when a desired pressure has been reached. 13 figs.

Whitehead, J.C.

1997-04-01T23:59:59.000Z

247

A new type of whole oil-based drilling fluid  

Science Journals Connector (OSTI)

Abstract To meet the demand of ultra-deep well drilling and shale gas well drilling, organic clay and a oil-based filtrate reducer were developed and a whole oil-based drilling fluid formula was optimized. The performance of organic clay, oil-based filtrate reducer and the whole oil-based drilling fluid were evaluated in laboratory, and the whole oil-based drilling fluid was applied in drilling process for further test of its performance. Long carbon chain quaternary ammonium salt was used as modifying agents when synthesizing organobentonites. Oil-based filtrate reducer was synthesized with monomers of lignite and amine class. The laboratory tests show that the organic clay can effectively increase the viscosity of oil-based drilling fluid and the oil-based filtrate reducer can reduce the fluid loss. Their performances were better than additives of the same kind at home and abroad. The organic clay and oil-based filtrate reducer had great compatibility with the other additives in oil-based drilling fluid. Based on the optimal additives addition amount tests, the whole oil-based drilling fluid formula was determined and the test results show that the performances of the whole oil-based drilling fluids with various densities were great. The laboratory tests show that the oil-based drilling fluid developed was high temperature resistant, even at 200 C, as density varies from 0.90 to 2.0 g/cm3, it still held good performance with only a little fluid loss, good inhibition, great anti-pollution, and good reservoir protection performance. Field application result shows that the performance of the oil-based drilling fluid is stable with great ability to maintain wellbore stability and lower density than the water-based drilling fluid; drilling bits can be used much longer and the average penetration rate is increased; the oil-based drilling fluid can satisfy the drilling requirements.

Jiancheng LI; Peng YANG; Jian GUAN; Yande SUN; Xubing KUANG; Shasha CHEN

2014-01-01T23:59:59.000Z

248

View dependent fluid dynamics  

E-Print Network (OSTI)

VIEW DEPENDENT FLUID DYNAMICS A Thesis by BRIAN ARTHUR BARRAN Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE May 2006 Major Subject: Visualization... Sciences VIEW DEPENDENT FLUID DYNAMICS A Thesis by BRIAN ARTHUR BARRAN Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved by: Chair of Committee, Donald...

Barran, Brian Arthur

2006-08-16T23:59:59.000Z

249

Lattice Boltzmann scheme for fluids with dynamic heterogeneities  

Science Journals Connector (OSTI)

We introduce and discuss a three-dimensional mesoscopic lattice Boltzmann model for the numerical simulation of strongly-interacting fluids with dynamic inhomogeneities. The model is based on an extension of the standard lattice Boltzmann dynamics in which streaming between neighboring lattice sites is constrained by the value of the nonlocal density of the surrounding fluid. The resulting dynamics exhibits typical features of dynamically heterogeneous fluids, such as long-time relaxation, non-Gaussian density distributions and dynamic heterogeneities. Due to its intrinsically parallel dynamics and absence of statistical noise, the method is expected to compute significantly faster than molecular dynamics, Monte Carlo, and lattice glass models.

A. Lamura and S. Succi

2006-06-28T23:59:59.000Z

250

CX-001057: Categorical Exclusion Determination | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

057: Categorical Exclusion Determination 057: Categorical Exclusion Determination CX-001057: Categorical Exclusion Determination Characterizing Fractures in Geyser's Geothermal Field by Micro-Seismic Data, Using Soft Computing, Fractals, and Shear Wave Anisotropy CX(s) Applied: A9 Date: 03/10/2010 Location(s): California Office(s): Energy Efficiency and Renewable Energy, Golden Field Office The University of Southern California is proposing a project to predict characteristics of fractures and their orientation prior to drilling new wells. The project will also focus on determining the location of the fractures, fracture spacing and orientation during drilling as well as characterizing open fractures after stimulation to help the location of fluid flow pathways within the Enhanced Geothermal System reservoir.

251

Fluid Inclusion Analysis At Coso Geothermal Area (2004-2005) | Open Energy  

Open Energy Info (EERE)

Fluid Inclusion Analysis At Coso Geothermal Area (2004-2005) Fluid Inclusion Analysis At Coso Geothermal Area (2004-2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Fluid Inclusion Analysis At Coso Geothermal Area (2004-2005) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Fluid Inclusion Analysis Activity Date 2004 - 2005 Usefulness useful DOE-funding Unknown Exploration Basis Determine if fluid inclusion stratigraphy is applicable to geothermal Notes Fluid Inclusion Stratigraphy (FIS) is a new technique developed for the oil industry in order to map borehole fluids.Fluid inclusion gas geochemistry is analyzed and plotted on well log diagrams. The working hypothesis is that select gaseous species and species ratios indicate areas of groundwater and reservoir fluid flow and reservoir seals. Analyses from

252

Computers and Computer Networks  

NLE Websites -- All DOE Office Websites (Extended Search)

and Computer Networks and Computer Networks Computer Science documentation, etc. Computer Science Research and Services at the Lab Super Computing Computer Graphics Computer & Internet information via yahoo.com, categorized by subject Perl UNIX documentation Shareware sites MBONE and Videoconferencing Computer Networks and related documentation Computer Documentation World Wide Web UNIX Documentation TeX, LaTeX FAQ, documents, archives, etc. MacInTouch -- current Macintosh information, from vendor & others Shareware sites The Free On-line Dictionary of Computing PDS: The Performance Database Server of Computer Benchmark Return to Top Return to Top Newsgroups, USEnet, and Mailing Lists Usenet (Internet News Groups) Mailing list software & information Return to Top Return to Top

253

TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID...  

Open Energy Info (EERE)

TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID-INCLUSION GAS CHEMISTRY Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings:...

254

Circulating fluidized bed hydrodynamics experiments for the multiphase fluid dynamics research consortium (MFDRC).  

SciTech Connect

An experimental program was conducted to study the multiphase gas-solid flow in a pilot-scale circulating fluidized bed (CFB). This report describes the CFB experimental facility assembled for this program, the diagnostics developed and/or applied to make measurements in the riser section of the CFB, and the data acquired for several different flow conditions. Primary data acquired included pressures around the flow loop and solids loadings at selected locations in the riser. Tomographic techniques using gamma radiation and electrical capacitance were used to determine radial profiles of solids volume fraction in the riser, and axial profiles of the integrated solids volume fraction were produced. Computer Aided Radioactive Particle Tracking was used to measure solids velocities, fluxes, and residence time distributions. In addition, a series of computational fluid dynamics simulations was performed using the commercial code Arenaflow{trademark}.

Oelfke, John Barry; Torczynski, John Robert; O'Hern, Timothy John; Tortora, Paul Richard; Bhusarapu, Satish (; ); Trujillo, Steven Mathew

2006-08-01T23:59:59.000Z

255

Relativistic viscoelastic fluid mechanics  

SciTech Connect

A detailed study is carried out for the relativistic theory of viscoelasticity which was recently constructed on the basis of Onsager's linear nonequilibrium thermodynamics. After rederiving the theory using a local argument with the entropy current, we show that this theory universally reduces to the standard relativistic Navier-Stokes fluid mechanics in the long time limit. Since effects of elasticity are taken into account, the dynamics at short time scales is modified from that given by the Navier-Stokes equations, so that acausal problems intrinsic to relativistic Navier-Stokes fluids are significantly remedied. We in particular show that the wave equations for the propagation of disturbance around a hydrostatic equilibrium in Minkowski space-time become symmetric hyperbolic for some range of parameters, so that the model is free of acausality problems. This observation suggests that the relativistic viscoelastic model with such parameters can be regarded as a causal completion of relativistic Navier-Stokes fluid mechanics. By adjusting parameters to various values, this theory can treat a wide variety of materials including elastic materials, Maxwell materials, Kelvin-Voigt materials, and (a nonlinearly generalized version of) simplified Israel-Stewart fluids, and thus we expect the theory to be the most universal description of single-component relativistic continuum materials. We also show that the presence of strains and the corresponding change in temperature are naturally unified through the Tolman law in a generally covariant description of continuum mechanics.

Fukuma, Masafumi; Sakatani, Yuho [Department of Physics, Kyoto University, Kyoto 606-8502 (Japan)

2011-08-15T23:59:59.000Z

256

Metallization of fluid hydrogen  

Science Journals Connector (OSTI)

...P. Tunstall Metallization of fluid hydrogen W. J. Nellis 1 A. A. Louis 2 N...The electrical resistivity of liquid hydrogen has been measured at the high dynamic...which structural changes are paramount. hydrogen|metallization of hydrogen|liquid...

1998-01-01T23:59:59.000Z

257

7-55E An office that is being cooled adequately by a 12,000 Btu/h window air-conditioner is converted to a computer room. The number of additional air-conditioners that need to be installed is to be determined.  

E-Print Network (OSTI)

is to be determined. Assumptions 1 The computers are operated by 4 adult men. 2 The computers consume 40 percent to the amount of electrical energy they consume. Therefore, AC Outside Computer room 4000 Btu/h ( ( ) ( Q Q Q Q. Analysis The unit that will cost less during its lifetime is a better buy. The total cost of a system

Bahrami, Majid

258

Magnetically stimulated fluid flow patterns  

ScienceCinema (OSTI)

Sandia National Laboratories' Jim Martin and Kyle Solis explain research on the effects of magnetic fields on fluid flows and how they stimulate vigorous flows. Fluid flow is a necessary phenomenon in everything from reactors to cooling engines in cars.

Martin, Jim; Solis, Kyle

2014-08-06T23:59:59.000Z

259

Device and method for measuring multi-phase fluid flow in a conduit using an elbow flow meter  

DOE Patents (OSTI)

A system for measuring fluid flow in a conduit. The system utilizes pressure transducers disposed generally in line upstream and downstream of the flow of fluid in a bend in the conduit. Data from the pressure transducers is transmitted to a microprocessor or computer. The pressure differential measured by the pressure transducers is then used to calculate the fluid flow rate in the conduit. Control signals may then be generated by the microprocessor or computer to control flow, total fluid dispersed, (in, for example, an irrigation system), area of dispersal or other desired effect based on the fluid flow in the conduit.

Ortiz, Marcos G. (Idaho Falls, ID); Boucher, Timothy J. (Helena, MT)

1997-01-01T23:59:59.000Z

260

Device and method for measuring multi-phase fluid flow in a conduit using an elbow flow meter  

DOE Patents (OSTI)

A system is described for measuring fluid flow in a conduit. The system utilizes pressure transducers disposed generally in line upstream and downstream of the flow of fluid in a bend in the conduit. Data from the pressure transducers is transmitted to a microprocessor or computer. The pressure differential measured by the pressure transducers is then used to calculate the fluid flow rate in the conduit. Control signals may then be generated by the microprocessor or computer to control flow, total fluid dispersed, (in, for example, an irrigation system), area of dispersal or other desired effect based on the fluid flow in the conduit. 2 figs.

Ortiz, M.G.; Boucher, T.J.

1997-06-24T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Apparatus for characterizing the temporo-spatial properties of a dynamic fluid front and method thereof  

DOE Patents (OSTI)

Methods and apparatus are described for characterizing the temporal-spatial properties of a dynamic fluid front within a mold space while the mold space is being filled with fluid. A method includes providing a mold defining a mold space and having one or more openings into the mold space; heating a plurality of temperature sensors that extend into the mold space; injecting a fluid into the mold space through the openings, the fluid experiencing a dynamic fluid front while filling the mold space with the fluid; and characterizing temporal-spatial properties of the dynamic fluid front by monitoring a temperature of each of the plurality of heated temperature sensors while the mold space is being filled with the fluid. An apparatus includes a mold defining a mold space; one or more openings for introducing a fluid into the mold space and filling the mold space with the fluid, the fluid experiencing a dynamic fluid front while filling the mold space; a plurality of heated temperature sensors extending into the mold space; and a computer coupled to the plurality of heated temperature sensors for characterizing the temporal-spatial properties of the dynamic fluid front.

Battiste, Richard L. (Oak Ridge, TN)

2007-12-25T23:59:59.000Z

262

Computing Frontier: Distributed Computing  

NLE Websites -- All DOE Office Websites (Extended Search)

Computing Computing Frontier: Distributed Computing and Facility Infrastructures Conveners: Kenneth Bloom 1 , Richard Gerber 2 1 Department of Physics and Astronomy, University of Nebraska-Lincoln 2 National Energy Research Scientific Computing Center (NERSC), Lawrence Berkeley National Laboratory 1.1 Introduction The field of particle physics has become increasingly reliant on large-scale computing resources to address the challenges of analyzing large datasets, completing specialized computations and simulations, and allowing for wide-spread participation of large groups of researchers. For a variety of reasons, these resources have become more distributed over a large geographic area, and some resources are highly specialized computing machines. In this report for the Snowmass Computing Frontier Study, we consider several questions about distributed computing

263

Isotopic Analysis- Fluid At Coso Geothermal Area (2007) | Open Energy  

Open Energy Info (EERE)

Isotopic Analysis- Fluid At Coso Geothermal Area (2007) Isotopic Analysis- Fluid At Coso Geothermal Area (2007) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Coso Geothermal Area (2007) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Isotopic Analysis- Fluid Activity Date 2007 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine the location of the heat source Notes Fluids have been sampled from 9 wells and 2 fumaroles from the East Flank of the Coso hydrothermal system with a view to identifying, if possible, the location and characteristics of the heat source inflows into this portion of the geothermal field. Preliminary results show that there has been extensive vapor loss in the system, most probably in response to

264

Aqueous absorption fluids. Annual report, July 1988-June 1989  

SciTech Connect

This report describes the second year of study of aqueous-based working fluids that allow for air-cooled absorption chiller operation. The successful development of such fluids will eliminate the need for cooling towers in gas-fired chiller equipment for residential and unitary markets and possibly allow for building heating with absorber heat. Based on experimental results, a single primary candidate working fluid was selected for further study. The fluid was found to exhibit a potential absorber temperature increase of 10 C (18 F) or more. Apparatus for the determination of specific heat capacity, thermal conductivity and absorber-film heat-transfer coefficient was constructed. The equilibrium vapor pressure and specific heat capacity of the primary candidate fluid were measured as a function of temperature and concentration.

Langeliers, J.

1989-07-01T23:59:59.000Z

265

Oscillating fluid power generator  

SciTech Connect

A system and method for harvesting the kinetic energy of a fluid flow for power generation with a vertically oriented, aerodynamic wing structure comprising one or more airfoil elements pivotably attached to a mast. When activated by the moving fluid stream, the wing structure oscillates back and forth, generating lift first in one direction then in the opposite direction. This oscillating movement is converted to unidirectional rotational movement in order to provide motive power to an electricity generator. Unlike other oscillating devices, this device is designed to harvest the maximum aerodynamic lift forces available for a given oscillation cycle. Because the system is not subjected to the same intense forces and stresses as turbine systems, it can be constructed less expensively, reducing the cost of electricity generation. The system can be grouped in more compact clusters, be less evident in the landscape, and present reduced risk to avian species.

Morris, David C

2014-02-25T23:59:59.000Z

266

Electromagnetic Radiations as a Fluid Flow  

E-Print Network (OSTI)

We combine Maxwell's equations with Eulers's equation, related to a velocity field of an immaterial fluid, where the density of mass is replaced by a charge density. We come out with a differential system able to describe a relevant quantity of electromagnetic phenomena, ranging from classical dipole waves to solitary wave-packets with compact support. The clue is the construction of an energy tensor summing up both the electromagnetic stress and a suitable mass tensor. With this right-hand side, explicit solutions of the full Einstein's equation are computed for a wide class of wave phenomena. Since our electromagnetic waves may behave and interact exactly as a material fluid, they can create vortex structures. We then explicitly analyze some vortex ring configurations and examine the possibility to build a model for the electron.

Daniele Funaro

2009-11-25T23:59:59.000Z

267

Computer Engineering Curriculum Notes  

E-Print Network (OSTI)

1 Computer Engineering Curriculum Notes 2013-2014 Technical Electives Students fulfill 15 credits be assigned to either group A or group B as determined by Computer Engineering program committee. Every year the computer engineering program committee will review the list and may make change(s). Group A (at least 6

Mather, Patrick T.

268

Acoustic concentration of particles in fluid flow  

SciTech Connect

An apparatus for acoustic concentration of particles in a fluid flow includes a substantially acoustically transparent membrane and a vibration generator that define a fluid flow path therebetween. The fluid flow path is in fluid communication with a fluid source and a fluid outlet and the vibration generator is disposed adjacent the fluid flow path and is capable of producing an acoustic field in the fluid flow path. The acoustic field produces at least one pressure minima in the fluid flow path at a predetermined location within the fluid flow path and forces predetermined particles in the fluid flow path to the at least one pressure minima.

Ward, Michael D. (Los Alamos, NM); Kaduchak, Gregory (Los Alamos, NM)

2010-11-23T23:59:59.000Z

269

Calibration method and apparatus for measuring the concentration of components in a fluid  

DOE Patents (OSTI)

A calibration method and apparatus for use in measuring the concentrations of components of a fluid is provided. The measurements are determined from the intensity of radiation over a selected range of radiation wavelengths using peak-to-trough calculations. The peak-to-trough calculations are simplified by compensating for radiation absorption by the apparatus. The invention also allows absorption characteristics of an interfering fluid component to be accurately determined and negated thereby facilitating analysis of the fluid. 7 figures.

Durham, M.D.; Sagan, F.J.; Burkhardt, M.R.

1993-12-21T23:59:59.000Z

270

Calibration method and apparatus for measuring the concentration of components in a fluid  

DOE Patents (OSTI)

A calibration method and apparatus for use in measuring the concentrations of components of a fluid is provided. The measurements are determined from the intensity of radiation over a selected range of radiation wavelengths using peak-to-trough calculations. The peak-to-trough calculations are simplified by compensating for radiation absorption by the apparatus. The invention also allows absorption characteristics of an interfering fluid component to be accurately determined and negated thereby facilitating analysis of the fluid.

Durham, Michael D. (Castle Rock, CO); Sagan, Francis J. (Lakewood, CO); Burkhardt, Mark R. (Denver, CO)

1993-01-01T23:59:59.000Z

271

Introduction to finite-difference methods for numerical fluid dynamics  

SciTech Connect

This work is intended to be a beginner`s exercise book for the study of basic finite-difference techniques in computational fluid dynamics. It is written for a student level ranging from high-school senior to university senior. Equations are derived from basic principles using algebra. Some discussion of partial-differential equations is included, but knowledge of calculus is not essential. The student is expected, however, to have some familiarity with the FORTRAN computer language, as the syntax of the computer codes themselves is not discussed. Topics examined in this work include: one-dimensional heat flow, one-dimensional compressible fluid flow, two-dimensional compressible fluid flow, and two-dimensional incompressible fluid flow with additions of the equations of heat flow and the {Kappa}-{epsilon} model for turbulence transport. Emphasis is placed on numerical instabilities and methods by which they can be avoided, techniques that can be used to evaluate the accuracy of finite-difference approximations, and the writing of the finite-difference codes themselves. Concepts introduced in this work include: flux and conservation, implicit and explicit methods, Lagrangian and Eulerian methods, shocks and rarefactions, donor-cell and cell-centered advective fluxes, compressible and incompressible fluids, the Boussinesq approximation for heat flow, Cartesian tensor notation, the Boussinesq approximation for the Reynolds stress tensor, and the modeling of transport equations. A glossary is provided which defines these and other terms.

Scannapieco, E.; Harlow, F.H.

1995-09-01T23:59:59.000Z

272

CX-001699: Categorical Exclusion Determination | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

9: Categorical Exclusion Determination 9: Categorical Exclusion Determination CX-001699: Categorical Exclusion Determination Novel Multidimensional Tracers for Geothermal lnter-Well Diagnostics CX(s) Applied: B3.1, B3.6, B3.11, A9 Date: 04/19/2010 Location(s): Covina, Colorado Office(s): Energy Efficiency and Renewable Energy, Golden Field Office Power Environmental Energy Research Institute (PEER) would develop a matrix of geothermal tracer and tracer interpretation tools to accurately detect reservoir characteristics including fluid pathways, dynamics, residence time, etc. which could lead to information beyond well-to-well connectivity under geothermal conditions. Laboratory work would be done at PEER Institute's laboratory at 738 Arrow Grand Circle, Covina CA. Computer simulations would be done at the Material and Process Simulation Center

273

CX-007430: Categorical Exclusion Determination | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

30: Categorical Exclusion Determination 30: Categorical Exclusion Determination CX-007430: Categorical Exclusion Determination Innovative Computational Tools for Reducing Exploration Risk Through Integration of Water-rock Interactions and Magnetotelluric Surveys CX(s) Applied: A9, B3.6 Date: 12/01/2011 Location(s): Utah Offices(s): Golden Field Office The University of Utah would utilize DOE and cost share funds to develop the framework and procedures required to relate reservoir permeabilities (from indicators of water-rock ratios), degree and type of clay alteration, and temperature to the electrical resistivities of geothermal systems as recorded by magnetotelluric (MT) surveys. Laboratory work would be conducted in the X-ray diffraction and fluid inclusion laboratories located at the Energy and Geoscience Institute (EGI ), 423 Wakara Way, Research

274

Categorical Exclusion Determinations: B3.6 | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

9, 2010 9, 2010 CX-003051: Categorical Exclusion Determination Irvine Smart Grid Demonstration Project (Only for Subcontractor General Electric's Work in Rochester, New York) CX(s) Applied: B3.6, B5.1 Date: 07/19/2010 Location(s): Rochester, New York Office(s): Electricity Delivery and Energy Reliability, National Energy Technology Laboratory July 19, 2010 CX-003050: Categorical Exclusion Determination Irvine Smart Grid Demonstration Project CX(s) Applied: A9, A11, B3.6, B4.6, B5.1 Date: 07/19/2010 Location(s): Irvine, California Office(s): Electricity Delivery and Energy Reliability, National Energy Technology Laboratory July 19, 2010 CX-003045: Categorical Exclusion Determination Computational Fluid Dynamics (CFD) Simulations of a Regenerative Process for Carbon Dioxide Capture in Advanced Gasification Based Systems

275

Categorical Exclusion Determinations: Fossil Energy | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

July 19, 2010 July 19, 2010 CX-003045: Categorical Exclusion Determination Computational Fluid Dynamics (CFD) Simulations of a Regenerative Process for Carbon Dioxide Capture in Advanced Gasification Based Systems CX(s) Applied: B3.6 Date: 07/19/2010 Location(s): Chicago, Illinois Office(s): Fossil Energy, National Energy Technology Laboratory July 15, 2010 CX-003070: Categorical Exclusion Determination Gas Process Development Unit (GPDU)/Syngas (Synthetic Gas) Generator Decommissioning CX(s) Applied: B1.23, B1.27, B1.31, B3.6 Date: 07/15/2010 Location(s): Morgantown, West Virginia Office(s): Fossil Energy, National Energy Technology Laboratory July 13, 2010 CX-003039: Categorical Exclusion Determination High Temperature Chemical Sensors for Energy Research CX(s) Applied: B3.6

276

The modeling and the simulation of the fluid machines of synthetic biology  

Science Journals Connector (OSTI)

In the past century, several conceptual and technological breakthroughs produced the digital computers and open the digital information age. At the very same time, the Watson --- Crick model of the digital coding of the genetic information was developed. ... Keywords: (DS)2: dynamical systems with a dynamical structure, MGS, computer modeling, domain specific language (DSL), fluid machines, simulation, spatial computing, synthetic biology, topological rewriting

Jean-Louis Giavitto

2011-08-01T23:59:59.000Z

277

Paleotemperatures preserved in fluid inclusions in halite  

SciTech Connect

A variety of paleoclimate proxy records allow determination of relative warming or cooling. However, if we are to understand climate change, quantification of past temperature fluctuations is essential. Our research indicates that fluid inclusions in halite can yield homogenization temperatures that record surface brine temperatures at the time of halite precipitation. To avoid problems with stretching, leaking, and initial trapping of air, samples with primary, single-phase (liquid) fluid inclusions are chilled in a freezer to nucleate vapor bubbles. We tested the reliability of this method of obtaining fluid-inclusion homogenization temperatures using modern salts precipitated at Badwater Basin, Death Valley, California. Homogenization temperatures correlate well with measured brine temperatures. The same method is applied to fluid inclusions in Pleistocene halite from a core taken at the same location in Death Valley. Results are at several scales, recording diurnal temperature variations, seasonal temperature fluctuations, and longer-term warming and cooling events that correlate with major changes in the sedimentary environment related to climate. This technique is uniquely instrumental for paleoclimate studies because it offers actual, not just proxy, paleotemperature data. 27 refs., 17 figs.

Roberts, S.M.; Spencer, R.J. [Univ. of Calgary, Alberta (Canada)] [Univ. of Calgary, Alberta (Canada)

1995-10-01T23:59:59.000Z

278

Can We Accurately Model Fluid Flow in Shale?  

NLE Websites -- All DOE Office Websites (Extended Search)

Can We Accurately Model Fluid Flow Can We Accurately Model Fluid Flow in Shale? Can We Accurately Model Fluid Flow in Shale? Print Thursday, 03 January 2013 00:00 Over 20 trillion cubic meters of natural gas are trapped in shale, but many shale oil and gas producers still use models of underground fluid flow that date back to the heyday of easy-to-tap gas and liquid crude. The source of shale oil and gas is kerogen, an organic material in the shale, but until now kerogen hasn't been incorporated in mathematical models of shale gas reservoirs. Paulo Monteiro, Chris Rycroft, and Grigory Isaakovich Barenblatt, with the Computational Research Division and the Advanced Light Source, recently modeled how pressure gradients in the boundary layer between kerogen inclusions and shale matrices affect productivity and can model reservoir longevity.

279

Aqueous absorption fluids. Annual report, July 1987-June 1988  

SciTech Connect

The report describes the first year of study of aqueous-based working fluids that allow for air-cooled absorption chiller operation. The successful development of such fluids will eliminate the need for cooling towers in gas-fired chiller equipment for residential and unitary markets and possibly allow for building heating with absorbed heat. Several candidate fluids were investigated experimentally, and three were found to exhibit significant potential increases in absorber temperature of 13 to 27 F. Two candidates were retained for further investigation next year. A computer model for a single-stage absorption cycle was developed. The model will predict the cycle performance when additional fluid data from a test sorber are available.

Rockenfeller, U.; Langeliers, J.

1988-07-01T23:59:59.000Z

280

Computational battery dynamics (CBD)--electrochemical/thermal coupled modeling and multi-scale modeling  

E-Print Network (OSTI)

Computational battery dynamics (CBD)--electrochemical/thermal coupled modeling and multi the development of first-principles based mathematical models for batteries developed on a framework parallel to computation fluid dynamics (CFD), herein termed computational battery dynamics (CBD). This general

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Non-contact fluid characterization in containers using ultrasonic waves  

DOE Patents (OSTI)

Apparatus and method for non-contact (stand-off) ultrasonic determination of certain characteristics of fluids in containers or pipes are described. A combination of swept frequency acoustic interferometry (SFAI), wide-bandwidth, air-coupled acoustic transducers, narrowband frequency data acquisition, and data conversion from the frequency domain to the time domain, if required, permits meaningful information to be extracted from such fluids.

Sinha, Dipen N. (Los Alamos, NM)

2012-05-15T23:59:59.000Z

282

Volatiles in hydrothermal fluids- A mass spectrometric study of fluid  

Open Energy Info (EERE)

Volatiles in hydrothermal fluids- A mass spectrometric study of fluid Volatiles in hydrothermal fluids- A mass spectrometric study of fluid inclusions from active geothermal systems Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Volatiles in hydrothermal fluids- A mass spectrometric study of fluid inclusions from active geothermal systems Details Activities (4) Areas (4) Regions (0) Abstract: A system for analysis of inclusion gas contents based upon quadrupole mass spectrometry has been designed, assembled and tested during the first 7 months of funding. The system is currently being tested and calibrated using inclusions with known gas contents from active geothermal systems. Analyses are in progress on inclusions from the Salton Sea, Valles Caldera, Geysers, and Coso geothermal systems. Author(s): Mckibben, M. A.

283

Fluid Streaming in Micro Bifurcating Networks Z. Zhang, A. Fadl, C. Liu, D. Meyer, M. Krafczyk*  

E-Print Network (OSTI)

Fluid Streaming in Micro Bifurcating Networks Z. Zhang, A. Fadl, C. Liu, D. Meyer, M. Krafczyk. In this paper, we propose a novel and simple micro streaming-based fluid propulsion technology that has the phenomena of flow streaming in a network of symmetrical bifurcations using computer simulations. Dimensional

Zhang, Zongqin

284

Semester project Lattice Boltzmann simulations of fluid flow: An unconventional approach to CFD  

E-Print Network (OSTI)

Semester project Lattice Boltzmann simulations of fluid flow: An unconventional approach to CFD Background: The lattice Boltzmann method is a new numerical method of computational fluid dynamics (CFD). Con on a continuous picture of matter. The lattice Boltzmann method instead relies on discrete particles having

Müller,Bernhard

285

Free Surface Lattice-Boltzmann fluid simulations with and without level sets  

E-Print Network (OSTI)

Free Surface Lattice-Boltzmann fluid simulations with and without level sets Nils Th¨urey, Ulrich R.Thuerey@cs.fau.de Abstract We present two variants of free surface Lattice- Boltzmann fluid simulations for the animation of liquids in computer graphics. The Lattice- Boltzmann method is an attractive alternative to conventional

286

Proceedings of FEDSM'03: ASME/JSME Joint Fluids Engineering Conference  

E-Print Network (OSTI)

Proceedings of FEDSM'03: 4th ASME/JSME Joint Fluids Engineering Conference Honolulu, Hawaii, USA Reni Raju and Subrata Roy Computational Plasma Dynamics Laboratory Department of Mechanical Engineering is no longer valid as the mean free path of the fluid becomes comparable to the dimension of the system

Roy, Subrata

287

Numerical simulation of fluid flow in porous/fractured media  

SciTech Connect

Theoretical models of fluid flow in porous/fractured media can help in the design of in situ fossil energy and mineral extraction technologies. Because of the complexity of these processes, numerical solutions are usually required. Sample calculations illustrate the capabilities of present day computer models.

Travis B.J.; Cook, T.L.

1981-01-01T23:59:59.000Z

288

The Tutorial for the Project of Mech 301 Fluid Mechanics  

E-Print Network (OSTI)

The Tutorial for the Project of Mech 301 Fluid Mechanics (Preprocessing, Solving, and Postprocessing) In this, project we will use OpenFOAM software to computationally examine the transonic flow past a 2D NACA airfoil. Since OpenFOAM is working only on Linux operation system, we have installed Ubuntu

Muradoglu, Metin

289

Notes 09. Fluid inertia and turbulence in fluid film bearings  

E-Print Network (OSTI)

When fluid inertia effects are important. Bulk-flow model for inertial flows. Turbulence and inertia in short length journal bearings and open end dampers....

San Andres, Luis

2009-01-01T23:59:59.000Z

290

Thermodynamic Model for Fluid-Fluid Interfacial Areas in Porous...  

NLE Websites -- All DOE Office Websites (Extended Search)

areas are important in controlling the rate of mass and energy transfer between fluid phases in porous media. We present a modified thermodynamically based model (TBM) to...

291

Computer model study: An analysis of the Nephew/Spore model for determining costs of cost of coal mining in Appalachia. Final report  

SciTech Connect

The study determined whether the model developed to study Costs of Coal Surface Mining and Reclamation in Appalachia was capable of being responsive to the needs of the Office of Surface Mining for projecting the extraction costs of coal in support of the Small Operator Assistance Program. The study analysis validated the model and adapted the model to specific small operator needs in terms of user flexibility. Based on the analysis and model enhancements approach used by the study, three primary recommendations are made: Validate the model with live cost and performance data to determine potential viability for small operator assistance; Enhance the model to provide greater flexibility and ease of user support; and field test the model through regional offices of the Small Operator Assistance Program.

Nephew, E.A.; Spore, R.L.

1980-06-06T23:59:59.000Z

292

Tomographical Imaging and Mathematical Description of Porous Media Used for the Prediction of Fluid Distribution  

Science Journals Connector (OSTI)

...Switzerland d Institut fur Computeranwendungen im Bauingenieurwesen, TU Braunschweig, Germany 5 GKSS-Research Centre, Geesthacht, Germany EXECUTIVE SUMMARY Images of pore structures were used to quantify the pore space and compute the fluid phase distribution...

P. Lehmann; P. Wyss; A. Flisch; E. Lehmann; P. Vontobel; M. Krafczyk; A. Kaestner; F. Beckmann; A. Gygi; H. Flhler

293

Device and method for measuring multi-phase fluid flow in a conduit having an abrupt gradual bend  

DOE Patents (OSTI)

A system is described for measuring fluid flow in a conduit having an abrupt bend. The system includes pressure transducers, one disposed in the conduit at the inside of the bend and one or more disposed in the conduit at the outside of the bend but spaced a distance therefrom. The pressure transducers measure the pressure of fluid in the conduit at the locations of the pressure transducers and this information is used by a computational device to calculate fluid flow rate in the conduit. For multi-phase fluid, the density of the fluid is measured by another pair of pressure transducers, one of which is located in the conduit elevationally above the other. The computation device then uses the density measurement along with the fluid pressure measurements, to calculate fluid flow. 1 fig.

Ortiz, M.G.

1998-02-10T23:59:59.000Z

294

A stochastic Monte Carlo computer simulation of the drop-weight test for the determination of nil-ductility transition temperature  

E-Print Network (OSTI)

on the surface of the specimen blank can produce heat affected zones that are tougher than the base metal, which could lead to artificially low predictions of NDIT [17[. In such m O zS O e O 0 LU 4 CR ki ?E O Z -I of 0 tiE I- O z 1 V gm 0) c e H N... aside, the manner in which test temperatures are chosen may contribute most to the variance and bias inherent in the drO-wweigh test method (ASTM E 208) for determining the nil-ductility transition temperature, NDTI; for ferritic steels...

Lambert, Michael Andrew

1990-01-01T23:59:59.000Z

295

Parallel performance of two applications in the Boeing high performance computing benchmark suite  

Science Journals Connector (OSTI)

We describe our work to evaluate the performance of the parallel versions of two floating-point-intensive engineering applications from Boeing's high performance computing benchmark suite (BHPCBS) on emerging RISC parallel systems and PC clusters. The first application is a computational fluid dynamics (CFD) code, OVERFLOW, developed by NASA and used by Boeing for analysis and design of advanced aircraft. The second application is a prototype of a computational electromagnetics (CEM) code, developed by Boeing and used for radar cross-section studies. The distributed memory parallel versions of both applications use the message passing interface (MPI) standard for message passing. The goal of our work was to determine whether RISC parallel systems and PC clusters, which offer high performance at low cost, may be able to meet Boeing's computing requirements in the future. We describe the test environments for the studies, discuss parallelization issues and strategies and present performance data for the two applications.

Joseph W. Manke; G. David Kerlick; David Levine; Subhankar Banerjee; Eric Dillon

2001-01-01T23:59:59.000Z

296

CX-008011: Categorical Exclusion Determination | Department of...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Determination CX-008011: Categorical Exclusion Determination Install EMSL Super-Computer Power Infrastructure CX(s) Applied: B1.7 Date: 06302011 Location(s): Washington...

297

Fracturing Fluid Characterization Facility  

NLE Websites -- All DOE Office Websites (Extended Search)

Documentation Page Documentation Page 1. Report No. DE - FC 21 - 92MC29077 2. 3. Recipient's Accession No. 5. Report Date August 31, 2000 4. Title and Subtitle Fracturing Fluid Characterization Facility 6. 7. Author(s) The University of Oklahoma 8. Performing Organization Rept. No. 10. Project/Task/Work Unit No. 9. Performing Organization Name and Address The University of Oklahoma Sarkeys Energy Center T301 100 E Boyd St Norman, OK 73019 11. Contract (C) or Grant (G) No. DOE:DE FC21 92 MC29077 13. Type of Report & Period Covered Final Report 09 30 92 - 03 31 00 12. Sponsoring Organization Name and Address US Dept of Energy - FETL 3610 Collins Ferry Road Morgantown, WV 26505 14. 15. Supplementary Notes Several technical papers were prepared and presented at various Society of Petroleum Engineers Conferences and US

298

A computer simulation study of the interaction between passivated and bare gold nanoclusters  

Science Journals Connector (OSTI)

...Consortium, funded by EPSRC (grants EP/D504872 and EP/F067496...and D. J. Tildesley1987 Computer simulation of liquidsOxford...subcritical-supercritical fluid: a computer simulation studyJ. Phys...in supercritical fluids: a computer simulation studyJ. Chem...

2011-01-01T23:59:59.000Z

299

Fluid Mechanics and Homeland Security  

E-Print Network (OSTI)

Fluid Mechanics and Homeland Security Gary S. Settles Mechanical and Nuclear Engineering Department and sampling, explosive detection, microfluidics and labs-on-a-chip, chem- ical plume dispersal in urban security combines established fluids topics like plume dispersion with others that are new

Settles, Gary S.

300

LECTURES IN ELEMENTARY FLUID DYNAMICS  

E-Print Network (OSTI)

LECTURES IN ELEMENTARY FLUID DYNAMICS: Physics, Mathematics and Applications J. M. McDonough Departments of Mechanical Engineering and Mathematics University of Kentucky, Lexington, KY 40506-0503 c 1987, 1990, 2002, 2004, 2009 #12;Contents 1 Introduction 1 1.1 Importance of Fluids

McDonough, James M.

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Interfacial deformation and jetting of a magnetic fluid  

E-Print Network (OSTI)

An attractive technique for forming and collecting aggregates of magnetic material at a liquid--air interface by an applied magnetic field gradient was recently addressed theoretically and experimentally [Soft Matter, (9) 2013, 8600-8608]: when the magnetic field is weak, the deflection of the liquid--air interface has a steady shape, while for sufficiently strong fields, the interface destabilizes and forms a jet that extracts magnetic material. Motivated by this work, we develop a numerical model for the closely related problem of solving two-phase Navier--Stokes equations coupled with the static Maxwell equations. We computationally model the forces generated by a magnetic field gradient produced by a permanent magnet and so determine the interfacial deflection of a magnetic fluid (a pure ferrofluid system) and the transition into a jet. We analyze the shape of the liquid--air interface during the deformation stage and the critical magnet distance for which the static interface transitions into a jet. We d...

Afkhami, Shahriar; Griffiths, Ian M

2015-01-01T23:59:59.000Z

302

Isotopic Analysis- Fluid At Sierra Valley Geothermal Area (1990) | Open  

Open Energy Info (EERE)

Isotopic Analysis- Fluid At Sierra Valley Geothermal Area (1990) Isotopic Analysis- Fluid At Sierra Valley Geothermal Area (1990) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Sierra Valley Geothermal Area (1990) Exploration Activity Details Location Sierra Valley Geothermal Area Exploration Technique Isotopic Analysis- Fluid Activity Date 1990 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine the recharge of the area Notes Hydrogen and oxygen isotope data on waters of Coso thermal and nonthermal waters were studied. Hydrogen and oxygen isotopes do not uniquely define the recharge area for the Coso geothermal system but strongly suggest Sierran recharge with perhaps some local recharge. References Whelan, J. A. (1 September 1990) Water geochemistry study of

303

Isotopic Analysis- Fluid At Coso Geothermal Area (1982) | Open Energy  

Open Energy Info (EERE)

Analysis- Fluid At Coso Geothermal Area (1982) Analysis- Fluid At Coso Geothermal Area (1982) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Coso Geothermal Area (1982) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Isotopic Analysis- Fluid Activity Date 1982 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine recharge for the system Notes Thirty-nine water samples were collected from the Coso geothermal system and vicinity and were analyzed for major chemical constituents and deltaD and delta18O. Non-thermal ground waters from the Coso Range were found to be isotopically heavier than non-thermal ground waters from the Sierra Nevada to the west. The deltaD value for the deep thermal water at Coso is

304

Isotopic Analysis- Fluid At Indian Valley Hot Springs Geothermal Area  

Open Energy Info (EERE)

Isotopic Analysis- Fluid At Indian Valley Hot Springs Geothermal Area Isotopic Analysis- Fluid At Indian Valley Hot Springs Geothermal Area (1990) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Indian Valley Hot Springs Geothermal Area (1990) Exploration Activity Details Location Indian Valley Hot Springs Geothermal Area Exploration Technique Isotopic Analysis- Fluid Activity Date 1990 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine the recharge of the area Notes Hydrogen and oxygen isotope data on waters of Coso thermal and nonthermal waters were studied. Hydrogen and oxygen isotopes do not uniquely define the recharge area for the Coso geothermal system but strongly suggest Sierran recharge with perhaps some local recharge. References

305

Isotopic Analysis- Fluid At Coso Geothermal Area (1990) | Open Energy  

Open Energy Info (EERE)

Analysis- Fluid At Coso Geothermal Area (1990) Analysis- Fluid At Coso Geothermal Area (1990) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Coso Geothermal Area (1990) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Isotopic Analysis- Fluid Activity Date 1990 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine the recharge of the area Notes Hydrogen and oxygen isotope data on waters of Coso thermal and nonthermal waters were studied. Hydrogen and oxygen isotopes do not uniquely define the recharge area for the Coso geothermal system but strongly suggest Sierran recharge with perhaps some local recharge. References Whelan, J. A. (1 September 1990) Water geochemistry study of Indian Wells Valley, Inyo and Kern Counties, California. Supplement.

306

Isotopic Analysis- Fluid At Rose Valley Geothermal Area (1990) | Open  

Open Energy Info (EERE)

Isotopic Analysis- Fluid At Rose Valley Geothermal Area (1990) Isotopic Analysis- Fluid At Rose Valley Geothermal Area (1990) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Rose Valley Geothermal Area (1990) Exploration Activity Details Location Rose Valley Geothermal Area Exploration Technique Isotopic Analysis- Fluid Activity Date 1990 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine the recharge of the area Notes Hydrogen and oxygen isotope data on waters of Coso thermal and nonthermal waters were studied. Hydrogen and oxygen isotopes do not uniquely define the recharge area for the Coso geothermal system but strongly suggest Sierran recharge with perhaps some local recharge. References Whelan, J. A. (1 September 1990) Water geochemistry study of

307

Effective perfect fluids in cosmology  

SciTech Connect

We describe the cosmological dynamics of perfect fluids within the framework of effective field theories. The effective action is a derivative expansion whose terms are selected by the symmetry requirements on the relevant long-distance degrees of freedom, which are identified with comoving coordinates. The perfect fluid is defined by requiring invariance of the action under internal volume-preserving diffeomorphisms and general covariance. At lowest order in derivatives, the dynamics is encoded in a single function of the entropy density that characterizes the properties of the fluid, such as the equation of state and the speed of sound. This framework allows a neat simultaneous description of fluid and metric perturbations. Longitudinal fluid perturbations are closely related to the adiabatic modes, while the transverse modes mix with vector metric perturbations as a consequence of vorticity conservation. This formalism features a large flexibility which can be of practical use for higher order perturbation theory and cosmological parameter estimation.

Ballesteros, Guillermo [Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Piazza del Viminale 1, I-00184 Rome (Italy); Bellazzini, Brando, E-mail: guillermo.ballesteros@unige.ch, E-mail: brando.bellazzini@pd.infn.it [Dipartimento di Fisica, Universit di Padova and INFN, Sezione di Padova, Via Marzolo 8, I-35131 Padova (Italy)

2013-04-01T23:59:59.000Z

308

Thermal Hydraulic Optimization of Nuclear Systems [Heat Transfer and Fluid  

NLE Websites -- All DOE Office Websites (Extended Search)

Thermal Hydraulic Thermal Hydraulic Optimization of Nuclear Systems Capabilities Engineering Computation and Design Engineering and Structural Mechanics Systems/Component Design, Engineering and Drafting Heat Transfer and Fluid Mechanics Overview Thermal Hydraulic Optimization of Nuclear Systems Underhood Thermal Management Combustion Simulations Advanced Model and Methodology Development Multi-physics Reactor Performance and Safety Simulations Other Capabilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Heat Transfer and Fluid Mechanics Bookmark and Share Thermal Hydraulic Optimization of Nuclear Systems Accelerator Driven Test Facility Target Accelerator Driven Test Facility Target. Click on image to view larger

309

Underhood Thermal Management [Heat Transfer and Fluid Mechanics] - Nuclear  

NLE Websites -- All DOE Office Websites (Extended Search)

Underhood Thermal Underhood Thermal Management Capabilities Engineering Computation and Design Engineering and Structural Mechanics Systems/Component Design, Engineering and Drafting Heat Transfer and Fluid Mechanics Overview Thermal Hydraulic Optimization of Nuclear Systems Underhood Thermal Management Combustion Simulations Advanced Model and Methodology Development Multi-physics Reactor Performance and Safety Simulations Other Capabilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Heat Transfer and Fluid Mechanics Bookmark and Share Underhood Thermal Management Hybrid Vehicle Underhood Thermal Analysis Hybrid Vehicle Underhood Thermal Analysis. Click on image to view larger image. In addition to nuclear system applications, the section applies its

310

Advanced Model and Methodology Development [Heat Transfer and Fluid  

NLE Websites -- All DOE Office Websites (Extended Search)

Advanced Model and Advanced Model and Methodology Development Capabilities Engineering Computation and Design Engineering and Structural Mechanics Systems/Component Design, Engineering and Drafting Heat Transfer and Fluid Mechanics Overview Thermal Hydraulic Optimization of Nuclear Systems Underhood Thermal Management Combustion Simulations Advanced Model and Methodology Development Multi-physics Reactor Performance and Safety Simulations Other Capabilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Heat Transfer and Fluid Mechanics Bookmark and Share Advanced Model and Methodology Development Electrorefiner Model for Treatment of Spent Nuclear Fuel Electrorefiner Model for Treatment of Spent Nuclear Fuel. Click on image to

311

Simulation of structure formation in an electrorheological fluid  

Science Journals Connector (OSTI)

The temporal evolution of three-dimensional structure in an electrorheological (ER) fluid is examined by a computer simulation. A parameter B characterizing the ratio of the Brownian force to the dipolar force is introduced. For a wide range of B, the ER fluid has a rapid chain formation followed by aggregation of chains into thick columns which has a body-centered tetragonal lattice structure. The Peierls-Landau instability of single chains help formation of thick columns. If the Brownian force is very small, the ER system may be trapped in some local energy-minimum state.

R. Tao and Qi Jiang

1994-07-04T23:59:59.000Z

312

Fluid equations in the presence of electron cyclotron current drive  

SciTech Connect

Two-fluid equations, which include the physics imparted by an externally applied radiofrequency source near electron cyclotron resonance, are derived in their extended magnetohydrodynamic forms using the formalism of Hegna and Callen [Phys. Plasmas 16, 112501 (2009)]. The equations are compatible with the closed fluid/drift-kinetic model developed by Ramos [Phys. Plasmas 17, 082502 (2010); 18, 102506 (2011)] for fusion-relevant regimes with low collisionality and slow dynamics, and they facilitate the development of advanced computational models for electron cyclotron current drive-induced suppression of neoclassical tearing modes.

Jenkins, Thomas G.; Kruger, Scott E. [Tech-X Corporation, 5621 Arapahoe Avenue, Boulder, Colorado 80303 (United States)

2012-12-15T23:59:59.000Z

313

Quartz resonator fluid density and viscosity monitor  

DOE Patents (OSTI)

A pair of thickness-shear mode resonators, one smooth and one with a textured surface, allows fluid density and viscosity to be independently resolved. A textured surface, either randomly rough or regularly patterned, leads to trapping of liquid at the device surface. The synchronous motion of this trapped liquid with the oscillating device surface allows the device to weigh the liquid; this leads to an additional response that depends on liquid density. This additional response enables a pair of devices, one smooth and one textured, to independently resolve liquid density and viscosity; the difference in responses determines the density while the smooth device determines the density-viscosity product, and thus, the pair determines both density and viscosity.

Martin, Stephen J. (Albuquerque, NM); Wiczer, James J. (Albuquerque, NM); Cernosek, Richard W. (Albuquerque, NM); Frye, Gregory C. (Cedar Crest, NM); Gebert, Charles T. (Albuquerque, NM); Casaus, Leonard (Bernalillo, NM); Mitchell, Mary A. (Tijeras, NM)

1998-01-01T23:59:59.000Z

314

Computer Science  

NLE Websites -- All DOE Office Websites (Extended Search)

Computer Science Computer Science1354608000000Computer ScienceSome of these resources are LANL-only and will require Remote Access.NoQuestions? 667-5809library@lanl.gov Computer...

315

Computer Science Computer Science?  

E-Print Network (OSTI)

. Data and Information: Meet the challenges of"big data"via information management and through database in electrical engineering and computer science MSAIL: Artificial intelligence group HKN: Eta Kappa Nu honor

Eustice, Ryan

316

oil-emulsion (rotary) drilling fluid  

Science Journals Connector (OSTI)

oil-emulsion (rotary) drilling fluid, oil-emulsion fluid [Used where low fluid-loss, very thin cake, and good lubrication of the drill pipe are of primary importance, such as in directional drilling ...

2014-08-01T23:59:59.000Z

317

oil-base(d) (rotary) drilling fluid  

Science Journals Connector (OSTI)

oil-base(d) (rotary) drilling fluid, oil-base(d) fluid [Used primarily for drilling-in or recomputing wells in formations subject ... with low formation pressures. See remark under drilling fluid] ...

2014-08-01T23:59:59.000Z

318

Lattice Boltzmann simulations of complex fluids  

Science Journals Connector (OSTI)

......research-article Articles Lattice Boltzmann simulations of complex fluids...OX1 3NP, UK We discuss how lattice Boltzmann simulations can be used to model...binary and lamellar fluids. lattice Boltzmann|complex fluids|shear flow......

J. M. YEOMANS; ALEXANDER J. WAGNER

2000-10-01T23:59:59.000Z

319

Finite element simulation of electrorheological fluids  

E-Print Network (OSTI)

Electrorheological (ER) fluids change their flow properties dramatically when an electric field is applied. These fluids are usually composed of dispersions of polarizable particles in an insulating base fluid or composed ...

Rhyou, Chanryeol, 1973-

2005-01-01T23:59:59.000Z

320

Apparatus and method for rapid separation and detection of hydrocarbon fractions in a fluid stream  

DOE Patents (OSTI)

An apparatus and method for rapid fractionation of hydrocarbon phases in a sample fluid stream are disclosed. Examples of the disclosed apparatus and method include an assembly of elements in fluid communication with one another including one or more valves and at least one sorbent chamber for removing certain classifications of hydrocarbons and detecting the remaining fractions using a detector. The respective ratios of hydrocarbons are determined by comparison with a non separated fluid stream.

Sluder, Charles S.; Storey, John M.; Lewis, Sr., Samuel A.

2013-01-22T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Microscale behavior in amphiphilic fluid mixtures predicted by the SAFT equation  

SciTech Connect

The thermodynamic behavior of amphiphilic fluids is investigated by applying the sphere-and-bond formalism to the statistical associating fluid theory (SAFT); general equations are presented for obtaining microscale information from the SAFT equation. Both bulk phase and microphase equilibria for a model of a chain amphiphile dissolved in a simple solvent are determined, and fluid microphase compositions also are calculated. 22 refs., 8 figs.

Kuespert, D.R.; Donohue, M.D. [Johns Hopkins Univ., Baltimore, MD (United States)

1995-03-30T23:59:59.000Z

322

Lattice Boltzmann model for compressible fluids  

Science Journals Connector (OSTI)

We formulate a lattice Boltzmann model which simulates compressible fluids. By choosing the parameters of the equilibrium distribution appropriately, we are able to select the sound speed (which may be set arbitrarily low), bulk viscosity, and kinematic viscosity. This model simulates compressible flows and can include shocks. With a proper rescaling and zero-sound speed, this model simulates Burgerss equation. The viscosity determined by a Chapman-Enskog expansion compares well with that measured from simulations. We also compare the exact solutions of Burgerss equation on the unit circle to solutions of our lattice Boltzmann model, again finding reasonable agreement.

F. J. Alexander; H. Chen; S. Chen; G. D. Doolen

1992-08-15T23:59:59.000Z

323

Fluid flow monitoring device  

DOE Patents (OSTI)

A flow meter and temperature measuring device are described comprising a tube with a body centered therein for restricting flow and a sleeve at the upper end of the tube to carry several channels formed longitudinally in the sleeve to the appropriate axial location where they penetrate the tube to allow pressure measurements and temperature measurements with thermocouples. The high pressure measurement is made using a channel penetrating the tube away from the body and the low pressure measurement is made at a location at the widest part of the body. An end plug seals the end of the device and holes at its upper end allow fluid to pass from the interior of the tube into a plenum. The channels are made by cutting grooves in the sleeve, the grooves widened at the surface of the sleeve and then a strip of sleeve material is welded to the grooves closing the channels. Preferably the sleeve is packed with powdered graphite before cutting the grooves and welding the strips. 7 figures.

McKay, M.D.; Sweeney, C.E.; Spangler, B.S. Jr.

1993-11-30T23:59:59.000Z

324

Fluid flow monitoring device  

DOE Patents (OSTI)

A flow meter and temperature measuring device comprising a tube with a body centered therein for restricting flow and a sleeve at the upper end of the tube to carry several channels formed longitudinally in the sleeve to the appropriate axial location where they penetrate the tube to allow pressure measurements and temperature measurements with thermocouples. The high pressure measurement is made using a channel penetrating the tube away from the body and the low pressure measurement is made at a location at the widest part of the body. An end plug seals the end of the device and holes at its upper end allow fluid to pass from the interior of the tube into a plenum. The channels are made by cutting grooves in the sleeve, the grooves widened at the surface of the sleeve and then a strip of sleeve material is welded to the grooves closing the channels. Preferably the sleeve is packed with powdered graphite before cutting the grooves and welding the strips.

McKay, Mark D. (1426 Socastee Dr., North Augusta, SC 29841); Sweeney, Chad E. (3600 Westhampton Dr., Martinez, GA 30907-3036); Spangler, Jr., B. Samuel (2715 Margate Dr., Augusta, GA 30909)

1993-01-01T23:59:59.000Z

325

Fluid sampling system  

DOE Patents (OSTI)

An fluid sampling system allows sampling of radioactive liquid without spillage. A feed tank is connected to a liquid transfer jet powered by a pumping chamber pressurized by compressed air. The liquid is pumped upwardly into a sampling jet of a venturi design having a lumen with an inlet, an outlet, a constricted middle portion, and a port located above the constricted middle portion. The liquid is passed under pressure through the constricted portion causing its velocity to increase and its pressure to be decreased, thereby preventing liquid from escaping. A septum sealing the port can be pierced by a two pointed hollow needle leading into a sample bottle also sealed by a pierceable septum affixed to one end. The bottle is evacuated by flow through the sample jet, cyclic variation in the sampler jet pressure periodically leaves the evacuated bottle with lower pressure than that of the port, thus causing solution to pass into the bottle. The remaining solution in the system is returned to the feed tank via a holding tank. 4 figs.

Houck, E.D.

1994-10-11T23:59:59.000Z

326

Tracing Geothermal Fluids  

SciTech Connect

Geothermal water must be injected back into the reservoir after it has been used for power production. Injection is critical in maximizing the power production and lifetime of the reservoir. To use injectate effectively the direction and velocity of the injected water must be known or inferred. This information can be obtained by using chemical tracers to track the subsurface flow paths of the injected fluid. Tracers are chemical compounds that are added to the water as it is injected back into the reservoir. The hot production water is monitored for the presence of this tracer using the most sensitive analytic methods that are economically feasible. The amount and concentration pattern of the tracer revealed by this monitoring can be used to evaluate how effective the injection strategy is. However, the tracers must have properties that suite the environment that they will be used in. This requires careful consideration and testing of the tracer properties. In previous and parallel investigations we have developed tracers that are suitable from tracing liquid water. In this investigation, we developed tracers that can be used for steam and mixed water/steam environments. This work will improve the efficiency of injection management in geothermal fields, lowering the cost of energy production and increasing the power output of these systems.

Michael C. Adams; Greg Nash

2004-03-01T23:59:59.000Z

327

Determination of petroleum pipe scale solubility in simulated lung fluid  

E-Print Network (OSTI)

referred to as ??scale.?? This thesis is concerned with the presence of 226Ra in scale deposited on the inner surfaces of oil drilling pipes and the internal dose consequences of inhalation of that scale once released. In the process of normal operation...

Cezeaux, Jason Roderick

2005-08-29T23:59:59.000Z

328

Detachment Energies of Spheroidal Particles from Fluid-Fluid Interfaces  

E-Print Network (OSTI)

The energy required to detach a single particle from a fluid-fluid interface is an important parameter for designing certain soft materials, for example, emulsions stabilised by colloidal particles, colloidosomes designed for targeted drug delivery, and bio-sensors composed of magnetic particles adsorbed at interfaces. For a fixed particle volume, prolate and oblate spheroids attach more strongly to interfaces because they have larger particle-interface areas. Calculating the detachment energy of spheroids necessitates the difficult measurement of particle-liquid surface tensions, in contrast with spheres, where the contact angle suffices. We develop a simplified detachment energy model for spheroids which depends only on the particle aspect ratio and the height of the particle centre of mass above the fluid-fluid interface. We use lattice Boltzmann simulations to validate the model and provide quantitative evidence that the approach can be applied to simulate particle-stabilized emulsions, and highlight the experimental implications of this validation.

Gary B. Davies; Timm Krger; Peter V. Coveney; Jens Harting

2014-07-01T23:59:59.000Z

329

: Computer Aided Learning in Computer  

E-Print Network (OSTI)

CAL2 : Computer Aided Learning in Computer Architecture Laboratory JOVAN DJORDJEVIC,1 BOSKO NIKOLIC,1 TANJA BOROZAN,1 ALEKSANDAR MILENKOVIC´ 2 1 Computer Engineering Department, Faculty of Electrical Engineering, University of Belgrade, Belgrade, Serbia 2 Electrical and Computer Engineering Department

Milenkovi, Aleksandar

330

Downhole Fluid Sampling | Open Energy Information  

Open Energy Info (EERE)

Downhole Fluid Sampling Downhole Fluid Sampling Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Downhole Fluid Sampling Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Testing Techniques Parent Exploration Technique: Well Testing Techniques Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Water composition and source of fluids. Gas composition and source of fluids. Thermal: Water temperature. Distinguish magmatic/mantle heat inputs. Can be used to estimate reservoir fluid temperatures. Dictionary.png Downhole Fluid Sampling: Downhole fluid sampling is done to characterize the chemical, thermal, or hydrological properties of a surface or subsurface aqueous system. Downhole

331

Isotopic Analysis- Fluid | Open Energy Information  

Open Energy Info (EERE)

Isotopic Analysis- Fluid Isotopic Analysis- Fluid Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Isotopic Analysis- Fluid Details Activities (61) Areas (32) Regions (6) NEPA(0) Exploration Technique Information Exploration Group: Lab Analysis Techniques Exploration Sub Group: Fluid Lab Analysis Parent Exploration Technique: Fluid Lab Analysis Information Provided by Technique Lithology: Water rock interaction Stratigraphic/Structural: Hydrological: Origin of hydrothermal fluids; Mixing of hydrothermal fluids Thermal: Isotopic ratios can be used to characterize and locate subsurface thermal anomalies. Dictionary.png Isotopic Analysis- Fluid: Isotopes are atoms of the same element that have different numbers of neutrons. An isotopic analysis looks at a particular isotopic element(s) in

332

Gel Evolution in Oil Based Drilling Fluids.  

E-Print Network (OSTI)

?? Drilling fluids make up an essential part of the drilling operation. Successful drilling operations rely on adequate drilling fluid quality. With the development of (more)

Sandvold, Ida

2012-01-01T23:59:59.000Z

333

Shale Gas Development Challenges: Fracture Fluids | Department...  

Office of Environmental Management (EM)

Fluids Shale Gas Development Challenges: Fracture Fluids More Documents & Publications Natural Gas from Shale: Questions and Answers Shale Gas Glossary FracFocus 2.0 Task Force...

334

Chemically Reactive Working Fluids | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Chemically Reactive Working Fluids for the Capture and Transport of Concentrated Solar Thermal Energy for Power Generation Chemically Reactive Working Fluids SunShot CSP...

335

Acoustic Concentration Of Particles In Fluid Flow  

NLE Websites -- All DOE Office Websites (Extended Search)

in a fluid flow includes a substantially acoustically transparent membrane and a vibration generator that define a fluid flow path therebetween. Available for thumbnail of...

336

Fluid Gravity Engineering Rocket motor flow analysis  

E-Print Network (OSTI)

Fluid Gravity Engineering Capability · Rocket motor flow analysis -Internal (performance) -External young scientists/engineers Fluid Gravity Engineering Ltd #12;

Anand, Mahesh

337

The influence of fluid properties on the success of hydraulic fracturing operations  

SciTech Connect

Hydroxypropylguar based fluids are the most commonly used fluids for hydraulic fracturing. Through the addition of borate ions the polymer present in the fluid can crosslink to form a high viscosity gel. Prior to placement in the fracture the fluid is required to have a low viscosity to minimize friction losses in the tubular goods. A high viscosity fluid is required in the fracture for several reasons, primarily to suspend the proppant and to minimize fluid loss into the formation. This paper describes a new method which can be used to model the gelation reaction of crosslinking fluids. By modeling the dynamic properties of the fluid it is possible to predict the physical state of the fluid at any time during a fracturing treatment. Small amplitude oscillatory measurements are applied to fluid samples in a cone-and-plate geometry. The change in the dynamic properties with time can be fitted to a simple model which can then be used to determine the gel time for the fluid. Methods used to distinguish between the liquid and gel state are also discussed.

Power, D.J.; Boger, D.V. [Univ. of Melbourne, Victoria (Australia); Paterson, L.

1994-12-31T23:59:59.000Z

338

Fluid Inclusion Analysis At Coso Geothermal Area (2003) | Open Energy  

Open Energy Info (EERE)

Coso Geothermal Area Coso Geothermal Area (2003) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Fluid Inclusion Analysis Activity Date 2003 Usefulness not indicated DOE-funding Unknown Exploration Basis 1) Fracture/stress analysis. 2)To determine the driver of the relationship between hydrogen and organic species. Notes 1) Fluid inclusion analyses of cuttings from well 83-16 were used to determine the temperatures of vein mineralization. 2) Measurement of organic compounds in fluid inclusions shows that there are strong relationships between H2 concentrations and alkane/alkene ratios and benzene concentrations. Inclusion analyses that indicate H2 concentrations > 0.001 mol % typically have ethane > ethylene, propane > propylene, and

339

Fluid Flow Model Development for Representative Geologic Media | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Fluid Flow Model Development for Representative Geologic Media Fluid Flow Model Development for Representative Geologic Media Fluid Flow Model Development for Representative Geologic Media Clay and granitic geologic rock units are potential host media for future repositories for used nuclear fuel and high level waste. This report addresses the representation of flow in these two media within numerical process models. Discrete fracture network (DFNs) models are an approach to representing flow in fractured granite that explicitly represents the geometry and flow properties of individual fractures. New DFN generation and computational grid generation methods have been developed and tested. Mesh generation and the generation of flow streamlines within the DFN are also included. Traditional form of Darcy's law is not adequate

340

Computing and Visualization in Science manuscript No. DOI: 10.1007/s00791-008-0090-4  

E-Print Network (OSTI)

of bubble formation regimes [4] or for applications in civil engineering such as certain types of fluid. problematic to ensure stability and reasonable computation times for complex flows. Our fluid simulation uses

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Fluid Imaging | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit History Facebook icon Twitter icon » Fluid Imaging Jump to: navigation, search Contents 1 Geothermal Lab Call Projects for Fluid Imaging 2 Geothermal ARRA Funded Projects for Fluid Imaging Geothermal Lab Call Projects for Fluid Imaging Loading map... {"format":"googlemaps3","type":"ROADMAP","types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"limit":200,"offset":0,"link":"all","sort":[""],"order":[],"headers":"show","mainlabel":"","intro":"","outro":"","searchlabel":"\u2026 further results","default":"","geoservice":"google","zoom":14,"width":"600px","height":"350px","centre":false,"layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","icon":"","visitedicon":"","forceshow":true,"showtitle":true,"hidenamespace":false,"template":false,"title":"","label":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"locations":[{"text":"

342

Bio-inspired fluid locomotion  

E-Print Network (OSTI)

We have developed several novel methods of locomotion at low Reynolds number, for both Newtonian and non-Newtonian fluids: Robosnails 1 and 2, which operate on a lubrication layer, and the three-link swimmer which moves ...

Chan, Brian, 1980-

2009-01-01T23:59:59.000Z

343

Self-similar perfect fluids  

E-Print Network (OSTI)

Space-times admitting an $r$-parameter Lie group of homotheties are studied for $r > 2$ devoting a special attention to those representing perfect fluid solutions to Einstein's field equations.

J. Carot; A. M. Sintes

2000-05-16T23:59:59.000Z

344

Biocatalytic transformations of hydrothermal fluids  

Science Journals Connector (OSTI)

...emission into oxygenated ambient seawater. The large metabolic and physiological...emission into oxygenated ambient seawater. The large metabolic and physiological...DNA (the reproducing genetic storage for each species), individual...where entrained oxygenated seawater mixes with hydrothermal fluid...

1997-01-01T23:59:59.000Z

345

Atomistic methods in fluid simulation  

Science Journals Connector (OSTI)

...easily describable by traditional methods, as ICF involves a complex coupling between fluid instabilities and combustion processes at very small length and times scales. One contribution of 13 to a Theme Issue Turbulent mixing and beyond . Figure...

2010-01-01T23:59:59.000Z

346

On the Dynamics of Magnetic Fluids in Magnetic Resonance Padraig J. Cantillon-Murphy  

E-Print Network (OSTI)

On the Dynamics of Magnetic Fluids in Magnetic Resonance Imaging by Padraig J. Cantillon-Murphy Submitted to the Department of Electrical Engineering and Computer Science in partial fulfillment of Electric'algngineering and Computer Science May 22nd, 2008. Certified

347

University of East Anglia technology offering Fluid mechanics  

E-Print Network (OSTI)

· Financial indemnity e.g.· marine insurance Renewable energy, oil and· gas e.g. determining mass flow rate and free surface flows:· effects of surface tension on fluid flows; flow past obstacles; spiralling liquid toppled structure in Shetlands Colossal waves collapsed a stainless steel support structure for a solar

Matthews, Adrian

348

Computer analyses for the design, operation and safety of new isotope production reactors: A technology status review  

SciTech Connect

A review is presented on the currently available technologies for nuclear reactor analyses by computer. The important distinction is made between traditional computer calculation and advanced computer simulation. Simulation needs are defined to support the design, operation, maintenance and safety of isotope production reactors. Existing methods of computer analyses are categorized in accordance with the type of computer involved in their execution: micro, mini, mainframe and supercomputers. Both general and special-purpose computers are discussed. Major computer codes are described, with regard for their use in analyzing isotope production reactors. It has been determined in this review that conventional systems codes (TRAC, RELAP5, RETRAN, etc.) cannot meet four essential conditions for viable reactor simulation: simulation fidelity, on-line interactive operation with convenient graphics, high simulation speed, and at low cost. These conditions can be met by special-purpose computers (such as the AD100 of ADI), which are specifically designed for high-speed simulation of complex systems. The greatest shortcoming of existing systems codes (TRAC, RELAP5) is their mismatch between very high computational efforts and low simulation fidelity. The drift flux formulation (HIPA) is the viable alternative to the complicated two-fluid model. No existing computer code has the capability of accommodating all important processes in the core geometry of isotope production reactors. Experiments are needed (heat transfer measurements) to provide necessary correlations. It is important for the nuclear community, both in government, industry and universities, to begin to take advantage of modern simulation technologies and equipment. 41 refs.

Wulff, W.

1990-01-01T23:59:59.000Z

349

Numerical implication of Riemann problem theory for fluid dynamics  

SciTech Connect

The Riemann problem plays an important role in understanding the wave structure of fluid flow. It is also crucial step in some numerical algorithms for accurately and efficiently computing fluid flow; Godunov method, random choice method, and from tracking method. The standard wave structure consists of shock and rarefaction waves. Due to physical effects such as phase transitions, which often are indistinguishable from numerical errors in an equation of state, anomalkous waves may occur, ''rarefaction shocks'', split waves, and composites. The anomalous waves may appear in numerical calculations as waves smeared out by either too much artificial viscosity or insufficient resolution. In addition, the equation of state may lead to instabilities of fluid flow. Since these anomalous effects due to the equation of state occur for the continuum equations, they can be expected to occur for all computational algorithms. The equation of state may be characterized by three dimensionless variables: the adiabatic exponent ..gamma.., the Grueneisen coefficient GAMMA, and the fundamental derivative G. The fluid flow anomalies occur when inequalities relating these variables are violated. 18 refs.

Menikoff, R.

1988-01-01T23:59:59.000Z

350

A preliminary study to Assess Model Uncertainties in Fluid Flows  

SciTech Connect

The goal of this study is to assess the impact of various flow models for a simplified primary coolant loop of a light water nuclear reactor. The various fluid flow models are based on the Euler equations with an additional friction term, gravity term, momentum source, and energy source. The geometric model is purposefully chosen simple and consists of a one-dimensional (1D) loop system in order to focus the study on the validity of various fluid flow approximations. The 1D loop system is represented by a rectangle; the fluid is heated up along one of the vertical legs and cooled down along the opposite leg. A pressurizer and a pump are included in the horizontal legs. The amount of energy transferred and removed from the system is equal in absolute value along the two vertical legs. The various fluid flow approximations are compressible vs. incompressible, and complete momentum equation vs. Darcys approximation. The ultimate goal is to compute the fluid flow models uncertainties and, if possible, to generate validity ranges for these models when applied to reactor analysis. We also limit this study to single phase flows with low-Mach numbers. As a result, sound waves carry a very small amount of energy in this particular case. A standard finite volume method is used for the spatial discretization of the system.

Marc Oliver Delchini; Jean C. Ragusa

2009-09-01T23:59:59.000Z

351

Rheological fluid motion in tube by metachronal wave of cilia  

E-Print Network (OSTI)

The purpose of this paper is a theoretical study of a non-linear problem of rheological fluid transport in an axisymmetric tube by cilium. However, an attempt has been made to explain the role of cilia motion on the transport of fluid through the ductus efferentes of the male reproductive tract. Ostwald-de Waele power law viscous fluid has been considered to represent the rheological fluid to analyze pumping by means of a sequence of beat of cilia from row to row of cilia in a given row of cells and from one row of cells to the next (metachronal wave movement) under conditions for which the corresponding Reynolds number is small enough for inertial effects to be negligible and the wavelength to diameter ratio is large enough for the pressure to be considered uniform over the cross-section. Analyses and computations of the detailed fluid motions reveal that the time-averaged flow rates are directly dependent on epsilon, a non-dimensional measure involving the mean radius R of the tube and the cilia length. Thu...

Maiti, S

2013-01-01T23:59:59.000Z

352

Acoustic sand detector for fluid flowstreams  

DOE Patents (OSTI)

The particle volume and particle mass production rate of particulate solids entrained in fluid flowstreams such as formation sand or fracture proppant entrained in oil and gas production flowstreams is determined by a system having a metal probe interposed in a flow conduit for transmitting acoustic emissions created by particles impacting the probe to a sensor and signal processing circuit which produces discrete signals related to the impact of each of the particles striking the probe. The volume or mass flow rate of particulates is determined from making an initial particle size distribution and particle energy distribution and comparing the initial energy distribution and/or the initial size distribution with values related to the impact energies of a predetermined number of recorded impacts. The comparison is also used to recalibrate the system to compensate for changes in flow velocity.

Beattie, Alan G. (Corrales, NM); Bohon, W. Mark (Frisco, TX)

1993-01-01T23:59:59.000Z

353

Experimental characterisation of nonlocal photon fluids  

E-Print Network (OSTI)

Quantum gases of atoms and exciton-polaritons are nowadays a well established theoretical and experimental tool for fundamental studies of quantum many-body physics and suggest promising applications to quantum computing. Given their technological complexity, it is of paramount interest to devise other systems where such quantum many-body physics can be investigated at a lesser technological expense. Here we examine a relatively well-known system of laser light propagating through thermo-optical defocusing media: based on a hydrodynamical description of light as a quantum fluid of interacting photons, we propose such systems as a valid, room temperature alternative to atomic or exciton-polariton condensates for studies of many-body physics. First, we show that by using a technique traditionally used in oceanography, it is possible to perform a direct measurement of the single-particle part of the dispersion relation of the elementary excitations on top of the photon fluid and to detect its global flow. Then, ...

Vocke, David; Marino, Francesco; Wright, Ewan M; Carusotto, Iacopo; Faccio, Daniele

2015-01-01T23:59:59.000Z

354

Combustion Simulations [Heat Transfer and Fluid Mechanics] - Nuclear  

NLE Websites -- All DOE Office Websites (Extended Search)

Combustion Simulations Combustion Simulations Capabilities Engineering Computation and Design Engineering and Structural Mechanics Systems/Component Design, Engineering and Drafting Heat Transfer and Fluid Mechanics Overview Thermal Hydraulic Optimization of Nuclear Systems Underhood Thermal Management Combustion Simulations Advanced Model and Methodology Development Multi-physics Reactor Performance and Safety Simulations Other Capabilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Heat Transfer and Fluid Mechanics Bookmark and Share Combustion Simulations Density Distribution of Spray in Near-Injector Region Density Distribution of Spray in Near-Injector Region. Click on image to view larger image. Development of computer models based on Front-Tracking and

355

Transparent fluids for 157-nm immersion lithography  

E-Print Network (OSTI)

- gineers. [DOI: 10.1117/1.1637366] Subject terms: 157-nm lithography; immersion fluid; perfluoropolyether

Rollins, Andrew M.

356

Fluid Mechanics IB Lecturer: Dr Natalia Berloff  

E-Print Network (OSTI)

-efficient aircraft design, hydroelectric power, chemical processing, jet-driven cutting tools · our fluid environment

357

Computational Procedures for Determining Parameters in Ramberg...  

Office of Scientific and Technical Information (OSTI)

Ueng Jian-Chu Chen July, 1992 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States...

358

IEEE Computer Society: http://computer.org Computer: http://computer.org/computer  

E-Print Network (OSTI)

IEEE Computer Society: http://computer.org Computer: http://computer.org/computer computer@computer.org IEEE Computer Society Publications Office: +1 714 821 8380 COVER FEATURES GUEST EDITOR'S INTRODUCTION 28 Computational Photography--The Next Big Step Oliver Bimber Computational photography extends

Stanford University

359

First-principles modeling of fluid and solute exchange in the human during normal and hemodialysis conditions  

Science Journals Connector (OSTI)

A first-principles computer model of fluid and solute exchange under both physiological and hemodialysis condition is presented. The whole system has been modeled and simulated under the MODELICA integrated environment, which uses a hierarchical modeling ... Keywords: First-principles modeling, Fluid and solute balance, Hemodialysis, Hierarchical modeling, MODELICA simulation language

J. Fernandez de Canete; P. Del Saz Huang

2010-09-01T23:59:59.000Z

360

Computational Analysis of Fluid Flow in Pebble Bed Modular Reactor  

E-Print Network (OSTI)

High Temperature Gas-cooled Reactor (HTGR) is a Generation IV reactor under consideration by Department of Energy and in the nuclear industry. There are two categories of HTGRs, namely, Pebble Bed Modular Reactor (PBMR) and Prismatic reactor. Pebble...

Gandhir, Akshay

2012-10-19T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

ESS liquid-metal target design using computational fluid dynamics  

SciTech Connect

The thermal-hydraulic performance of a spallation neutron source target limits the highest neutron fluxes that can be generated. The current design for the European spallation source consists of a liquid metal encased within a containing shell, wedge-shaped in the direction of the incoming proton beam, with rounded sides in a cross section through a plane normal to the beam.

Dury, T.V. [Paul Scherrer Institute, Villigen (Switzerland)

1997-12-01T23:59:59.000Z

362

Application of computational fluid dynamics to aerosol sampling and concentration  

E-Print Network (OSTI)

, FLUENT 6 is used to analyze the performance of aerosol sampling and concentration devices including inlet components (impactors), cyclones, and virtual impactors. The ? ? k model was used to predict particle behavior in Inline Cone Impactor (ICI) and Jet...

Hu, Shishan

2009-05-15T23:59:59.000Z

363

Seventh International Conference on Computational Fluid Dynamics (ICCFD7),  

E-Print Network (OSTI)

, and combusting flows encountered in propulsion systems (e.g., gas turbine engines and solid propellant rocket

Groth, Clinton P. T.

364

Computational fluid dynamics for turbomachinery internal air systems  

Science Journals Connector (OSTI)

...predicted component temperature distribution may have to be...positive radial temperature gradient results...experimental correlation. Sun et al. (2004...number (Bo) (Sun et al. 2006...8 Instantaneous temperature contours on the...

2007-01-01T23:59:59.000Z

365

Welcome to the Computational Fluid Dynamics Matt de Stadler  

E-Print Network (OSTI)

ridges and continental slopes but their characteristics and relation with respect to the oscillating tide are not understood Energy contour plot #12;Oscillating Flow over a Sloping Boundary Turbulent kinetic energy (Movie) #12;Oscillating Flow over a Sloping Boundary Internal Wave Energy (Movie) #12;The Immersed Boundary

Wang, Deli

366

Computational fluid dynamic studies of chemical looping combustion systems.  

E-Print Network (OSTI)

??Responsible carbon management will be required for the future utilization of fossil fuels for power generation. One technology that is showing tremendous potential for carbon (more)

Mahalatkar, Kartikeya Krishnaji.

2010-01-01T23:59:59.000Z

367

European Conference on Computational Fluid Dynamics ECCOMAS CFD 2006  

E-Print Network (OSTI)

in industrialized countries. The major CVD include coronary (or ischaemic) heart disease (heart attack), cerebrovascular disease (stroke), hypertension (high blood pressure), rheumatic heart disease and heart failure. Damage to the heart tissues from CVD or from heart surgery can disrupt the natural electrical impulses

Frangi, Alejandro

368

European Conference on Computational Fluid Dynamics ECCOMAS CFD 2006  

E-Print Network (OSTI)

21 Uppsala, Sweden e-mail: damir.valiev@fysik.uu.se 3UPPMAX, Uppsala University, Box 337, 751 05¨uller, J. Rantakokko, P. L¨otstedt and M.A. Liberman of numerous efforts, the basic mechanisms controlling challenge of the combustion theory [6, 7, 8, 9]. The classical explanation of DDT [1, 2, 3] was due to flame

Müller,Bernhard

369

Designing high power targets with computational fluid dynamics (CFD)  

SciTech Connect

High power liquid hydrogen (LH2) targets, up to 850 W, have been widely used at Jefferson Lab for the 6 GeV physics program. The typical luminosity loss of a 20 cm long LH2 target was 20% for a beam current of 100 ?A rastered on a square of side 2 mm on the target. The 35 cm long, 2500 W LH2 target for the Qweak experiment had a luminosity loss of 0.8% at 180 ?A beam rastered on a square of side 4 mm at the target. The Qweak target was the highest power liquid hydrogen target in the world and with the lowest noise figure. The Qweak target was the first one designed with CFD at Jefferson Lab. A CFD facility is being established at Jefferson Lab to design, build and test a new generation of low noise high power targets.

Covrig, S. D. [Thomas Jefferson National Laboratory, Newport News, VA 23606 (United States)

2013-11-07T23:59:59.000Z

370

High-order computational fluid dynamics tools for aircraft design  

Science Journals Connector (OSTI)

...sustainable (green) aviation. In Recent advances in aircraft technology (ed...applications. In 47th AIAA Aerospace Sciences Meeting, AIAA 2009-176...mechanics. In Proc. 47th AIAA Aerospace Sciences Meeting and Exhibit. AIAA Paper...

2014-01-01T23:59:59.000Z

371

European Conference on Computational Fluid Dynamics ECCOMAS CFD 2006  

E-Print Network (OSTI)

aluminum tubes due to the passage of ethylene-oxygen detonation waves is presented. 1 INTRODUCTION The Center for Simulation of Dynamic Response of Materials at the California In- stitute of Technology has reliably with such a "weakly coupled" method, when the evolving interface geometry and velocities

Barr, Al

372

Modeling an EDC Cracker using Computational Fluid Dynamics (CFD).  

E-Print Network (OSTI)

?? The process used by the Norwegian company Hydro for making Vinyl Chloride Monomer (VCM) from natural gas and sodium chloride has been studied. A (more)

Kaggerud, Torbjrn Herder

2007-01-01T23:59:59.000Z

373

Computational fluid dynamics for turbomachinery internal air systems  

Science Journals Connector (OSTI)

...modelling developments are discussed...the main gas path, which...designers and turbine aerodynamicists...1996 CFD developments for turbine blade heat...Engines and Gas Turbines...compressor gas turbine internal...on future strategies towards understanding...

2007-01-01T23:59:59.000Z

374

Turbomachinery computational fluid dynamics: asymptotes and paradigm shifts  

Science Journals Connector (OSTI)

...a) and an aero-derivative gas turbine combustor (b). Even for simple...aero-engines and land-based gas turbines are very commonly cooled using...such as these: (a) part of a gas turbine secondary air system together with...

2007-01-01T23:59:59.000Z

375

High-order computational fluid dynamics tools for aircraft design  

Science Journals Connector (OSTI)

...future growth in aviation, reducing fuel burn, GHG emission and noise become imperative...aggressive goals in aircraft performance, fuel burn, GHG emission and noise, which is an...doi:10.1006/jcph.2000.6478 ) 45 Roe, PL . 1981 Approximate Riemann solvers...

2014-01-01T23:59:59.000Z

376

European Conference on Computational Fluid Dynamics ECCOMAS CFD 2006  

E-Print Network (OSTI)

217, 7500 AE Enschede, The Netherlands e-mail: {L.Pesch, J.J.W.vanderVegt}@math.utwente.nl web page. P´eriaux (Eds) c TU Delft, The Netherlands, 2006 A SPACE-TIME DISCONTINUOUS GALERKIN FINITE

Al Hanbali, Ahmad

377

European Conference on Computational Fluid Dynamics ECCOMAS CFD 2006  

E-Print Network (OSTI)

of Twente P.O. Box 217, Enschede, The Netherlands e-mail: o.bokhove@math.utwente.nl web page: google "Onno. P´eriaux (Eds) c TU Delft, The Netherlands, 2006 A (DIS)CONTINUOUS FINITE ELEMENT MODEL of Physics, University of Utrecht, Utrecht, The Netherlands Department of Applied Mathematics, University

Al Hanbali, Ahmad

378

ITP Chemicals: Technology Roadmap for Computational Fluid Dynamics, January 1999  

Energy.gov (U.S. Department of Energy (DOE))

As the 21st century approaches, the chemical industry faces considerable economic, environmental and societal challenges. CFD can assist the design and optimization of new and existing processes and products.

379

Computer System,  

NLE Websites -- All DOE Office Websites (Extended Search)

undergraduate summer institute http:institutes.lanl.govistisummer-school 2015 Computer System, Cluster, and Networking Summer Institute Purpose The Computer System,...

380

Fluid membranes can drive linear aggregation of adsorbed spherical nanoparticles  

E-Print Network (OSTI)

Using computer simulations we show that lipid membranes can mediate linear aggregation of spherical nanoparticles binding to it for a wide range of biologically relevant bending rigidities. This result is in net contrast with the isotropic aggregation of nanoparticles on fluid interfaces or the expected clustering of isotropic insertions in biological membranes. We present a phase diagram indicating where linear aggregation is expected, and compute explicitly the free energy barriers associated with linear and isotropic aggregation. Finally, we provide simple scaling arguments to explain this phenomenology.

Andela ari?; Angelo Cacciuto

2011-12-29T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Boron-isotope fractionation between tourmaline and fluid: an experimental re-investigation  

Science Journals Connector (OSTI)

The fractionation of boron isotopes between synthetic dravitic tourmaline and fluid was determined by hydrothermal experiments between 400 and 700C at 200MPa and at 500C, 500MPa. Tourmaline was crystallize...

Christian Meyer; Bernd Wunder; Anette Meixner

2008-08-01T23:59:59.000Z

382

On a class of exact solutions of the equations of motion of a second grade fluid  

Science Journals Connector (OSTI)

By means of Fourier sine transform, the velocity field corresponding to a flow of a suddenly moved flat plate in a second grade fluid is determined. The adequate solution for the Rayleigh-Stokes problem for th...

Prof. Dr. C. Fetec?u; Prof. J. Zierep

2001-01-01T23:59:59.000Z

383

Heat Transfer of Heat-Releasing Fluid in the Top Portion of a Closed Volume  

Science Journals Connector (OSTI)

The method of analytic estimates is used to determine the characteristics of steady-state free-convection heat transfer of a fluid with internal heat sources in the top part of a closed volume with different cond...

D. G. Grigoruk; P. S. Kondratenko

2004-03-01T23:59:59.000Z

384

Heat transfer in the flow of a viscoelastic fluid over a stretching sheet  

Science Journals Connector (OSTI)

The problem of heat transfer in the viscoelastic fluid flow over a stretching sheet is examined. ... such as the skin-friction coefficient and the heat transfer coefficient, are determined. It is found that the heat

P. Sam Lawrence; Dr. B. Nageswara Rao

1992-01-01T23:59:59.000Z

385

Two-fluid magnetic island dynamics in slab geometry: I -Isolated islands  

E-Print Network (OSTI)

that there be zero net electromagnetic force acting on the island. Finally, the ion polarization current correction determination of the island phase-velocity, and the calculation of the ion and electron fluid flow profiles

Fitzpatrick, Richard

386

Two-fluid magnetic island dynamics in slab geometry Richard Fitzpatrick  

E-Print Network (OSTI)

. Moreover, the island propaga- tion velocity is uniquely specified by the condition that there be zero net determination of the island propagation velocity, and the calculation of the ion and electron fluid flow

Fitzpatrick, Richard

387

DEVELOPMENT OF NEW DRILLING FLUIDS  

SciTech Connect

The goal of the project has been to develop new types of drill-in fluids (DIFs) and completion fluids (CFs) for use in natural gas reservoirs. Phase 1 of the project was a 24-month study to develop the concept of advanced type of fluids usable in well completions. Phase 1 tested this concept and created a kinetic mathematical model to accurately track the fluid's behavior under downhole conditions. Phase 2 includes tests of the new materials and practices. Work includes the preparation of new materials and the deployment of the new fluids and new practices to the field. The project addresses the special problem of formation damage issues related to the use of CFs and DIFs in open hole horizontal well completions. The concept of a ''removable filtercake'' has, as its basis, a mechanism to initiate or trigger the removal process. Our approach to developing such a mechanism is to identify the components of the filtercake and measure the change in the characteristics of these components when certain cleanup (filtercake removal) techniques are employed.

David B. Burnett

2003-08-01T23:59:59.000Z

388

Cutting Fluid Selection for Sustainable Design for Manufacturing: An Integrated Theory  

Science Journals Connector (OSTI)

Abstract Cutting fluids and its selection are very essential in manufacturing system. In order to get more sustainable yield, not only the economic and technical factors, but also the ecological factors for sustainable design for manufacturing. The aim of this research to select the optimum cutting fluid that minimizes the environmental impact (E), cost(C) and maximizing the quality (Q). In this model, criteria weights are computed using AHP method that ranking of the alternatives computed using VIKOR method. In this research, comparison has been made by taking the three cutting sustainable fluid v.i.z Traditional Cutting fluid, Syntilo 9930c and Syntilo R Plus cutting oil. The result shows that Syntilo 9930c is optimal in comparison with other.

Jagadish; Amitava Ray

2014-01-01T23:59:59.000Z

389

Making Computer Vision Computationally Efficient  

E-Print Network (OSTI)

Workloads 4 Parallelizing Computer Vision 4.1 Numerical9.1.1 Pattern analysis of computer vision workloads 9.1.23 Understanding Computer Vision 3.1 Patterns and

Sundaram, Narayanan

2012-01-01T23:59:59.000Z

390

Experimental and Computational Aerothermodynamics of a Mars Entry Vehicle  

Science Journals Connector (OSTI)

An aerothermodynamic database has been generated through both experimental testing and computational fluid dynamics simulations for a 70 deg sphere-cone configuration based on the NASA Mars-Pathfinder entry vehicle. The aerothermodynamics of several ...

Hollis Brian R.

1996-12-01T23:59:59.000Z

391

Isotope Geochemistry Of Minerals And Fluids From Newberry Volcano, Oregon |  

Open Energy Info (EERE)

Isotope Geochemistry Of Minerals And Fluids From Newberry Volcano, Oregon Isotope Geochemistry Of Minerals And Fluids From Newberry Volcano, Oregon Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Isotope Geochemistry Of Minerals And Fluids From Newberry Volcano, Oregon Details Activities (2) Areas (1) Regions (0) Abstract: Isotopic compositions were determined for hydrothermal quartz, calcite, and siderite from core samples of the Newberry 2 drill hole, Oregon. The Δ15O values for these minerals decrease with increasing temperatures. The values indicate that these hydrothermal minerals precipitated in isotopic equilibrium with water currently present in the reservoirs. The Δ18O values of quartz and calcite from the andesite and basalt flows (700-932 m) have isotopic values which require that the equilibrated water Δ18O values increase slightly (- 11.3 to -9.2‰) with

392

Multi-fluid cosmology: An illustration of fundamental principles  

E-Print Network (OSTI)

Our current understanding of the Universe depends on the interplay of several distinct "matter" components, which interact mainly through gravity, and electromagnetic radiation. The nature of the different components, and possible interactions, tends to be based on the notion of coupled perfect fluids (or scalar fields). This approach is somewhat naive, especially if one wants to be able to consider issues involving heat flow, dissipative mechanisms, or Bose-Einstein condensation of dark matter. We argue that a more natural starting point would be the multi-purpose variational relativistic multi-fluid system that has so far mainly been applied to neutron star astrophysics. As an illustration of the fundamental principles involved, we develop the formalism for determining the non-linear cosmological solutions to the Einstein equations for a general relativistic two-fluid model for a coupled system of matter (non-zero rest mass) and "radiation" (zero rest mass). The two fluids are allowed to interpenetrate and exhibit a relative flow with respect to each other, implying, in general, an anisotropic Universe. We use initial conditions such that the massless fluid flux dominates early on so that the situation is effectively that of a single fluid and one has the usual Friedmann-Lemaitre-Robertson-Walker (FLRW) spacetime. We find that there is a Bianchi I transition epoch out of which the matter flux dominates. The situation is then effectively that of a single fluid and the spacetime evolves towards the FLRW form. Such a transition opens up the possibility of imprinting observable consequences at the specific scale corresponding to the transition time.

G. L. Comer; Patrick Peter; N. Andersson

2012-03-21T23:59:59.000Z

393

Viscosity of a nucleonic fluid  

E-Print Network (OSTI)

The viscosity of nucleonic matter is studied both classically and in a quantum mechanical description. The collisions between particles are modeled as hard sphere scattering as a baseline for comparison and as scattering from an attractive square well potential. Properties associated with the unitary limit are developed which are shown to be approximately realized for a system of neutrons. The issue of near perfect fluid behavior of neutron matter is remarked on. Using some results from hard sphere molecular dynamics studies near perfect fluid behavior is discussed further.

Aram Z. Mekjian

2012-03-21T23:59:59.000Z

394

Compressor bleed cooling fluid feed system  

DOE Patents (OSTI)

A compressor bleed cooling fluid feed system for a turbine engine for directing cooling fluids from a compressor to a turbine airfoil cooling system to supply cooling fluids to one or more airfoils of a rotor assembly is disclosed. The compressor bleed cooling fluid feed system may enable cooling fluids to be exhausted from a compressor exhaust plenum through a downstream compressor bleed collection chamber and into the turbine airfoil cooling system. As such, the suction created in the compressor exhaust plenum mitigates boundary layer growth along the inner surface while providing flow of cooling fluids to the turbine airfoils.

Donahoo, Eric E; Ross, Christopher W

2014-11-25T23:59:59.000Z

395

CX-000954: Categorical Exclusion Determination | Department of...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

CX-000954: Categorical Exclusion Determination Building 94 Computational Science Computer Room 103 Renovation - Phase II CX(s) Applied: B1.29, B1.31 Date: 03012010...

396

Directed flow fluid rinse trough  

DOE Patents (OSTI)

Novel rinse troughs accomplish thorough uniform rinsing. The tanks are suitable for one or more essentially planar items having substantially the same shape. The troughs ensure that each surface is rinsed uniformly. The new troughs also require less rinse fluid to accomplish a thorough rinse than prior art troughs.

Kempka, Steven N. (9504 Lona La., Albuquerque, NM 87111); Walters, Robert N. (11872 LaGrange St., Boise, ID 83709)

1996-01-01T23:59:59.000Z

397

Directed flow fluid rinse trough  

DOE Patents (OSTI)

Novel rinse troughs accomplish thorough uniform rinsing. The tanks are suitable for one or more essentially planar items having substantially the same shape. The troughs ensure that each surface is rinsed uniformly. The new troughs also require less rinse fluid to accomplish a thorough rinse than prior art troughs. 9 figs.

Kempka, S.N.; Walters, R.N.

1996-07-02T23:59:59.000Z

398

Working fluid for Rankine cycle  

SciTech Connect

A Rankine cycle working fluid is disclosed containing a mixture of 2,2,3,3tetrafluoropropanol and water, which is low toxic, incombustible, nonexplosive, noncorrosive and stable, and also has a high critical temperature and forms azeotropic-like composition. It is suited for use in a rankine cycle using heat source of low temperature.

Aomi, H.; Enjo, N.

1980-11-11T23:59:59.000Z

399

Selection and analytical monitoring of backing pump fluids in semiconductor processes  

Science Journals Connector (OSTI)

Fluids in backing pumps must fulfill the following tasks: sealing lubricating protection against corrosion and the transportation of heat. In semiconductor processes additional demands are made on a pump fluid. It must be resistant to reactive substances. For the different processes such as etching chemical vapor deposition etc. different classes of fluids have proved to be effective in practice. This makes specific adaptation to a process possible. Regular control of the fluid is necessary to achieve safe operation. In general the quality of a fluid is controlled by determining its viscosity the total acid number and total base number and its ash content and an optical evaluation is made. With pump fluids coming from semiconductor processes specific analytical problems arise which require special treatment and analysis. Filtration extraction adsorption and degassing are good methods for treatment. The determination of decomposition products of the fluid and substances from the process chamber can be effected with the help of infrared spectroscopy. In addition mass spectroscopy elementary analysis and other chemical methods can be helpful in evaluating a pumping fluid.

Monika Kuhn; Paul Bachmann

1987-01-01T23:59:59.000Z

400

Computing and Computational Sciences Directorate - Computer Science...  

NLE Websites -- All DOE Office Websites (Extended Search)

Home Awards Awards Night 2012 R&D LEADERSHIP, DIRECTOR LEVEL Winner: Brian Worley Organization: Computational Sciences & Engineering Division Citation: For exemplary program...

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Elementary Determinants for Electrical Engineers  

Science Journals Connector (OSTI)

... electrical engineering, determinants are useful, and Prof. Fleming showed many years ago how the resistances of networks can be computed by their means. The very complicated formulae which telephone ...

1923-04-28T23:59:59.000Z

402

Inverse Fluid Convection Problems in Enclosures  

E-Print Network (OSTI)

Efficiency, security, and reliability of industrial and domestic processes essentially depend on the deep understanding of their actual processes of fluid flow and heat transfer. Actual processes of fluid flow control and ...

Zhao, Fu-Yun

2012-01-01T23:59:59.000Z

403

CRITICALITY CURVES FOR PLUTONIUM HYDRAULIC FLUID MIXTURES  

SciTech Connect

This Calculation Note performs and documents MCNP criticality calculations for plutonium (100% {sup 239}Pu) hydraulic fluid mixtures. Spherical geometry was used for these generalized criticality safety calculations and three geometries of neutron reflection are: {sm_bullet}bare, {sm_bullet}1 inch of hydraulic fluid, or {sm_bullet}12 inches of hydraulic fluid. This document shows the critical volume and critical mass for various concentrations of plutonium in hydraulic fluid. Between 1 and 2 gallons of hydraulic fluid were discovered in the bottom of HA-23S. This HA-23S hydraulic fluid was reported by engineering to be Fyrquel 220. The hydraulic fluid in GLovebox HA-23S is Fyrquel 220 which contains phosphorus. Critical spherical geometry in air is calculated with 0 in., 1 in., or 12 inches hydraulic fluid reflection.

WITTEKIND WD

2007-10-03T23:59:59.000Z

404

Engine with a solid working fluid  

Science Journals Connector (OSTI)

... fluids: the fluid may be steam, petrol vapour/air mixture or air (in the Stirling engine), but all depend on cycles involving simultaneous changes of temperature and pressure. Now ...

Robert W. Cahn

1975-05-22T23:59:59.000Z

405

Fluid sampling system for a nuclear reactor  

DOE Patents (OSTI)

A system of extracting fluid samples, either liquid or gas, from the interior of a nuclear reactor containment utilizes a jet pump. To extract the sample fluid, a nonradioactive motive fluid is forced through the inlet and discharge ports of a jet pump located outside the containment, creating a suction that draws the sample fluid from the containment through a sample conduit connected to the pump suction port. The mixture of motive fluid and sample fluid is discharged through a return conduit to the interior of the containment. The jet pump and means for removing a portion of the sample fluid from the sample conduit can be located in a shielded sample grab station located next to the containment. A non-nuclear grade active pump can be located outside the grab sampling station and the containment to pump the nonradioactive motive fluid through the jet pump.

Lau, Louis K. (Monroeville, PA); Alper, Naum I. (Monroeville, PA)

1994-01-01T23:59:59.000Z

406

An Anisotropic Fluid-Solid Model of the Mouse Heart  

SciTech Connect

A critical challenge in biomechanical simulations is the spatial discretization of complex fluid-solid geometries created from imaging. This is especially important when dealing with Lagrangian interfaces, as there must be at a minimum both geometric and topological compatibility between fluid and solid phases, with exact matching of the interfacial nodes being highly desirable. We have developed a solution to this problem and applied the approach to the creation of a 3D fluidsolid mesh of the mouse heart. First, a 50 micron isotropic MRI dataset of a perfusion-fixed mouse heart was segmented into blood, tissue, and background using a customized multimaterial connected fuzzy thresholding algorithm. Then, a multimaterial marching cubes algorithm was applied to produce two compatible isosurfaces, one for the blood-tissue boundary and one for the tissue-background boundary. A multimaterial smoothing algorithm that rigorously conserves volume for each phase simultaneously smoothed the isosurfaces. Next we applied novel automated meshing algorithms to generate anisotropic hybrid meshes with the number of layers and the desired element anisotropy for each material as the only input parameters. As the meshes are scale-invariant within a material and include boundary layer prisms, fluid-structure interaction computations would have a relative error equilibrated over the entire mesh. The resulting model is highly detailed mesh representation of the mouse heart, including features such as chordae and coronary vasculature, that is also maximally efficient to produce the best simulation results for the computational resources available

Carson, James P.; Kuprat, Andrew P.; Jiao, Xiangmin; del Pin, Facundo; Einstein, Daniel R.

2010-01-01T23:59:59.000Z

407

Aqueous absorption fluids. Annual report, July 1989-October 1990  

SciTech Connect

The report describes the third year of study of aqueous-based working fluids that will allow air-cooled absorption chiller operation. The successful development of such fluids will eliminate the need for cooling towers in gas-fired chiller equipment for residential and unitary markets and possibly allow for building heating with absorber heat. The thermophysical property measurements were completed and the vapor pressure and specific heat data were used to compute the enthalpy of LB621-H2O solutions. Solution film heat transfer coefficients were measured in the test sorber apparatus and a dramatic increase in film heat transfer was observed in the presence of heat transfer additives. Measured equilibrium and film heat transfer data were used in the single-stage absorption cycle computer model to analyze the potential performance of LB621-H2O; the analysis confirmed the superiority of LB621-H2O as a single-stage working fluid. In addition, thermal stability and corrosion rate tests demonstrated that LB621-H2O is stable and non-corrosive in a single-stage absorption chiller environment.

Langeliers, J.; Chandler, T.; Rockenfeller, U.

1990-11-01T23:59:59.000Z

408

Direct Measurements of Pore Fluid Density by Vibrating Tube Densimetry  

SciTech Connect

The densities of pore-confined fluids were measured for the first time by means of a vibrating tube method. Isotherms of total adsorption capacity were measured directly making the method complementary to the conventional gravimetric or volumetric/piezometric adsorption techniques, which yield the excess adsorption (the Gibbsian surface excess). A custom-made high-pressure, high-temperature vibrating tube densimeter (VTD) was used to measure the densities of subcritical and supercritical propane (between 35 C and 97 C) and supercritical carbon dioxide (between 32 C and 50 C) saturating hydrophobic silica aerogel (0.2 g/cm3, 90% porosity) synthesized inside Hastelloy U-tubes. Additionally, excess adsorption isotherms for supercritical CO2 and the same porous solid were measured gravimetrically using a precise magnetically-coupled microbalance. Pore fluid densities and total adsorption isotherms increased monotonically with increasing density of the bulk fluid, in contrast to excess adsorption isotherms, which reached a maximum at a subcritical density of the bulk fluid, and then decreased towards zero or negative values at supercritical densities. Compression of the confined fluid significantly beyond the density of the bulk liquid at the same temperature was observed at subcritical temperatures. The features of the isotherms of confined fluid density are interpreted to elucidate the observed behavior of excess adsorption. The maxima of excess adsorption were found to occur below the critical density of the bulk fluid at the conditions corresponding to the beginning of the plateau of total adsorption, marking the end of the transition of pore fluid to a denser, liquid-like pore phase. The results for propane and carbon dioxide showed similarity in the sense of the principle of corresponding states. No measurable effect of pore confinement on the liquid-vapor critical point was found. Quantitative agreement was obtained between excess adsorption isotherms determined from VTD total adsorption results and those measured gravimetrically at the same temperature, confirming the validity of the vibrating tube measurements. Vibrating tube densimetry was demonstrated as a novel experimental approach capable of providing the average density of pore-confined fluids.

Gruszkiewicz, Miroslaw {Mirek} S [ORNL; Rother, Gernot [ORNL; Wesolowski, David J [ORNL; Cole, David R [ORNL; Wallacher, Dirk [Helmholtz-Zentrum Berlin

2012-01-01T23:59:59.000Z

409

Specialized Materials and Fluids and Power Plants  

Energy.gov (U.S. Department of Energy (DOE))

Below are the project presentations and respective peer review results for Specialized Materials and Fluids and Power Plants.

410

Supercritical Fluid Attachment of Palladium Nanoparticles on...  

NLE Websites -- All DOE Office Websites (Extended Search)

Attachment of Palladium Nanoparticles on Aligned Carbon Nanotubes. Supercritical Fluid Attachment of Palladium Nanoparticles on Aligned Carbon Nanotubes. Abstract: Nanocomposite...

411

Fluid Interface Reactions, Structures and Transport  

NLE Websites -- All DOE Office Websites (Extended Search)

fluid by local bond relaxation, charge redistribution, dissolution, precipitation, sorption and porosity developmentdestruction. Heretofore, interfaces have been described...

412

Compute nodes  

NLE Websites -- All DOE Office Websites (Extended Search)

nodes Compute nodes Compute Node Configuration 5,576 nodes two 12-core Intel "Ivy Bridge" processors at 2.4GHz per node 24 cores per node (133,824 total cores) 1 AVX (vector)...

413

Cloud Computing  

SciTech Connect

Chicago Matters: Beyond Burnham (WTTW). Chicago has become a world center of "cloud computing." Argonne experts Pete Beckman and Ian Foster explain what "cloud computing" is and how you probably already use it on a daily basis.

Pete Beckman and Ian Foster

2009-12-04T23:59:59.000Z

414

Determination hydrophobic  

E-Print Network (OSTI)

of royalty provided that (1) each reproduction is done without alteration and (2) the Journal reference, of this paper may be copied or distributed royalty free without further permission by computer-based and other

Levitt, Michael

415

2014 GRADUATE STUDIES ENVIRONMENTAL FLUID MECHANICS  

E-Print Network (OSTI)

for Civil and Environmental Engineers · Stochastic Hydrology · Water Resources Management · Fluid Mechanics2014 GRADUATE STUDIES ENVIRONMENTAL FLUID MECHANICS AND WATER RESOURCES ENGINEERING RESEARCH AREAS SELECTED COURSES FACILITIES The Environmental Fluid Mechanics and Water Resources program at the Georgia

Wang, Yuhang

416

Data Computation  

Science Journals Connector (OSTI)

Data computation is the application of mathematical or... primary patient data , and analysis, synthesis, or evaluation of secondary patient data ...

2008-01-01T23:59:59.000Z

417

Instinctive computing  

Science Journals Connector (OSTI)

Instinctive computing is a computational simulation of biological and cognitive instincts. It is a meta-program of life, just like universal gravity in nature. It profoundly influences how we look, feel, think, and act. If we want a computer to be genuinely ...

Yang Cai

2007-01-01T23:59:59.000Z

418

NETL: Advanced Research - Computation Energy Sciences  

NLE Websites -- All DOE Office Websites (Extended Search)

Computational Energy Sciences > APECS Computational Energy Sciences > APECS Advanced Research Computational Energy Sciences APECS APECS Virtual Plant APECS (Advanced Process Engineering Co-Simulator) is the first simulation software to combine the disciplines of process simulation and computational fluid dynamics (CFD). This unique combination makes it possible for engineers to create "virtual plants" and to follow complex thermal and fluid flow phenomena from unit to unit across the plant. Advanced visualization software tools aid in analysis and optimization of the entire plant's performance. This tool can significantly reduce the cost of power plant design and optimization with an emphasis on multiphase flows critical to advanced power cycles. A government-industry-university collaboration (including DOE, NETL, Ansys/

419

Fluid Inclusion Analysis At Coso Geothermal Area (Norman & Moore, 2004) |  

Open Energy Info (EERE)

Fluid Inclusion Analysis At Coso Geothermal Area (Norman & Moore, 2004) Fluid Inclusion Analysis At Coso Geothermal Area (Norman & Moore, 2004) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Fluid Inclusion Analysis At Coso Geothermal Area (Norman & Moore, 2004) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Fluid Inclusion Analysis Activity Date 2004 Usefulness useful DOE-funding Unknown Exploration Basis To determine effectiveness of FIS for geothermal exploration Notes In order to test FIS for geothermal exploration, drill chips were analyzed from Coso well 83-16, which were selected at 1000 ft intervals by Joseph Moore. Sequential crushes done by our CFS (crushfast-scan) method (Norman 1996) show that chips have a high density of homogeneous fluid inclusions.

420

Petroleum fluids Pac expands solution of engineering problems  

SciTech Connect

A new set of calculator programs permits greatly simplified estimates of important oil and gas fluid properties. These programs can all be used individually or as subroutines for user-generated programs. But perhaps the most significant feature of this new Pac is the simple approach to handling the computational and dimensional aspects of reservoir engineering problems. The new Pac contains 18 programs that calculate properties for natural gases, oils, and oil-field brines. In addition to these main programs, the Pac contains a library of 54 subroutines for input, output, and fluid property calculations. Its modular design alows the user to easily write programs to solve more difficult reservoir engineering programs in a fraction of the time and program space required without the Pac. The programs are all contained in a module which can be plugged into any HP-41C or HP-41CV. 1 ref.

Meehan, D.N.

1982-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Application of Computational Physics: Blood Vessel Constrictions and Medical Infuses  

E-Print Network (OSTI)

Application of computation in many fields are growing fast in last two decades. Increasing on computation performance helps researchers to understand natural phenomena in many fields of science and technology including in life sciences. Computational fluid dynamic is one of numerical methods which is very popular used to describe those phenomena. In this paper we propose moving particle semi-implicit (MPS) and molecular dynamics (MD) to describe different phenomena in blood vessel. The effect of increasing the blood pressure on vessel wall will be calculate using MD methods, while the two fluid blending dynamics will be discussed using MPS. Result from the first phenomenon shows that around 80% of constriction on blood vessel make blood vessel increase and will start to leak on vessel wall, while from the second phenomenon the result shows the visualization of two fluids mixture (drugs and blood) influenced by ratio of drugs debit to blood debit. Keywords: molecular dynamic, blood vessel, fluid dynamic, movin...

Suprijadi,; Subekti, Petrus; Viridi, Sparisoma

2013-01-01T23:59:59.000Z

422

Non-invasive fluid density and viscosity measurement  

SciTech Connect

The noninvasively measurement of the density and viscosity of static or flowing fluids in a section of pipe such that the pipe performs as the sensing apparatus, is described. Measurement of a suitable structural vibration resonance frequency of the pipe and the width of this resonance permits the density and viscosity to be determined, respectively. The viscosity may also be measured by monitoring the decay in time of a vibration resonance in the pipe.

Sinha, Dipen N. (Los Alamos, NM)

2012-05-01T23:59:59.000Z

423

Fluid dynamics kill Wyoming icicle  

SciTech Connect

Control of a blowout in which a portion of the drill collar string was extending through the rotary table and into the derrick was compounded by ice building up on the derrick and substructure. However, the momentum kill procedure proved successful. Topics considered in this paper include oil wells, natural gas wells, sleeves, rotary drills, drilling rigs, fluid mechanics, occupational safety, blowouts, drill pipes, rotary drilling, ice removal, and freezing.

Grace, R.D.

1987-04-01T23:59:59.000Z

424

Use of Clays as Drilling Fluids and Filters  

Science Journals Connector (OSTI)

In geotechnical engineering, drilling fluid is a fluid used to drill boreholes into the earth. In drilling rigs, drilling fluids help to do drill for exploration of oil and natural gas. Liquid drilling fluid is o...

Swapna Mukherjee

2013-01-01T23:59:59.000Z

425

Experimental determination of radiated internal wave power without pressure field data  

SciTech Connect

We present a method to determine, using only velocity field data, the time-averaged energy flux (J) and total radiated power P for two-dimensional internal gravity waves. Both (J) and P are determined from expressions involving only a scalar function, the stream function ?. We test the method using data from a direct numerical simulation for tidal flow of a stratified fluid past a knife edge. The results for the radiated internal wave power given by the stream function method agree to within 0.5% with results obtained using pressure and velocity data from the numerical simulation. The results for the radiated power computed from the stream function agree well with power computed from the velocity and pressure if the starting point for the stream function computation is on a solid boundary, but if a boundary point is not available, care must be taken to choose an appropriate starting point. We also test the stream function method by applying it to laboratory data for tidal flow past a knife edge, and the results are found to agree with the direct numerical simulation. The supplementary material includes a Matlab code with a graphical user interface that can be used to compute the energy flux and power from two-dimensional velocity field data.

Lee, Frank M.; Morrison, P. J. [Physics Department and Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 787121192 (United States)] [Physics Department and Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 787121192 (United States); Paoletti, M. S.; Swinney, Harry L. [Physics Department, The University of Texas at Austin, Austin, Texas 787121192 (United States)] [Physics Department, The University of Texas at Austin, Austin, Texas 787121192 (United States)

2014-04-15T23:59:59.000Z

426

From detonation to diapers: Los Alamos computer codes at core of advanced  

NLE Websites -- All DOE Office Websites (Extended Search)

From detonation to diapers From detonation to diapers Los Alamos computer codes at core of advanced manufacturing tools The computer codes used for predictive fluid modeling are part of the Los Alamos Computational Fluid Dynamics Library. July 27, 2011 This simulation of a droplet of liquid falling into a pool of liquid was modeled using Los Alamos National Laboratory's Computational Fluid Dynamics Library This simulation of a droplet of liquid falling into a pool of liquid was modeled using Los Alamos National Laboratory's Computational Fluid Dynamics Library (CFDLib), which was also used by Procter and Gamble to simulate a manufacturing process. The computer code is now available to help American industries become more competitive. Contact James Rickman Communicatons Office (505) 665-9203

427

Fluid Inclusion Analysis | Open Energy Information  

Open Energy Info (EERE)

Fluid Inclusion Analysis Fluid Inclusion Analysis Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Fluid Inclusion Analysis Details Activities (20) Areas (11) Regions (1) NEPA(0) Exploration Technique Information Exploration Group: Lab Analysis Techniques Exploration Sub Group: Fluid Lab Analysis Parent Exploration Technique: Fluid Lab Analysis Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Fluid composition at a point in time and space Thermal: The minimum temperature of fluid inclusion formation Cost Information Low-End Estimate (USD): 17.571,757 centUSD 0.0176 kUSD 1.757e-5 MUSD 1.757e-8 TUSD / sample Median Estimate (USD): 17.571,757 centUSD 0.0176 kUSD 1.757e-5 MUSD 1.757e-8 TUSD / sample High-End Estimate (USD): 26.782,678 centUSD

428

Computing and Computational Sciences Directorate - Divisions  

NLE Websites -- All DOE Office Websites (Extended Search)

CCSD Divisions Computational Sciences and Engineering Computer Sciences and Mathematics Information Technolgoy Services Joint Institute for Computational Sciences National Center...

429

Hydrostatic bearings for a turbine fluid flow metering device  

DOE Patents (OSTI)

A rotor assembly fluid metering device has been improved by development of a hydrostatic bearing fluid system which provides bearing fluid at a common pressure to rotor assembly bearing surfaces. The bearing fluid distribution system produces a uniform film of fluid between bearing surfaces and allows rapid replacement of bearing fluid between bearing surfaces, thereby minimizing bearing wear and corrosion. 3 figs.

Fincke, J.R.

1982-05-04T23:59:59.000Z

430

Rotational viscometer for high-pressure, high-temperature fluids  

DOE Patents (OSTI)

The invention is a novel rotational viscometer which is well adapted for use with fluids at high temperatures and/or pressures. In one embodiment, the viscometer include a substantially non-magnetic tube having a closed end and having an open end in communication with a fluid whose viscosity is to be determined. An annular drive magnet is mounted for rotation about the tube. The tube encompasses and supports a rotatable shaft assembly which carries a rotor, or bob, for insertion in the fluid. Affixed to the shaft are (a) a second magnet which is magnetically coupled to the drive magnet and (b) a third magnet. In a typical operation, the drive magnet is rotated to turn the shaft assembly while the shaft rotor is immersed in the fluid. The viscous drag on the rotor causes the shaft assembly to lag the rotation of the drive magnet by an amount which is a function of the amount of viscous drag. A first magnetic pickup generates a waveform whose phase is a function of the angular position of the drive magnet. A second magnetic pickup generates a waveform whose phase is a function of the angular position of the third magnet. Means are provided to generate an output indicative of the phase difference between the two waveforms. The viscometer is comparatively simple, inexpensive, rugged, and does not require shaft seals.

Carr, K.R.

1983-06-06T23:59:59.000Z

431

Density fluctuations in lattice-Boltzmann simulations of multiphase fluids in a closed system  

SciTech Connect

A two-dimensional single component two-phase lattice Boltzmann model was used to simulate the Rayleigh-Taylor instability in a closed system. Spatiotemporally variable densities were generated by gravity acting on the fluid density. The density fluctuations were triggered by rapid changes in the fluid velocity induced by changes in the interface geometry and impact of the dense fluid on the rigid lower boundary of the computational domain. The ratio of the maximum density fluctuations to the maximum fluid velocity increased more rapidly at low velocities than at high velocities. The ratio of the maximum density fluctuations in the dense phase to its maximum velocity was on the order of the inverse of the sound speed. The solution became unstable when the density-based maximum local Knudsen number exceeded 0.13.

H. Basagaoglu; Paul Meakin

2007-02-01T23:59:59.000Z

432

A simplified thermohydrodynamic model for fluid film bearings. Final report, February 15, 1992--February 15, 1994  

SciTech Connect

We aim to develop a simplified yet realistic model of fluid film lubrication under thermohydrodynamic conditions, with significant thermal and elastic deformation of the bearing pads. The principal thrust is transfer of technology from the researcher to the industrial designer: the end product will include two user-friendly computer programs, one for journal bearings and the other for thrust bearings, to be used for bearing design in interactive mode on a personal computer.

Szeri, A.Z. [Pittsburgh Univ., PA (United States). Dept. of Mechanical Engineering

1994-03-01T23:59:59.000Z

433

Identity awareness on tabletop computers.  

E-Print Network (OSTI)

??Most multi-user horizontal interactive surfaces, or tabletop computers, cannot determine which user has performed a given action. These tabletops are less capable than identity-aware (IA) (more)

Partridge, Grant

2011-01-01T23:59:59.000Z

434

Multiple source/multiple target fluid transfer apparatus  

DOE Patents (OSTI)

A fluid transfer apparatus includes: (a) a plurality of orifices for connection with fluid sources; (b) a plurality of orifices for connection with fluid targets; (c) a set of fluid source conduits and fluid target conduits associated with the orifices; (d) a pump fluidically interposed between the source and target conduits to transfer fluid there between; (e) a purge gas conduit in fluid communication with the fluid source conduits, fluid target conduits and pump to receive and pass a purge gas under pressure; (f) a solvent conduit in fluid communication with the fluid source conduits, fluid target conduits and pump to receive and pass solvent, the solvent conduit including a solvent valve; (g) pump control means for controlling operation of the pump; (h) purge gas valve control means for controlling operation of the purge gas valve to selectively impart flow of purge gas to the fluid source conduits, fluid target conduits and pump; (i) solvent valve control means for controlling operation of the solvent valve to selectively impart flow of solvent to the fluid source conduits, fluid target conduits and pump; and (j) source and target valve control means for controlling operation of the fluid source conduit valves and the fluid target conduit valves to selectively impart passage of fluid between a selected one of the fluid source conduits and a selected one of the fluid target conduits through the pump and to enable passage of solvent or purge gas through selected fluid source conduits and selected fluid target conduits. 6 figs.

Turner, T.D.

1997-08-26T23:59:59.000Z

435

Cloud Computing.  

E-Print Network (OSTI)

?? Cloud computing has been given a great deal of attention during recent years. Almost all the technology market leaders and leading hosting service providers (more)

Siddiqui, Muhammad Anas

2013-01-01T23:59:59.000Z

436

Immersible solar heater for fluids  

DOE Patents (OSTI)

An immersible solar heater comprising a light-absorbing panel attached to a frame for absorbing heat energy from the light and transferring the absorbed heat energy directly to the fluid in which the heater is immersed. The heater can be used to heat a swimming pool, for example, and is held in position and at a preselected angle by a system of floats, weights and tethers so that the panel can operate efficiently. A skid can be used in one embodiment to prevent lateral movement of the heater along the bottom of the pool. Alternative embodiments include different arrangements of the weights, floats and tethers and methods for making the heater.

Kronberg, James W. (Aiken, SC)

1995-01-01T23:59:59.000Z

437

Investigation of two-fluid methods for Large Eddy Simulation of spray combustion in Gas Turbines  

E-Print Network (OSTI)

Investigation of two-fluid methods for Large Eddy Simulation of spray combustion in Gas Turbines the EL method well suited for gas turbine computations, but RANS with the EE approach may also be found and coupled with the LES solver of the gas phase. The equations used for each phase and the coupling terms

438

Fusion Engineering and Design 82 (2007) 22172225 Integrated thermo-fluid analysis towards helium flow  

E-Print Network (OSTI)

Fusion Engineering and Design 82 (2007) 2217­2225 Integrated thermo-fluid analysis towards helium. Andob, I. Komadab a Fusion Engineering Sciences, Mechanical and Aerospace Eng. Department, University the ITER test blanket module (TBM) warrants the need of extensive computer aided engineering (CAE

Abdou, Mohamed

439

Cytospin preparations are superior to common smears in the detection of monosodium urate crystals in low-cellular synovial fluids  

Science Journals Connector (OSTI)

In cases of gout with a low synovial fluid (SF) ... ,000/?l) SF samples of patients with gout. We determined the number of MSU crystals ... samples of 17 patients with MSU-crystal-proven gout and compared the two...

Christoph Robier; Mariana Stettin; Franz Quehenberger

2014-12-01T23:59:59.000Z

440

GASFLOW: A computational model to analyze accidents in nuclear containment and facility buildings  

SciTech Connect

GASFLOW is a finite-volume computer code that solves the time-dependent, compressible Navier-Stokes equations for multiple gas species. The fluid-dynamics algorithm is coupled to the chemical kinetics of combusting liquids or gases to simulate diffusion or propagating flames in complex geometries of nuclear containment or confinement and facilities` buildings. Fluid turbulence is calculated to enhance the transport and mixing of gases in rooms and volumes that may be connected by a ventilation system. The ventilation system may consist of extensive ductwork, filters, dampers or valves, and fans. Condensation and heat transfer to walls, floors, ceilings, and internal structures are calculated to model the appropriate energy sinks. Solid and liquid aerosol behavior is simulated to give the time and space inventory of radionuclides. The solution procedure of the governing equations is a modified Los Alamos ICE`d-ALE methodology. Complex facilities can be represented by separate computational domains (multiblocks) that communicate through overlapping boundary conditions. The ventilation system is superimposed throughout the multiblock mesh. Gas mixtures and aerosols are transported through the free three-dimensional volumes and the restricted one-dimensional ventilation components as the accident and fluid flow fields evolve. Combustion may occur if sufficient fuel and reactant or oxidizer are present and have an ignition source. Pressure and thermal loads on the building, structural components, and safety-related equipment can be determined for specific accident scenarios. GASFLOW calculations have been compared with large oil-pool fire tests in the 1986 HDR containment test T52.14, which is a 3000-kW fire experiment. The computed results are in good agreement with the observed data.

Travis, J.R. [Science Applications International Corp., Albuquerque, NM (United States); Nichols, B.D.; Wilson, T.L.; Lam, K.L.; Spore, J.W.; Niederauer, G.F. [Los Alamos National Lab., NM (United States)

1993-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

GASFLOW: A computational model to analyze accidents in nuclear containment and facility buildings  

SciTech Connect

GASFLOW is a finite-volume computer code that solves the time-dependent, compressible Navier-Stokes equations for multiple gas species. The fluid-dynamics algorithm is coupled to the chemical kinetics of combusting liquids or gases to simulate diffusion or propagating flames in complex geometries of nuclear containment or confinement and facilities' buildings. Fluid turbulence is calculated to enhance the transport and mixing of gases in rooms and volumes that may be connected by a ventilation system. The ventilation system may consist of extensive ductwork, filters, dampers or valves, and fans. Condensation and heat transfer to walls, floors, ceilings, and internal structures are calculated to model the appropriate energy sinks. Solid and liquid aerosol behavior is simulated to give the time and space inventory of radionuclides. The solution procedure of the governing equations is a modified Los Alamos ICE'd-ALE methodology. Complex facilities can be represented by separate computational domains (multiblocks) that communicate through overlapping boundary conditions. The ventilation system is superimposed throughout the multiblock mesh. Gas mixtures and aerosols are transported through the free three-dimensional volumes and the restricted one-dimensional ventilation components as the accident and fluid flow fields evolve. Combustion may occur if sufficient fuel and reactant or oxidizer are present and have an ignition source. Pressure and thermal loads on the building, structural components, and safety-related equipment can be determined for specific accident scenarios. GASFLOW calculations have been compared with large oil-pool fire tests in the 1986 HDR containment test T52.14, which is a 3000-kW fire experiment. The computed results are in good agreement with the observed data.

Travis, J.R. (Science Applications International Corp., Albuquerque, NM (United States)); Nichols, B.D.; Wilson, T.L.; Lam, K.L.; Spore, J.W.; Niederauer, G.F. (Los Alamos National Lab., NM (United States))

1993-01-01T23:59:59.000Z

442

Apparatus for unloading pressurized fluid  

DOE Patents (OSTI)

An apparatus is described for unloading fluid, preferably pressurized gas, from containers in a controlled manner that protects the immediate area from exposure to the container contents. The device consists of an unloading housing, which is enclosed within at least one protective structure, for receiving the dispensed contents of the steel container, and a laser light source, located external to the protective structure, for opening the steel container instantaneously. The neck or stem of the fluid container is placed within the sealed interior environment of the unloading housing. The laser light passes through both the protective structure and the unloading housing to instantaneously pierce a small hole within the stem of the container. Both the protective structure and the unloading housing are specially designed to allow laser light passage without compromising the light's energy level. Also, the unloading housing allows controlled flow of the gas once it has been dispensed from the container. The external light source permits remote operation of the unloading device. 2 figures.

Rehberger, K.M.

1994-01-04T23:59:59.000Z

443

Computation of multi-material interactions using point method  

SciTech Connect

Calculations of fluid flows are often based on Eulerian description, while calculations of solid deformations are often based on Lagrangian description of the material. When the Eulerian descriptions are used to problems of solid deformations, the state variables, such as stress and damage, need to be advected, causing significant numerical diffusion error. When Lagrangian methods are used to problems involving large solid deformat ions or fluid flows, mesh distortion and entanglement are significant sources of error, and often lead to failure of the calculation. There are significant difficulties for either method when applied to problems involving large deformation of solids. To address these difficulties, particle-in-cell (PIC) method is introduced in the 1960s. In the method Eulerian meshes stay fixed and the Lagrangian particles move through the Eulerian meshes during the material deformation. Since its introduction, many improvements to the method have been made. The work of Sulsky et al. (1995, Comput. Phys. Commun. v. 87, pp. 236) provides a mathematical foundation for an improved version, material point method (MPM) of the PIC method. The unique advantages of the MPM method have led to many attempts of applying the method to problems involving interaction of different materials, such as fluid-structure interactions. These problems are multiphase flow or multimaterial deformation problems. In these problems pressures, material densities and volume fractions are determined by satisfying the continuity constraint. However, due to the difference in the approximations between the material point method and the Eulerian method, erroneous results for pressure will be obtained if the same scheme used in Eulerian methods for multiphase flows is used to calculate the pressure. To resolve this issue, we introduce a numerical scheme that satisfies the continuity requirement to higher order of accuracy in the sense of weak solutions for the continuity equations. Numerical examples are given to demonstrate the new scheme.

Zhang, Duan Z [Los Alamos National Laboratory; Ma, Xia [Los Alamos National Laboratory; Giguere, Paul T [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

444

Computing Handbook Set -Computer Science (Volume I) Chapter: DNA Computing  

E-Print Network (OSTI)

Computing Handbook Set - Computer Science (Volume I) Chapter: DNA Computing Sudhanshu Garg, Reem. DNA computing is a class of molecular computing that does computation by the use of reactions chemistry, biochemistry, physics, material science, and computer science. This chapter surveys the field

Reif, John H.

445

System and method for filling a plurality of isolated vehicle fluid circuits through a common fluid fill port  

SciTech Connect

A vehicle having multiple isolated fluid circuits configured to be filled through a common fill port includes a first fluid circuit disposed within the vehicle, the first fluid circuit having a first fill port, a second fluid circuit disposed within the vehicle, and a conduit defining a fluid passageway between the first fluid circuit and second fluid circuit, the conduit including a valve. The valve is configured such that the first and second fluid circuits are fluidly coupled via the passageway when the valve is open, and are fluidly isolated when the valve is closed.

Sullivan, Scott C; Fansler, Douglas

2014-10-14T23:59:59.000Z

446

Studies of complexity in fluid systems  

SciTech Connect

This is the final report of Grant DE-FG02-92ER25119, ''Studies of Complexity in Fluids'', we have investigated turbulence, flow in granular materials, singularities in evolution of fluid surfaces and selective withdrawal fluid flows. We have studied numerical methods for dealing with complex phenomena, and done simulations on the formation of river networks. We have also studied contact-line deposition that occurs in a drying drop.

Nagel, Sidney R.

2000-06-12T23:59:59.000Z

447

Vibratory pumping of a free fluid stream  

DOE Patents (OSTI)

A vibratory fluid pump having a force generator for generating asymmetric periodic waves or oscillations connected to one end of one or more fluid conveyance means, such as filaments. The opposite ends of the filaments are connected to springs. Fluid introduced onto the filaments will traverse along the filaments according to the magnitude of the positive and negative excursions of the periodic waves or oscillations, and can be recovered from the filaments.

Merrigan, Michael A. (Santa Cruz, NM); Woloshun, Keith A. (Los Alamos, NM)

1990-01-01T23:59:59.000Z

448

Vibratory pumping of a free fluid stream  

DOE Patents (OSTI)

A vibratory fluid pump is described having a force generator for generating asymmetric periodic waves or oscillations connected to one end of one or more fluid conveyance means, such as filaments. The opposite ends of the filaments are connected to springs. Fluid introduced onto the filaments will traverse along the filaments according to the magnitude of the positive and negative excursions of the periodic waves or oscillations, and can be recovered from the filaments. 3 figs.

Merrigan, M.A.; Woloshun, K.A.

1990-11-13T23:59:59.000Z

449

Mechanical Computation: its Computational Complexity and Technologies  

E-Print Network (OSTI)

Mechanical Computation: its Computational Complexity and Technologies Chapter, Encyclopedia Importance II. Introduction to Computational Complexity III. Computational Complexity of Mechanical Devices and their Movement Problems IV. Concrete Mechanical Computing Devices V. Future Directions VI. Bibliography Glossary

Reif, John H.

450

Hydrostatic bearings for a turbine fluid flow metering device  

DOE Patents (OSTI)

A rotor assembly fluid metering device has been improved by development of a hydrostatic bearing fluid system which provides bearing fluid at a common pressure to rotor assembly bearing surfaces. The bearing fluid distribution system produces a uniform film of fluid distribution system produces a uniform film of fluid between bearing surfaces and allows rapid replacement of bearing fluid between bearing surfaces, thereby minimizing bearing wear and corrosion.

Fincke, J.R.

1980-05-02T23:59:59.000Z

451

Heat Transfer Fluids Containing Nanoparticles | Argonne National...  

NLE Websites -- All DOE Office Websites (Extended Search)

Heat Transfer Fluids Containing Nanoparticles Technology available for licensing: A stable, nonreactive nanofluid that exhibits enhanced heat transfer properties with only a...

452

DISPLAYING AND INTERPRETING FLUID INCLUSION STRATIGRAPHY ANALYSES...  

Open Energy Info (EERE)

This is the fourth paper in a series on developing fluid inclusion stratigraphy (FIS) as a logging tool for geothermal bore holes. Here we address methods of displaying...

453

Fluid inclusion geochemistry of halite from the Silurian A-1 Evaporite, Michigan Basin  

SciTech Connect

Fluids trapped in primary, inclusion-rich halite from the Silurian A-1 Evaporite of the Michigan Basin were analyzed to determine their elemental and isotopic composition and so constrain the fluid chemistry and regional variability of parent brines. The samples were collected from stratigraphically more complete basin center and basin margin cores than hitherto have been available. These include both inclusion-rich whole rock chips and fluids leached with isopropanol from crushed, inclusion-rich halite. Elemental ratios were determined relative to Mg, which is present only in the fluid phase of monomineralic halite samples and acts as a normalizing parameter against which to quantify fluid inclusion chemistry. Stable isotope ratios were determined on fluids collected from inclusion-rich halite by vacuum-thermal decrepitation. Inclusion fluids define a geochemical trend characterized by a Ca:Mg ratio of 1.4 [+-] 0.47, an Sr:Mg ratio of 0.015 [+-] 0.004 and a K:Mg ratio of 0.5 [+-] 0.17. Fluids are also depleted in SO[sub 4]. Importantly, these values are significantly different from any Michigan Basin formation brines and also cannot be derived from evaporation of modern seawater without extensive diagenetic modification. Two explanations of the data are possible. Pervasive syndepositional dolomitization and anhydrite precipitation may have altered Silurian brines of initial modern seawater composition, as has been suggested for similar data. However, consistently high cation ratios in the A-1 Evaporite on a regional scale demand striking uniformity in the timing and location of such reactions. Alternatively, Silurian seawater may have had elevated Ca:Mg, Sr:Mg and possibly K:Mg ratios relative to modern seawater.

Leibold, A.W.; Walter, L.M.; Huston, T.J.; O'Neil, J.R. (Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Geological Sciences)

1992-01-01T23:59:59.000Z

454

Particle-fluid heat/mass transfer: Newtonian and non-Newtonian fluids  

Science Journals Connector (OSTI)

A new model based on the boundary layer analysis is developed for particle-fluid heat/mass transfer. The proposed model enables a unified consideration ... results with data for Newtonian and non-Newtonian fluids

Y. Kawase

1992-01-01T23:59:59.000Z

455

Identification of fluids and an interface between fluids  

DOE Patents (OSTI)

Complex impedance measured over a predefined frequency range is used to determine the identity of different oils in a column. The location of an interface between the oils is determined from the percent frequency effects of the complex impedance measured across the interface. 4 figs.

Lee, D.O.; Wayland, J.R. Jr.

1988-03-10T23:59:59.000Z

456

Parallel Computational Strategies for Viscous Hydrodynamics with Applications to Microfluidics  

Science Journals Connector (OSTI)

Determination of the motion of particles in a viscous fluid is a problem found in disciplines including colloid science, suspension rheology and protein science. These low-Reynolds-number flows also from the basi...

Sangtae Kim

2000-01-01T23:59:59.000Z

457

Melting of albite and dehydration of brucite in H2ONaCl fluids to 9 kbars and 700900C: implications for partial melting and water activities during high pressure metamorphism  

Science Journals Connector (OSTI)

?The melting reaction: albite(solid)+ H2O(fluid) =albite-H2O(melt) has been determined in the presence of H2ONaCl fluids at 5 and 9.2?kbar, and results compared with those obtained in presence of H2OCO2 fluids....

Kirill I. Shmulovich; C. M. Graham

1996-08-01T23:59:59.000Z

458

Integrated acoustic phase separator and multiphase fluid composition monitoring apparatus and method  

DOE Patents (OSTI)

An apparatus and method for down hole gas separation from the multiphase fluid flowing in a wellbore or a pipe, for determining the quantities of the individual components of the liquid and the flow rate of the liquid, and for remixing the component parts of the fluid after which the gas volume may be measured, without affecting the flow stream, are described. Acoustic radiation force is employed to separate gas from the liquid, thereby permitting measurements to be separately made for these two components; the liquid (oil/water) composition is determined from ultrasonic resonances; and the gas volume is determined from capacitance measurements. Since the fluid flows around and through the component parts of the apparatus, there is little pressure difference, and no protection is required from high pressure differentials.

Sinha, Dipen N

2014-02-04T23:59:59.000Z

459

Laser microfluidics : fluid actuation by light Laser microfluidics: fluid actuation by light  

E-Print Network (OSTI)

Laser microfluidics : fluid actuation by light Laser microfluidics: fluid actuation by light Jean.delville@cpmoh.u-bordeaux1.fr Abstract: The development of microfluidic devices is still hindered by the lack of robust to extend this concept to microfluidic two-phase flows. First, we investigate the destabilization of fluid

Paris-Sud XI, Université de

460

Immersible solar heater for fluids  

DOE Patents (OSTI)

An immersible solar heater is described comprising a light-absorbing panel attached to a frame for absorbing heat energy from the light and transferring the absorbed heat energy directly to the fluid in which the heater is immersed. The heater can be used to heat a swimming pool, for example, and is held in position and at a preselected angle by a system of floats, weights and tethers so that the panel can operate efficiently. A skid can be used in one embodiment to prevent lateral movement of the heater along the bottom of the pool. Alternative embodiments include different arrangements of the weights, floats and tethers and methods for making the heater.

Hazen, T.C.; Fliermans, C.B.

1994-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Immersible solar heater for fluids  

DOE Patents (OSTI)

An immersible solar heater is described comprising a light-absorbing panel attached to a frame for absorbing heat energy from the light and transferring the absorbed heat energy directly to the fluid in which the heater is immersed. The heater can be used to heat a swimming pool, for example, and is held in position and at a preselected angle by a system of floats, weights and tethers so that the panel can operate efficiently. A skid can be used in one embodiment to prevent lateral movement of the heater along the bottom of the pool. Alternative embodiments include different arrangements of the weights, floats and tethers and methods for making the heater. 11 figs.

Kronberg, J.W.

1995-07-11T23:59:59.000Z

462

Hamilton's equations for a fluid membrane  

E-Print Network (OSTI)

Consider a homogenous fluid membrane described by the Helfrich-Canham energy, quadratic in the mean curvature of the membrane surface. The shape equation that determines equilibrium configurations is fourth order in derivatives and cubic in the mean curvature. We introduce a Hamiltonian formulation of this equation which dismantles it into a set of coupled first order equations. This involves interpreting the Helfrich-Canham energy as an action; equilibrium surfaces are generated by the evolution of space curves. Two features complicate the implementation of a Hamiltonian framework: (i) The action involves second derivatives. This requires treating the velocity as a phase space variable and the introduction of its conjugate momentum. The canonical Hamiltonian is constructed on this phase space. (ii) The action possesses a local symmetry -- reparametrization invariance. The two labels we use to parametrize points on the surface are themselves physically irrelevant. This symmetry implies primary constraints, one for each label, that need to be implemented within the Hamiltonian. The two lagrange multipliers associated with these constraints are identified as the components of the acceleration tangential to the surface. The conservation of the primary constraints imply two secondary constraints, fixing the tangential components of the momentum conjugate to the position. Hamilton's equations are derived and the appropriate initial conditions on the phase space variables are identified. Finally, it is shown how the shape equation can be reconstructed from these equations.

Riccardo Capovilla; Jemal Guven; Efrain Rojas

2005-05-25T23:59:59.000Z

463

Foam vessel for cryogenic fluid storage  

DOE Patents (OSTI)

Cryogenic storage and separator vessels made of polyolefin foams are disclosed, as are methods of storing and separating cryogenic fluids and fluid mixtures using these vessels. In one embodiment, the polyolefin foams may be cross-linked, closed-cell polyethylene foams with a density of from about 2 pounds per cubic foot to a density of about 4 pounds per cubic foot.

Spear, Jonathan D (San Francisco, CA)

2011-07-05T23:59:59.000Z

464

It's The Fluids SEG Honorary Lecture  

E-Print Network (OSTI)

Coarse Sand w/o THF-Hydrates Coarse Sand w/ THF-Hydrates #12;Guest Molecules Gas Hydrate Crystal information please visit: #12;·WATER and BRINE (BRINE = H2O + Salt) ·HYDROCARBONS Oil Gas TYPES of PORE FLUIDS Gas Mixtures ·DRILLING MUD ·PRODUCTION FLUIDS Miscible Injectants (CO2, Enriched Gas) #12;From Ivar

465

Dense colloidal fluids form denser amorphous sediments  

E-Print Network (OSTI)

Dense colloidal fluids form denser amorphous sediments Shir R. Libera,b , Shai Borohovicha of their randomly packed solid sediments. We demonstrate that the most dilute fluids of colloidal hard spheres form loosely packed sediments, where the volume fraction of the particles approaches in frictional systems

Schofield, Andrew B.

466

Supercritical Fluid Extraction of Wood Pulps  

Science Journals Connector (OSTI)

......capillary column inlet system which was main tained...great concern in this study because (a) their relative...McNally and J.R. Wheeler. J. Chromatogr. 447...Chaplin, and N.R. Foster. J. Supercrit. Fluids...Wells, and N.R. Foster. J. Supercrit. Fluids......

A.J. Sequeira; L.T. Taylor

1992-10-01T23:59:59.000Z

467

Engineering Insights 2006 Complex Fluids Design Consortium  

E-Print Network (OSTI)

Engineering Insights 2006 Complex Fluids Design Consortium (CFDC) www.mrl.ucsb.edu/cfdc Overview;Engineering Insights 2006 Objectives -- continued · Create a world-class center for complex fluid and soft and Research Highlights Glenn Fredrickson October 18, 2006 #12;Engineering Insights 2006 What is the CFDC

California at Santa Barbara, University of

468

Continuum-kinetic-microscopic model of lung clearance due to core-annular fluid entrainment  

SciTech Connect

The human lung is protected against aspirated infectious and toxic agents by a thin liquid layer lining the interior of the airways. This airway surface liquid is a bilayer composed of a viscoelastic mucus layer supported by a fluid film known as the periciliary liquid. The viscoelastic behavior of the mucus layer is principally due to long-chain polymers known as mucins. The airway surface liquid is cleared from the lung by ciliary transport, surface tension gradients, and airflow shear forces. This work presents a multiscale model of the effect of airflow shear forces, as exerted by tidal breathing and cough, upon clearance. The composition of the mucus layer is complex and variable in time. To avoid the restrictions imposed by adopting a viscoelastic flow model of limited validity, a multiscale computational model is introduced in which the continuum-level properties of the airway surface liquid are determined by microscopic simulation of long-chain polymers. A bridge between microscopic and continuum levels is constructed through a kinetic-level probability density function describing polymer chain configurations. The overall multiscale framework is especially suited to biological problems due to the flexibility afforded in specifying microscopic constituents, and examining the effects of various constituents upon overall mucus transport at the continuum scale.

Mitran, Sorin, E-mail: mitran@unc.edu

2013-07-01T23:59:59.000Z

469

Sources Of Chloride In Hydrothermal Fluids From The Valles Caldera, New  

Open Energy Info (EERE)

Sources Of Chloride In Hydrothermal Fluids From The Valles Caldera, New Sources Of Chloride In Hydrothermal Fluids From The Valles Caldera, New Mexico- A 36Cl Study Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Sources Of Chloride In Hydrothermal Fluids From The Valles Caldera, New Mexico- A 36Cl Study Abstract The Valles caldera in New Mexico hosts a high-temperature geothermal system, which is manifested in a number of hot springs discharging in and around the caldera. In order to determine the fluid pathways and the origin of chloride in this system, we measured 36Cl/Cl ratios in waters from high-temperature drill holes and from surface springs in this region. The waters fall into two general categories: recent meteoric water samples with low Cl- concentrations (< 10 mg/L) and relatively high 36Cl/Cl ratios

470

Fluid Inclusion Analysis At Coso Geothermal Area (Norman & Moore, 2004) |  

Open Energy Info (EERE)

Fluid Inclusion Analysis At Coso Geothermal Area (Norman & Moore, 2004) Fluid Inclusion Analysis At Coso Geothermal Area (Norman & Moore, 2004) (Redirected from Water-Gas Samples At Coso Geothermal Area (2004)) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Fluid Inclusion Analysis At Coso Geothermal Area (Norman & Moore, 2004) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Fluid Inclusion Analysis Activity Date 2004 Usefulness useful DOE-funding Unknown Exploration Basis To determine effectiveness of FIS for geothermal exploration Notes In order to test FIS for geothermal exploration, drill chips were analyzed from Coso well 83-16, which were selected at 1000 ft intervals by Joseph Moore. Sequential crushes done by our CFS (crushfast-scan) method (Norman

471

Isotopic Analysis-Fluid At Raft River Geothermal Area (1982) | Open Energy  

Open Energy Info (EERE)

Analysis-Fluid At Raft River Geothermal Area Analysis-Fluid At Raft River Geothermal Area (1982) Exploration Activity Details Location Raft River Geothermal Area Exploration Technique Isotopic Analysis- Fluid Activity Date 1982 Usefulness not useful DOE-funding Unknown Exploration Basis Determine which reservoir model best matches the isotope data. Notes 1) Chemical and light-stable isotope data are presented for water samples from the Raft River geothermal area and nearby. On the basis of chemical character, as defined by a trilinear plot of per cent milliequivalents, and light-stable isotope data, the waters in the geothermal area can be divided into waters that have and have not mixed with cold water. 2) Helium isotope ratios have been measured in geothermal fluids. These ratios have been interpreted in terms of the processes which supply He in distinct isotopic

472

Teaching Image Computation: From Computer Graphics to Computer Vision  

E-Print Network (OSTI)

Teaching Image Computation: From Computer Graphics to Computer Vision Bruce A. Draper and J. Ross Beveridge Department of Computer Science Colorado State University Fort Collins, CO 80523 draper@cs.colostate.edu ross@cs.colostate.edu Keywords: Computer Vision, Computer Graphics, Education, Course Design

Draper, Bruce A.

473

Definition: Isotopic Analysis- Fluid | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Isotopic Analysis- Fluid Jump to: navigation, search Dictionary.png Isotopic Analysis- Fluid Isotopes are atoms of the same element that have different numbers of neutrons. An isotopic analysis looks at a particular isotopic element(s) in a given system, while the conditions which increase/decrease the number of neutrons are well understood and measurable. Fluid isotopes are used to characterize a fluids origin, age, and/or interaction with rocks or other fluids based on unique isotopic ratios or concentrations.[1] View on Wikipedia Wikipedia Definition Isotope geochemistry is an aspect of geology based upon study of the relative and absolute concentrations of the elements and their isotopes in

474

Definition: Fluid Lab Analysis | Open Energy Information  

Open Energy Info (EERE)

Fluid Lab Analysis Fluid Lab Analysis Jump to: navigation, search Dictionary.png Fluid Lab Analysis Fluid lab analysis encompasses a broad array of techniques used for the analysis of water and gas samples. These analyses are used in a variety of disciplines to quantify the chemical components and properties of groundwater systems. In geothermal exploration and development, fluid analyses often provide a first look into the characteristics of a hydrothermal system, and are routinely used in ongoing monitoring of geothermal reservoirs.[1] View on Wikipedia Wikipedia Definition Water chemistry analyses are carried out to identify and quantify the chemical components and properties of a certain water. This include pH, major cations and anions, trace elements and isotopes. Water chemistry

475

Definition: Downhole Fluid Sampling | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Downhole Fluid Sampling Jump to: navigation, search Dictionary.png Downhole Fluid Sampling Downhole fluid sampling is done to characterize the chemical, thermal, or hydrological properties of a surface or subsurface aqueous system. Downhole fluid sampling is typically performed to monitor water quality, study recharge and flow in groundwater systems, and evaluate resource potential of geothermal reservoirs. Analysis of both the liquid and gas fractions of the reservoir fluid allows for detailed characterize the chemical, thermal, or hydrological properties of the subsurface hydrothermal system. View on Wikipedia Wikipedia Definition Ret Like Like You like this.Sign Up to see what your friends like.

476

Modelling anisotropic fluid spheres in general relativity  

E-Print Network (OSTI)

We argue that an arbitrary general relativistic anisotropic fluid sphere, (spherically symmetric but with transverse pressure not equal to radial pressure), can nevertheless be successfully modelled by suitable linear combinations of quite ordinary classical matter: an isotropic perfect fluid, a classical electromagnetic field, and a classical (minimally coupled) scalar field. While the most general decomposition is not unique, a preferred minimal decomposition can be constructed that is unique. We show how the classical energy conditions for the anisotropic fluid sphere can be related to energy conditions for the isotropic perfect fluid, electromagnetic field, and scalar field components of the model. Furthermore we show how this decomposition relates to the distribution of electric charge density and scalar charge density throughout the model that is used to mimic the anisotropic fluid sphere. Consequently, we can build physically reasonable matter models for almost any spherically symmetric spacetime.

Boonserm, Petarpa; Visser, Matt

2015-01-01T23:59:59.000Z

477

Euler's fluid equations: Optimal Control vs Optimization  

E-Print Network (OSTI)

An optimization method used in image-processing (metamorphosis) is found to imply Euler's equations for incompressible flow of an inviscid fluid, without requiring that the Lagrangian particle labels exactly follow the flow lines of the Eulerian velocity vector field. Thus, an optimal control problem and an optimization problem for incompressible ideal fluid flow both yield the \\emph {same} Euler fluid equations, although their Lagrangian parcel dynamics are \\emph{different}. This is a result of the \\emph{gauge freedom} in the definition of the fluid pressure for an incompressible flow, in combination with the symmetry of fluid dynamics under relabeling of their Lagrangian coordinates. Similar ideas are also illustrated for SO(N) rigid body motion.

Darryl D. Holm

2009-09-28T23:59:59.000Z

478

Pumping viscoelastic two-fluid media  

E-Print Network (OSTI)

Using a two-fluid model for viscoelastic polymer solutions, we study analytically fluid transport driven by a transverse, small amplitude traveling wave propagation. The pumping flow far from the waving boundary is shown to be strongly wave number and viscosity dependent, in contrast to a viscous Newtonian fluid. We find the two qualitatively different regimes: In one regime relevant to small wave numbers, the fluidic transport is almost the same as the Newtonian case, and uniform viscoelastic constitutive equations provide a good approximation. In the other regime, the pumping is substantially decreased because of the gel-like character. The boundary separating these two regimes is clarified. Our results suggest possible needs of two-fluid descriptions for the transport and locomotion in biological fluids with cilia and flagella.

Hirofumi Wada

2010-04-08T23:59:59.000Z

479

Fluid chemistry and temperatures prior to exploitation at the Las Tres Vrgenes geothermal field, Mexico  

Science Journals Connector (OSTI)

Generation of electricity at the Las Tres Vrgenes (LTV) geothermal field, Mexico, began in 2001. There are currently nine geothermal wells in the field, which has an installed electricity generating capacity of 10MWe. The chemical and temperature conditions prevailing in the field prior to its exploitation have been estimated, including their central tendency and dispersion parameters. These conditions were computed on the basis of: (i) geochemical data on waters from springs and domestic wells, and on geothermal well fluids (waters and gases); most of the sampling took place between 1995 and 1999; (ii) fluid inclusion studies; (iii) geothermometric data; and (iv) static formation temperatures computed using a modified quadratic regression Horner method. Fluid inclusion homogenization temperatures (in the 100290C range) suggest that there is a high-temperature fluid upflow zone near wells LV3 and LV4 in the southern part of the field. Computed average chemical equilibrium temperatures for the geothermal fluids are ?260C, based on the Na/K and SiO2 geothermometers, and ?265C, based on the H2/Ar, and CO2/Ar geothermometers. In general, the fluid inclusion homogenization temperatures are consistent with geothermometric data, as well as with static formation temperatures. Some of the observed differences could be related to well interference effects and different fluid production/sampling depths. The deeper geothermal waters show higher concentrations of Cl, Na, K, B, Ba, but lower concentrations of SO4, Ca, and Mg than the shallower waters. Fluid inclusion salinities are also higher in the deeper rocks. The measured Na/Cl ratios of the geothermal well waters are more or less uniform throughout the field and are very similar to that of seawater, strongly suggesting a seawater component in the fluid of the LTV system. The heat stored in the LTV geothermal system was estimated to be at least 9נ1012MJ, of which some 4נ1011MJ (equivalent to about 148MWe for 30 years of operation, assuming a conversion efficiency of ?35%) might be extracted using wells. These results indicate that the installed capacity at LTV could be safely increased from the current 10MWe.

Surendra P. Verma; Kailasa Pandarinath; Edgar Santoyo; Eduardo Gonzlez-Partida; Ignacio S. Torres-Alvarado; Enrique Tello-Hinojosa

2006-01-01T23:59:59.000Z

480

Computational biology and high performance computing  

E-Print Network (OSTI)

Biology and High Performance Computing Manfred Zorn, TeresaBiology and High Performance Computing Presenters: Manfred99-Portland High performance computing has become one of the

Shoichet, Brian

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "determination computational fluid" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Kinetics of Fluid Demixing in Complex Plasmas: Role of Two-Scale Interactions  

Science Journals Connector (OSTI)

Using experiments and combining theory and computer simulations, we show that binary complex plasmas are particularly good model systems to study the kinetics of fluid-fluid demixing at the atomistic (individual particle) level. The essential parameters of interparticle interactions in complex plasmas, such as the interaction range(s) and degree of nonadditivity, can be varied significantly, which allows systematic investigations of different demixing regimes. The critical role of competition between long-range and short-range interactions at the initial stage of the spinodal decomposition is discussed.

A. Wysocki, C. Rth, A. V. Ivlev, K. R. Stterlin, H. M. Thomas, S. Khrapak, S. Zhdanov, V. E. Fortov, A. M. Lipaev, V. I. Molotkov, O. F. Petrov, H. Lwen, and G. E. Morfill

2010-07-21T23:59:59.000Z

482

A computer music instrumentarium  

E-Print Network (OSTI)

Chapter 6. COMPUTERS: To Solder or Not toMusic Models : A Computer Music Instrumentarium . . . . .Interactive Computer Systems . . . . . . . . . . . . . . 101

Oliver La Rosa, Jaime Eduardo

2011-01-01T23:59:59.000Z

483

EMSL - Molecular Science Computing  

NLE Websites -- All DOE Office Websites (Extended Search)

computing Resources and Techniques Molecular Science Computing - Sophisticated and integrated computational capabilities, including scientific consultants, software, Cascade...

484

TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID-INCLUSION  

Open Energy Info (EERE)

TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID-INCLUSION TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID-INCLUSION GAS CHEMISTRY Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID-INCLUSION GAS CHEMISTRY Details Activities (1) Areas (1) Regions (0) Abstract: Vein and alteration assemblages from eight Coso wells have been collected and their fluid-inclusion gases analyzed by quadrupole mass spectrometry. Four major types of alteration were sampled: 1) young calcite-hematite-pyrite veins; 2) wairakite or epidote veins and alteration that are spatially associated with deep reservoirs in the main field and eastern wells; 3) older sericite and pyrite wallrock alteration; and 4) stilbite-calcite veins that are common in cooler or marginal portions of

485

Textured-surface quartz resonator fluid density and viscosity monitor  

DOE Patents (OSTI)

A pair of thickness-shear mode resonators, one smooth and one with a textured surface, allows fluid density and viscosity to be independently resolved. A textured surface, either randomly rough or regularly patterned, leads to trapping of liquid at the device surface. The synchronous motion of this trapped liquid with the oscillating device surface allows the device to weigh the liquid; this leads to an additional response that depends on liquid density. This additional response enables a pair of devices, one smooth and one textured, to independently resolve liquid density and viscosity; the difference in responses determines the density while the smooth device determines the density-viscosity product, and thus, the pair determines both density and viscosity.

Martin, Stephen J. (Albuquerque, NM); Wiczer, James J. (Albuquerque, NM); Cernosek, Richard W. (Albuquerque, NM); Frye, Gregory C. (Cedar Crest, NM); Gebert, Charles T. (Albuquerque, NM); Casaus, Leonard (Bernalillo, NM); Mitchell, Mary A. (Tijeras, NM)

1998-08-25T23:59:59.000Z

486

Characterizing Fractures in the Geysers Geothermal Field by Micro-seismic Data, Using Soft Computing, Fractals, and Shear Wave Anisotropy  

Energy.gov (U.S. Department of Energy (DOE))

Determine if fracturing could be used to enhance permeability; and whether dilution of existing fluids with injected water would lower corrosivity enough to allow economic production of power.

487

Studying rheological behavior of nanoclay as oil well drilling fluid  

Science Journals Connector (OSTI)

Bentonite is commonly used to control the rheology and filtrate loss required for water-based drilling fluids. In this study, the effect ... modification on fluid viscosity and its dispersion in oil-wet fluids we...

M. Mohammadi; M. Kouhi; A. Sarrafi; M. Schaffie

2013-09-01T23:59:59.000Z

488

Thermal Storage and Advanced Heat Transfer Fluids (Fact Sheet)  

SciTech Connect

Fact sheet describing NREL CSP Program capabilities in the area of thermal storage and advanced heat transfer fluids: measuring thermophysical properties, measuring fluid flow and heat transfer, and simulating flow of thermal energy and fluid.

Not Available

2010-08-01T23:59:59.000Z

489

Heat Transfer in Wedge Flow of a Micropolar Fluid  

Science Journals Connector (OSTI)

The theory of fluids with microstructures was first given by Eringen ... , 1965), and they are called micropolar fluids. These fluids exhibit microrotational effects and microrotational inertia. The flow of such

V. M. Soundalgekar; H. S. Takhar

1980-01-01T23:59:59.000Z

490

A model of overall regulation of body fluids  

Science Journals Connector (OSTI)

A large-scale model of body fluid regulation was presented for the purpose of studying problems concerning body fluid disturbances and fluid therapy. This model, containing subsystems of circulation, respirati...

Noriaki Ikeda; Fumiaki Marumo; Masuo Shirataka

1979-01-01T23:59:59.000Z

491

Arterial LDL Transport Incorporating Fluid Solid Interactions, Hyperthermia, and Atherosclerosis  

E-Print Network (OSTI)

of Mechanical Engineers, Fluids Engineering Division (FED, Bio-Medical Fluids Engineering 21, 8. Buckwalter, J.Fluid Solid Interactions, Hyperthermia, and Atherosclerosis by Stephen Chung Doctor of Philosophy, Graduate Program in Mechanical Engineering

Chung, Stephen

2013-01-01T23:59:59.000Z

492

Quantum MonteCarlo Simulation of the High-Pressure Molecular-Atomic Crossover in Fluid Hydrogen  

Science Journals Connector (OSTI)

A first-order liquid-liquid phase transition in high-pressure hydrogen between molecular and atomic fluid phases has been predicted in computer simulations using abinitio molecular dynamics approaches. However, experiments indicate that molecular dissociation may occur through a continuous crossover rather than a first-order transition. Here we study the nature of molecular dissociation in fluid hydrogen using an alternative simulation technique in which electronic correlation is computed within quantum MonteCarlo methods, the so-called coupled electron-ion MonteCarlo method. We find no evidence for a first-order liquid-liquid phase transition.

Kris T. Delaney; Carlo Pierleoni; D. M. Ceperley

2006-12-06T23:59:59.000Z

493

Categorical Exclusion Determinations: National Energy Technology Laboratory  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

16, 2010 16, 2010 CX-004689: Categorical Exclusion Determination Single-Molecule Imaging System Combined with Nano-Fluidic Chip to Understand Fluid Flow in Shale Gas CX(s) Applied: B3.6 Date: 12/16/2010 Location(s): Golden, Colorado Office(s): Fossil Energy, National Energy Technology Laboratory December 16, 2010 CX-004688: Categorical Exclusion Determination Single-Molecule Imaging System Combined with Nano-Fluidic Chip to Understand Fluid Flow in Shale Gas CX(s) Applied: B3.6 Date: 12/16/2010 Location(s): Rolla, Missouri Office(s): Fossil Energy, National Energy Technology Laboratory December 16, 2010 CX-004755: Categorical Exclusion Determination State Energy Program: Program Support/Administration CX(s) Applied: A1, A9, A11, B5.1 Date: 12/16/2010 Location(s): Maine Office(s): Energy Efficiency and Renewable Energy, National Energy

494

Categorical Exclusion Determinations: Texas | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

January 29, 2013 January 29, 2013 CX-009851: Categorical Exclusion Determination Development of Methods to Prohibit and Remediate Loss of Annular Isolation in Shale Gas Wells CX(s) Applied: A9, A11, B3.6 Date: 01/29/2013 Location(s): Texas Offices(s): National Energy Technology Laboratory January 22, 2013 CX-009854: Categorical Exclusion Determination Induced Seismicity/Fluid Injection: Development of Strategies to Manage Fluid Disposal in Shale Plays CX(s) Applied: A9, A11 Date: 01/22/2013 Location(s): Texas Offices(s): National Energy Technology Laboratory January 14, 2013 CX-009857: Categorical Exclusion Determination Seismic Stimulation for Enhanced Oil Recovery CX(s) Applied: A9, A11, B3.6, B3.7 Date: 01/14/2013 Location(s): Texas Offices(s): National Energy Technology Laboratory

495

Computer Graphics Proceedings, Annual Conference Series, 2003 Animating Suspended Particle Explosions  

E-Print Network (OSTI)

Computer Graphics Proceedings, Annual Conference Series, 2003 Animating Suspended Particle products. Par- ticles immersed in the fluid track the motion of particulate fuel and soot.8 [Simulation and Modeling]: Types of Simulation--Animation 1 Introduction Although explosions are thankfully

O'Brien, James F.

496

A Computational Study on the Leakage of Supercritical Carbon Dioxide through Labyrinth Seals  

E-Print Network (OSTI)

of turbomachinery equipment it is important to reduce internal leakage through seals. A computational study was performed to understand the leakage through seals subject to large pressure differential using Open source CFD software OpenFOAM. FIT (Fluid Property...

Pidaparti, Sandeep R

2013-11-26T23:59:59.000Z

497

Packing frustration in dense confined fluids  

E-Print Network (OSTI)

Packing frustration for confined fluids, i.e., the incompatibility between the preferred packing of the fluid particles and the packing constraints imposed by the confining surfaces, is studied for a dense hard-sphere fluid confined between planar hard surfaces at short separations. The detailed mechanism for the frustration is investigated via an analysis of the anisotropic pair distributions of the confined fluid, as obtained from integral equation theory for inhomogeneous fluids at pair correlation level within the anisotropic Percus-Yevick approximation. By examining the mean forces that arise from interparticle collisions around the periphery of each particle in the slit, we calculate the principal components of the mean force for the density profile - each component being the sum of collisional forces on a particle's hemisphere facing either surface. The variations of these components with the slit width give rise to rather intricate changes in the layer structure between the surfaces, but, as shown in this paper, the basis of these variations can be easily understood qualitatively and often also semi-quantitatively. It is found that the ordering of the fluid is in essence governed locally by the packing constraints at each single solid-fluid interface. A simple superposition of forces due to the presence of each surface gives surprisingly good estimates of the density profiles, but there remain nontrivial confinement effects that cannot be explained by superposition, most notably the magnitude of the excess adsorption of particles in the slit relative to bulk.

Kim Nygrd; Sten Sarman; Roland Kjellander

2014-09-04T23:59:59.000Z

498

NREL: Computational Science - Donald Nelson  

NLE Websites -- All DOE Office Websites (Extended Search)

Donald Nelson Donald Nelson Contractor Phone: (303) 275-4157 Email: Donald.Nelson@nrel.gov Donald Nelson is a visualization rendering engineer contractor working with the Computational Science Center. His research has focused primarily on algorithms for interaction with dynamical systems including fluid flow, partial differential equations, finite element mechanics for biological tissues and medical devices, and optimization of minimal strain energy in mechanical and biological systems. Upon completion of his Ph.D., he worked for 6 years at Immersion Medical in scientific visualization, computer aided design, and interactive mechanical systems. He joined Electronic Arts to work on interactive, parallel rendering algorithms in 2006. In 2009 he joined SAIC to work on statistical

499

Evaluation of Biodiesel Fuels from Supercritical Fluid Processing...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Biodiesel Fuels from Supercritical Fluid Processing with the Advanced Distillation Curve Method Evaluation of Biodiesel Fuels from Supercritical Fluid Processing with the Advanced...

500

Application of Neutron Imaging and Scattering to Fluid Flow and...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Application of Neutron Imaging and Scattering to Fluid Flow and Fracture in EGS Environments Application of Neutron Imaging and Scattering to Fluid Flow and Fracture in EGS...