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1

Applied large eddy simulation  

Science Journals Connector (OSTI)

...2971-2983. doi:10.1098/rsta.2008.0303 . Audio Supplement Audio Supplement Audio files from the Applied large eddy simulation...fidelity. | Whittle Laboratory, Department of Engineering, University of Cambridge, Cambridge CB2 1PZ...

2009-01-01T23:59:59.000Z

2

Large-eddy simulations of scramjet engines.  

E-Print Network (OSTI)

??The main objective of this dissertation is to develop large-eddy simulation (LES) based computational tools for supersonic inlet and combustor design. In the recent past,… (more)

Koo, Heeseok

2011-01-01T23:59:59.000Z

3

Implicit Large Eddy Simulation  

National Nuclear Security Administration (NNSA)

Implicit Implicit Large Eddy Simulation (ILES) for High Reynolds Number Flows Len Margolin Applied Physics Division Los Alamos National Laboratory Collaborators: 1. Bill Rider (LANL) 2. Piotr Smolarkiewicz (NCAR) 3. Andrzej Wysogrodski (NCAR) 4. Fernando Grinstein (NRL) len@lanl.gov 1 Implicit Large Eddy Simulation Outline: * What is ILES? * What are its advantages? * Historical perspective * Why does it work? * Some examples len@lanl.gov 2 What is ILES ILES is the direct application of a fluid solver to a high Reynolds number fluid flow with no explicit turbulence model. · The truncation terms of the algorithm serve as an effective model of the effects of the unresolved scales. · Fluid solvers based on Nonoscillatory Finite Volume (NFV) approximations work effectively for ILES. · Fluid solvers based on pseudospectral methods, leapfrog methods, advective form methods, etc. do not work

4

Gyrokinetic large eddy simulations  

SciTech Connect

The large eddy simulation approach is adapted to the study of plasma microturbulence in a fully three-dimensional gyrokinetic system. Ion temperature gradient driven turbulence is studied with the GENE code for both a standard resolution and a reduced resolution with a model for the sub-grid scale turbulence. A simple dissipative model for representing the effect of the sub-grid scales on the resolved scales is proposed and tested. Once calibrated, the model appears to be able to reproduce most of the features of the free energy spectra for various values of the ion temperature gradient.

Morel, P.; Navarro, A. Banon; Albrecht-Marc, M.; Carati, D. [Statistical and Plasma Physics Laboratory, Universite Libre de Bruxelles, Bruxelles 1050 (Belgium); Merz, F.; Goerler, T.; Jenko, F. [Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, D-85748 Garching (Germany)

2011-07-15T23:59:59.000Z

5

Vehicle Technologies Office Merit Review 2014: Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research  

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

Presentation given by Sandia National Laboratories at 2014 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Office Annual Merit Review and Peer Evaluation Meeting about large eddy...

6

Large Eddy Simulation of Trade Wind Cumulus Clouds  

Science Journals Connector (OSTI)

A large eddy simulation (LES) model, used for studying the dry convective boundary layer, has been extended with an equation for the total water specific humidity and a condensation scheme to simulate the partly cloudy convective boundary layer. ...

J. W. M. Cuijpers; P. G. Duynkerke

1993-12-01T23:59:59.000Z

7

Large-Eddy Simulation of Swirling Pulverized-Coal Combustion  

Science Journals Connector (OSTI)

A Eulerian-Lagrangian large-eddy simulation (LES) with a Smagorinsky-Lilly sub-grid scale stress model, presumed-PDF fast chemistry and EBU gas combustion models, particle devolatilization and particle combustion

L. Y. Hu; L. X. Zhou; Y. H. Luo; C. S. Xu

2013-01-01T23:59:59.000Z

8

Using large eddy simulations to understand flow mixing | Argonne National  

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

large eddy simulations to understand flow mixing large eddy simulations to understand flow mixing March 4, 2013 Tweet EmailPrint In nuclear power plants, turbulent flow streams of different velocity and density mix rapidly at right angles in pipes. If those mixing flow streams are of different temperatures, thermal fluctuations result on the pipe wall. Such fluctuations can damage a pipe's structure and, ultimately, cause its failure. To better understand this phenomenon and to predict the effects, scientists have developed modeling methods known as large eddy simulations (LES). LES models only the energy-carrying large scales of motion, using a filtering mechanism to account for subgrid-scale motion. Thanks to recent advances in high-performance computing, the technique has become increasingly popular for simulating unsteady flows, allowing high fidelity

9

Large eddy simulation applications in gas turbines  

Science Journals Connector (OSTI)

...challenges. In SciDAC 2008 Conference, Seattle, USA. Jones, W.P. 2002Large eddy simulation of turbulent combustion processes. Comput. Phys. Commun. 147, 533-537. doi:10.1016/S0010-4655(02)00330-2 . Jones, W.P...

2009-01-01T23:59:59.000Z

10

Large Eddy Simulation of Wind Turbulence for Appropriate Urban Environment  

Science Journals Connector (OSTI)

This study shows the numerical model which has the actual shape of the urban surface in order to analyze the wind turbulence in a city by large eddy simulation (LES) technique. Predictive accuracy of LES ... haza...

Tetsuro Tamura

2010-01-01T23:59:59.000Z

11

Large eddy simulation of one diffusion swirling flame European Combustion Meeting 2011  

E-Print Network (OSTI)

.5 7200 75900 Numerical method This research use large eddy simulation (LES) in software ANASYS FLUENT Simulations of Swirling Non-premixed Flames With Flamelet Models: A Comparison of Numerical Methods. FlowLarge eddy simulation of one diffusion swirling flame European Combustion Meeting 2011 Introduction

Berning, Torsten

12

Applications of large eddy simulation methods to gyrokinetic turbulence  

SciTech Connect

The large eddy simulation (LES) approach—solving numerically the large scales of a turbulent system and accounting for the small-scale influence through a model—is applied to nonlinear gyrokinetic systems that are driven by a number of different microinstabilities. Comparisons between modeled, lower resolution, and higher resolution simulations are performed for an experimental measurable quantity, the electron density fluctuation spectrum. Moreover, the validation and applicability of LES is demonstrated through a series of diagnostics based on the free energetics of the system.

Bañón Navarro, A., E-mail: alejandro.banon.navarro@ipp.mpg.de; Happel, T. [Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching (Germany)] [Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching (Germany); Teaca, B. [Applied Mathematics Research Centre, Coventry University, Coventry CV1 5FB (United Kingdom) [Applied Mathematics Research Centre, Coventry University, Coventry CV1 5FB (United Kingdom); Max-Planck für Sonnensystemforschung, Max-Planck-Str. 2, D-37191 Katlenburg-Lindau (Germany); Max-Planck/Princeton Center for Plasma Physics (Germany); Jenko, F. [Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching (Germany) [Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching (Germany); Max-Planck/Princeton Center for Plasma Physics (Germany); Hammett, G. W. [Max-Planck/Princeton Center for Plasma Physics, Princeton Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, New Jersey 08543 (United States)] [Max-Planck/Princeton Center for Plasma Physics, Princeton Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, New Jersey 08543 (United States); Collaboration: ASDEX Upgrade Team

2014-03-15T23:59:59.000Z

13

Toward the Large-Eddy Simulation Over a Hypersonic Elliptical Cross-Section Cone  

E-Print Network (OSTI)

Toward the Large-Eddy Simulation Over a Hypersonic Elliptical Cross-Section Cone M. Pino Mart layer. Also, the computational setup for the large-eddy sim- ulation (LES) of a hypersonic elliptical cross-section cone is discussed in detail. Introduction The aerodynamic heating effects in hypersonic

Martín, Pino

14

Large Eddy Simulation of the Wind Field and Pollution Dispersion in Building Array  

Science Journals Connector (OSTI)

The air quality is one of the significant issues in sustainable development of modern city. In the paperthe Large Eddy Simulation (LES) is used to predict the wind field and pollution dispersion in residence dist...

R. F. Shi; G. X. Cui; C. X. Xu; Z. S. Zhang…

2009-01-01T23:59:59.000Z

15

Large-Eddy Simulation of Flow and Pollutant Transport in Urban Street Canyons with Ground Heating  

E-Print Network (OSTI)

Our study employed large-eddy simulation (LES) based on a one-equation subgrid-scale model to investigate the flow field and pollutant dispersion characteristics inside urban street canyons. Unstable thermal stratification ...

Li, Xian-Xiang

16

Large-Eddy Simulation of Post-Cold-Frontal Continental Stratocumulus  

E-Print Network (OSTI)

Previous large-eddy simulations (LES) of stratocumulus-topped boundary layers have been exclusively set in marine environments. Boundary layer stratocumulus clouds are also prevalent over the continent but have not been ...

Mechem, David B.; Kogan, Yefim L.; Schultz, David M.

2010-12-01T23:59:59.000Z

17

Large-Eddy Simulation of Marine Atmospheric Boundary Layers above a Spectrum of Moving Waves  

Science Journals Connector (OSTI)

Momentum and scalar transport in the marine atmospheric boundary layer (MABL) is driven by a turbulent mix of winds, buoyancy, and surface gravity waves. To investigate the interaction between these processes, a large-eddy simulation (LES) model ...

Peter P. Sullivan; James C. McWilliams; Edward G. Patton

2014-11-01T23:59:59.000Z

18

Large Eddy Simulation of PBL Stratocumulus: Comparison of Multi...  

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

Large-Eddy Simulation of PBL Stratocumulus: Comparison of Multi-Dimensional and IPA Longwave Radiative Forcing D. B. Mechem and Y. L. Kogan Cooperative Institute for Mesoscale...

19

Large-Eddy Simulation for Green Energy and Propulsion Systems...  

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

Large-Eddy Simulation for Green Energy and Propulsion Systems PI Name: Umesh Paliath PI Email: paliath@ge.com Institution: General Electric Allocation Program: INCITE Allocation...

20

Resolved Turbulence Characteristics in Large-Eddy Simulations Nested within Mesoscale Simulations Using the Weather Research and Forecasting Model  

Science Journals Connector (OSTI)

One-way concurrent nesting within the Weather Research and Forecasting Model (WRF) is examined for conducting large-eddy simulations (LES) nested within mesoscale simulations. Wind speed, spectra, and resolved turbulent stresses and turbulence ...

Jeff Mirocha; Branko Kosovi?; Gokhan Kirkil

2014-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "large-eddy simulation les" 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

Large Eddy Simulation of wind farm aerodynamics: A review  

Science Journals Connector (OSTI)

Abstract To study wind farm aerodynamics (WFA), the Wind Power industry currently relies on simple Engineering Models (EM) that simulate wind farms using basic principles of physics and empirically established approximations. \\{EMs\\} are fast and accurate for an overview of WFA and gauging mean power production, but cannot resolve phenomena like wake meandering, effect of atmospheric stratification on wake development, a turbine?s response to partial wake interaction and yawed inflows etc., and their relation with turbine loading, which require a first principle physics-based model, namely Computational Fluid Dynamics (CFD). Although advances in computer technology have promoted the application of CFD, the study of WFA is yet unworkable with Direct Numerical Simulation, which is the most comprehensive CFD technique. Thus, as a trade-off between cost and detail, researchers must resort to Large Eddy Simulation (LES) to garner thorough knowledge of WFA, which could in succession help the industry improve engineering models. This paper summarises the contributions of various LES investigations into WFA and how they have helped broaden our understanding of the subject. Additionally, the article touches upon the optimal use of LES and of the resultant data, and also the challenges faced by LES.

D. Mehta; A.H. van Zuijlen; B. Koren; J.G. Holierhoek; H. Bijl

2014-01-01T23:59:59.000Z

22

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

23

Large-Eddy Simulation of a Supersonic Inlet-Isolator Heeseok Koo1  

E-Print Network (OSTI)

-mode scramjet engine that pro- vides stable compressed flow to the combustor. However, if the combustor scramjet engines. Here, the predictive capa- bility of the large eddy simulation (LES) methodology-mode scramjets provide a practical solution to hypersonic flight by operating at both low and high supersonic

Raman, Venkat

24

Nesting large-eddy simulations within mesoscale simulations for wind energy applications  

SciTech Connect

With increasing demand for more accurate atmospheric simulations for wind turbine micrositing, for operational wind power forecasting, and for more reliable turbine design, simulations of atmospheric flow with resolution of tens of meters or higher are required. These time-dependent large-eddy simulations (LES), which resolve individual atmospheric eddies on length scales smaller than turbine blades and account for complex terrain, are possible with a range of commercial and open-source software, including the Weather Research and Forecasting (WRF) model. In addition to 'local' sources of turbulence within an LES domain, changing weather conditions outside the domain can also affect flow, suggesting that a mesoscale model provide boundary conditions to the large-eddy simulations. Nesting a large-eddy simulation within a mesoscale model requires nuanced representations of turbulence. Our group has improved the Weather and Research Forecasting model's (WRF) LES capability by implementing the Nonlinear Backscatter and Anisotropy (NBA) subfilter stress model following Kosovic (1997) and an explicit filtering and reconstruction technique to compute the Resolvable Subfilter-Scale (RSFS) stresses (following Chow et al, 2005). We have also implemented an immersed boundary method (IBM) in WRF to accommodate complex terrain. These new models improve WRF's LES capabilities over complex terrain and in stable atmospheric conditions. We demonstrate approaches to nesting LES within a mesoscale simulation for farms of wind turbines in hilly regions. Results are sensitive to the nesting method, indicating that care must be taken to provide appropriate boundary conditions, and to allow adequate spin-up of turbulence in the LES domain.

Lundquist, J K; Mirocha, J D; Chow, F K; Kosovic, B; Lundquist, K A

2008-09-08T23:59:59.000Z

25

Large-eddy simulation/probability density function modeling of a non-premixed CO/H2  

E-Print Network (OSTI)

;applicable to practical devices such as gas turbine combustors and internal combustion engines [2­ 4]. In LES September 2012 Abstract We report a large-eddy simulation (LES)/probability density function (PDF) study/PDF modeling approach, recent progress of LES of tur- bulent combustion is reviewed in [10]. In the modeling

26

Massively Parallel Spectral Element Large Eddy Simulation of a Turbulent Channel Using Wall Models  

E-Print Network (OSTI)

the strength and ability to push forward and succeed. I owe you guys everything and nobody could ask for a better family. I love you all. iv NOMENCLATURE CFD Computational Fluid Dynamics DNS Direct Numerical Simulation RANS Reynolds Averaged Navier...-Stokes LES Large Eddy Simulation FEM Finite Element Method SEM Spectral Element Method SGS Sub-Grid Scale TLM Two Layer Method Re Reynolds Number Re Friction Reynolds Number U1 Characteristic Velocity GLL Gauss-Lobatto-Legendre Cs Smagorinski Coe...

Rabau, Joshua I

2013-05-01T23:59:59.000Z

27

Large-Eddy Simulation of the Bachalo-Johnson Flow, with Shock...  

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

Travin, New Technologies and Services, Ltd. Large-Eddy Simulation of the Bachalo-Johnson Flow, with Shock-Induced Separation PI Name: Philippe Spalart PI Email:...

28

Large-Eddy Simulation of a Residual Layer: Low-Level Jet, Convective Rolls, and Kelvin–Helmholtz Instability  

Science Journals Connector (OSTI)

Diurnal variations of an atmospheric boundary layer from 0900 LST on day 33 to 0600 LST on day 34 of the Wangara experiment are studied using a large-eddy simulation (LES) model that includes longwave radiation and baroclinicity. The present study ...

Mikio Nakanishi; Ryosuke Shibuya; Junshi Ito; Hiroshi Niino

2014-12-01T23:59:59.000Z

29

Modeling dilute sediment suspension using large-eddy simulation with a dynamic mixed model  

E-Print Network (OSTI)

Modeling dilute sediment suspension using large-eddy simulation with a dynamic mixed model Yi Transport of suspended sediment in high Reynolds number channel flows Re=O 600 000 is simulated using large-eddy simulation along with a dynamic-mixed model DMM . Because the modeled sediment concentration is low

Fringer, Oliver B.

30

Large-eddy simulation of a wind turbine wake in turbulent  

E-Print Network (OSTI)

Large-eddy simulation of a wind turbine wake in turbulent neutral shear flow Shengbai Xie, Cristina-similar velocity profile existing in the wake after a wind turbine? How does the wake influence the vertical? Motivation #12; Large-eddy simulation for turbulent flow field Actuator-line model for wind turbine ui

Firestone, Jeremy

31

Large-eddy simulation of offshore wind farm  

Science Journals Connector (OSTI)

A hybrid numerical capability is developed for the simulation of offshore wind farms in which large-eddy simulation is performed for the wind turbulence and a potential flow based method is used for the simulation of the ocean wave field. The wind and wave simulations are dynamically coupled. The effect of wind turbines on the wind field is represented by an actuator disk model. This study focuses on the effect of wind-seas and the turbine motion is treated as negligibly small. A variety of fully-developed and fetch-limited wind-sea conditions and turbine spacings are considered in the study. Statistical analyses are performed for the simulation results with a focus on the mean wind profile kinetic energy budget in the wind field and the wind turbine power extraction rate. The results indicate that the waves have appreciable effect on the wind farm performance. The wind turbines obtain a higher wind power extraction rate under the fully developed wind-sea condition compared with that under the fetch-limited condition. This higher extraction rate is caused by the faster propagating waves and the lower sea-surface resistance on the wind when the wind-seas are fully developed. The wave-induced difference can be as high as 8% with the commonly used turbine spacing in commercial land-based wind farms s x = 7 (with s x being the ratio of streamwise turbine spacing to the turbine diameter). Such level of difference is noteworthy considering the previous understanding that direct wave-induced disturbance to the wind field decays exponentially away from wave surface.

2014-01-01T23:59:59.000Z

32

Computational modelling of transport phenomena in high energy materials processing application: large eddy simulation and parallelisation  

Science Journals Connector (OSTI)

A comprehensive three-dimensional numerical model is presented in order to address the coupled turbulent momentum, heat and species transport during molten metal-pool convection in association with continuous evolution of solid-liquid interface typically encountered in high energy materials processing applications. The turbulent aspect is handled by a large eddy simulation (LES) model and the phase changing phenomena is taken care of by a modified enthalpy-porosity technique. The proposed finite volume based LES model is subsequently parallelised for effective computational economy. To demonstrate the effectiveness of the present model, a systematic analysis is subsequently carried out to simulate a typical high power laser surface alloying process, where the effects of turbulent transport can actually be realised.

Dipankar Chatterjee

2011-01-01T23:59:59.000Z

33

Temporal structure of aggregate power fluctuations in large-eddy simulations of extended wind-farms  

E-Print Network (OSTI)

Fluctuations represent a major challenge for the incorporation of electric power from large wind-farms into power grids. Wind farm power output fluctuates strongly in time, over various time scales. Understanding these fluctuations, especially their spatio-temporal characteristics, is particularly important for the design of backup power systems that must be readily available in conjunction with wind-farms. In this work we analyze the power fluctuations associated with the wind-input variability at scales between minutes to several hours, using large eddy simulations (LES) of extended wind-parks, interacting with the atmospheric boundary layer. LES studies enable careful control of parameters and availability of wind-velocities simultaneously across the entire wind-farm. The present study focuses on neutral atmospheric conditions and flat terrain, using actuator-disk representations of the individual wind-turbines. We consider power from various aggregates of wind-turbines such as the total average power sign...

Stevens, Richard J A M

2014-01-01T23:59:59.000Z

34

Large-eddy simulation of flows over two-dimensional idealised street canyons with height variation  

Science Journals Connector (OSTI)

A series of large-eddy simulation (LES) models consisting of two-dimensional (2D) idealised street canyons with building height variability (BHV) are examined. Building blocks with two different heights are placed alternately in the computational domains, constructing repeated street canyons of building-height-to-street-width (aspect) ratio (AR) = 1, 0.5, 0.25 and 0.125 together with BHV = 0.2, 0.4 and 0.6. LES results show that the air exchange rate (ACH) increases with increasing aerodynamic resistance. Apart from AR, BHV is another factor affecting the aerodynamic resistance and thus the ACH. The (vertical) dispersion coefficient ?z of plume transport is also closely related to the aerodynamic resistance, suggesting that introducing BHV in urban areas could help improve the air quality.

Colman C.C. Wong; Chun-Ho Liu

2014-01-01T23:59:59.000Z

35

Using Large Eddy Simulations to Understand Combustion Instabilities in Gas Turbines  

Science Journals Connector (OSTI)

This paper presents a study of the stability of a swirled premixed combustion chamber both with and without reaction using Large Eddy Simulation and a numerical solver able to handle complex geometries. It is ...

Thierry Poinsot; Jörg Schlüter…

2002-01-01T23:59:59.000Z

36

Turbulence prediction in two- and three-dimensional bundle flows using Large Eddy Simulation  

E-Print Network (OSTI)

TURBULENCE PREDICTION IN TWO- AND THREE-DIMENSIONAL BUNDLE FLOWS USING LARGE EDDY SIMULATION A Thesis by WAEL ABDUL-HAMID IBRAHIM Submitted to Texas A&M University in partial fulfillment of the requirements for the degree of MASTER... Prediction in Two- and Three-Dimensional Bundle Flows Using Large Eddy Simulation. (May 1994) Wael Abdul-Hamid Ibrahim, B. S. Alexandria University Chair of Advisory Committee: Dr. Yassin A. Hassan Flow turbulence is a familiar phenomenon in everyday life...

Ibrahim, Wael Abdul-Hamid

1994-01-01T23:59:59.000Z

37

Large eddy simulation of forced ignition of an annular bluff-body burner  

SciTech Connect

The optimization of the ignition process is a crucial issue in the design of many combustion systems. Large eddy simulation (LES) of a conical shaped bluff-body turbulent nonpremixed burner has been performed to study the impact of spark location on ignition success. This burner was experimentally investigated by Ahmed et al. [Combust. Flame 151 (2007) 366-385]. The present work focuses on the case without swirl, for which detailed measurements are available. First, cold-flow measurements of velocities and mixture fractions are compared with their LES counterparts, to assess the prediction capabilities of simulations in terms of flow and turbulent mixing. Time histories of velocities and mixture fractions are recorded at selected spots, to probe the resolved probability density function (pdf) of flow variables, in an attempt to reproduce, from the knowledge of LES-resolved instantaneous flow conditions, the experimentally observed reasons for success or failure of spark ignition. A flammability map is also constructed from the resolved mixture fraction pdf and compared with its experimental counterpart. LES of forced ignition is then performed using flamelet fully detailed tabulated chemistry combined with presumed pdfs. Various scenarios of flame kernel development are analyzed and correlated with typical flow conditions observed in this burner. The correlations between, velocities and mixture fraction values at the sparking time and the success or failure of ignition, are then further discussed and analyzed. (author)

Subramanian, V.; Domingo, P.; Vervisch, L. [CORIA-CNRS and INSA de Rouen, Technopole du Madrillet, BP 8, 76801 Saint-Etienne-du-Rouvray (France)

2010-03-15T23:59:59.000Z

38

LARGE EDDY SIMULATION AND REYNOLDS-AVERAGED NAVIER-STOKES APPROACHES OF RIB ROUGHENED CHANNEL  

E-Print Network (OSTI)

In this paper, rib roughened channel are investigated numerically by large eddy simulation (LES) and Reynolds-averaged Navier-Stokes (RANS) approaches. Results are compared with each other in streamlines and velocity components. During the present analysis, working domain is considered as three-dimensional (3-D) and the flow is assumed fully turbulent. Domain geometry and grids are generated by using a pre-processor of GAMBIT and then solved iteratively by a commercially available CFD code of FLUENT 6.2.16. Main purpose of this study is to show the capability of the CFD solver and the effect of the rib on the flow by comparing two different solution techniques.

unknown authors

39

Development and assessment of a coupled strategy for conjugate heat transfer with Large Eddy Simulation.  

E-Print Network (OSTI)

Development and assessment of a coupled strategy for conjugate heat transfer with Large Eddy is an important phenomenon in combustion chambers and a main design constraint in gas turbines. After combustion is to develop 3 hal-00803384,version1-22Mar2013 #12;and assess a suitable strategy based on LES to efficiently

Paris-Sud XI, Université de

40

Examination of steam generator turbulence by large eddy simulation  

E-Print Network (OSTI)

coefficients were calculated and compared to experimental findings from Argonne National Laboratory. The calculation predicts several features that were exhibited in the experiment. The results, as compared to experiment, show that LES is capable...

Bagwell, Ted Glyn

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "large-eddy simulation les" 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

Effect of fluctuating wind direction on cross natural ventilation in buildings from large eddy simulation  

E-Print Network (OSTI)

wind direction, and the simulated results agree reasonably with the corresponding experimental data is the use of small-scale models in a wind tunnel to simulate natural ventilation. In general, the mean flow1 Effect of fluctuating wind direction on cross natural ventilation in buildings from large eddy

Chen, Qingyan "Yan"

42

On the self-similarity assumption in dynamic models for large eddy simulations  

E-Print Network (OSTI)

that the present formulation of the DP is usually incompatible with its under- lying self-similarity assumption SSAOn the self-similarity assumption in dynamic models for large eddy simulations Daniele Carati eddy simulations and their underlying self-similarity assumption is discussed. The interpretation

Van Den Eijnden, Eric

43

Large eddy simulation for aerodynamics: status and perspectives  

Science Journals Connector (OSTI)

...RANS-LES is the main strategy to drastically reduce...appear paradoxal since the development of advanced methods is...2.85 2.85-10 1 gas turbine Medic et al. (2008...computation of an entire gas turbine jet engine. In 45th...

2009-01-01T23:59:59.000Z

44

Linear eddy mixing based tabulation and artificial neural networks for large eddy simulations of turbulent flames  

SciTech Connect

A large eddy simulation (LES) sub-grid model is developed based on the artificial neural network (ANN) approach to calculate the species instantaneous reaction rates for multi-step, multi-species chemical kinetics mechanisms. The proposed methodology depends on training the ANNs off-line on a thermo-chemical database representative of the actual composition and turbulence (but not the actual geometrical problem) of interest, and later using them to replace the stiff ODE solver (direct integration (DI)) to calculate the reaction rates in the sub-grid. The thermo-chemical database is tabulated with respect to the thermodynamic state vector without any reduction in the number of state variables. The thermo-chemistry is evolved by stand-alone linear eddy mixing (LEM) model simulations under both premixed and non-premixed conditions, where the unsteady interaction of turbulence with chemical kinetics is included as a part of the training database. The proposed methodology is tested in LES and in stand-alone LEM studies of three distinct test cases with different reduced mechanisms and conditions. LES of premixed flame-turbulence-vortex interaction provides direct comparison of the proposed ANN method against DI and ANNs trained on thermo-chemical database created using another type of tabulation method. It is shown that the ANN trained on the LEM database can capture the correct flame physics with accuracy comparable to DI, which cannot be achieved by ANN trained on a laminar premix flame database. A priori evaluation of the ANN generality within and outside its training domain is carried out using stand-alone LEM simulations as well. Results in general are satisfactory, and it is shown that the ANN provides considerable amount of memory saving and speed-up with reasonable and reliable accuracy. The speed-up is strongly affected by the stiffness of the reduced mechanism used for the computations, whereas the memory saving is considerable regardless. (author)

Sen, Baris Ali; Menon, Suresh [School of Aerospace Engineering, Georgia Institute of Technology, 270 Ferst Drive, Atlanta, GA 30332-0150 (United States)

2010-01-15T23:59:59.000Z

45

The Dispersion of Silver Iodide Particles from Ground-Based Generators over Complex Terrain. Part II: WRF Large-Eddy Simulations versus Observations  

Science Journals Connector (OSTI)

A numerical modeling study has been conducted to explore the ability of the Weather Research and Forecasting (WRF) model-based large-eddy simulation (LES) with 100-m grid spacing to reproduce silver iodide (AgI) particle dispersion by comparing ...

Lulin Xue; Xia Chu; Roy Rasmussen; Daniel Breed; Bruce Boe; Bart Geerts

2014-06-01T23:59:59.000Z

46

Extracting the Acoustic pressure field from Large Eddy Simulation of confined reactive flows  

E-Print Network (OSTI)

and non-premixed open flames3,4 as well as in more complex cases such as gas turbine combustors must be large enough to include the sources of noise as well as part of the acoustic near field.6 VeryExtracting the Acoustic pressure field from Large Eddy Simulation of confined reactive flows Camilo

Nicoud, Franck

47

Large Eddy Simulation of spark ignition in a turbulent methane jet  

E-Print Network (OSTI)

and propagation and (4) stabilization. In the context of laser and electrical spark ignition (which is the scope applications of laser ignition and comparison with standard spark plug devices. Phuoc et al. [5] presentLarge Eddy Simulation of spark ignition in a turbulent methane jet G. Lacaze a , E. Richardson b

Paris-Sud XI, Université de

48

Persistent Contrails and Contrail Cirrus. Part I: Large-Eddy Simulations from Inception to Demise  

Science Journals Connector (OSTI)

Large-eddy simulations with size-resolved microphysics are used to model persistent aircraft contrails and contrail-induced cirrus from a few wing spans behind the aircraft until their demise after many hours. Schemes for dynamic local ice binning ...

D. C. Lewellen; O. Meza; W. W. Huebsch

2014-12-01T23:59:59.000Z

49

On integrating large eddy simulation and laboratory turbulent flow experiments  

Science Journals Connector (OSTI)

...effective simulation strategy mostly by necessity...its analysis and development, further understanding...directed research and development program at Los...multi-swirl gas turbine combustor. Proc...simulation of a gas turbine combustor flow...

2009-01-01T23:59:59.000Z

50

3D chaotic model for sub-grid turbulent dispersion in Large Eddy Simulations  

E-Print Network (OSTI)

We introduce a 3D multiscale kinematic velocity field as a model to simulate Lagrangian turbulent dispersion. The incompressible velocity field is a nonlinear deterministic function, periodic in space and time, that generates chaotic mixing of Lagrangian trajectories. Relative dispersion properties, e.g. the Richardson's law, are correctly reproduced under two basic conditions: 1) the velocity amplitudes of the spatial modes must be related to the corresponding wavelengths through the Kolmogorov scaling; 2) the problem of the lack of "sweeping effect" of the small eddies by the large eddies, common to kinematic simulations, has to be taken into account. We show that, as far as Lagrangian dispersion is concerned, our model can be successfully applied as additional sub-grid contribution for Large Eddy Simulations of the planetary boundary layer flow.

Guglielmo Lacorata; Andrea Mazzino; Umberto Rizza

2007-11-15T23:59:59.000Z

51

Multi-Dimensional Broadband IR Radiative Forcing of Marine Stratocumulus in a Large Eddy Simulation Model  

SciTech Connect

In order to address the interactive and evolutionary nature of the cloud-radiation interaction, we have coupled to a Large Eddy Simulation (LES) model the sophisticated multi-dimensional radiative transfer (MDRT) scheme of Evans (Spherical Harmonics Discrete Ordinate Method; 1998). Because of computational expense, we are at this time only able to run 2D experiments. Preliminary runs consider only the broadband longwave component, in large part because IR cloud top cooling is the significant forcing mechanism for marine stratocumulus. Little difference is noted in the evolution of unbroken stratocumulus between three-hour runs using MDRT and independent pixel approximation (IPA) for 2D domains of 50 km in the horizontal and 1.5 km in the vertical. Local heating rates differ slightly near undulating regions of cloud top, and a slight bias in mean heating rate from 1 to 3 h is present, yet the differences are never strong enough to result in a pronounced evolutionary bias in typical boundary layer metrics (e.g. inversion height, vertical velocity variance, TKE). Longer integration times may eventually produce a physical response to the bias in radiative cooling rates. A low-CCN case, designed to produce significant drizzle and induce cloud breakup does show subtle differences between MDRT and IPA. Over the course of the 6 hour simulations, entrainment is slightly less in the MDRT case, and the transition to the surface-based trade cumulus regime is delayed. Mean cooling rates appear systematically weaker in the MDRT case, indicative of a less energetic PBL and reflected in profiles of vertical velocity variance and TKE.

Mechem, David B.; Ovtchinnikov, Mikhail; Kogan, Y. L.; Davis, Anthony B; Cahalan, Robert F.; Takara, Ezra E.; Ellingson, Robert G.

2002-06-03T23:59:59.000Z

52

Investigation of transition to turbulence at low Reynolds numbers using Implicit Large Eddy Simulations with a Discontinuous Galerkin method  

E-Print Network (OSTI)

The present work predicts the formation of laminar separation bubbles at low Reynolds numbers and the related transition to turbulence. In addition to being one of the first Implicit Large Eddy Simulation studies using a ...

Uranga Cabrera, Alejandra (Uranga)

2011-01-01T23:59:59.000Z

53

Selective large-eddy simulation of hypersonic flows. Procedure to activate the filtering in unresolved regions only  

E-Print Network (OSTI)

A new method for the localization of the regions where the turbulent fluctuations are unresolved is applied to the large-eddy simulation (LES) of a compressible turbulent jet with an initial Mach number equal to 5. The localization method used is called selective LES and is based on the exploitation of a scalar probe function f which represents the magnitude of the stretching-tilting term of the vorticity equation normalized with the enstrophy (Tordella et al. 2007). For a fully developed turbulent field of fluctuations, statistical analysis shows that the probability that f is larger than 2 is almost zero, and, for any given threshold, it is larger if the flow is under-resolved. By computing the spatial field of f in each instantaneous realization of the simulation it is possible to locate the regions where the magnitude of the normalized vortical stretching-tilting is anomalously high. The sub-grid model is then introduced into the governing equations in such regions only. The results of the selective LES s...

Tordella, D; Massaglia, S; Mignone, A

2012-01-01T23:59:59.000Z

54

Implicit large eddy simulations of anisotropic weakly compressible turbulence with application to core-collapse supernovae  

E-Print Network (OSTI)

(Abridged) In the implicit large eddy simulation (ILES) paradigm, the dissipative nature of high-resolution shock-capturing schemes is exploited to provide an implicit model of turbulence. Recent 3D simulations suggest that turbulence might play a crucial role in core-collapse supernova explosions, however the fidelity with which turbulence is simulated in these studies is unclear. Especially considering that the accuracy of ILES for the regime of interest in CCSN, weakly compressible and strongly anisotropic, has not been systematically assessed before. In this paper we assess the accuracy of ILES using numerical methods most commonly employed in computational astrophysics by means of a number of local simulations of driven, weakly compressible, anisotropic turbulence. We report a detailed analysis of the way in which the turbulent cascade is influenced by the numerics. Our results suggest that anisotropy and compressibility in CCSN turbulence have little effect on the turbulent kinetic energy spectrum and a...

Radice, David; Ott, Christian D

2015-01-01T23:59:59.000Z

55

Transitions of cloud-topped marine boundary layers characterized by AIRS, MODIS, and a large eddy simulation model  

SciTech Connect

Cloud top entrainment instability (CTEI) is a hypothesized positive feedback between entrainment mixing and evaporative cooling near the cloud top. Previous theoretical and numerical modeling studies have shown that the persistence or breakup of marine boundary layer (MBL) clouds may be sensitive to the CTEI parameter. Collocated thermodynamic profile and cloud observations obtained from the Atmospheric Infrared Sounder (AIRS) and Moderate Resolution Imaging Spectroradiometer (MODIS) instruments are used to quantify the relationship between the CTEI parameter and the cloud-topped MBL transition from stratocumulus to trade cumulus in the northeastern Pacific Ocean. Results derived from AIRS and MODIS are compared with numerical results from the UCLA large eddy simulation (LES) model for both well-mixed and decoupled MBLs. The satellite and model results both demonstrate a clear correlation between the CTEI parameter and MBL cloud fraction. Despite fundamental differences between LES steady state results and the instantaneous snapshot type of observations from satellites, significant correlations for both the instantaneous pixel-scale observations and the long-term averaged spatial patterns between the CTEI parameter and MBL cloud fraction are found from the satellite observations and are consistent with LES results. This suggests the potential of using AIRS and MODIS to quantify global and temporal characteristics of the cloud-topped MBL transition.

Yue, Qing; Kahn, Brian; Xiao, Heng; Schreier, Mathias; Fetzer, E. J.; Teixeira, J.; Suselj, Kay

2013-08-16T23:59:59.000Z

56

A consistent approach to large eddy simulation using adaptive mesh refinement  

SciTech Connect

The large eddy simulation of turbulent flows is discussed with particular attention paid to the issue of commutation of differentiation and filtering. Multi-level adaptive mesh refinement is proposed as a means of mostly avoiding commutation errors where increased grid resolution is required to capture key flow features. The strategy is to employ multiple uniform grids in a nested hierarchy using a constant-width filter for each grid. It is shown that commutivity of fine and coarse grid filters must be enforced in order to consistently relate variables at different refinement levels. Methods for treating fine grid boundaries and walls are also discussed. It is shown that errors associated with boundary treatments are small and localized.

Cook, A.W.

1999-09-01T23:59:59.000Z

57

Large eddy simulation of wind turbine wake dynamics in the stable boundary layer using the Weather Research and Forecasting Model  

Science Journals Connector (OSTI)

Recently an actuator disk parameterization was implemented in the Weather Research and Forecasting (WRF) Model for large eddy simulation (LES) of wind turbine wakes. To thoroughly verify this model simulations of various types of turbines and atmospheric conditions must be evaluated against corresponding experimental data. In this work numerical simulations are compared to nacelle-based scanning lidar measurements taken in stable atmospheric conditions during a field campaign conducted at a wind farm in the western United States. Using several wake characteristics—such as the velocity deficit centerline location and wake width—as metrics for model verification the simulations show good agreement with the observations. Notable results include a high average velocity deficit decreasing from 73% at a downwind distance x of 1.2 rotor diameters (D) to 25% at x?=?6.6D resulting from a low average wind speed and therefore high average turbine thrust coefficient. Moreover the wake width expands from 1.4D at x?=?1.2D to 2.3D at x?=?6.6D. Finally new features—namely rotor tilt and drag from the nacelle and tower—are added to the existing actuator disk model in WRF-LES. Compared to the rotor the effect of the tower and nacelle on the flow is relatively small but nevertheless important for an accurate representation of the entire turbine. Adding rotor tilt to the model causes the vertical location of the wake center to shift upward. Continued advancement of the actuator disk model in WRF-LES will help lead to optimized turbine siting and controls at wind farms.

Matthew L. Aitken; Branko Kosovi?; Jeffrey D. Mirocha; Julie K. Lundquist

2014-01-01T23:59:59.000Z

58

High-Resolution Large-Eddy Simulations of Scalar Transport in Atmospheric Boundary Layer Flow over Complex Terrain  

E-Print Network (OSTI)

of Electric Power Industry, Chiba, Japan FOTINI KATOPODES CHOW Department of Civil and Environmental to the choice of numerical simulation parameters than is typically needed for mean wind field predictions. Large-eddy simulation is used in a mesoscale setting, providing modeling advantages through the use of robust turbulence

Chow, Fotini Katopodes

59

Coupled fluid-structure interaction simulation of floating offshore wind turbines and waves: a large eddy simulation approach  

Science Journals Connector (OSTI)

We develop a computational framework for simulating the coupled interaction of complex floating structures with large-scale ocean waves and atmospheric turbulent winds. The near-field approach features a partitioned fluid-structure interaction model (FSI) combining the curvilinear immersed boundary (CURVIB) method of Borazjani and Sotiropoulos (J. Comput. Phys. 2008) and the two-phase flow level set formulation of Kang and Sotiropoulos (Adv. in Water Res. 2012) and is capable of solving complex free-surface flows interacting non-linearly with complex real life floating structures. The near-field solver is coupled with a large-scale wave and wind model based on the two-fluid approach of Yang and Shen (J. Comput. Phys. 2011) which integrates a viscous Navier-Stokes solver with undulatory boundaries for the motion of the air and an efficient potential-flow based wave solver. The large-scale turbulent wind is incorporated from the far-field solver to the near-field solver by feeding into the latter inlet boundary conditions. The wave field is incorporated to the near-field solver by using the pressure-forcing method of Guo and Shen (J. Comput. Phys. 2009) which has been appropriately adapted to the level set method. The algorithm for coupling the two codes has been validated for a variety of wave cases including a broadband spectrum showing excellent agreement when compared to theoretical results. Finally, the capabilities of the numerical framework are demonstrated by carrying out large eddy simulation (LES) of a floating wind turbine interacting with realistic ocean wind and wave conditions.

Antoni Calderer; Xin Guo; Lian Shen; Fotis Sotiropoulos

2014-01-01T23:59:59.000Z

60

A large-eddy simulation study of wake propagation and power production in an array of tidal-current turbines  

Science Journals Connector (OSTI)

...production in an array of tidal-current turbines Matthew J. Churchfield Ye Li Patrick...performing large-eddy simulations of tidal turbine array flows. First, a horizontally periodic...those data are used as inflow into a tidal turbine array two rows deep and infinitely wide...

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "large-eddy simulation les" 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

Large-Eddy Simulations of Zero-Net-Mass-Flux Jet Based Separation Control in a Canonical Separated  

E-Print Network (OSTI)

Large-Eddy Simulations of Zero-Net-Mass-Flux Jet Based Separation Control in a Canonical Separated by Mittal et al1 for investigating active separation control using zero-net-mass-flux jets. Large. Zero-net-mass-flux forcing of the separated flow at the superharmonics of this baseline lock

Mittal, Rajat

62

Large-Eddy Simulation of Langmuir Turbulence in Pure Wind Seas  

Science Journals Connector (OSTI)

The scaling of turbulent kinetic energy (TKE) and its vertical component (VKE) in the upper ocean boundary layer, forced by realistic wind stress and surface waves including the effects of Langmuir circulations, is investigated using large-eddy ...

Ramsey R. Harcourt; Eric A. D’Asaro

2008-07-01T23:59:59.000Z

63

Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research  

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

2013 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting

64

Large Eddy Simulation (LES) Applied to Advanced Engine Combustion...  

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

over broad operating ranges) - Requirements for efficient and routine use of high-performance computing (HPC), development of both predictive and affordable models for advanced...

65

Large Eddy Simulation (LES) Applied to Advanced Engine Combustion...  

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

for engine combustion and emission control - Efficient and routine use of High-Performance-Computing (HPC) to establish optimal balance between predictive and affordable models...

66

Large Eddy Simulation (LES) Applied to Advanced Engine Combustion...  

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

B. Cuenot, CERFACS, France * Professor A. Dreizler, Technical University of Darmstadt, Germany * Professor B. Geurts, University of Twente, The Netherlands * Professor D. Haworth,...

67

Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research  

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

2012 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting

68

Experimental study of an active grid-generated shearless mixing layer and comparisons with large-eddy simulation  

Science Journals Connector (OSTI)

A shearless mixing layer characterized by interactions between two regions with different turbulence intensities but without mean shear is investigated experimentally in a wind tunnel. Reynolds numbers higher than those of prior studies [B. Gilbert “Diffusion mixing in grid turbulence without mean shear ” J. Fluid Mech.100 349 (1980); S. Veeravalli and Z. Warhaft “The shearless turbulent mixing layer ” J. Fluid Mech.207 191 (1989); B. Knaepen O. Debliquy and D. Carati “Direct numerical simulation and large-eddy simulation of a shear-free mixing layer ” J. Fluid Mech.514 153 (2004); D. Tordella and M. Iovieno “Numerical experiments on the intermediate asymptotics of shear-free turbulent transport and diffusion ” J. Fluid Mech.549 429 (2006); D. A. Briggs J. H. Ferziger J. R. Koseff and S. G. Monismith “Entrainment in a shear-free turbulent mixing layer ” J. Fluid Mech.310 215 (1996)] are achieved by using an active grid with rotating winglets on one-half of its cross section. Stationary flow-conditioning fine meshes are used to avoid mean velocity gradients. Measurements are performed at five different downstream wind-tunnel locations using an X-type hot-wire probe and a stereoscopic particle image velocimetry system. The Reynolds numbers based on the Taylor microscale in the high- and low-kinetic energy regions are 170 and 88 respectively. The energy and integral length-scale ratios between the two regions are 4.27 and 1.73 respectively. The inlet turbulence in the upper and lower portions of the shearless mixing layer is not fully isotropic with the streamwise velocityfluctuations being between 6% and 13% higher than the cross-stream ones. Fundamental statistical properties of the flow are documented and analyzed at various scales using band-pass box-filtered velocities. Downstream evolution of variance and half-width of the mixing layer skewness and flatness factors as well as the statistics of two-point velocity increments at various displacements are presented. It is found that much of the deviations from Gaussian statistics originate from large-scale motions. The data are well suited to be used as initial condition for simulations and as test for large-eddy simulation(LES)models and codes. Comparison studies for three LESmodels including Smagorinsky dynamic Smagorinsky and dynamic mixed nonlinear models are implemented in simulations of temporally decaying shearless mixing layer using a pseudospectral code. Initial conditions are prescribed by matching the longitudinal energy spectra at all heights across the layer for both streamwise and cross-stream velocity components. LES with all three subgrid scale models tested underpredicts the kinetic energy and exhibits deviations from the measured non-Gaussian behaviors. Overall the dynamic Smagorinsky model predicts statistics slightly better than the other two models.

Hyung Suk Kang

2008-01-01T23:59:59.000Z

69

Simulations of an offshore wind farm using large eddy simulation and a torque-controlled actuator disc model  

E-Print Network (OSTI)

We present here a computational fluid dynamics (CFD) simulation of Lillgrund offshore wind farm, which is located in the {\\O}resund Strait between Sweden and Denmark. The simulation combines a dynamic representation of wind turbines embedded within a Large-Eddy Simulation CFD solver, and uses hr-adaptive meshing to increase or decrease mesh resolution where required. This allows the resolution of both large scale flow structures around the wind farm, and local flow conditions at individual turbines; consequently, the response of each turbine to local conditions can be modelled, as well as the resulting evolution of the turbine wakes. This paper provides a detailed description of the turbine model which simulates interactions between the wind, turbine rotors, and turbine generators by calculating the forces on the rotor, the body forces on the air, and instantaneous power output. This model was used to investigate a selection of key wind speeds and directions, investigating cases where a row of turbines would ...

Creech, Angus; Maguire, A Eoghan

2014-01-01T23:59:59.000Z

70

Large-Eddy Simulation of Stratified Turbulence. Part II: Application of the Stretched-Vortex Model to the Atmospheric Boundary Layer  

Science Journals Connector (OSTI)

The buoyancy-adjusted stretched-vortex subgrid-scale (SGS) model is assessed for a number of large-eddy simulations (LESs) corresponding to diverse atmospheric boundary layer conditions. The cases considered are free convection, a moderately ...

Georgios Matheou; Daniel Chung

2014-12-01T23:59:59.000Z

71

Investigation of two industrial developmental injectors using Large Eddy Simulation and ProperOrthogonal Decomposition  

E-Print Network (OSTI)

of the two injectors in both inert and reactive situations. The different codes and models are described in Chapter 3 of Ref. [1] and specific details for each simulation are given in the two following sections. 3.1 Injector A An inert LES simulation... and exhibits frequency peaks at 96.4 Hz, 474.3 Hz, 1035 Hz, 1459 Hz (strongest peak), 1603 Hz, 3507 Hz and 5102 Hz among others. Figure 4.6 shows the previous spectra in log-log scale to give an alternative perspective. 4.1.3 Proper Orthogonal Decomposition...

Ayache, Simon

2012-09-03T23:59:59.000Z

72

Development and assessment of a coupled strategy for conjugate heat transfer with Large Eddy Simulation: Application to a cooled turbine blade  

E-Print Network (OSTI)

Development and assessment of a coupled strategy for conjugate heat transfer with Large Eddy walls is an important phenomenon in combustion chambers and a main design constraint in gas turbines- tionally expensive method, the aim of this paper is to develop and assess a suitable strategy based on LES

Nicoud, Franck

73

Implementation of a generalized actuator disk wind turbine model into the weather research and forecasting model for large-eddy simulation applications  

Science Journals Connector (OSTI)

A generalized actuator disk (GAD) wind turbine parameterization designed for large-eddy simulation (LES) applications was implemented into the Weather Research and Forecasting (WRF) model. WRF-LES with the GAD model enables numerical investigation of the effects of an operating wind turbine on and interactions with a broad range of atmospheric boundary layer phenomena. Numerical simulations using WRF-LES with the GAD model were compared with measurements obtained from the Turbine Wake and Inflow Characterization Study (TWICS-2011) the goal of which was to measure both the inflow to and wake from a 2.3-MW wind turbine. Data from a meteorological tower and two light-detection and ranging (lidar) systems one vertically profiling and another operated over a variety of scanning modes were utilized to obtain forcing for the simulations and to evaluate characteristics of the simulated wakes. Simulations produced wakes with physically consistent rotation and velocity deficits. Two surface heat flux values of 20?W m?2 and 100?W m?2 were used to examine the sensitivity of the simulated wakes to convective instability. Simulations using the smaller heat flux values showed good agreement with wake deficits observed during TWICS-2011 whereas those using the larger value showed enhanced spreading and more-rapid attenuation. This study demonstrates the utility of actuator models implemented within atmospheric LES to address a range of atmospheric science and engineering applications. Validated implementation of the GAD in a numerical weather prediction code such as WRF will enable a wide range of studies related to the interaction of wind turbines with the atmosphere and surface.

J. D. Mirocha; B. Kosovic; M. L. Aitken; J. K. Lundquist

2014-01-01T23:59:59.000Z

74

Large-eddy simulations of impinging over-expanded supersonic jet noise for launcher applications  

Science Journals Connector (OSTI)

During the lift-off phase of a space launcher powerful rocket motors generate harsh acoustic environment on the launch pad. Following the blast waves created at ignition jet noise is a major contributor to the acoustic loads received by the launcher and its payload. Recent simulations performed at ONERA to compute the noise emitted by solid rocket motors at lift-off conditions are described. Far-field noise prediction is achieved by associating a LES solution of the jet flow with an acoustics surface integral method. The computations are carried out with in-house codes CEDRE for the LES solution and KIM for Ffowcs Williams & Hawkings porous surface integration method. The test case is that of a gas generator fired vertically onto a 45 degrees inclined flat plate which impingement point is located 10 diameters from nozzle exit. Computations are run for varied numerical conditions such as turbulence modeling along the plate and different porous surfaces location and type. Results are discussed and compared with experimental acoustic measurements obtained by CNES at MARTEL facility.

2014-01-01T23:59:59.000Z

75

Assessment of combustion noise in a premixed swirled combustor via Large-eddy simulation  

E-Print Network (OSTI)

, 4, 5] as well as to more complex cases such as gas turbine combustors. [6] Corresponding author. Ph methods such as LES or DNS can directly provide the acoustic field radiated by noise sources. The sources are still calculated by DNS or LES codes whereas the radiated sound is evaluated by acoustic codes

Boyer, Edmond

76

A quadrature-based LES/transported probability density function approach for  

E-Print Network (OSTI)

and inexpensive pathway for scramjet design. In the recent past, the large eddy simulation (LES) methodology has

Raman, Venkat

77

Numerical Investigation of a Transverse Jet in a Supersonic Crossflow using Large Eddy Simulation  

E-Print Network (OSTI)

inside a SCRAMJET combustor, ignition and flame-holding capabilities are critical to the development-fueled SCRAMJET engine for Mach 6 flight condition. Following a LES approach, Lavante et al.4 succeed to recover

Paris-Sud XI, Université de

78

The emerging role of large eddy simulation in industrial practice: challenges and opportunities  

Science Journals Connector (OSTI)

...author over recent years. Particular...spoiler. In Advances in hybrid...43rd AIAA Aerospace Sciences Meeting and...eds) 2008 Advances in hybrid...approach. In Advances in DNS/LES...AIAA 39th Aerospace Science Meeting...

2009-01-01T23:59:59.000Z

79

Large-Eddy Simulation of Evaporating Spray in a Coaxial Combustor  

E-Print Network (OSTI)

of engineering applications; e.g. internal combustion engines, liquid and solid propellant rocket motors, gas-turbine representative of gas-turbine combustors. Key words: Sprays, LES, unstructured grids, particle-laden flows complex. In gas turbine combustors, for example, the liquid fuel jet undergoes primary and secondary

Mahesh, Krishnan

80

Large-Eddy Simulation Study of Wake Propagation and Power Production in an Array of Tidal-Current Turbines: Preprint  

SciTech Connect

This paper presents our initial work in performing large-eddy simulations of tidal turbine array flows. First, a horizontally-periodic precursor simulation is performed to create turbulent flow data. Then that data is used to determine the inflow into a tidal turbine array two rows deep and infinitely wide. The turbines are modeled using rotating actuator lines, and the finite-volume method is used to solve the governing equations. In studying the wakes created by the turbines, we observed that the vertical shear of the inflow combined with wake rotation causes lateral wake asymmetry. Also, various turbine configurations are simulated, and the total power production relative to isolated turbines is examined. Staggering consecutive rows of turbines in the simulated configurations allows the greatest efficiency using the least downstream row spacing. Counter-rotating consecutive downstream turbines in a non-staggered array shows a small benefit. This work has identified areas for improvement, such as the use of a larger precursor domain to better capture elongated turbulent structures, the inclusion of salinity and temperature equations to account for density stratification and its effect on turbulence, improved wall shear stress modeling, and the examination of more array configurations.

Churchfield, M. J.; Li, Y.; Moriarty, P. J.

2011-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "large-eddy simulation les" 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

Large-Eddy Simulation Study of Wake Propagation and Power Production in an Array of Tidal-Current Turbines: Preprint  

SciTech Connect

This paper presents our initial work in performing large-eddy simulations of tidal turbine array flows. First, a horizontally-periodic precursor simulation is performed to create turbulent flow data. Then that data is used as inflow into a tidal turbine array two rows deep and infinitely wide. The turbines are modeled using rotating actuator lines, and the finite-volume method is used to solve the governing equations. In studying the wakes created by the turbines, we observed that the vertical shear of the inflow combined with wake rotation causes lateral wake asymmetry. Also, various turbine configurations are simulated, and the total power production relative to isolated turbines is examined. Staggering consecutive rows of turbines in the simulated configurations allows the greatest efficiency using the least downstream row spacing. Counter-rotating consecutive downstream turbines in a non-staggered array shows a small benefit. This work has identified areas for improvement, such as the use of a larger precursor domain to better capture elongated turbulent structures, the inclusion of salinity and temperature equations to account for density stratification and its effect on turbulence, improved wall shear stress modelling, and the examination of more array configurations.

Churchfield, M. J.; Li, Y.; Moriarty, P. J.

2012-07-01T23:59:59.000Z

82

Applications of large eddy simulation methods to gyrokinetic turbulence A. Ban Navarro, B. Teaca, F. Jenko, G. W. Hammett, T. Happel, and ASDEX Upgrade Team  

E-Print Network (OSTI)

Applications of large eddy simulation methods to gyrokinetic turbulence A. Bañón Navarro, B. Teaca~non Navarro,1,a) B. Teaca,2,3,4 F. Jenko,1,4 G. W. Hammett,4,5 T. Happel,1 and ASDEX Upgrade Team1 1 Max

Hammett, Greg

83

Large eddy simulation of flows in industrial compressors: a path from 2015 to 2035  

Science Journals Connector (OSTI)

...using two different turbine designs. J. Turbomach...eddy simulation for turbines: methodologies...eddy simulation of gas turbine compressors. Progr...T Poinsot. 2009 Development and assessment of a coupled strategy for conjugate heat...

2014-01-01T23:59:59.000Z

84

Validation/Uncertainty Quantification for Large Eddy Simulations of the heat flux in the Tangentially Fired Oxy-Coal Alstom Boiler Simulation Facility  

SciTech Connect

The objective of this task is to produce predictive capability with quantified uncertainty bounds for the heat flux in commercial-scale, tangentially fired, oxy-coal boilers. Validation data came from the Alstom Boiler Simulation Facility (BSF) for tangentially fired, oxy-coal operation. This task brings together experimental data collected under Alstom’s DOE project for measuring oxy-firing performance parameters in the BSF with this University of Utah project for large eddy simulation (LES) and validation/uncertainty quantification (V/UQ). The Utah work includes V/UQ with measurements in the single-burner facility where advanced strategies for O2 injection can be more easily controlled and data more easily obtained. Highlights of the work include: • Simulations of Alstom’s 15 megawatt (MW) BSF, exploring the uncertainty in thermal boundary conditions. A V/UQ analysis showed consistency between experimental results and simulation results, identifying uncertainty bounds on the quantities of interest for this system (Subtask 9.1) • A simulation study of the University of Utah’s oxy-fuel combustor (OFC) focused on heat flux (Subtask 9.2). A V/UQ analysis was used to show consistency between experimental and simulation results. • Measurement of heat flux and temperature with new optical diagnostic techniques and comparison with conventional measurements (Subtask 9.3). Various optical diagnostics systems were created to provide experimental data to the simulation team. The final configuration utilized a mid-wave infrared (MWIR) camera to measure heat flux and temperature, which was synchronized with a high-speed, visible camera to utilize two-color pyrometry to measure temperature and soot concentration. • Collection of heat flux and temperature measurements in the University of Utah’s OFC for use is subtasks 9.2 and 9.3 (Subtask 9.4). Several replicates were carried to better assess the experimental error. Experiments were specifically designed for the generation of high-fidelity data from a turbulent oxy-coal flame for the validation of oxy-coal simulation models. Experiments were also conducted on the OFC to determine heat flux profiles using advanced strategies for O2 injection. This is important when considering retrofit of advanced O2 injection in retrofit configurations.

Smith, P.J.; Eddings, E.G.; Ring, T.; Thornock, J.; Draper, T.; Isaac, B.; Rezeai, D.; Toth, P.; Wu, Y.; Kelly, K.

2014-08-01T23:59:59.000Z

85

Large eddy simulation of flows in industrial compressors: a path from 2015 to 2035  

Science Journals Connector (OSTI)

...eddy simulation of flows in industrial compressors: a path from...flow that develops in such industrial machines is extremely hard...TM-2009-215627, NASA Glenn Research Center. 6 McMullan, WA , and GJ...Poinsot. 2009 Development and assessment of a coupled strategy for...

2014-01-01T23:59:59.000Z

86

Quantifying the sensitivity of wind farm performance to array layout options using large-eddy simulation  

E-Print Network (OSTI)

the effects of array layout on the performance of offshore wind farms. Array layout is characterized by the spacing between wind turbines (along and across the prevailing wind direction) and by their alignment and is coupled with an actuator line model to simulate the effects of the rotating wind turbine blades. A control

87

Coupling a Mesoscale Numerical Weather Prediction Model with Large-Eddy Simulation for Realistic Wind Plant Aerodynamics Simulations (Poster)  

SciTech Connect

Wind plant aerodynamics are influenced by a combination of microscale and mesoscale phenomena. Incorporating mesoscale atmospheric forcing (e.g., diurnal cycles and frontal passages) into wind plant simulations can lead to a more accurate representation of microscale flows, aerodynamics, and wind turbine/plant performance. Our goal is to couple a numerical weather prediction model that can represent mesoscale flow [specifically the Weather Research and Forecasting model] with a microscale LES model (OpenFOAM) that can predict microscale turbulence and wake losses.

Draxl, C.; Churchfield, M.; Mirocha, J.; Lee, S.; Lundquist, J.; Michalakes, J.; Moriarty, P.; Purkayastha, A.; Sprague, M.; Vanderwende, B.

2014-06-01T23:59:59.000Z

88

A Large-Eddy Simulation Study of Wake Propagation and Power Production in an Array of Tidal-Current Turbines: Preprint  

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

Large-Eddy Simulation Study Large-Eddy Simulation Study of Wake Propagation and Power Production in an Array of Tidal- Current Turbines Preprint M.J. Churchfield, Y. Li, and P.J. Moriarty To be presented at the 9 th European Wave and Tidal Energy Conference 2011 Southhampton, England September 4 - 9, 2011 Conference Paper NREL/CP-5000-51765 July 2011 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 Government and Alliance retain a nonexclusive royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for US Government purposes. This report was prepared as an account of work sponsored by an agency of the United States government.

89

The prospect of using large eddy and detached eddy simulations in engineering design, and the research required to get there  

Science Journals Connector (OSTI)

...computer science in future...Research that advances our LES technology...flows, and recent research...realistic aerospace problems...approach. In Advances in DNS...52nd AIAA Aerospace Sciences Meeting...50th AIAA Aerospace Sciences Meeting...

2014-01-01T23:59:59.000Z

90

Large Eddy Simulation (LES) Applied to Low-Temperature and Diesel Engine Combustion Research  

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

2011 DOE Hydrogen and Fuel Cells Program, and Vehicle Technologies Program Annual Merit Review and Peer Evaluation

91

Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine Combustion Research  

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

2009 DOE Hydrogen Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting, May 18-22, 2009 -- Washington D.C.

92

Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine Combustion Research  

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

2010 DOE Vehicle Technologies and Hydrogen Programs Annual Merit Review and Peer Evaluation Meeting, June 7-11, 2010 -- Washington D.C.

93

LES/probability density function approach for the simulation of an ethanol spray flame  

E-Print Network (OSTI)

LES/probability density function approach for the simulation of an ethanol spray flame Colin Heye a an experimental pilot-stabilized ethanol spray flame. In this particular flame, droplet evaporation occurs away: Large-eddy simulation; Probability density function; Flamelet/progress variable approach; Ethanol

Raman, Venkat

94

The prospect of using large eddy and detached eddy simulations in engineering design, and the research required to get there  

Science Journals Connector (OSTI)

...causality-breaking simulation allows for...governing equations are satisfied...equation. The process is illustrated...impact of Matlab, which democratized matrix manipulations...the design process? This is...causality-breaking simulation only need...TR-2008-13.pdf . 2 Amarasinghe...Navier-Stokes equations on up to...

2014-01-01T23:59:59.000Z

95

Researchers at the National Renewable Energy Laboratory (NREL) develop a high-fidelity large-eddy simulation model  

E-Print Network (OSTI)

to simulate events such as frontal passages through a wind plant and their effect on turbine power production-eddy simulation model designed to predict the performance of large wind plants with a higher degree of accuracy than current models. As the market for wind energy grows, wind turbines and wind plants are becoming

96

A large-eddy simulation study of wake propagation and power production in an array of tidal-current turbines  

Science Journals Connector (OSTI)

...consecutive rows of turbines in the simulated...allows the greatest efficiency using the least...the next upstream turbines, an efficiency increase of about...performance and efficiency of a tidal turbine array. Table 1...

2013-01-01T23:59:59.000Z

97

A Case Study of Radar Observations and WRF LES Simulations of the Impact of Ground-Based Glaciogenic Seeding on Orographic Clouds and Precipitation. Part I: Observations and Model Validations  

Science Journals Connector (OSTI)

Profiling airborne radar data and accompanying large-eddy-simulation (LES) modeling are used to examine the impact of ground-based glaciogenic seeding on cloud and precipitation in a shallow stratiform orographic winter storm. This storm occurred ...

Xia Chu; Lulin Xue; Bart Geerts; Roy Rasmussen; Daniel Breed

2014-10-01T23:59:59.000Z

98

An evaluation of the assumed beta probability density function subgrid-scale model for large eddy simulation of nonpremixed, turbulent combustion with heat release  

SciTech Connect

The assumed beta distribution model for the subgrid-scale probability density function (PDF) of the mixture fraction in large eddy simulation of nonpremixed, turbulent combustion is tested, a priori, for a reacting jet having significant heat release (density ratio of 5). The assumed beta distribution is tested as a model for both the subgrid-scale PDF and the subgrid-scale Favre PDF of the mixture fraction. The beta model is successful in approximating both types of PDF but is slightly more accurate in approximating the normal (non-Favre) PDF. To estimate the subgrid-scale variance of mixture fraction, which is required by the beta model, both a scale similarity model and a dynamic model are used. Predictions using the dynamic model are found to be more accurate. The beta model is used to predict the filtered value of a function chosen to resemble the reaction rate. When no model is used, errors in the predicted value are of the same order as the actual value. The beta model is found to reduce this error by about a factor of two, providing a significant improvement. (c) 2000 American Institute of Physics.

Wall, Clifton [Center for Turbulence Research, Stanford University, Stanford, California 94305 (United States)] [Center for Turbulence Research, Stanford University, Stanford, California 94305 (United States); Boersma, Bendiks Jan [Center for Turbulence Research, Stanford University, Stanford, California 94305 (United States)] [Center for Turbulence Research, Stanford University, Stanford, California 94305 (United States); Moin, Parviz [Center for Turbulence Research, Stanford University, Stanford, California 94305 (United States)] [Center for Turbulence Research, Stanford University, Stanford, California 94305 (United States)

2000-10-01T23:59:59.000Z

99

Hybrid LES–RANS: back scatter from a scale-similarity model used as forcing  

Science Journals Connector (OSTI)

...model is used as forcing in hybrid LES-RANS, stimulating the...support by Swedish National Infrastructure for Computing (SNIC) for...issues/large_eddies.xhtml Hybrid LES-RANS: back scatter from...other way around as forcing in hybrid large eddy simulation-Reynolds-averaged...

2009-01-01T23:59:59.000Z

100

LES of a Spatially Developing Atmospheric Boundary Layer: Application of a Fringe Method for the Stratocumulus to Shallow Cumulus Cloud Transition  

Science Journals Connector (OSTI)

An arrangement of a large-eddy simulation (LES) is described that facilitates a spatially developing thermally stratified atmospheric boundary layer (ABL). When the inflow and outflow boundary conditions are specified, the LES of stably stratified ...

M. Inoue; G. Matheou; J. Teixeira

2014-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "large-eddy simulation les" 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.


101

A Comparison of the Dynamic Wake Meandering Model, Large-Eddy...  

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

Wake Meandering Model, Large-Eddy Simulation, and Field Data at the Egmond aan Zee Offshore Wind Plant Preprint M.J. Churchfield and P.J. Moriarty National Renewable Energy...

102

Grid resolution effects on LES of a piloted methane-air flame K. A. Kemenov  

E-Print Network (OSTI)

not only for canonical geome- tries like laboratory jet flames but also for complex ones like gas-turbine in the flame shows some residual grid dependence. Introduction Large Eddy Simulation (LES) has proved

103

NREL researchers are the first to use a high-performance com-puting tool for a large-eddy simulation of an entire wind plant.  

E-Print Network (OSTI)

at least 50% wastepaper, including 10% post consumer waste. NREL Develops Simulations forWind Plant Power-eddy simulation of an entire wind plant. Researchers at the National Renewable Energy Laboratory's (NREL) National an existing wind plant, augmenting previous studies of wind plant subsets. Wind turbines extract energy from

104

Numerical Simulation of Micro?atmospheric Environment by LES in a District of Beijing  

Science Journals Connector (OSTI)

This paper investigates wind field and traffic pollutant dispersion at street level in a local urban area. A coupling method is employed between the mesoscale model weather research and forecast (WRF) for the atmospheric flow of whole city and the large eddy simulation (LES) method for local environmental flows. A combined model is proposed for building clusters in the urban area. The wind speed temperature and carbon monoxide concentration fields are computed from 9 am of October 26 2009 to 8 am of the next day in a district of Beijing and the results show a good agreement with the observation.

Y. S. Liu; S. G. Miao; C. L. Zhang; G. X. Cui; Z. S. Zhang

2011-01-01T23:59:59.000Z

105

Large eddy simulation applications in gas turbines  

Science Journals Connector (OSTI)

...exhaust plume development. The application...modelling in the gas turbine combustor...modelling strategies for the complex...flows in the gas turbine, as surveyed...of typical gas turbine parts necessitates...made in the development and application...

2009-01-01T23:59:59.000Z

106

Developing large eddy simulation for turbomachinery applications  

Science Journals Connector (OSTI)

...development. In Int. Conf. on Scientific and Engineering Computation, Singapore, July 2004...PhD thesis, Department of Mechanical Engineering, University of Sheffield, UK. Audio Supplement Audio Supplement Audio files from the Applied...

2009-01-01T23:59:59.000Z

107

Simulating flow separation from continuous surfaces: routes to overcoming the Reynolds number barrier  

Science Journals Connector (OSTI)

...exposition given in a recent paper by Tessicini et...LES. In Proc. 40th Aerospace Sciences Meeting, Reno, NV...large-eddy simulations. In Advances in turbulence R. Benzi1995pp...LES approach. In Advances in DNS/LES, 1st AFOSR...

2009-01-01T23:59:59.000Z

108

A multivariate quadrature based moment method for LES based modeling of supersonic combustion  

E-Print Network (OSTI)

function (PDF) approach is a powerful technique for large eddy simulation (LES) based modeling of scramjet and robust scramjet engine is critical for the1 realization of hypersonic flight. Availability of predictive computational models will provide2 a fast and efficient means for designing and optimizing scramjet engines

Raman, Venkat

109

Large Eddy Simulation of Industrial Flares Philip Smith  

E-Print Network (OSTI)

At the Institute for Clean and Secure Energy at the University of Utah we are focused on education through and private industry companies to promote rapid deployment of new technologies through the use of high to solve many industrially relevant problems such as industrial flares, oxy-coal combustion processes

Utah, University of

110

Large eddy simulation modelling of combustion for propulsion applications  

Science Journals Connector (OSTI)

...but also for power generation and for marine applications. The current trend is to...travel are the vehicle design and the propulsion system, and how to integrate them. Two types of propulsion systems, ramjets (Fry 2004) and scramjets...

2009-01-01T23:59:59.000Z

111

Large Eddy Simulations of Jet Flow Interactions Within Rod Bundles  

E-Print Network (OSTI)

The present work investigates the turbulent jet flow mixing of downward impinging jets within a staggered rod bundle based on previous experimental work. The two inlet jets had Reynold's numbers of 11,160 and 6,250 and were chosen to coincide...

Salpeter, Nathaniel O.

2010-07-14T23:59:59.000Z

112

Large-eddy simulation of multiphase flows in complex combustors  

E-Print Network (OSTI)

combustors and biomass gasifiers involv- ing swirling motions. The combustion chambers of propulsion systems of turbulent mixing and combustion dynamics. Our goal in the present work is to develop a computational tool combustion engines, liquid and solid propellant rocket motors, gas-turbine aircraft engines, cyclone

Mahesh, Krishnan

113

Weather Forecasting using GPU-based Large-Eddy Simulations  

Science Journals Connector (OSTI)

Since the advent of computers midway through the 20th century, computational resources have increased exponentially. It is likely they will continue to do so, especially when accounting for recent trends in multi-core processors. History has shown that ...

Jerôme Schalkwijk; Harmen J.J. Jonker; A. Pier Siebesma; Erik van Meijgaard

114

Large eddy simulation of turbulence within heat exchangers  

E-Print Network (OSTI)

be problematic if the turbulent energy is near the tubes natural frequency. However, as compared to the drag force exerted by the fluid, vortex shedding and turbulent buffeting are are of lesser significance than fluid elastic instability. Fluid elastic... on turbulent statistics. Is is widely accepted that there are four basic sources of cross-flow excitation in tube banks: vortex shedding, turbulent buffeting, fluid-elastic instability, and acoustic resonance (Grover et aL 1978). Vortex shedding is a...

Pruitt, John Myron

2012-06-07T23:59:59.000Z

115

LES Modeling for IC Engines  

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

Large eddy simulation offers better accuracy and sensitivity to study cyclic variability, mode transition and mixing effects in engine design and operation

116

Dynamic procedure for filtered gyrokinetic simulations  

SciTech Connect

Large eddy simulations (LES) of gyrokinetic plasma turbulence are investigated as interesting candidates to decrease the computational cost. A dynamic procedure is implemented in the gene code, allowing for dynamic optimization of the free parameters of the LES models (setting the amplitudes of dissipative terms). Employing such LES methods, one recovers the free energy and heat flux spectra obtained from highly resolved direct numerical simulations. Systematic comparisons are performed for different values of the temperature gradient and magnetic shear, parameters which are of prime importance in ion temperature gradient driven turbulence. Moreover, the degree of anisotropy of the problem, which can vary with parameters, can be adapted dynamically by the method that shows gyrokinetic large eddy simulation to be a serious candidate to reduce numerical cost of gyrokinetic solvers.

Morel, P.; Banon Navarro, A.; Albrecht-Marc, M.; Carati, D. [Statistical and Plasma Physics Laboratory, Universite Libre de Bruxelles, Bruxelles 1050 (Belgium); Merz, F.; Goerler, T.; Jenko, F. [Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, D-85748 Garching (Germany)

2012-01-15T23:59:59.000Z

117

Simulating atmosphere flow for wind energy applications with WRF-LES  

SciTech Connect

Forecasts of available wind energy resources at high spatial resolution enable users to site wind turbines in optimal locations, to forecast available resources for integration into power grids, to schedule maintenance on wind energy facilities, and to define design criteria for next-generation turbines. This array of research needs implies that an appropriate forecasting tool must be able to account for mesoscale processes like frontal passages, surface-atmosphere interactions inducing local-scale circulations, and the microscale effects of atmospheric stability such as breaking Kelvin-Helmholtz billows. This range of scales and processes demands a mesoscale model with large-eddy simulation (LES) capabilities which can also account for varying atmospheric stability. Numerical weather prediction models, such as the Weather and Research Forecasting model (WRF), excel at predicting synoptic and mesoscale phenomena. With grid spacings of less than 1 km (as is often required for wind energy applications), however, the limits of WRF's subfilter scale (SFS) turbulence parameterizations are exposed, and fundamental problems arise, associated with modeling the scales of motion between those which LES can represent and those for which large-scale PBL parameterizations apply. To address these issues, we have implemented significant modifications to the ARW core of the Weather Research and Forecasting model, including the Nonlinear Backscatter model with Anisotropy (NBA) SFS model following Kosovic (1997) and an explicit filtering and reconstruction technique to compute the Resolvable Subfilter-Scale (RSFS) stresses (following Chow et al, 2005).We are also modifying WRF's terrain-following coordinate system by implementing an immersed boundary method (IBM) approach to account for the effects of complex terrain. Companion papers presenting idealized simulations with NBA-RSFS-WRF (Mirocha et al.) and IBM-WRF (K. A. Lundquist et al.) are also presented. Observations of flow through the Altamont Pass (Northern California) wind farm are available for validation of the WRF modeling tool for wind energy applications. In this presentation, we use these data to evaluate simulations using the NBA-RSFS-WRF tool in multiple configurations. We vary nesting capabilities, multiple levels of RSFS reconstruction, SFS turbulence models (the new NBA turbulence model versus existing WRF SFS turbulence models) to illustrate the capabilities of the modeling tool and to prioritize recommendations for operational uses. Nested simulations which capture both significant mesoscale processes as well as local-scale stable boundary layer effects are required to effectively predict available wind resources at turbine height.

Lundquist, J K; Mirocha, J D; Chow, F K; Kosovic, B; Lundquist, K A

2008-01-14T23:59:59.000Z

118

Microsoft Word - 40975_CFDR_LES Software_Factsheet_Rev01_00-00-03.doc  

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

LES Software for the Design of Low Emission Combustion Systems for Vision 21 Plants I. Project Participants CFD Research Corporation (Prime) Siemens-Westinghouse Georgia Institute of Technology Pratt&Whitney University of California, Berkeley Woodward FST Virginia Tech Parker Hannifin Rolls-Royce GE Power Systems Solar Turbines John Zink Company Coen Company Vapor Power McDermott Technologies RamGen Power Air Force Research Laboratory NASA Glenn Research II. Project Description Objectives: In this three-year project, an advanced computational software tool based on Large Eddy Simulation (LES) methods is being developed for the design of low emission combustion systems required for Vision 21 clean energy plants.

119

LES SOFTWARE FOR THE DESIGN OF LOW EMISSION COMBUSTION SYSTEMS FOR VISION 21 PLANTS  

SciTech Connect

Application and testing of the new combustion Large Eddy Simulation (LES) code for the design of advanced gaseous combustion systems is described in this 12th quarterly report. In this quarter, continued validation and testing of the combustion LES code was performed for the DOE-SimVal combustor. Also, beta testing by six consortium members was performed for various burner and combustor configurations. A list of suggested code improvements by the beta testers was itemized. Work will continue in FY04. A conditional modification to the contract will be granted. The additional work will focus on modeling/analyzing the SimVal experiments.

Clifford Smith

2003-09-01T23:59:59.000Z

120

LES-based Eulerian PDF approach for the simulation of scramjet combustors  

E-Print Network (OSTI)

LES-based Eulerian PDF approach for the simulation of scramjet combustors Heeseok Koo , Pratik simulation (LES) based simulation of scramjets is developed. To solve the high- dimensional joint of moments (SeQMOM); Probability density function; Scramjet combustor; Oscillatory reactive motion 1

Raman, Venkat

Note: This page contains sample records for the topic "large-eddy simulation les" 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

Large-eddy Simulation of the Nighttime Stable Atmospheric Boundary Layer  

E-Print Network (OSTI)

by providing accurate vertical wind speed profiles. TurbineC-1 Schematic of vertical wind speed and density profiles in50,000 s) vertical profiles of wind speed for the moderately

Zhou, Bowen

2012-01-01T23:59:59.000Z

122

Massively-Parallel Spectral Element Large Eddy Simulation of a Ring-Type Gas Turbine Combustor  

E-Print Network (OSTI)

-Stokes . . . . . . . . . . . . . 28 D. NEK5000 . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 E. Geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 F. Mesh Generation . . . . . . . . . . . . . . . . . . . . . . . 36 III RESULTS AND DISCUSSION... in consumer vehicles and creating faster commercial jets. While discovering new energy resources in itself is an important concept, the rate of energy consumption, or power, is perhaps equally important. Power generation is what drives the modern world...

Camp, Joshua Lane

2012-07-16T23:59:59.000Z

123

Large-eddy simulation of evaporating spray in a coaxial combustor  

E-Print Network (OSTI)

on unstructured grids at conditions representative of gas-turbine combustors. Ã? 2009 The Combustion Institute of engineering applications; e.g., inter- nal combustion engines, liquid and solid propel- lant rocket motors, gas-turbine aircraft engines, cyclone combustors, and biomass gasifiers. The physics of such flows

Apte, Sourabh V.

124

Large-eddy simulation of swirling particle-laden flows in a coaxial-jet combustor  

E-Print Network (OSTI)

combustion engines, liquid and solid propellant rocket motors, gas-turbine aircraft engines, International. In gas turbine combustors, for example, the liquid fuel jet undergoes primary and secondary atomization on structured grids and do not lend themselves applicable to the complex geometries of engineering gas-turbine

Apte, Sourabh V.

125

Large eddy simulation for predicting turbulent heat transfer in gas turbines  

Science Journals Connector (OSTI)

...predicting turbulent heat transfer in gas turbines Danesh K. Tafti Long He K. Nagendra...of propulsion and power generation gas turbines. Accurate prediction of blade metal...compressed bypass air and allow higher turbine inlet temperature, increasing fuel efficiency...

2014-01-01T23:59:59.000Z

126

Large-Eddy Simulation of Pulverized Coal Jet Flame -Effect of Oxygen Concentration on NOx formation  

E-Print Network (OSTI)

than those by using other fossil fuels [1]. It is therefore important to develop clean coal technology for pulverized coal fired power plants, in order to control such emissions and to reduce the environmental impact. Regarding the reduction...

Muto, Masaya; Watanabe, Hiroaki; Kurose, Ryoichi; Komori, Satoru; Balusamy, Saravanan; Hochgreb, Simone

2015-01-01T23:59:59.000Z

127

Large Eddy Simulation based Studies of Reacting and Non-reacting Transverse Jets in Supersonic Crossflow  

E-Print Network (OSTI)

-ignition and flame stability. To ensure e cient and robust combustion inside scramjet engines, fuel injection of these designs is necessary for the design of e cient scramjet engines. The focus of this work is to use detailed

Raman, Venkat

128

Large-Eddy Simulation of a Supersonic Inlet-Isolator Heeseok Koo  

E-Print Network (OSTI)

in a dual-mode scramjet engine that provides stable compressed flow to the combustor. However in the design of robust scramjet engines. Here, the predictive capability of the large ramjet engines are vital for the realization of hypersonic flight. Scramjets are relatively simple

Raman, Venkat

129

Turbulence prediction using the large eddy simulation method in staggered and inlined bundles  

E-Print Network (OSTI)

for the fruitful discussions and technical support they provided throughout the investigation. Discussions with Mr. Wael Ibrahim, Mr. SaeYul Lee and Mr. John Pruitt were also helpful for a better understanding of the intricacies of turbulence and computational...

Barsamian, Hagop Raffi

1994-01-01T23:59:59.000Z

130

Complex Effects in Large Eddy Simulation Limassol, September 20-24,2005  

E-Print Network (OSTI)

a requirement for combustion instability studies. 1 INTRODUCTION In the highly competitive field of power generation, gas turbines have gained an increasing role over the years. New emission regulations and growing

131

Large-Eddy Simulations of Perfectly-Expanded Supersonic Jets: Quality Assessment and Validation  

E-Print Network (OSTI)

but use an emulation procedure, with sources and sinks with zero net mass flux. This procedure gives the contributions of the different explicit models introduced in the calculation (artificial dissipation, subgrid

Mendez, Simon

132

Assessment of combustion noise in a premixed swirled combustor via Large-Eddy Simulation  

E-Print Network (OSTI)

­5] as well as to more complex cases such as gas turbine combustors [6]. Computational techniques must be large enough to include the sources of noise as well as part of the acoustic near field [7 Acoustic analogy Direct computation Hybrid computation a b s t r a c t Today, much of the current effort

Nicoud, Franck

133

Fidelity of Analytic Drop Size Distributions in Drizzling Stratiform Clouds Based on Large-Eddy Simulations  

E-Print Network (OSTI)

Cloud microphysical parameterizations and retrievals rely heavily on knowledge of the shape of drop size distributions (DSDs). Many investigations assume that DSDs in the entire or partial drop size range may be approximated ...

Kogan, Yefim L.; Kogan, Zena N.; Mechem, David B.

2009-08-01T23:59:59.000Z

134

Large eddy simulations of premixed turbulent flame dynamics : combustion modeling, validation and analysis  

E-Print Network (OSTI)

High efficiency, low emissions and stable operation over a wide range of conditions are some of the key requirements of modem-day combustors. To achieve these objectives, lean premixed flames are generally preferred as ...

Kewlani, Gaurav

2014-01-01T23:59:59.000Z

135

Large-eddy Simulation of the Nighttime Stable Atmospheric Boundary Layer  

E-Print Network (OSTI)

Emissions from Landfills". Submitted to Environmentalflow rate on top of the landfill from 1400 LST onwards. Toplume dispersion over a landfill and good results are

Zhou, Bowen

2012-01-01T23:59:59.000Z

136

Large eddy simulation for predicting turbulent heat transfer in gas turbines  

Science Journals Connector (OSTI)

...wall functions|ribbed duct| 1. Background Gas turbine technology plays a critical role in civilian as well as...generation. One of the key challenges in the development of advanced gas turbines is effective thermal management in the high-pressure...

2014-01-01T23:59:59.000Z

137

Study of natural ventilation in buildings by large eddy simulation Yi Jiang and Qingyan Chen*  

E-Print Network (OSTI)

in buildings can create a comfortable and healthy indoor environment, and can save energy used constitutes a major part of the energy consumption in buildings. To reduce energy used by mechanical cooling is driven in and out of a building due to pressure differences, produced by wind and buoyancy forces

Chen, Qingyan "Yan"

138

Measurement and simulation of swirling coal combustion  

Science Journals Connector (OSTI)

Particle image velocimetry (PIV), thermocouples and flue gas analyzer are used to study swirling coal combustion and NO formation under different secondary-air ratios. Eulerian–Lagrangian large-eddy simulation (LES) using the Smagorinsky–Lilly sub-grid scale stress model, presumed-PDF fast chemistry and eddy-break-up (EBU) gas combustion models, particle devolatilization and particle combustion models, are simultaneously used to simulate swirling coal combustion. Statistical LES results are validated by measurement results. Instantaneous LES results show that the coherent structures for swirling coal combustion are stronger than those for swirling gas combustion. Particles are shown to concentrate along the periphery of the coherent structures. Combustion flame is located in the high vorticity and high particle concentration zones. Measurement shows that secondary-air ratios have little effect on final NO formation at the exit of the combustor.

Liyuan Hu; Lixing Zhou; Yonghao Luo; Caisong Xu

2013-01-01T23:59:59.000Z

139

Marine low cloud sensitivity to an idealized climate change: The CGILS LES intercomparison  

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

low low cloud sensitivity to an idealized climate change: The CGILS LES intercomparison Peter N. Blossey, 1 Christopher S. Bretherton, 1 Minghua Zhang, 2 Anning Cheng, 3 Satoshi Endo, 4 Thijs Heus, 5 Yangang Liu, 4 Adrian P. Lock, 6 Stephan R. de Roode, 7 and Kuan-Man Xu 8 Received 31 July 2012; revised 4 February 2013; accepted 20 February 2013. [1] Subtropical marine low cloud sensitivity to an idealized climate change is com- pared in six large-eddy simulation (LES) models as part of CGILS. July cloud cover is simulated at three locations over the subtropical northeast Pacific Ocean, which are typified by cold sea surface temperatures (SSTs) under well-mixed stratocumulus, cool SSTs under decoupled stratocumulus, and shallow cumulus clouds overlying warmer SSTs. The idealized climate change includes a uniform 2 K SST increase with corre- sponding moist-adiabatic warming aloft and

140

LES and experimental studies of cold and reacting flow in a swirled partially premixed burner with and without fuel modulation  

SciTech Connect

In devices where air and fuel are injected separately, combustion processes are influenced by oscillations of the air flow rate but may also be sensitive to fluctuations of the fuel flow rate entering the chamber. This paper describes a joint experimental and numerical study of the mechanisms controlling the response of a swirled complex-geometry combustor burning natural gas and air. The flow is first characterized without combustion and LDV results are compared to large eddy simulation (LES) data. The nonpulsated reacting regime is then studied and characterized in terms of the heat release field. Finally the fuel flow rate is pulsated at several amplitudes and the response of the chamber is analyzed using phase-locked averaging and acoustic analysis. Results show that LES and acoustic analysis predict the flame dynamics in this complex configuration with accuracy when heat losses (radiation and convection) are accounted for. (author)

Sengissen, A.X. [CERFACS, 42 Avenue G. Coriolis, 31057 Toulouse cedex (France); Van Kampen, J.F.; Huls, R.A.; Stoffels, G.G.M.; Kok, J.B.W. [University of Twente, Faculty of Engineering, 7500 AE Enschede (Netherlands); Poinsot, T.J. [CERFACS, 42 Avenue G. Coriolis, 31057 Toulouse cedex (France); IMFT, Avenue C. Soula, 31400 Toulouse (France)

2007-07-15T23:59:59.000Z

Note: This page contains sample records for the topic "large-eddy simulation les" 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

LES SOFTWARE FOR THE DESIGN OF LOW EMISSION COMBUSTION SYSTEMS FOR VISION 21 PLANTS  

SciTech Connect

Further development of a combustion Large Eddy Simulation (LES) code for the design of advanced gaseous combustion systems is described in this fifth quarterly report. CFD Research Corporation (CFDRC) is developing the LES module within the parallel, unstructured solver included in the commercial CFD-ACE+ software. In this quarter, in-situ adaptive tabulation (ISAT) for efficient chemical rate storage and retrieval was further tested in the LES code. The use of multiple trees and periodic tree dumping was investigated. Implementation of the Linear Eddy Model (LEM) for subgrid chemistry was finished for serial applications. Validation of the model on a backstep reacting case was performed. Initial calculations of the SimVal experiment were performed for various barrel lengths, equivalence ratio, combustor shapes, and turbulence models. The effects of these variables on combustion instability was studied. Georgia Tech continues the effort to parameterize the LEM over composition space so that a neural net can be used efficiently in the combustion LES code. Next quarter, the 2nd consortium meeting will be held at CFDRC. LES software development and testing will continue. Alpha testing of the code will be performed on cases of interest to the industrial consortium. Optimization of subgrid models will be pursued, particularly with the ISAT approach. Also next quarter, the demonstration of the neural net approach, for chemical kinetics speed-up in CFD-ACE+, should be accomplished.

Steve Cannon; Baifang Zuo; Virgil Adumitroaie; Keith McDaniel; Cliff Smith

2002-01-01T23:59:59.000Z

142

Towards the understanding of cyclic variability in a spark ignited engine using multi-cycle LES  

SciTech Connect

Large-Eddy Simulation (LES) has been used to analyze the occurrence and the causes of cycle-to-cycle combustion variations in a spark ignited four-valve single cylinder engine fueled with a homogeneous propane-air mixture. The combustion modeling combines an Eulerian model derived from the RANS AKTIM model that mimics the spark ignition and the Extended Coherent Flame Model (ECFM-LES) that describes the flame propagation. The motion of piston and valves is accounted for using an Arbitrary Eulerian Lagrangian (ALE) technique with body-fitted meshes. The computation covers nine consecutive complete four-stroke cycles following an initialization cycle. The obtained LES results are compared with experimental measurements. Although the number of computed cycles is fairly low, LES is shown to be able to reproduce both quantitatively and qualitatively the cyclic variability observed experimentally. The investigation of the possible causes of variability illustrates the unprecedented possibility LES offers for understanding cycle-to-cycle variations. (author)

Vermorel, O.; Richard, S.; Colin, O.; Angelberger, C.; Benkenida, A. [IFP, 1 and 4 Avenue de Bois-Preau, 92852 Rueil-Malmaison Cedex (France); Veynante, D. [EM2C, CNRS and Ecole Centrale Paris, Grande Voie des Vignes, 92295 Chatenay-Malabry (France)

2009-08-15T23:59:59.000Z

143

Numerical simulations of industrial-scale combustion chamber - LES versus RANS  

Science Journals Connector (OSTI)

In this work we focus on the simulation of the process of biomass syngas combustion in the industrial combustion chamber directly linked with gasification chamber, where this gas is continuously producing from the biomass. Conflicting demands from the engineers to have rapid results and hints how to ensure the best conditions for combustion of this particular fuel and to lower the emission of pollutants, with simultaneously deep view inside the process and its stability motivates us to use both the RANS and LES techniques of turbulence modelling, compare it and take their advantages. We designed and performed series of 3D numerical simulations of both cold flow and combustion in complex geometry of industrial burner. It seems to us that the proper approach for modelling of biomass syngas combustion is steady flamelets model. Simulations performed with RANS closure are used as the initialisation of LES models, but their main goal is to predict the long-time oscillation of pressure and temperature observed in the working combustion chamber. On the other hand the main goal of the simulations with LES closure is to predict the proper level of short-time behaviour of the flame and local phenomena.

Kamil Kwiatkowski; Daniel Jasi?ski; Konrad Bajer

2011-01-01T23:59:59.000Z

144

Nek5000 Ready to Use after Simulations of Important Pipe Flow Benchmark |  

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

Nek5000 Ready to Use after Simulations of Important Pipe Flow Nek5000 Ready to Use after Simulations of Important Pipe Flow Benchmark Nek5000 Ready to Use after Simulations of Important Pipe Flow Benchmark January 29, 2013 - 1:42pm Addthis Velocity magnitude in MATiS-H spacer grid with swirl-type vanes. Velocity magnitude in MATiS-H spacer grid with swirl-type vanes. As part of the on-going Nek5000 validation efforts, a series of large eddy simulations (LES) have been performed for thermal stratification in a pipe. Results were in good agreement with the experiment and the simulation data has provided insight into the physics of the flow. An additional series of simulations of the OECD-NEA MATiS-H benchmark has also been completed using intermediate- fidelity modeling approaches, such as k-epsilon, k-omega shear stress transport, and ID detached eddy simulation, as well as one

145

CgWind: A high-order accurate simulation tool for wind turbines and wind farms  

SciTech Connect

CgWind is a high-fidelity large eddy simulation (LES) tool designed to meet the modeling needs of wind turbine and wind park engineers. This tool combines several advanced computational technologies in order to model accurately the complex and dynamic nature of wind energy applications. The composite grid approach provides high-quality structured grids for the efficient implementation of high-order accurate discretizations of the incompressible Navier-Stokes equations. Composite grids also provide a natural mechanism for modeling bodies in relative motion and complex geometry. Advanced algorithms such as matrix-free multigrid, compact discretizations and approximate factorization will allow CgWind to perform highly resolved calculations efficiently on a wide class of computing resources. Also in development are nonlinear LES subgrid-scale models required to simulate the many interacting scales present in large wind turbine applications. This paper outlines our approach, the current status of CgWind and future development plans.

Chand, K K; Henshaw, W D; Lundquist, K A; Singer, M A

2010-02-22T23:59:59.000Z

146

A Large-Eddy Simulation Study of the Influence of Subsidence on the Stably Stratified Atmospheric Boundary Layer  

E-Print Network (OSTI)

temperature, wind speed, vertical heat and momentum ?uxes,ABL is vertical wind shear, with the wind speed at the

Mirocha, Jeffrey D.; Kosovi?, Branko

2010-01-01T23:59:59.000Z

147

Direct and Large-Eddy Simulation of Turbulent Flows on Composite Multi-Resolution Grids by the Lattice Boltzmann  

E-Print Network (OSTI)

by the Lattice Boltzmann Method Hatem Touil,1 Denis Ricot,2 and Emmanuel L´ev^eque1 1 Laboratoire de Physique de, the lattice Boltzmann method, originally designed for uniform structured grids, needs to be extended. The lattice Boltzmann scheme relies on the standard D3Q19 lattice in a cell-vertex representation, and uses

Paris-Sud XI, Université de

148

A Large-Eddy Simulation Study of the Influence of Subsidence on the Stably Stratified Atmospheric Boundary Layer  

E-Print Network (OSTI)

snow/ice pack interior, which constrains surface cooling.snow/ice pack. They suggest that the strong cooling of theice pack. During clear-sky conditions, strong radiative cooling

Mirocha, Jeffrey D.; Kosovi?, Branko

2010-01-01T23:59:59.000Z

149

The Local Structure of Atmospheric Turbulence and Its Effect on the Smagorinsky Model for Large Eddy Simulation  

Science Journals Connector (OSTI)

Phenomena such as large-scale shear, buoyancy, and the proximity to the ground surface significantly affect interactions among scales in atmospheric boundary layer turbulent flows. Hence, these phenomena impact parameters that enter subgrid-scale ...

Marcelo Chamecki; Charles Meneveau; Marc B. Parlange

2007-06-01T23:59:59.000Z

150

Final Report on the “New Directions in the Variational Multiscale Formulation of Large Eddy Simulation of Turbulence”  

SciTech Connect

In the report we present a summary of the new models and algorithms developed by the PI and the students supported by this grant. These developments are described in detail in ten peer-reviewed journal articles that acknowledge support from this grant.

Oberai, Assad A [Rensselaer Polytechnic Instistute

2013-07-16T23:59:59.000Z

151

Large-eddy simulation of the plume generated by the fire at the Buncefield oil depot in December 2005  

Science Journals Connector (OSTI)

...generated by the Chisholm forest fire in Canada in 2001. It is possible that latent heating...means that very little of the incoming solar radiation is reflected. This is consistent...radiation in the atmosphere, short-wave (solar) and long-wave (terrestrial) radiation...

2009-01-01T23:59:59.000Z

152

Under consideration for publication in J. Fluid Mech. 1 Large-eddy simulation of a bi-periodic  

E-Print Network (OSTI)

the hot products. However, the application of transpiration-based technology to gas turbines is impossible In gas turbines, the solid parts such as the turbine blades or the liner of the combustion chamber 2600. The numerical results for this fully developed, bi-periodic turbulent flow with effusion

Nicoud, Franck

153

Large eddy simulation/conditional moment closure modeling of swirl-stabilized non-premixed flames with local extinction  

E-Print Network (OSTI)

, L. Vervisch, P. Domingo, Combust. Flame 146 (2006), 635-648. 28. S. Navarro-Martinez, A. Kronenburg, F.D. Mare, Flow Turbul. Combust. 75 (2005), 245-274. 29. A. Triantafyllidis, E. Mastorakos, Flow Turbul. Combust. 84 (2010), 481-512. 30. M...

Zhang, Huangwei; Garmory, Andrew; Cavaliere, Davide E.; Mastorakos, Epaminondas

2014-06-25T23:59:59.000Z

154

Turbulence Characteristics in Offshore Wind Farms from LES Simulations of Lillgrund Wind Farm  

Science Journals Connector (OSTI)

Abstract The effect of wind turbine wakes in large offshore wind energy arrays can be a substantial factor in affecting the performance of turbines inside the array. Turbulent mixing plays a key role in the wake recovery, having a significant effect on the length over which the wake is strong enough to affect the performance of other turbines significantly. We highlight how turbulence affects wind turbine wakes using results from LES simulations of Lillgrund offshore wind farm in the context of SCADA data selected to mirror the wind conditions simulated. The analysis here concentrated on temporal spectra of wind velocities measured by the turbine's nacelle anemometer and calculated at the turbine locations in the computational model. The effect of the wind turbine rotor on the downstream flow is quantified by analysing the change in spectral features of turbines within the wind farm compared to turbines at the side of the farm exposed to the wind.

Wolf-Gerrit Früh; Angus C.W. Creech; A. Eoghan Maguire

2014-01-01T23:59:59.000Z

155

LES SOFTWARE FOR THE DESIGN OF LOW EMISSION COMBUSTION SYSTEMS FOR VISION 21 PLANTS  

SciTech Connect

Further development of a combustion Large Eddy Simulation (LES) code for the design of advanced gaseous combustion systems is described in this fourth quarterly report. CFD Research Corporation (CFDRC) is developing the LES module within the parallel, unstructured solver included in the commercial CFD-ACE+ software. In this quarter, in-situ adaptive tabulation (ISAT) for efficient chemical rate storage and retrieval was further tested in the LES code. A more efficient PK binary tree data structure is being developed and implemented to replace the original BSP-tree structure. Implementation of the Linear Eddy Model (LEM) for subgrid chemistry has also started. In addition, Georgia Tech has shown that a chemical neural net (1-step chemistry) trained at certain turbulent conditions can be used at different turbulent conditions without expensive chemical kinetic integrations. Initial evaluations of the code accuracy have also been carried out. The evaluations cases included the unstable DOE-NETL combustor and a lid-driven cavity. Next quarter, the ISAT algorithm for efficient chemistry will be tested for the unstable DOE-NETL combustor. Initial flame calculations, with the LEM subgrid chemistry model are planned. Also, demonstration of the neural net approach, for chemical kinetics speed-up, should be demonstrated for more advanced chemistry (8-species and 19-species mechanisms).

Steve Cannon; Virgil Adumitroaie; Keith McDaniel; Cliff Smith

2001-10-01T23:59:59.000Z

156

This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 8579  

E-Print Network (OSTI)

-Dominik and Poinsot, Thierry Acoustic and Large Eddy Simulation studies of azimuthal modes in annular combustion-oatao@listes.diff.inp-toulouse.fr #12;Acoustic and Large Eddy Simulation studies of azimuthal modes in annular combustion chambers. P) Large Eddy Simulation (LES) methods and (2) acoustic solvers. These strong com- bustion instabilities

Mailhes, Corinne

157

Simulation of Turbulent Flow Inside and Above Wind Farms: Model Validation and Layout Effects  

Science Journals Connector (OSTI)

A recently-developed large-eddy simulation framework is validated and used to investigate turbulent flow within and above wind farms under neutral conditions. Two different layouts are considered, consisting of t...

Yu-Ting Wu; Fernando Porté-Agel

2013-02-01T23:59:59.000Z

158

Dynamical and Microphysical Evolution during Mixed-Phase Cloud Glaciation Simulated Using the Bulk Adaptive Habit Prediction Model  

Science Journals Connector (OSTI)

A bulk microphysics scheme predicting ice particle habit evolution has been implemented in the Weather Research and Forecasting Model. Large-eddy simulations are analyzed to study the effects of ice habit and number concentration on the bulk ice ...

Kara J. Sulia; Hugh Morrison; Jerry Y. Harrington

2014-11-01T23:59:59.000Z

159

Inflow turbulence generation for eddy-resolving simulations of turbomachinery flows  

E-Print Network (OSTI)

A simple variant of recycling and rescaling method to generate inflow turbulence using unstructured grid CFD codes is presented. The method has been validated on large eddy simulation of spatially developing flat plate turbulent boundary layer. The proposed rescaling algorithm is based on the momentum thickness which is more robust and essentially obviates the need of finding the edge of the turbulent boundary layer in unstructured grid codes. Extension of this algorithm to hybrid RANS/LES type of approaches and for wall-bounded turbomachinery flows is also discussed. Results from annular diffuser with different inflow boundary layer characteristics is presented as an example application to show the utility of such an algorithm.

Arolla, Sunil K

2014-01-01T23:59:59.000Z

160

LES SOFTWARE FOR THE DESIGN OF LOW EMISSION COMBUSTION SYSTEMS FOR VISION 21 PLANTS  

SciTech Connect

Vision 21 combustion systems will require innovative low emission designs and low development costs if Vision 21 goals are to be realized. In this three-year project, an advanced computational software tool will be developed for the design of low emission combustion systems required for Vision 21 clean energy plants. The combustion Large Eddy Simulation (LES) software will be able to accurately simulate the highly transient nature of gaseous-fueled turbulent combustion so that innovative concepts can be assessed and developed with fewer high-cost experimental tests. During the first year, the project included the development and implementation of improved chemistry (reduced GRI mechanism), subgrid turbulence (localized dynamic), and subgrid combustion-turbulence interaction (Linear Eddy) models into the CFDACE+ code. University expertise (Georgia Tech and UC Berkeley) was utilized to help develop and implement these advanced submodels into the unstructured, parallel CFD flow solver, CFD-ACE+. Efficient numerical algorithms that rely on in situ look-up tables or artificial neural networks were implemented for chemistry calculations. In the second year, the combustion LES software was evaluated and validated using experimental data from lab-scale and industrial test configurations. This code testing (i.e., alpha testing) was performed by CFD Research Corporation's engineers. During the third year, six industrial and academic partners used the combustion LES code and exercised it on problems of their choice (i.e., beta testing). Final feedback and optimizations were then be implemented in the final release version of the combustion LES software that will be licensed to the general public. An additional one-year task was added for the fourth year of this program entitled, ''LES Simulations of SIMVAL Results''. For this task, CFDRC performed LES calculations of selected SIMVAL cases, and compared predictions with measurements. In addition to comparisons with NO{sub x} and CO exit measurements, comparisons were made to measured pressure oscillations. Possible gaps in the data sets were identified, as well as potential areas of improvement for combustion and turbulence models. Work in this seventeenth quarter (October-December 2004) consisted of writing the draft final report for review by DOE. The report was delivered to DOE in January, 2005.

Clifford E. Smith

2005-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "large-eddy simulation les" 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

Comprehensive Approaches to Multiphase Flows in Geophysics - Application to nonisothermal, nonhomogenous, unsteady, large-scale, turbulent dusty clouds I. Hydrodynamic and Thermodynamic RANS and LES Models  

SciTech Connect

The objective of this manuscript is to fully derive a geophysical multiphase model able to ''accommodate'' different multiphase turbulence approaches; viz., the Reynolds Averaged Navier-Stokes (RANS), the Large Eddy Simulation (LES), or hybrid RANSLES. This manuscript is the first part of a larger geophysical multiphase project--lead by LANL--that aims to develop comprehensive modeling tools for large-scale, atmospheric, transient-buoyancy dusty jets and plume (e.g., plinian clouds, nuclear ''mushrooms'', ''supercell'' forest fire plumes) and for boundary-dominated geophysical multiphase gravity currents (e.g., dusty surges, diluted pyroclastic flows, dusty gravity currents in street canyons). LES is a partially deterministic approach constructed on either a spatial- or a temporal-separation between the large and small scales of the flow, whereas RANS is an entirely probabilistic approach constructed on a statistical separation between an ensemble-averaged mean and higher-order statistical moments (the so-called ''fluctuating parts''). Within this specific multiphase context, both turbulence approaches are built up upon the same phasic binary-valued ''function of presence''. This function of presence formally describes the occurrence--or not--of any phase at a given position and time and, therefore, allows to derive the same basic multiphase Navier-Stokes model for either the RANS or the LES frameworks. The only differences between these turbulence frameworks are the closures for the various ''turbulence'' terms involving the unknown variables from the fluctuating (RANS) or from the subgrid (LES) parts. Even though the hydrodynamic and thermodynamic models for RANS and LES have the same set of Partial Differential Equations, the physical interpretations of these PDEs cannot be the same, i.e., RANS models an averaged field, while LES simulates a filtered field. In this manuscript, we also demonstrate that this multiphase model fully fulfills the second law of thermodynamics and fulfills the necessary requirements for a well-posed initial-value problem. In the next manuscripts, we will further develop specific closures for multiphase RANS, LES, and hybrid-LES.

S. Dartevelle

2005-09-05T23:59:59.000Z

162

Large-eddy simulations of structure effects of an upstream elbow main pipe on hot and cold fluids mixing in a vertical tee junction  

E-Print Network (OSTI)

power plant. Thermal fatigue is an important degradation mechanism for the life time assessment in e.g. nuclear power plants. In the present work, the mixing of a hot and a cold fluid stream place both in nuclear plants involving light water and sodium cooled reactors due to thermal fatigue

Attinger, Daniel

163

Localized dynamic subgrid closure for simulation of magnetohydrodynamic turbulence  

SciTech Connect

A local dynamic kinetic energy model (LDKM) for large-eddy simulation (LES) of magnetohydrodynamic (MHD) turbulence is proposed. The proposed MHD turbulence model evaluates all model coefficients locally and dynamically without any ad hoc averaging. This model also does not assume low magnetic Reynolds numbers. The turbulent residual-helicity effect ({alpha}-effect) appearing in the magnetic induction equation is successfully modeled. For validation, high-Re decaying isotropic decay turbulence with and without a mean magnetic field are studied using LES. The effect of rotation is also studied. For the case without rotation, it is observed that the energy spectrum follows a k{sup -5/3} law. For the case with rotation, it is shown that two mechanisms, phase scrambling due to frame rotation and Joule dissipation, are competing, and two distinct regimes with respect to rotation rate are observed. There is a critical rotation rate at which the energy decays most in MHD turbulence. It is also shown that this MHD-LDKM model is applicable to wide variety of high/low magnetic Reynolds number applications.

Miki, Kenji; Menon, Suresh [Georgia Institute of Technology, School of Aerospace Engineering, Atlanta, Georgia 30332-0150 (United States)

2008-07-15T23:59:59.000Z

164

AIAA JOURNAL Vol. 44, No. 4, April 2006  

E-Print Network (OSTI)

AIAA JOURNAL Vol. 44, No. 4, April 2006 Large-Eddy Simulation and Acoustic Analysis of a Swirled is successfully captured by reactive large-eddy simulation (LES) and analyzed by using a global acoustic energy criterion) is balanced by the acoustic fluxes at the boundaries when reaching the limit cycle. Additionally

165

PANS method of turbulence: simulation of high and low Reynolds number flows past a circular cylinder  

E-Print Network (OSTI)

cylinder are performed at ReD 140,000 and ReD 3900 using the PANS model. The high Reynolds number PANS results are compared with experimental results from Cantwell and Coles, Large Eddy Simulation results from Breuer, and Detached Eddy Simulation results...

Lakshmipathy, Sunil

2006-04-12T23:59:59.000Z

166

Estimating dependence of the turbulent length scales on model resolution based on a priori analysis  

Science Journals Connector (OSTI)

The Reynolds Averaged Navier-Stokes Simulation (RANS) and the Large-Eddy Simulation (LES) have been widely used to parameterize unresolved turbulent motions for the atmospheric boundary layer. However, there is an intermediate model resolution, ...

Yuji KITAMURA

167

Scaling Laws for the Heterogeneously Heated Free Convective Boundary Layer  

Science Journals Connector (OSTI)

The heterogeneously heated free convective boundary layer (CBL) is investigated by means of dimensional analysis and results from large-eddy simulations (LES) and direct numerical simulations (DNS). The investigated physical model is a CBL that ...

Chiel C. van Heerwaarden; Juan Pedro Mellado; Alberto De Lozar

2014-11-01T23:59:59.000Z

168

Development of a genetic algorithm tracking technique for the particle image velocimetry and comparison with other tracking models  

E-Print Network (OSTI)

particles between sequential frames. The new tracking method was compared with three other existing tracking methods to evaluate their efficiency, i.e., reliability and yield. Synthetic data from a Large Eddy Simulation (LES) computational fluid dynamic...

Yoon, Churl

2012-06-07T23:59:59.000Z

169

Direct Simulations of Wind-Driven Breaking Ocean Waves with Data Assimilation  

E-Print Network (OSTI)

A formulation is developed to assimilate ocean-wave data into the Numerical Flow Analysis (NFA) code. NFA is a Cartesian-based implicit Large-Eddy Simulation (LES) code with Volume of Fluid (VOF) interface capturing. The sequential assimilation of data into NFA permits detailed analysis of ocean-wave physics with higher bandwidths than is possible using either other formulations, such as High-Order Spectral (HOS) methods, or field measurements. A framework is provided for assimilating the wavy and vortical portions of the flow. Nudging is used to assimilate wave data at low wavenumbers, and the wave data at high wavenumbers form naturally through nonlinear interactions, wave breaking, and wind forcing. Similarly, the vertical profiles of the mean vortical flow in the wind and the wind drift are nudged, and the turbulent fluctuations are allowed to form naturally. As a demonstration, the results of a HOS of a JONSWAP wave spectrum are assimilated to study short-crested seas in equilibrium with the wind. Log pr...

Dommermuth, Douglas G; Tran, Vu H; Valenciano, Miguel A

2014-01-01T23:59:59.000Z

170

Simulations of Turbulent Flows with Strong Shocks and Density Variations: Final Report  

SciTech Connect

The target of this SciDAC Science Application was to develop a new capability based on high-order and high-resolution schemes to simulate shock-turbulence interactions and multi-material mixing in planar and spherical geometries, and to study Rayleigh-Taylor and Richtmyer-Meshkov turbulent mixing. These fundamental problems have direct application in high-speed engineering flows, such as inertial confinement fusion (ICF) capsule implosions and scramjet combustion, and also in the natural occurrence of supernovae explosions. Another component of this project was the development of subgrid-scale (SGS) models for large-eddy simulations of flows involving shock-turbulence interaction and multi-material mixing, that were to be validated with the DNS databases generated during the program. The numerical codes developed are designed for massively-parallel computer architectures, ensuring good scaling performance. Their algorithms were validated by means of a sequence of benchmark problems. The original multi-stage plan for this five-year project included the following milestones: 1) refinement of numerical algorithms for application to the shock-turbulence interaction problem and multi-material mixing (years 1-2); 2) direct numerical simulations (DNS) of canonical shock-turbulence interaction (years 2-3), targeted at improving our understanding of the physics behind the combined two phenomena and also at guiding the development of SGS models; 3) large-eddy simulations (LES) of shock-turbulence interaction (years 3-5), improving SGS models based on the DNS obtained in the previous phase; 4) DNS of planar/spherical RM multi-material mixing (years 3-5), also with the two-fold objective of gaining insight into the relevant physics of this instability and aiding in devising new modeling strategies for multi-material mixing; 5) LES of planar/spherical RM mixing (years 4-5), integrating the improved SGS and multi-material models developed in stages 3 and 5. This final report is outlined as follows. Section 2 shows an assessment of numerical algorithms that are best suited for the numerical simulation of compressible flows involving turbulence and shock phenomena. Sections 3 and 4 deal with the canonical shock-turbulence interaction problem, from the DNS and LES perspectives, respectively. Section 5 considers the shock-turbulence inter-action in spherical geometry, in particular, the interaction of a converging shock with isotropic turbulence as well as the problem of the blast wave. Section 6 describes the study of shock-accelerated mixing through planar and spherical Richtmyer-Meshkov mixing as well as the shock-curtain interaction problem In section 7 we acknowledge the different interactions between Stanford and other institutions participating in this SciDAC project, as well as several external collaborations made possible through it. Section 8 presents a list of publications and presentations that have been generated during the course of this SciDAC project. Finally, section 9 concludes this report with the list of personnel at Stanford University funded by this SciDAC project.

Sanjiva Lele

2012-10-01T23:59:59.000Z

171

LES of swirl-stabilised pulverised coal combustion in IFRF furnace No. 1  

Science Journals Connector (OSTI)

Abstract Swirl-stabilised turbulent flow and pulverised coal combustion in the semi-industrial (2.5 MW) IFRF furnace No. 1 are for the first time simulated by means of large eddy simulation and compared to results from the experimental campaign and RANS predictions by Weber et al. (1992). The large eddy simulation uses the Euler–Lagrange framework for two-phase flows and relatively simple sub-models for the particle heat-up, devolatilisation, char combustion and radiation governing the pulverised coal combustion process are employed. The simulations yield improved predictions of the velocity statistics in the quarl region and result in a favourable agreement of the mean species profiles along the burner centreline compared with the measurements, while some temperature underprediction can be observed. Furthermore, the transient Euler–Lagrange approach allows for a cross-comparison of the velocity and scalar statistics between the two phases and the comparison of the mean axial velocity and temperature shows the two phases to be near thermal and kinetic equilibrium along the burner axis. Individual particle time histories, which are crucial for the coal combustion sub-processes and overall flame stabilisation, are analysed. It is found that there is a lack of oxygen in the inner quarl region leading to a decreased volatile burning rate, which could however, be related to the simplified EBU turbulence–chemistry interaction model.

G. Olenik; O.T. Stein; A. Kronenburg

2014-01-01T23:59:59.000Z

172

LES SOFTWARE FOR THE DESIGN OF LOW EMISSION COMBUSTION SYSTEMS FOR VISION 21 PLANTS  

SciTech Connect

In this project, an advanced computational software tool will be developed for the design of low emission combustion systems required for Vision 21 clean energy plants. This computational tool will utilize Large Eddy Simulation (LES) methods to predict the highly transient nature of turbulent combustion. The time-accurate software will capture large scale transient motion, while the small scale motion will be modeled using advanced subgrid turbulence and chemistry closures. This three-year project is composed of: Year 1--model development/implementation, Year 2--software alpha validation, and Year 3--technology transfer of software to industry including beta testing. In this first year of the project, subgrid models for turbulence and combustion are being developed through university research (Suresh Menon-Georgia Tech and J.-Y. Chen- UC Berkeley) and implemented into a leading combustion CFD code, CFD-ACE+. The commercially available CFDACE+ software utilizes unstructured , parallel architecture and 2nd-order spatial and temporal numerics. To date, the localized dynamic turbulence model and reduced chemistry models (up to 19 species) for natural gas, propane, hydrogen, syngas, and methanol have been incorporated. The Linear Eddy Model (LEM) for subgrid combustion-turbulence interaction has been developed and implementation into CFD-ACE+ has started. Ways of reducing run-time for complex stiff reactions is being studied, including the use of in situ tabulation and neural nets. Initial validation cases have been performed. CFDRC has also completed the integration of a 64 PC cluster to get highly scalable computing power needed to perform the LES calculations ({approx} 2 million cells) in several days. During the second year, further testing and validation of the LES software will be performed. Researchers at DOE-NETL are working with CFDRC to provide well-characterized high-pressure test data for model validation purposes. To insure practical, usable software is developed, a consortium of gas turbine and industrial burner manufacturers has been established to guide and direct the software development/validation effort. The consortium members include Siemens- Westinghouse, GE Power Systems, Pratt & Whitney, Rolls-Royce, Honeywell, Solar, Coen, McDermott, Vapor Power, Woodward FST, Parker Hannifin, John Zink, RamGen Power, Virginia Tech, DOE-NETL, Air Force Research Laboratory, DOE-ANL, and NASA GRC. Annual consortium meetings are being held in Huntsville, with the 2nd meeting scheduled for January 31-February 1, 2002. 2 Benefits of the program will include the ability to assess complex combustion challenges such as combustion instability, lean blowout, flashback, emissions and the effect of fuel type on performance. The software will greatly reduce development costs and the time cycle of combustor development. And perhaps the greatest benefit will be that the software will stimulate new, creative ideas to solve the combustion challenges of the Vision 21 plant.

Cannon, Steven M.; Adumitroaie, Virgil; McDaniel, Keith S.; Smith, Clifford E.

2001-11-06T23:59:59.000Z

173

ARM - Publications: Science Team Meeting Documents  

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

Radar Observations of Large-Eddy Circulations and Turbulence in Boundary Radar Observations of Large-Eddy Circulations and Turbulence in Boundary Layer Clouds Albrecht, B.A. and Kollias, P., Umiversity of Miami Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting With the development and application of Doppler short wavelength radars, there has been an increased capability for explicitly resolving the vertical structure of boundary layer cloud circulations. Further, Doppler mm-wavelength radars used in a vertically pointing mode can provide information on the turbulence structure within the cloud volume sampled by the radar. Since these radar large eddy observations (LEO) are of the same resolution as that of Large Eddy Simulation models, they provide a means for explicitly evaluating LES (LEO for LES). Further the radar observations

174

THE BURGERS PROGRAM FOR FLUID DYNAMICS THE MINTA MARTIN FUND  

E-Print Network (OSTI)

In an effort to make large eddy simulation of scramjet combustors of engineering interest computationally more

Bernstein, Joseph B.

175

Performance of an Eddy Diffusivity–Mass Flux Scheme for Shallow Cumulus Boundary Layers  

Science Journals Connector (OSTI)

Comparisons between single-column (SCM) simulations with the total energy–mass flux boundary layer scheme (TEMF) and large-eddy simulations (LES) are shown for four cases from the Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS) ...

Wayne M. Angevine; Hongli Jiang; Thorsten Mauritsen

2010-07-01T23:59:59.000Z

176

Les principes du DSM  

Science Journals Connector (OSTI)

Résumé Cet article analyse dans une perspective historique les principes qui ont façonné les éditions successives du DSM, la classification américaine des troubles mentaux. Les classifications des troubles mentaux ne sont pas des constructions statiques. Elles se transforment constamment en fonction de contraintes scientifiques et sociétales, évolutives et parfois contradictoires. Abstract This paper offers a historical analysis of the principles that determined the successive editions of the DSM. Classifications of mental disorders are never definitive. They evolve constantly, under the influence of shifting scientific and societal determinants.

Marc-Antoine Crocq

2014-01-01T23:59:59.000Z

177

Center for Turbulence Research Proceedings of the Summer Program 2012  

E-Print Network (OSTI)

detailed chemistry into the modeling loop. Indeed, oversim- plified descriptions of the chemical reactions responses from canonical combustion problems; typically, the chemical response of one-dimensional laminar A strategy to bridge the gap between hydrocarbon combustion detailed chemistry and Large Eddy Simulation (LES

Wang, Wei

178

This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 8566  

E-Print Network (OSTI)

turbines due to increasingly stringent regulations and the need to tackle rising fuel prices. This drive in performing Large Eddy Simulation (LES) of real combustors is estimating the adequate grid, the effects and for the real operating parameters of the engine. Of course, classical Reynolds Averaged Navier Stokes methods

Boyer, Edmond

179

Les Cahiers du GERAD  

E-Print Network (OSTI)

research papers published in the series Les Cahiers du GERAD. ... The converse result, that is the existence of a decomposition as a path and ..... a white paper algorithm thus showing that even tight complexities must be interpreted with care. ... As final remarks, we think the linear programming proof of the decomposition ...

2014-10-08T23:59:59.000Z

180

Albany, OR * Anchorage, AK * Morgantown, WV * Pittsburgh, PA * Sugar Land, TX  

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

Large Eddy Simulation Modeling of Large Eddy Simulation Modeling of Flashback and Flame Stabilization in Hydrogen-Rich Gas Turbines using a Hierarchical Validation Approach- University of Texas at Austin Background The focus of this project is the development of advanced large eddy simulation (LES)-based combustion modeling tools that can be used to design low emissions combustors burning high hydrogen content fuels. The University of Texas at Austin (UT) will develop models for two key topics: (1) flame stabilization, lift- off, and blowout when fuel-containing jets are introduced into a crossflow at high pressure, and (2) flashback dynamics of lean premixed flames with detailed description of flame propagation in turbulent core and near-wall flows. The jet- in-crossflow (JICF) configuration is widely used for rapid mixing of reactants

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181

On the simulation of shock-driven material mixing in high-Re flows (u)  

SciTech Connect

Implicit large eddy simulation proposes to effectively rely on the use of subgrid modeling and filtering provided implicitly by physics capturing numerics. Extensive work has demonstrated that predictive simulations of turbulent velocity fields are possible using a class of high resolution, non-oscillatory finite-volume (NFV) numerical algorithms. Truncation terms associated with NFV methods implicitly provide subgrid models capable of emulating the physical dynamics of the unresolved turbulent velocity fluctuations by themselves. The extension of the approach to the substantially more difficult problem of under-resolved material mixing by an under-resolved velocity field has not yet been investigated numerically, nor are there any theories as to when the methodology may be expected to be successful. Progress in addressing these issues in studies of shock-driven scalar mixing driven by Ritchmyer-Meshkov instabilities will be reported in the context of ongoing simulations of shock-tube laboratory experiments.

Grinstein, Fernando F [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

182

LES TRAITS PERSANS SUR LES SCIENCES INDIENNES : MDECINE, ZOOLOGIE, ALCHIMIE  

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LES TRAIT�S PERSANS SUR LES SCIENCES INDIENNES : M�DECINE, ZOOLOGIE, ALCHIMIE Fabrizio Speziale persan n'a encore jamais fait l'objet d'une étude exhaustive. une analyse plus approfondie des sources montre qu'il serait en effet injustifié de définir le corpus de la littérature médicale indo-persane

Paris-Sud XI, Université de

183

Direct Numerical Simulations in Engine-like Geometries | Argonne...  

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

Location: Argonne National Laboratory Speaker(s): Martin Schmitt Speaker(s) Title: ETH Zurich Engine simulations based on RANS and LES depend on the mesh resolution and...

184

PLE QUALITCERTIFI ISO 9001 LES MTIERS  

E-Print Network (OSTI)

PÃ?LE QUALITÃ?CERTIFIÃ? ISO 9001 LES MÃ?TIERS RESPONSABLE QUALITÃ? RESPONSABLE SÃ?CURITÃ? DIRECTEUR OU

Jeanjean, Louis

185

A new class of finite element variational multiscale turbulence models for incompressible magnetohydrodynamics  

E-Print Network (OSTI)

New large eddy simulation (LES) turbulence models for incompressible magnetohydrodynamics (MHD) derived from the variational multiscale (VMS) formulation for finite element simulations are introduced. The new models include the variational multiscale formulation, a residual-based eddy viscosity model, and a mixed model that combines both of these component models. Each model contains terms that are proportional to the residual of the incompressible MHD equations and is therefore numerically consistent. Moreover, each model is also dynamic, in that its effect vanishes when this residual is small. The new models are tested on the decaying MHD Taylor Green vortex at low and high Reynolds numbers. The evaluation of the models is based on comparisons with available data from direct numerical simulations (DNS) of the time evolution of energies as well as energy spectra at various discrete times. A numerical study, on a sequence of meshes, is presented that demonstrates that the large eddy simulation approaches the ...

Sondak, David; Oberai, Assad A; Pawlowski, Roger P; Cyr, Eric C; Smith, Tom M

2014-01-01T23:59:59.000Z

186

TIC et conditions de travail. Les enseignements  

E-Print Network (OSTI)

TIC et conditions de travail. Les enseignements de l'enquête COI Juin 2012 Nathalie Greenan, Sylvie TIC et conditions de travail Les enseignements de l'enquête COI NATHALIE GREENAN Centre d'études de l-2-11-128685-6 www.cee-recherche.fr #12;TIC et conditions de travail. Les enseignements de l'enquête COI R�SUM� Le

Paris-Sud XI, Université de

187

Les communauts marchandes de l'Europe du Nord dans les ports bretons au XVIIIe  

E-Print Network (OSTI)

Les communautés marchandes de l'Europe du Nord dans les ports bretons au XVIIIe siècle Pierrick Peter Voss, «Les communautés marchandes étrangères dans l'espace urbain bordelais (62075)», dans J ou moins grande fréquentation par les communautés marchandes des différents pays européens. Cet

Paris-Sud XI, Université de

188

COMMENT LES NANOTUBES DE CARBONE INTERAGISSENT AVEC LES MACROPHAGES : CE QUE NOUS DIT LA MICROFLUORESCENCE X  

E-Print Network (OSTI)

COMMENT LES NANOTUBES DE CARBONE INTERAGISSENT AVEC LES MACROPHAGES : CE QUE NOUS DIT LA. Boczkowski (INSERM). Réf. : Nano Lett. 8 (9), 2659-2663 (2008). Les nanotubes de carbone présentent des utilisée jusqu'alors pour étudier des nanotubes de carbone. Nous avons choisi d'étudier différentes sortes

Paris-Sud 11, Université de

189

Quand les TIC russissent trop bien dans les organisa-tions : le cas du courrier lectronique chez les managers  

E-Print Network (OSTI)

Quand les TIC réussissent trop bien dans les organisa- tions : le cas du courrier électronique chez dès lors comme un objet de recherche approprié pour étudier la problématique darticulation des TIC un point nodal structurant dans le portefeuille technologique des managers. Mots clefs : TIC

Paris-Sud XI, Université de

190

Burning syngas in a high swirl burner: Effects of fuel composition  

Science Journals Connector (OSTI)

Abstract Flame characteristics of swirling non-premixed H2/CO syngas fuel mixtures have been simulated using large eddy simulation and detailed chemistry. The selected combustor configuration is the TECFLAM burner which has been used for extensive experimental investigations for natural gas combustion. The large eddy simulation (LES) solves the governing equations on a structured Cartesian grid using a finite volume method, with turbulence and combustion modelling based on the localised dynamic Smagorinsky model and the steady laminar flamelet model respectively. The predictions for H2-rich and CO-rich flames show considerable differences between them for velocity and scalar fields and this demonstrates the effects of fuel variability on the flame characteristics in swirling environment. In general, the higher diffusivity of hydrogen in H2-rich fuel is largely responsible for forming a much thicker flame with a larger vortex breakdown bubble (VBB) in a swirling flame compare to the H2-lean but CO-rich syngas flames.

K.K.J. Ranga Dinesh; K.H. Luo; M.P. Kirkpatrick; W. Malalasekera

2013-01-01T23:59:59.000Z

191

A Method To Accelerate LES Explicit Solvers Using Local Time-Stepping  

E-Print Network (OSTI)

designing a gas turbine combustor are to control flame ignition and extinction as well as combustion (LES) explicit solver and successfully tested for an acoustic wave propagation. It has been finally simulations are now part of the design process of aeronautical turbine combustors. Main challenges when

Paris-Sud XI, Université de

192

Direct numerical simulation of turbulent reacting flows  

SciTech Connect

The development of turbulent combustion models that reflect some of the most important characteristics of turbulent reacting flows requires knowledge about the behavior of key quantities in well defined combustion regimes. In turbulent flames, the coupling between the turbulence and the chemistry is so strong in certain regimes that is is very difficult to isolate the role played by one individual phenomenon. Direct numerical simulation (DNS) is an extremely useful tool to study in detail the turbulence-chemistry interactions in certain well defined regimes. Globally, non-premixed flames are controlled by two limiting cases: the fast chemistry limit, where the turbulent fluctuations. In between these two limits, finite-rate chemical effects are important and the turbulence interacts strongly with the chemical processes. This regime is important because industrial burners operate in regimes in which, locally the flame undergoes extinction, or is at least in some nonequilibrium condition. Furthermore, these nonequilibrium conditions strongly influence the production of pollutants. To quantify the finite-rate chemistry effect, direct numerical simulations are performed to study the interaction between an initially laminar non-premixed flame and a three-dimensional field of homogeneous isotropic decaying turbulence. Emphasis is placed on the dynamics of extinction and on transient effects on the fine scale mixing process. Differential molecular diffusion among species is also examined with this approach, both for nonreacting and reacting situations. To address the problem of large-scale mixing and to examine the effects of mean shear, efforts are underway to perform large eddy simulations of round three-dimensional jets.

Chen, J.H. [Sandia National Laboratories, Livermore, CA (United States)

1993-12-01T23:59:59.000Z

193

Simulation of smoke plumes from large pool fires  

SciTech Connect

A large eddy simulation model of smoke plumes generated by large outdoor pool fires is presented. The plume is described in terms of steady-state convective transport by a uniform ambient wind of heated gases and particulate matter introduced into a stably stratified atmosphere by a continuously burning fire. The Navier-Stokes equations in the Boussinesq approximation are solved numerically with a constant eddy viscosity representing dissipation on length scales below the resolution limits of the calculation. The effective Reynolds number is high enough to permit direct simulation of the large scale mixing over two to three orders of magnitude in length scale. Particulate matter, or any nonreacting combustion product, is representing by Lagrangian particles that are advected by the fire-induced flow field. Background atmospheric motion is described in terms of the angular fluctuation of the prevailing wind and represented by random perturbations to the mean particle paths. Sample computations are presented and compared with plumes generated by large crude oil pool fires. Also presented is an assessment of the potential environmental hazard posed by burning marine oil spills.

Baum, H.R.; McGrattan, K.B.; Rehm, R.G. [National Inst. of Standards and Technology, Gaithersburg, MD (United States)

1994-12-31T23:59:59.000Z

194

Etudes spectroscopiques du dopage dans les matériaux II-VI pour les détecteurs infrarouge et les cellules photovoltaïques.  

E-Print Network (OSTI)

??Ce travail de thèse présente les caractéristiques optiques et électriques de dopants dans des couches de CdHgTe, CdZnTe et CdS. Ces 3 matériaux II-VI ont… (more)

Gemain, Frédérique

2012-01-01T23:59:59.000Z

195

RELATIONS ENTRE LES PROPRITS OPTIQUES ET DILECTRIQUES POLARISATION IONIQUE DANS LES SOLIDES (1)  

E-Print Network (OSTI)

. 2014 Dans la première partie de ce travail, on a reconnu pour les halogé- nures alcalins une variation

Boyer, Edmond

196

HACK Patrice Les coulisses des assistances tlphoniques  

E-Print Network (OSTI)

HACK Patrice 1 ________________________________________________________________ Les coulisses des Criminologie et de Police Technique et Scientifique LXV (2012) 110" #12;HACK Patrice 2 1 ­ Données et méthode

Paris-Sud XI, Université de

197

Large-Eddy Observation of Post-Cold-Frontal Continental Stratocumulus  

E-Print Network (OSTI)

More studies on the dynamics of marine stratus and stratocumulus clouds have been performed than comparable studies on continental stratocumulus. Therefore, to increase the number of observations of continental stratocumulus ...

Mechem, David B.; Kogan, Yefim L.; Schultz, David M.

2010-10-01T23:59:59.000Z

198

LES Simulations of Turbulent Combustion in a Type Ia Supernovae  

E-Print Network (OSTI)

to be thermonuclear explosions of white dwarfs. SNIa are important sources of energy and chemical elements deposited of the burning are all determined by the speed of thermonuclear burning [27]. The problem of turbulent combustion. The mechanism and the speed of thermonuclear burning in SNIa remain an unsolved theoretical problem. A recent

New York at Stoney Brook, State University of

199

Using simulation of accidents to assess resilience capacities of organizations  

E-Print Network (OSTI)

and analysis of such simulations (toxic leak in a refinery, fire in a road tunnel, terrorist attack Symposium on Resilience Engineering, Juan-les-Pins : France (2006)" #12;situation. Another limitation lies

Boyer, Edmond

200

Les problmes dans les programmes depuis la contre rforme en France Sylvie COPPE  

E-Print Network (OSTI)

, researching conjectures, searching for information, constructing models, debating with peers, and forming liens on peut faire avec la démarche d'investigation, plus récemment introduite. Notons que le rapport exercices de réinvestissement proches du savoir enseigné, mettre les mathématiques en lien avec les autres

Paris-Sud XI, Université de

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While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


201

LES BIG DATA ET LA RELATION CLIENT Quand les traces numriques organisent l'change marchand  

E-Print Network (OSTI)

LES BIG DATA ET LA RELATION CLIENT Quand les traces numériques organisent l'échange marchand Auteur traces numériques organisent l'échange marchand Résumé : Avec le mouvement de digitalisation du commerce marchands font des comportements des consommateurs. Ces traces numériques doivent donc permettre aux

Paris-Sud XI, Université de

202

Les migrants roms dans les villes franaises et italiennes : mobilits, rgulations et marginalits  

E-Print Network (OSTI)

Les migrants roms dans les villes fran�aises et italiennes : mobilit�s, r�gulations et marginalit�s Publi� dans G�ocarrefour vol. 86, n� 1, � Roms migrants en ville : pratiques et politiques en Italie et.legros@univ-tours.fr Tommaso Vitale SciencesPo (CEE) Urba-Rom 72 boulevard de la Villette, 75019 Paris tommaso

Boyer, Edmond

203

Les dispositifs de visibilisation sur les scnes marchandes Le cas des chanes de tlvision franaises  

E-Print Network (OSTI)

1 Les dispositifs de visibilisation sur les scènes marchandes Le cas des chaînes de télévision marchandes. Il montre que la présence d'acteurs collectifs sur ces scènes ne va pas de soi. Celle-ci est visibilisation sur les scènes marchandes. Le cas des chaînes de télévision françaises, Réseaux (116), p. 257

Paris-Sud XI, Université de

204

Paysage et Landschaft : incomprhensions et malentendus entre les gographes allemands et franais dans les annes Trente.  

E-Print Network (OSTI)

géographie sont organisés dans le cadre de l'Union géographique internationale (UGI), organisation encore pérenne et qui regroupe les géographes à l'échelle mondiale2 . L'UGI est créée à Bruxelles le 27 juillet. A la base de l'UGI se trouvent les comités nationaux représentant les divers Etats adhérents, qui se

Paris-Sud XI, Université de

205

Les dérivés organiques du fluor d’intérêt pharmacologique  

Science Journals Connector (OSTI)

Les composés organiques du fluor ont fait leur apparition en chimie il y a exactement 125 ans, avec la description faite par les chimistes français Dumas et Peligot, en 1835, d’une méthode de préparation du fluor...

N. P. Buu-Hoï

1961-01-01T23:59:59.000Z

206

La chane de l'esclavage dans les Lettres persanes  

E-Print Network (OSTI)

La chaîne de l'esclavage dans les Lettres persanes Pour ma mère Avant même d'être traité comme des Lettres persanes (1721). Les rapports de domination entre les différents protagonistes, mais aussi est très rare dans les Lettres persanes (on trouve en revanche plus fréquemment servitude, associé à

Paris-Sud XI, Université de

207

Sandia National Laboratories: Transportation Energy  

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

Facilities, News, News & Events, Research & Capabilities, Systems Analysis, Transportation Energy By combining advanced theory and high-fidelity large eddy simulation,...

208

ARM - Data Announcements Article  

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

neutral interface for comparison in fine detail of high-resolution large eddy simulation model output with representative observations through radar Doppler spectra forward...

209

ARM - Publications: Science Team Meeting Documents  

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

statistical properties of several cumulus cloud scenes created by a large eddy simulation model. Progressively greater degrees of tilt and stretching were imposed on these...

210

ARM - Publications: Science Team Meeting Documents  

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

measurements were based on four-dimensional cloud fields produced by a large eddy simulation model. In particular, we demonstrated that 15-minute averages of frequently sampled...

211

Les risques sismiques Mrida (Venezuela). Pour une association des communauts la prvention de catastrophe dans les  

E-Print Network (OSTI)

Les risques sismiques à Mérida (Venezuela). Pour une association des communautés à la prévention de louest) et de Trujillo (à lest) sont les trois états andins du Venezuela. Ils occupent le tracé de la cordillère andine du Venezuela qui se dégrade au nord-est dans létat de Lara en une transition montagneuse

Paris-Sud XI, Université de

212

Les TIC dans les TPE : un investissement sous contraintes socio-conomiques et surtout individuelles.  

E-Print Network (OSTI)

Les TIC dans les TPE : un investissement sous contraintes socio- économiques et surtout'une enquête réalisée auprès des entreprises artisanales de Bretagne sur leurs relations aux TIC (enquête par le non-équipement) en objets TIC dans ces TPE. Après avoir pré- senté une typologie des ces

Paris-Sud XI, Université de

213

Monte-Carlo simulation of Ising droplets in correlated site-bond percolation  

E-Print Network (OSTI)

L-99 Monte-Carlo simulation of Ising droplets in correlated site-bond percolation D. Stauffer ordinateur la définition de Coniglio et Klein pour les gouttes du modèle Ising, sur les réseaux carré et doublé. Abstract. 2014 The definition of droplets in the Ising model by Coniglio and Klein

Paris-Sud XI, Université de

214

Computational analysis of incompressible turbulent flow in an idealised swirl combustor  

Science Journals Connector (OSTI)

Isothermal turbulent swirling flow in a water test rig, representing an idealised swirl combustor, has been investigated experimentally and numerically. The Reynolds number based on combustor inlet diameter and mean axial velocity was 4600. Two cases were investigated at two different swirl intensities. Time-averaged velocities and RMS turbulence intensities were measured by Laser Doppler Anemometer (LDA), along radial traverses at different axial stations. In the three-dimensional, transient computations, Large Eddy Simulations (LES) and URANS Reynolds Stress Models (RSM) have basically been employed as modelling strategies for turbulence. To model subgrid-scale (SGS) turbulence for LES, the models owing to Smagorinsky and Voke were used. In one of the cases, Detached Eddy Simulations (DES) were also applied. The predictions have been compared with the measurements. It has been observed that LES provides the best overall accuracy, where no significant differences between the Smagorinsky and Voke models could be discerned.

A.C. Benim; M.P. Escudier; A. Nahavandi; A.K. Nickson; K.J. Syed; F. Joos

2011-01-01T23:59:59.000Z

215

Le jugement des candidats par les entreprises lors des recrutements  

E-Print Network (OSTI)

l'explication du chômage par les modèles de recherche d'emploi ou job search. Or, comme le concèdent l'employer search. Cet article prolonge cette intuition en se donnant pour objectif de mettre en'hypothèse travaillée est celle d'un lien entre la façon dont s'opèrent les mises en relation sur le marché du travail

Paris-Sud XI, Université de

216

LES TIC DANS L'ENSEIGNEMENT SUPRIEUR FRANAIS : DISCOURS INSTITUTIONNELS ET MONOGRAPHIES -PROMESSE, MENACE ET VISIBILIT  

E-Print Network (OSTI)

LES TIC DANS L'ENSEIGNEMENT SUP�RIEUR FRAN�AIS : DISCOURS INSTITUTIONNELS ET MONOGRAPHIES nous proposons d'examiner les discours institutionnels sur l'intégration des TIC2 dans l'enseignement supérieur et la place que les TIC occupent dans les établissements. Après avoir étudié les discours

Paris-Sud XI, Université de

217

Transformations sociales chez les Cherokees, 1794-1827.  

E-Print Network (OSTI)

??Bouleversements démographiques, pressions assimilatrices, défaites militaires et rivalités territoriales : ce mémoire étudie les transformations que connaît la société Cherokee sous l’impulsion de ces forces… (more)

Laramée, François Dominic

2013-01-01T23:59:59.000Z

218

L'Amrique latine ou les Amriques latines Georges Couffignal  

E-Print Network (OSTI)

, le Suriname, la Guyane, la Jamaïque, la Guadeloupe, la Martinique et les mini �tats de la Caraïbe. Au

Paris-Sud XI, Université de

219

Sourabh V. Apte 204 Rogers Hall (541) 737 7335  

E-Print Network (OSTI)

-16, 2008. 3. Moin, P., and Apte S.V., "Large-eddy Simulation of Realistic Gas Turbine Combustors," AIAA and Validation Needs for Gas Turbine Combustors). 4. Apte, S.V., and Yang, V., "A Large-eddy Simulation Study Dynamics of Homogeneous Solid Propellant in a Rocket Motor," Combustion and Flame, Vol. 131, pp. 110

Apte, Sourabh V.

220

Center for Turbulence Research Annual Research Briefs 2001  

E-Print Network (OSTI)

Center for Turbulence Research Annual Research Briefs 2001 3 Large-eddy simulation of gas turbine. Motivation and objectives This report discusses our progress towards developing a numerical algorithm, and solver capable of performing large-eddy simulation in geometries as complex as the combustor of a gas-turbine

Apte, Sourabh V.

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221

Recherche de concepts fdrateurs dans les bases de donnes gographiques  

E-Print Network (OSTI)

the search for a set of generic "federating concepts" for describing the geographical world in a more general par- tie les processus qui créeront les liens entre objets en se fondant sur leur géométrie, il

Joseph Fourier Grenoble-I, Université

222

La Radioactivit, les Radiations, l'Ionisation JOURNAL DE PHYSIQUE  

E-Print Network (OSTI)

)MENTALE M�MOIRES ORIGINAUX Tables des constantes radioactives Par Léon KOLOWRAT Des tableaux résumant les'hui; mesurée par l'in~~er·e de a,, elle s'ob- tient d'ailleurs simplement en multipliant T par ~,~ ~`~7. Les

Boyer, Edmond

223

ISO 9001 : LES ENJEUX DU RECOURS A UN REFERENTIEL  

E-Print Network (OSTI)

ISO 9001 : LES ENJEUX DU RECOURS A UN REFERENTIEL QUALITE SUPPLEMENTAIRE POUR LA PROFESSION de déterminer les enjeux principaux de l'obtention de la norme ISO 9001 pour un cabinet d of obtaining the standard ISO 9001 for a certified public accountant firm. Initially, we will reconsider

Boyer, Edmond

224

L'ambiance en science politique est stimulante. Les professeurs,  

E-Print Network (OSTI)

l'�tat, le compor- tement des �lecteurs, la repr�sentation des citoyens, les affaires* ............................................................. AUT. HIV. Pour acqu�rir des aptitudes intellectuelles permettant d'analyser les ph�nom�nes politiques* ................................................................................................ AUT. HIV. Mineure en science politique

Parrott, Lael

225

Les Roms comme minorit ethnique ? Un questionnement roumain.  

E-Print Network (OSTI)

1 Les Roms comme « minorité ethnique » ? Un questionnement roumain. Martin Olivera Article publié dans Roms et Gens du Voyage, nouvelles perspectives de recherche, Etudes tsiganes, n°39-40, 3ème acquis : les « Roms et Voyageurs » (Roma and Travellers) forment une minorité européenne, comptant entre

Paris-Sud XI, Université de

226

E-Print Network 3.0 - adjuvante pour les Sample Search Results  

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

pour les Search Powered by Explorit Topic List Advanced Search Sample search results for: adjuvante pour les Page: << < 1 2 3 4 5 > >> 1 CCOOLLEE DDOOCCTTOORRAALLEE 338800...

227

Les étrangers extra-communautaires à l’hôpital  

Science Journals Connector (OSTI)

Résumé La question du droit des étrangers extra-communautaires à l’hôpital peut être abordée à la fois sous l’angle des patients et des praticiens. La législation relative à l’accès aux soins des étrangers tente de concilier le droit aux soins et les difficultés de financement de notre système de santé. Elle a récemment été durcie pour éviter les abus et ne répondre qu’à des situations d’urgence vitale. Les praticiens à diplôme étranger ont, quant à eux, longtemps été maintenus dans des statuts précaires, bien que des lois successives aient cherché à régulariser ces « PADHUE ». Aujourd’hui, une concertation est en cours pour améliorer le sort des 6 000 médecins à diplôme étranger qui ne disposent toujours pas d’un droit à un exercice plein et entier en France. Elle ne dispensera cependant pas les autorités d’une réflexion plus globale sur le numerus clausus dans les facultés de médecine.

Dominique Peljak; Aurélie Rama

2006-01-01T23:59:59.000Z

228

Les marchands orientaux et les langues occidentales au XVIIe sicle : l'exemple des Choffelins de Marseille  

E-Print Network (OSTI)

1 Les marchands orientaux et les langues occidentales au XVIIe siècle : l'exemple des « Choffelins » de Marseille La question des marchands et des langues à l'époque moderne est loin d'être un domaine la question des marchands et des langues dans le commerce de moyenne et longue distances. Le but de

Paris-Sud XI, Université de

229

Rendre publique l'valuation des SHS : les controverses sur les listes de revues de l'AERES*  

E-Print Network (OSTI)

Rendre publique l'évaluation des SHS : les controverses sur les listes de revues de l'AERES* David aux sciences humaines et sociales : la liste des revues scientifiques publiée en juillet 2008 par l'AERES French Research Assessment institution (AERES). It highlights the filiations of that tool with previous

Paris-Sud XI, Université de

230

Learning environment simulator: a tool for local decision makers and first responders  

SciTech Connect

The National Infrastructure Simulation and Analysis Center (NISAC) has developed a prototype learning environment simulator (LES) based on the Critical Infrastructure Protection Decision Support System (CIPDSS) infrastructure and scenario models. The LES is designed to engage decision makers at the grass-roots level (local/city/state) to deepen their understanding of an evolving crisis, enhance their intuition and allow them to test their own strategies for events before they occur. An initial version is being developed, centered on a pandemic influenza outbreak and has been successfully tested with a group of hospital administrators and first responders. LES is not a predictive tool but rather a simulated environment allowing the user to experience the complexities of a crisis before it happens. Users can contrast various approaches to the crisis, competing with alternative strategies of their own or other participants. LES is designed to assist decision makers in making informed choices by functionally representing relevant scenarios before they occur, including impacts to critical infrastructures with their interdependencies, and estimating human health & safety and economic impacts. In this paper a brief overview of the underlying models are given followed by a description of the LES, its interface and usage and an overview of the experience testing LES with a group of hospital administrators and first responders. The paper concludes with a brief discussion of the work remaining to make LES operational.

Leclaire, Rene J [Los Alamos National Laboratory; Hirsch, Gary B [CLE, INCORPORATED

2009-01-01T23:59:59.000Z

231

Dynamic LES Modeling of a Diurnal Cycle  

Science Journals Connector (OSTI)

The diurnally varying atmospheric boundary layer observed during the Wangara (Australia) case study is simulated using the recently proposed locally averaged scale-dependent dynamic subgrid-scale (SGS) model. This tuning-free SGS model enables ...

Sukanta Basu; Jean-François Vinuesa; Andrew Swift

2008-04-01T23:59:59.000Z

232

Ngociation de spectre dans les rseaux de radio cognitive  

E-Print Network (OSTI)

1 Négociation de spectre dans les réseaux de radio cognitive Rapport de recherche - Juin 2013 ................................................................................................................................... 4 I. Chapitre I : Réseaux de radio cognitive)............................................................................................... 6 I.3 Radio cognitive

Paris-Sud XI, Université de

233

LES SYSTEMES DE MESURE DE PERFORMANCE EN COLLECTIVITES  

E-Print Network (OSTI)

1 LES SYSTEMES DE MESURE DE PERFORMANCE EN COLLECTIVITES TERRITORIALES : UN ECLAIRAGE A LA LECTURE progressive de la LOLF depuis 2002 représente la déclinaison en France des principes du New Public Management

Paris-Sud XI, Université de

234

Les maladies concernées, aujourd’hui, par la psychochirurgie  

Science Journals Connector (OSTI)

Les troubles obsessionnels compulsifs,avec par exemple leurs rituels de vérification ou de lavage, peuvent devenir extrêmement invalidants, et dans 10 % des cas ne répondre à aucune psychothérapie ni traitemen...

Marc Lévêque

2013-01-01T23:59:59.000Z

235

Ce que les gaz molculaires nous cachent encore  

E-Print Network (OSTI)

physique moléculaire en milieu dilué Interférométrie IR résolution 0.0007 cm-1 (20 MHz) large couverture spectrale jet moléculaire supersonique plasma froid par décharge électrique Différents environnements pour-100 K) - Dans les comètes, dans les atmosphères planètaires, Mesures quantitatives, bilan énergétique

236

Un lemme de Morse pour les surfaces convexes  

E-Print Network (OSTI)

lemme de Morse pour les g'eod'esiques affirme que dans une vari'et'e `* *a cour- bure strictement n'egative et `a g'eom'etrie born'ee, toute quasi-g'eod'esique * *est `a une distance born'ee d'une g'eod compactes est dense ; (ii)une feuille g'en'erique est dense ; (iii)les flots g'eod'esiques de deux m

Labourie, François

237

Modeling & Simulation  

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

Modeling & Simulation Modeling & Simulation Research into alternative forms of energy, especially energy security, is one of the major national security imperatives of this...

238

Waste-To-Energy Feasibility Analysis: A Simulation Model  

E-Print Network (OSTI)

Waste- To- Energy Feasibility Analysis: A Simulation Model Viet- An Duong College of Engineering://www.funginstitute.berkeley.edu/sites/default/ les/WasteToEnergy.pdf May 1, 2014 130 Blum Hall #5580 Berkeley, CA 94720-5580 | (510) 664-4337 | www of the main battles of our generation. Using waste to produce electricity can be a major source of energy

Sekhon, Jasjeet S.

239

Institut FARMAN Simulation, modlisation, tests virtuels de systmes complexes  

E-Print Network (OSTI)

1 Institut FARMAN Simulation, modélisation, tests virtuels de systèmes complexes PROJET DE sur les entrées. A titre d'exemple, dans un précédent projet FARMAN (BOOST2), la méthode a été

240

Psychologie Franaise (2000), 45, 4, 295-306. Pour une thorie "motrice" de la simulation  

E-Print Network (OSTI)

1 Psychologie Française (2000), 45, 4, 295-306. Pour une théorie "motrice" de la simulation Joëlle-circuit", d'une manière qui n'engage pas directement une réponse motrice ; mais la simulation exploite les

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "large-eddy simulation les" 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

ARM - Publications: Science Team Meeting Documents  

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

Cloud-Resolving Simulations of Boundary-Layer Cloud Regimes with a Cloud-Resolving Simulations of Boundary-Layer Cloud Regimes with a Third-Order Turbulence Cheng, A.(a,b) and Xu, K.-M.(a), Atmospheric Sciences, NASA Langley Research Center (a), Hampton University (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting LES (large eddy simulation) models can explicitly resolve large turbulent eddies, which contain m ost of the turbulent kinetic energy and do most of the transport in the boundary layer. These edd ies have to be parameterized in cloud-resolving models (CRMs), which have much coarser resolution . A sophisticated turbulent parameterization is needed in order to produce adequate simulations o f cloud processes in CRMs. Most CRMs use a one- and a half-order prognostic turbulent kinetic ene rgy closure. Third-order

242

Enqute insertion professionnelle 2006 Les diplms de DEUST en 2004  

E-Print Network (OSTI)

informateur médical (VIM) sont en emploi. 5 (sur 8) diplômés de DEUST technicien qualité industrielle (TQI) et'études Recherche d'emploi 27 4 Les poursuites d'études Exception faite du DEUST VIM, plus de la moitié des VIM. #12;Note méthodologique Les données synthétisées ici sont le résultat d'une enquête annuelle

Jeanjean, Louis

243

Slide 1  

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

INTRODUCTION INTRODUCTION Boundary layer clouds (BLCs) have a significant impact on the radiative budget of the Earth but are difficult to represent in climate models. In the past, large eddy simulation (LES) has served as a major role in providing a better understanding of the BLCs and developing parameterizations of cloud turbulence and convection processes. ARM over the years has made a great progress in developing a suite of key remote sensing instruments, such as MMCR and WACR, for observing BLCs under various weather conditions. The primary goal of the ARM LES Testbed (ALT) is to improve parameterizations of BLCs through systematically evaluating LESs using ARM high temporal and spatial resolution cloud radar measurements. To cope with the advanced ARM cloud radar data and fulfill the

244

Minimalist Model of Ice Microphysics in Mixed-phase Stratiform Clouds  

SciTech Connect

The question of whether persistent ice crystal precipitation from super cooled layer clouds can be explained by time-dependent, stochastic ice nucleation is explored using an approximate, analytical model, and a large-eddy simulation (LES) cloud model. The updraft velocity in the cloud defines an accumulation zone, where small ice particles cannot fall out until they are large enough, which will increase the residence time of ice particles in the cloud. Ice particles reach a quasi-steady state between growth by vapor deposition and fall speed at cloud base. The analytical model predicts that ice water content (wi) has a 2.5 power law relationship with ice number concentration ni. wi and ni from a LES cloud model with stochastic ice nucleation also confirm the 2.5 power law relationship. The prefactor of the power law is proportional to the ice nucleation rate, and therefore provides a quantitative link to observations of ice microphysical properties.

Yang, F.; Ovchinnikov, Mikhail; Shaw, Raymond A.

2013-07-28T23:59:59.000Z

245

Infection naturelle des primates non humains par les spumavirus et transmission inter-espèces au Gabon.  

E-Print Network (OSTI)

??Les spumavirus (SV) sont des rétrovirus exogènes de la sous-famille des Spumavirinae appartenant à la famille des Retroviridae. L’infection naturelle chez les primates non humains… (more)

Mouinga Ondeme, Augustin Ghislain

2011-01-01T23:59:59.000Z

246

Influence du strontium sur la minéralisation initiée par les vésicules matricielles et sur l’activité de la phosphatase alcaline.  

E-Print Network (OSTI)

??Les vésicules matricielles sont des organites extracellulaires impliques dans les processus de minéralisation. Nous avons détermine le mode d’action du strontium, ion contenu dans le… (more)

Bechkoff, Géraldine

2009-01-01T23:59:59.000Z

247

Propriétés structurales et magnétiques d'un cristal liquide minéral, les suspensions de goethite (alpha-FeOOH).  

E-Print Network (OSTI)

??Notre travail a porté sur différents cristaux liquides minéraux, et principalement sur les suspensions aqueuses de goethite. Après les avoir caractérisées, nous avons démontré qu'elles… (more)

LEMAIRE, Bruno

2002-01-01T23:59:59.000Z

248

Communication n 23 Atelier 19 : TIC : utilisation dans les pdagogies scolaires  

E-Print Network (OSTI)

Communication n° 23 Atelier 19 : TIC : utilisation dans les pédagogies scolaires USAGES DES TIC les résultats d'une étude qualitative portant sur les usages des TIC par des formateurs dans le cadre à la présente recherche. Les entretiens semi- directifs ont porté sur des usages des TIC que font

Paris-Sud XI, Université de

249

Dfinir les TIC pour mieux comprendre leur impact sur l'conomie Nathalie Coutinet  

E-Print Network (OSTI)

1 Définir les TIC pour mieux comprendre leur impact sur l'économie Nathalie Coutinet Maître de : Les difficultés d'évaluation des répercussions des TIC au début des années quatre-vingt-dix ont par les économistes et les statisticiens à mesurer l'impact de l'émergence et de la diffusion des TIC

Paris-Sud XI, Université de

250

PROGRAMME SMINAIRES TUDIANTS AUTOMNE 2011 Les vendredis 11 h 30 Pavillon Roger-Gaudry  

E-Print Network (OSTI)

ST�PHANE TURCOTTE Groupe de recherche du Professeur Lubell « Les N-aminosulfamides comme peptidomimétiques

Charette, André

251

Analyse Statistique de la Pollution par les PM10 en Haute-Normandie  

E-Print Network (OSTI)

Analyse Statistique de la Pollution par les PM10 en Haute-Normandie Fran¸cois-Xavier Jolloisa travail porte sur l'analyse de la pollution par les particules PM10 en r´egion Haute- Normandie entre 2004´eaires et les m´elanges de mod`eles lin´eaires, on mod´elise les effets des vari- ables sur la pollution par

Boyer, Edmond

252

Simulation Tools  

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

Building simulation tool screen capture Building simulation tool screen capture Simulation Tools Researchers develop whole-building energy simulation software programs that allow architects and building engineers to design or retrofit buildings for maximum energy efficiency and occupant comfort. Programs developed by researchers include: the EnergyPlus whole building simulation program, the Modelica Buildings library for rapid prototyping and controls design, the Building Controls Virtual Test Bed for co-simulation and for model-based operation, and the GenOpt generic optimization program. Contacts Philip Haves PHaves@lbl.gov (510) 486-6512 Michael Wetter MWetter@lbl.gov (510) 486-6990 Links Simulation Research Group Batteries and Fuel Cells Buildings Energy Efficiency Applications Commercial Buildings

253

Optimal temperature pro les for post-exposure bake of photo-resist  

E-Print Network (OSTI)

Optimal temperature pro les for post-exposure bake of photo-resist Anders Hansson and Stephen Boyd how to compute optimal temperature pro les for post-exposure bake of photo-resist. The pro les are optimal in the sense that the worst case non-uniformity of the dissolution rate in the photo

254

Distributed Simulation and Simulation Practice  

Science Journals Connector (OSTI)

The possibilities of distributed simulation have been discussed for well over a decade, yet there is only limited evidence of its implementation, particularly within industry. The reasons for this are discussed by identifying the potential applications ... Keywords: Distributed simulation, complexity, innovation, simulation practice

Stewart Robinson

2005-01-01T23:59:59.000Z

255

LES VARIATIONS DE LA COMPOSITION MINRALE DU LAIT DE VACHE  

E-Print Network (OSTI)

. Cette teneur de 0,4 g de HgCl2 par litre de lait ne perturbe pas le'une solution (1) de sublimé pour 160 ml de lait, les échantillons ont été placés en chambre froide à 0-20 C

Paris-Sud XI, Université de

256

LES ORIGINES DE LAPLACE: SA GÉNÉALOGIE,? SES ÉTUDES  

Science Journals Connector (OSTI)

......de former son esprit et de lui donner le gout de la culture. II font done absolument...l'abbe Louis de Laplace inculqua son gout pour les sciences a son jeune neveu, maia...ecclesiastiqueU- Peut-etre y avait-il pris gout lui-meme au contact de son oncle Louis......

PAR L'ABBÉ G. A. SIMON

1929-12-01T23:59:59.000Z

257

Les nanosciences : (r)volution des savoirs et des technologies ?  

E-Print Network (OSTI)

1 Les nanosciences : (r)évolution des savoirs et des technologies ? Jean-Louis Pautrat Physicien, ancien Directeur de la Fondation "Nanosciences aux limites de la nanoélectronique" 23 rue des Martyrs : miniaturisation ; microélectronique ; nanomatériaux ; nanosciences ; nanomédecine 1 - Introduction Tout « honnête

Boyer, Edmond

258

PRELIMINARY LES OVER A HYPERSONIC ELLIPTICAL CROSS-SECTION CONE  

E-Print Network (OSTI)

PRELIMINARY LES OVER A HYPERSONIC ELLIPTICAL CROSS-SECTION CONE M.P. MARTIN Mechanical. The characteristics of the hypersonic flow around an elliptical- cross section cone and the computational code of transitional and turbulent flows are not fully understood. This is especially true in the hypersonic regime

Martín, Pino

259

Les infinitifs en persan Reza Mir-Samii*  

E-Print Network (OSTI)

Les infinitifs en persan Reza Mir-Samii* & Pollet Samvelian** 1. INTRODUCTION L''infinitif persan syntaxiques de l'infinitif en persan. Cette description nous permettra d'identifier deux emplois distincts'INFINITIF EN PERSAN L'infinitif persan est formé d'un radical verbal et de la désinence -an. Chaque forme

Paris-Sud XI, Université de

260

ESPACE PROBLEME, FUSION ET PARALLLISME DANS LES INTERFACES MULTIMODALES  

E-Print Network (OSTI)

Homme­Machine est l'extension des facultés sensori­motrices des ordinateurs en vue de répondre aux­machine [Krueger, 1985]. L'objectif des ``interfaces nouvelles'' est d'étendre les facultés sensori­motrices des

Nigay, Laurence

Note: This page contains sample records for the topic "large-eddy simulation les" 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

ESPACE PROBLEME, FUSION ET PARALLLISME DANS LES INTERFACES MULTIMODALES  

E-Print Network (OSTI)

Homme-Machine est l'extension des facultés sensori-motrices des ordinateurs en vue de répondre aux-machine [Krueger, 1985]. L'objectif des "interfaces nouvelles" est d'étendre les facultés sensori-motrices des

Nigay, Laurence

262

Association Les Amis de Mathias Delcor Journe d'tude  

E-Print Network (OSTI)

Catalogne 29 Juillet 2008 Palau de Cerdagne (Pyrénées Orientales) hal-00486491,version1-25May2010 Manuscrit auteur, publié dans "Les Juifs dans la société Médiévale en Catalogne, Palau de Cerdagne (Pyrénées

Paris-Sud XI, Université de

263

Micro et Nano Physique Cours 1 : les principes de la  

E-Print Network (OSTI)

Micro et Nano Physique (MNP) Cours 1 : les principes de la mécanique quantique (approche conceptuelle) #12;Micro et nano physique (MNP)page 1 Pourquoi un cours sur la physique microscopique ? · Une fondamentaux à la base des technologies du numérique #12;Micro et nano physique (MNP)page 2 Organisation de l

Rioul, Olivier

264

Les formes organisationnelles mdiatises par les TIC tirailles entre logique d'autonomie et logique de contrle : une dmocratie toujours limite  

E-Print Network (OSTI)

Les formes organisationnelles médiatisées par les TIC tiraillées entre logique d'autonomie et'organisation médiatisées par les TIC à travers l'exemple des communautés virtuelles entourant Internet, et plus structure. halshs-00421613,version1-2Oct2009 Manuscrit auteur, publié dans "5èmes Doctoriales du GDR TIC et

Paris-Sud XI, Université de

265

Quantum Simulation  

E-Print Network (OSTI)

Simulating quantum mechanics is known to be a difficult computational problem, especially when dealing with large systems. However, this difficulty may be overcome by using some controllable quantum system to study another less controllable or accessible quantum system, i.e., quantum simulation. Quantum simulation promises to have applications in the study of many problems in, e.g., condensed-matter physics, high-energy physics, atomic physics, quantum chemistry and cosmology. Quantum simulation could be implemented using quantum computers, but also with simpler, analog devices that would require less control, and therefore, would be easier to construct. A number of quantum systems such as neutral atoms, ions, polar molecules, electrons in semiconductors, superconducting circuits, nuclear spins and photons have been proposed as quantum simulators. This review outlines the main theoretical and experimental aspects of quantum simulation and emphasizes some of the challenges and promises of this fast-growing field.

I. M. Georgescu; S. Ashhab; Franco Nori

2014-03-13T23:59:59.000Z

266

Locally Employed Staff (LES)/Foreign Service National (FSN) of the Year Award  

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

Locally Employed Staff (LES)/Foreign Service National (FSN) Locally Employed Staff (LES)/Foreign Service National (FSN) of the Year Award The Locally Employed Staff (LES)/Foreign Service National (FSN) of the Year Award is designed to recognize special contributions made by the Department's LES/FSN's in achieving the U.S. Department of Energy's (DOE) and United States Government's (USG) foreign policy goals and objectives. The LES/FSN of the Year Award is the Department's most prestigious award for non- Federal locally employed staff serving the Department overseas, and recognizes their outstanding achievements for the period of 1 October through 30 September each year. This

267

L'ONOMASTIQUE IRANIENNE DANS LES SOURCES SYRIAQUES Quand les chrtiens d'Iran changent de nom (IVe-VIIe s.)  

E-Print Network (OSTI)

consacré au persan, kurde et ossète. Le vol. 4 concernera les noms propres des monnaies par M. Alram (1987

Paris-Sud XI, Université de

268

A Standard format for Les Houches event files  

SciTech Connect

A standard file format is proposed to store process and event information, primarily output from parton-level event generators for further use by general-purpose ones. The information content is identical with what was already defined by the Les Houches Accord five years ago, but then in terms of Fortran commonblocks. This information is embedded in a minimal XML-style structure, for clarity and to simplify parsing.

Alwall, J.; Ballestrero, A.; Bartalini, P.; Belov, S.; Boos, E.; Buckley, A.; Butterworth, J.M.; Dudko, L.; Frixione, S.; Garren, L.; Gieseke, S.; Gusev, A.; Hinchliffe,I.; Huston, J.; Kersevan, B.; Krauss, F.; Lavesson, N.; Lonnblad, L.; Maina, E.; Maltoni, F.; Mangano, M.L.; /Louvain U. /Dresden, Tech. U. /Karlsruhe U., TP /Democritos Nucl. Res.Ctr. /INFN, Genoa /INFN, Turin /Turin U. /Cracow, INP /Dubna, JINR /SINP, Moscow /Serpukhov, IHEP /Ljubljana U. /Lund U. /CERN /Zurich, ETH /Cambridge U. /Durham U., IPPP/University Coll. London /Manchester U. /Fermilab /LBL, Berkeley; ,

2006-09-01T23:59:59.000Z

269

Plongements fractionnaires Lien avec les empilements de boules  

E-Print Network (OSTI)

Plongements fractionnaires Lien avec les empilements de boules Preuve du th´eor`eme de Naor et Neiman Avatars du th´eor`eme de plongement d'Assouad P. Pansu 13 avril 2011 P. Pansu Avatars du th´eor th´eor`eme de Naor et Neiman On d´ecrit le probl`eme du plongement d'espaces doublants dans des

Pansu, Pierre

270

Les pompes chaleur, maillon-cl de la transition nergtique?  

E-Print Network (OSTI)

froid et du chaud. Avec un triplement prévu de leur production dans le cadre de la stratégie énergétique systèmes, pour éviter les problèmes techniques et optimiser leurs performances Identifier le rôle des'énergétique industrielle (LENI) 10h20 Pause 10h50 Integration of heat pumps in intensive renewable energy scenarios Poul

Loewith, Robbie

271

Simulation numrique de l'activit lectrique dans l'oreillette gauche et les veines pulmonaires  

E-Print Network (OSTI)

.coudiere@inria.fr, jacques.henry@inria.fr MOD�LE MATH�MATIQUE Bidomaine : (CmtV + Iion(V )) - divDii = 0 (CmtV + Iion(V )) électrophysiologie + divDee couplage = Iapp stim Monodomaine : (CmtV + Iion(V )) électrophysiologie + divDV couplage

Boyer, Edmond

272

SMACC : Gestion des risques dans les projets de construction par simulation multi-agent  

E-Print Network (OSTI)

Université de Bordeaux, France bUMR IDEES - MTG, Université de Rouen, France Résumé Ces dernières années ont of a multi-criteria decision making process (via ELECTRE III) aiming at helping decision makers to choose

Paris-Sud XI, Université de

273

Lagrangian investigation of the precipitation efficiency of convective clouds  

Science Journals Connector (OSTI)

The precipitation efficiency of cumulus-congestus clouds is investigated with a new Lagrangian particle framework for large-eddy simulations. The framework is designed to track particles representative of individual water molecules. A Monte-Carlo ...

Wolfgang Langhans; Kyongmin Yeo; David M. Romps

274

SciTech Connect: Comparison of the Dynamic Wake Meandering Model...  

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

Wake Meandering Model, Large-Eddy Simulation, and Field Data at the Egmond aan Zee Offshore Wind Plant: Preprint Citation Details In-Document Search Title: Comparison of the...

275

Examen de mathmatiques 2009 Dure : 45 minutes. Je souhaite voir apparatre les calculs sur les copies. Tout rsultat livr  

E-Print Network (OSTI)

STIA3 Examen de mathématiques 2009 Durée : 45 minutes. Je souhaite voir apparaître les calculs sur la solution générale de l'équation di¤érentielle : y0 + y = 3x2 + 7: #12;STIA3 Examen de condition initiale y (0) = 1: #12;STIA 3 / Année 2011 Mise a niveau Math Durée 45 minutes Exercice 1

Mas, André

276

LA REVUE DE L'EPI N 96 LES USAGES PDAGOGIQUES DU LOGICIEL LIBRE LES USAGES PDAGOGIQUES  

E-Print Network (OSTI)

professionnelle quotidienne. La question des usages de ces technologies est au centre des préoccu- pations de chacun : que pouvons-nous faire avec les Technologies de l'Information et de la Communication pour l construction d'un intranet académique par le Conseil régional de Picardie, et nous nous sommes réunis entre

Paris-Sud XI, Université de

277

ARM - Publications: Science Team Meeting Documents  

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

Solar Radiative Influences on Drop Growth Solar Radiative Influences on Drop Growth Harrington, J.Y, Hartman, C., and Verlinde, J., The Pennsylvania State University Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting The offsetting effects of solar heating and infrared cooling on the vapor-depositional growth of cloud droplets is investigated. In this study, a marine stratocumulus cloud was simulated by using a large eddy simulation (LES) model and a detailed microphysical bin model. Including infrared cooling as well as solar heating had two effects. The first effect is related to the fact that vapor-depositional growth of drops is radius dependent - solar heating effects dominated at larger drop sizes (> 100 microns) and infrared cooling effects dominated at smaller drop sizes

278

Microsoft PowerPoint - ARM-STM-Cheng-poster2007  

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Multi-scale Modeling Framework (MMF) and Multi-scale Modeling Framework (MMF) and global cloud resolving model (GCRM) will play an important role in addressing important climate issues, such as global warming. The difficulties associated with the parameterization of deep convective clouds can be avoided, but those associated with the parameterization of boundary- layer clouds remains. Low-order turbulence closure (LOC) and third- order turbulence closure (TOC) are extensively used for parameterizations for boundary-layer clouds. Subgrid-scale turbulence transports of scalars are parameterized differently in the two types of closure. 2. Experiment Design The BOMEX and ARM shallow cumulus cases are simulated with System for Atmospheric Modeling (SAM) CRM and the SAM LES (large- eddy simulation) to explore the sensitivity of the

279

Master thesis: "Validation of wake-simulation models based on long-range lidar measurements."  

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Figure 1: Simulation of lidar measurements in the wake of a wind turbine using a LES generated wind field mapping and wake/vortex detection in several research projects and airport applications. At ForWind resolution wind data from the inflow and wake of two multi-megawatt wind energy converters. Possible

Peinke, Joachim

280

Locally Employed Staff (LES)/Foreign Service National (FSN) of the Year  

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

Locally Employed Staff (LES)/Foreign Service National (FSN) of the Locally Employed Staff (LES)/Foreign Service National (FSN) of the Year Award Locally Employed Staff (LES)/Foreign Service National (FSN) of the Year Award The Locally Employed Staff (LES)/Foreign Service National (FSN) of the Year Award is designed to recognize special contributions made by the Department's LES/FSN's in achieving the U.S. Department of Energy's (DOE) and United States Government's (USG) foreign policy goals and objectives. The LES/FSN of the Year Award is the Department's most prestigious award for non-Federal locally employed staff serving the Department overseas, and recognizes their outstanding achievements for the period of 1 October through 30 September each year. This special award program has been established in accordance with the requirements of

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281

Multi-scale thermalhydraulic analyses performed in Nuresim and Nurisp projects  

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The NURESIM and NURISP successive projects of the 6. and 7. European Framework Programs joined the efforts of 21 partners for developing and validating a reference multi-physics and multi-scale platform for reactor simulation. The platform includes system codes, component codes, and also CFD or CMFD simulation tools. Fine scale CFD simulations are useful for a better understanding of physical processes, for the prediction of small scale geometrical effects and for solving problems that require a fine space and/or time resolution. Many important safety issues usually treated at the system scale may now benefit from investigations at a CFD scale. The Pressurized Thermal Shock is investigated using several simulation scales including Direct Numerical Simulation, Large Eddy Simulation, Very Large Eddy Simulation and RANS approaches. At the end a coupling of system code and CFD is applied. Condensation Induced Water-Hammer was also investigated at both CFD and 1-D scale. Boiling flow in a reactor core up to Departure from Nucleate Boiling or Dry-Out is investigated at scales much smaller than the classical subchannel analysis codes. DNS was used to investigate very local processes whereas CFD in both RANS and LES was used to simulate bubbly flow and Euler-Lagrange simulations were used for annular mist flow investigations. Loss of Coolant Accidents are usually treated by system codes. Some related issues are now revisited at the CFD scale. In each case the progress of the analysis is summarized and the benefit of the multi-scale approach is shown. (authors)

Bestion, D. [CEA-Grenoble, DEN-DANS-DM2S, Grenoble, (France); Lucas, D. [Helmholtz-Zentrum Dresden-Rossendorf, Dresden, (Germany); Anglart, H. [KTH Royal Institute of Technology, Stockholm, (Sweden); Niceno, B. [Paul Scherrer Institute, Villingen, (Switzerland); Vyskocil, L. [Nuclear Research Institute Rez plc, Rez, (Czech Republic)

2012-07-01T23:59:59.000Z

282

5 Le coton-poudre rend positifs presque tous les corps (le sulfure de cuivre est la seule exception trouve par M. Hagenbach) avec lesquels on le frotte. Ce  

E-Print Network (OSTI)

rentrant les uns dans les autres, comme ces pilcs de verres de Bohême dont on se sert dans les laboratoires

Paris-Sud XI, Université de

283

Quelques slides sur les gr n s dans la serie : "hangman game for dummies"  

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Quelques slides sur les gr n s dans la s´erie : "hangman game for dummies" Laurent LIFL, Universit´e Lille 1 - INRIA Journ´ees au vert 20 et 21 mai 2011 Laurent Quelques slides sur les gr n s #12;NGS://www.illumina.com/systems/miseq.ilmn Laurent Quelques slides sur les gr n s #12;Alors, de quoi vais-je bien pouvoir parler ? Laurent Quelques

Noé, Laurent

284

Les rseaux judiciaires en Iraq l'poque abbasside Mathieu Tillier  

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1 Les réseaux judiciaires en Iraq à l'époque abbasside par Mathieu Tillier Parmi les institutions nature et sur leur mode de fonctionnement en Iraq entre le II e /VIII e et le IV e /X e siècle. La ville (Bagdad fut divisée en trois 1 M. Tillier, Les cadis d'Iraq à l'époque abbside : organisation

Paris-Sud XI, Université de

285

Contribution à la métrologie magnétique des multipôles d'accélérateurs : les quadrupôles du Synchroton SOLEIL.  

E-Print Network (OSTI)

??Dans les accélérateurs de particules de type synchrotron tels que SOLEIL, le faisceau de particules doit répondre à des critères toujours plus exigeants afin d’améliorer… (more)

Madur, Arnaud

2006-01-01T23:59:59.000Z

286

E-Print Network 3.0 - azotes sur les Sample Search Results  

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de soude; j'ai cherch voir si, malgr ces... diffrences entre les proprits phy- siques, la ... Source: Ecole Polytechnique, Centre de mathmatiques Collection:...

287

E-Print Network 3.0 - accelerators les accelerateurs Sample Search...  

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Search Powered by Explorit Topic List Advanced Search Sample search results for: accelerators les accelerateurs Page: << < 1 2 3 4 5 > >> 1 STRUCTURE ACCLRATRICE DE SYMTRIE...

288

E-Print Network 3.0 - avec les surfaces Sample Search Results  

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Centre de mathmatiques Collection: Mathematics 30 Ecoulements multiphasiques TD1: tension de surface Summary: Antkowiak Film1: On chauffe la surface localement. Les...

289

E-Print Network 3.0 - ajoutee pour les Sample Search Results  

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: CONTR OLE DE LA TAILLE DES NANOPARTICULES D'OXYDE Summary: echees a chaud sous atmosphere seche. Les couches poreuses sont densifiees pour obtenir des couches de......

290

LES KARATES UNE COMMUNAUTE CAIROTE A L'HEURE DE L'TAT-NATION  

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ensuite en Palestine au Xe siècle, et arriva en Egypte. Un certain nombre de familles persanes, dont les

Paris-Sud XI, Université de

291

Aperçu sur les groupements secondaires à Marantaceae, Zingiberaceae et Costaceae de la Forêt des Abeilles (Gabon)  

Science Journals Connector (OSTI)

Les groupements à Marantaceae, Zingiberaceae et Costaceae sont recensés en milieu naturel au Gabon dans la Forêt des Abeilles aux environs...

M. M. Dhetchuvi

1996-01-01T23:59:59.000Z

292

Les TUdes d'eRGoTHRAPie Enseignements de l'Anne Prparatoire  

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'admission à l'institut de formation en ergothérapie numerus clausus 3 Années de FoRMATion Les études s

Jeanjean, Louis

293

E-Print Network 3.0 - approve les regles Sample Search Results  

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Advanced Search Sample search results for: approve les regles Page: << < 1 2 3 4 5 > >> 1 Completion contrainte avec simplification Jean-Pierre Jouannaud1 Summary: eructibles)....

294

LES FRACTIONS DCIMALES : UN ART D'INGNIEUR ? Dans les premires dcennies du XIXe sicle, le calcul dcimal fait partie du bagage  

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décimales dans les tables de son Atlas de la science de l'ingenieur de 1825, tout comme Jean Joseph Regnault, dont les opérations sont décrites comme compliquées, et fractions décimales, aux opérations faciles élémentaire à l'époque moderne1. Mais les historiens en ont souvent déduit d'emblée, à partir de ses traces

Boyer, Edmond

295

Brigitte DUBEUF INRA Unit de Recherches sur les  

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France L'Appellation d'Origine Contrôlée (AOC) Les fromages AOC, au nombre de 32 en mai 1991 (figure 1, souvent semi-artisanales. #12;L'AOC garantit que le produitpossède des caractéristiques liées à un terroir. L'AOC garantit que le produit possède des caractéristiques liées à un terroir déterminé. La qualité

Paris-Sud XI, Université de

296

Periodisation : les transformations de Floquet et de Bloch  

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Fu(, X) = nZ u(X + nde1)e-i(x+nd) . Un simple changement de variable sur n permet de montrer que Fu : Fu(+ 2 d , X) = nZ u(X+nde1)e-i(x+nd) e-i2(x+nd)/d = e-i2x/d Fu(, X). On peut d´efinir une d´eriv´ees selon les deux directions x Fu(, X) = nZ x u(X + nde1)e-i(x+nd) + nZ u(X + nde1)(-i

Bidegaray, Brigitte

297

REVUE DE PHYSIQUE APPLIQUE Simulation d'un transistor MOS silicium-sur-isolant dsertion profonde  

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tensions de grilles avant (Vg1) et arrière (Vg2) appliquées. Nous dédui- sons aussi les caractéristiques Id(Vg1, Vg2) à faible tension de drain. Les caractéristiques Id(Vg2) simulées sont comparées aux caractéristiques Id(Vg2) obtenues avec des transistors CMOS/SOS. Le saphir de ces dispositifs a été localement

Boyer, Edmond

298

DE LA MINORITE NATIONALE A L'ETHNICITE PERIPHERIQUE. LES MAGYAROPHONES DE LA TRANSCARPATHIE (UKRAINE)  

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MINORITE NATIONALE A L'ETHNICITE PERIPHERIQUE. LES MAGYAROPHONES DE LA TRANSCARPATHIE (UKRAINE) Anne. Les Magyarophones de la Transcarpathie (Ukraine) », in : Paul Bauer, Christian Jacques, Mathieu (Ukraine). Anne-Marie Losonczy L'Europe centrale et orientale d'aujourd'hui est composée d

Paris-Sud XI, Université de

299

Les ressorts psychologiques des survivants d'une restructuration : quelques clefs de comprhension pour un  

E-Print Network (OSTI)

de « besoin de signification » (Lips- Wiersma et Morris, 2009) dont nous éclairons les sources par l signification » (Lips- Wiersma et Morris, 2009) dont nous éclairons les sources par l'intermédiaire du concept

Paris-Sud XI, Université de

300

Depuis les annes 1950, le recours l'automobile pour de courts  

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Depuis les années 1950, le recours à l'automobile pour de courts trajets quotidiens ne cesse de elles seules, à réduire le recours à l'automobile. La question se pose alors de cerner les conditions permettant de changer le comportement en matière de choix modal (bus ou automobile) : le station- nement ne

Paris-Sud XI, Université de

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While these samples are representative of the content of NLEBeta,
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301

Critres d'valuation pour les interfaces des systmes de recherche d'information  

E-Print Network (OSTI)

'information servent de lien entre les utilisateurs et les systèmes de recherche d'information, et permettent donc de comparer ces interfaces. ABSTRACT. Visualization of search results is an essential step in the Information that takes visualization of search results, many interfaces (which can be textual, in 2D or in 3D) have been

Paris-Sud XI, Université de

302

EIAH 2007 27,28 et 29 Juin Scnarisation Pdagogique et Ingnierie Dirig par les Modles  

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(MDA) · Propositions de 3 points de vue (et modèles associés) ­ Computer independent Model (CIM transformations de modèles · Généraliser le MDA à tout espace technologique ­ Orienté-objet, ontologies, documents

Laforcade, Pierre

303

Ontologies et classifications descriptives psychiatriques Au del du DSM : les ontologies comme aide  

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Ontologies et classifications descriptives psychiatriques Au delà du DSM : les ontologies comme'hospi- talisation issus du centre hospitalier Sainte-Anne, les ressources structurées seront la CIM-10, le DSM et problèmes de santé connexes (CIM - World Health Organization (1992)) dont le Chapitre 05 ­ « Troubles men

Paris-Sud XI, Université de

304

Transmission des connaissances dans les relations de coopration inter-entreprises : TIC versus face--face  

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1 Transmission des connaissances dans les relations de coopération inter-entreprises : TIC versus Brest Cedex 3 Mots-clés : TIC, face à face, transmission des connaissances, coopération inter les relations de coopération inter-entreprises : TIC versus face-à-face Knowledge transmission

Paris-Sud XI, Université de

305

On a Hybrid RANS/LES Approach for Indoor Airflow Modeling  

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, Accepted by HVAC&R Research. #12;2 Smagorinsky-Lilly model SYMBOLS A = Model constant * l = No = Pressure wd = Distance to the nearest wall ijS = Strain rate tensor G = Filter function for LES t = Turbulence quantities OVERBARS Over bar = Mean and filtered flow variables for RANS and LES respectively

Chen, Qingyan "Yan"

306

Les lHa srin sde brgyad et le probleme de leur categorisation - Une interpretation  

E-Print Network (OSTI)

entre les maîtres de maison, au moment des offrandes auxklu et aux bcan dans les jardins : le soin mis à offrir des coupelles de lait etdes lampes à huile était, d’une certaine façon, destiné autant à nourrir lesdivinités souterraines hantant l...

Steinmann, Brigitte

2003-01-01T23:59:59.000Z

307

Les associations dans le systme sanitaire et social en France : des territoires de l'invisible.  

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Les associations dans le système sanitaire et social en France : des territoires de l'invisible nébuleuse d'associations moins structurées et peu repérables qui forment des « territoires de l'invisible structured and not much discernible, which forms "spaces of the invisible". LA SANTE, LE SOCIAL ET LES

Paris-Sud XI, Université de

308

Revue mditerrane n3-4 2008 Les ports-frontires de Trieste, Koper et Rijeka, futurs dbouchs pour les conteneurs  

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1 Revue méditerranée n°3-4 2008 Les ports-frontières de Trieste, Koper et Rijeka, futurs débouchés marchés se dessinent naturellement pour les ports du nord-est de la Mer Adriatique, Trieste (Italie Suez. Si la création des trois ports est directement liée à l'éclatement politique de la péninsule

Paris-Sud XI, Université de

309

La fonction dambulatoire des lieux marchands intrieurs Les relations entre le commerce de dtail et les mobilits en ville ont t analyses par la  

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La fonction déambulatoire des lieux marchands intérieurs Les relations entre le commerce de détail ; Desse, 2001). Dans les travaux portant sur l'accessibilité des espaces marchands, la mobilité est'espaces marchands une part importante du déplacement des consommateurs se déroule dans leurs intérieurs, selon une

Paris-Sud XI, Université de

310

LES REVUES D'EXCELLENCE EN ECONOMIE ET EN GESTION : DISCORDANCES ENTRE LA CLASSIFICATION DE L'AERES ET LES FACTEURS  

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1 LES REVUES D'EXCELLENCE EN ECONOMIE ET EN GESTION : DISCORDANCES ENTRE LA CLASSIFICATION DE L'AERES novembre 2009 En 2008, l'agence d'évaluation de la recherche et de l'enseignement supérieur (AERES 109 revues parmi les 594 (18%) revues classées A, B ou C par l'AERES ont des facteurs d'impact par

Paris-Sud XI, Université de

311

CFD validation in OECD/NEA t-junction benchmark.  

SciTech Connect

When streams of rapidly moving flow merge in a T-junction, the potential arises for large oscillations at the scale of the diameter, D, with a period scaling as O(D/U), where U is the characteristic flow velocity. If the streams are of different temperatures, the oscillations result in experimental fluctuations (thermal striping) at the pipe wall in the outlet branch that can accelerate thermal-mechanical fatigue and ultimately cause pipe failure. The importance of this phenomenon has prompted the nuclear energy modeling and simulation community to establish a benchmark to test the ability of computational fluid dynamics (CFD) codes to predict thermal striping. The benchmark is based on thermal and velocity data measured in an experiment designed specifically for this purpose. Thermal striping is intrinsically unsteady and hence not accessible to steady state simulation approaches such as steady state Reynolds-averaged Navier-Stokes (RANS) models.1 Consequently, one must consider either unsteady RANS or large eddy simulation (LES). This report compares the results for three LES codes: Nek5000, developed at Argonne National Laboratory (USA), and Cabaret and Conv3D, developed at the Moscow Institute of Nuclear Energy Safety at (IBRAE) in Russia. Nek5000 is based on the spectral element method (SEM), which is a high-order weighted residual technique that combines the geometric flexibility of the finite element method (FEM) with the tensor-product efficiencies of spectral methods. Cabaret is a 'compact accurately boundary-adjusting high-resolution technique' for fluid dynamics simulation. The method is second-order accurate on nonuniform grids in space and time, and has a small dispersion error and computational stencil defined within one space-time cell. The scheme is equipped with a conservative nonlinear correction procedure based on the maximum principle. CONV3D is based on the immersed boundary method and is validated on a wide set of the experimental and benchmark data. The numerical scheme has a very small scheme diffusion and is the second and the first order accurate in space and time, correspondingly. We compare and contrast simulation results for three computational fluid dynamics codes CABARET, Conv3D, and Nek5000 for the T-junction thermal striping problem that was the focus of a recent OECD/NEA blind benchmark. The corresponding codes utilize finite-difference implicit large eddy simulation (ILES), finite-volume LES on fully staggered grids, and an LES spectral element method (SEM), respectively. The simulations results are in a good agreement with experimenatl data. We present results from a study of sensitivity to computational mesh and time integration interval, and discuss the next steps in the simulation of this problem.

Obabko, A. V.; Fischer, P. F.; Tautges, T. J.; Karabasov, S.; Goloviznin, V. M.; Zaytsev, M. A.; Chudanov, V. V.; Pervichko, V. A.; Aksenova, A. E. (Mathematics and Computer Science); (Cambridge Univ.); (Moscow Institute of Nuclar Energy Safety)

2011-08-23T23:59:59.000Z

312

Etude de la modulation de la réponse cellulaire au stress oxydatif par les protéines VP24 des virus Marburg et Ebola.  

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??Les virus Ebola (EBOV) et Marburg (MARV) causent des fièvres hémorragiques chez les primates, y compris l’homme. Le taux de létalité peut atteindre 90% et… (more)

Page, Audrey

313

Etude de la modulation de la réponse cellulaire au stress oxydatif par les protéines VP24 des virus Marburg et Ebola.  

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??Les virus Ebola (EBOV) et Marburg (MARV) causent des fièvres hémorragiques chez les primates, y compris l'homme. Le taux de létalité peut atteindre 90% et… (more)

Page, Audrey

2012-01-01T23:59:59.000Z

314

1424 : Les navires de Calicut se dtournent d'Aden au profit de Djedda L'avnement d'une nouvelle route des pices  

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nakhudha, un mot arabe d'origine persane signifiant les « maîtres des navires ». Mentionnés dans les textes

Paris-Sud XI, Université de

315

Le financement des entreprises par les socits de capital de risque (SCR) est essentiel au dveloppement de l'conomie. Ce financement s'adresse tous les types d'entreprises et ce  

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Le financement des entreprises par les sociétés de capital de risque (SCR) est essentiel au leurs impacts sur les entreprises, et d'outiller les gestionnaires des SCR pour le choix de leurs d'investissement des SCR de la sélection des projets jusqu'au retrait. Lorsqu'une SCR décide d

Spino, Claude

316

Spécification technique des stations de pompage pour les faisceaux secondaires des Zones Expérimentales du synchroton de 300 GeV  

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Spécification technique des stations de pompage pour les faisceaux secondaires des Zones Expérimentales du synchroton de 300 GeV

Coet, P

1975-01-01T23:59:59.000Z

317

Etre rom en Bulgarie : les dangers d'une essentialisation de l'altrit Nadge Ragaru1  

E-Print Network (OSTI)

1 Etre rom en Bulgarie : les dangers d'une essentialisation de l'altérité Nadège Ragaru1 Dans les imaginaires sociaux, les Roms relèvent tour à tour d'une vision exotisante et de l'ostracisme. Qu'il s'abord, elle enferme les Roms dans une figuration contrainte de la marginalité ou de l'errance, incapable d

Paris-Sud XI, Université de

318

Posters  

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1 1 Posters Development of a Scheme for Parameterizing the Effects of Cloud Condensation Nuclei on Stratocumulus Cloud Albedo W. R. Cotton, B. Stevens, D. Duda, and G. L. Stephens Colorado State University Department of Atmospheric Science Fort Collins, Colorado * Drizzle formation is a complicated function of the CCN spectra, especially giant and ultra-giant aerosol, cloud liquid water contents, mixing processes, and the time scales of cloud drafts which are determined by the strengths and depths of cloud drafts. Approach Our approach is to produce large eddy simulations (LES) or cloud-resolving models (CRMs) of marine stratocumulus clouds including the use of bin-resolving aerosol and cloud microphysics. The model is designed to obtain an internally consistent coupling between stratocumulus cloud dynamics

319

X:\ARM_19~1\P225-243.WPD  

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

5 5 Development and Testing of an Aerosol-Stratus Cloud Parameterization Scheme for Middle and High Latitudes P. Q. Olsson, M. P. Meyers, S. Kreidenweis, and W. R. Cotton Department of Atmospheric Science Colorado State University Fort Collins, Colorado Introduction The aim of this new project is to develop an aerosol/cloud microphysics parameterization of mixed-phase stratus and boundary layer clouds. Our approach is to create, test, and implement a bulk-microphysics/aerosol model using data from Atmospheric Radiation Measurement (ARM) Cloud and Radiation Testbed (CART) sites and large-eddy simulation (LES) explicit bin-resolving aerosol/micro- physics models. The primary objectives of this work are twofold. First, we need the prediction of number con- centrations of activated aerosol which are transferred to the

320

1  

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Factors Controlling the Properties of Multi-Phase Factors Controlling the Properties of Multi-Phase Arctic Stratocumulus Clouds A. Fridlind and A. Ackerman National Aeronautics and Space Administration - Ames Research Center Moffett Field, California S. Menon and I. Sednev Lawrence Berkeley National Laboratory Berkeley, California Introduction The October 2004 Multi-Phase Arctic Cloud Experiment (M-PACE) Intensive Operational Period (IOP) at the Atmospheric Radiation Measurement (ARM) Climate Research Facility's (ACRF's) North Slope of Alaska (NSA) locale focused on measuring the properties of autumn transition-season arctic stratus and the environmental conditions controlling them, including concentrations of heterogeneous ice nuclei. Our work aims to use a large-eddy simulation (LES) code with embedded size-resolved cloud

Note: This page contains sample records for the topic "large-eddy simulation les" from the National Library of EnergyBeta (NLEBeta).
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321

ARM - Publications: Science Team Meeting Documents  

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A Satellite Cloud, Radiation and Precipitation Data Set for Cloud Model A Satellite Cloud, Radiation and Precipitation Data Set for Cloud Model Evaluation Xu, K.-M.(a), Wielicki, B.A.(a), Wong, T.(a), and Randall, D.A.(b), NASA Langley Research Center (a), Colorado State University (b) Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting To systematically evaluate cloud models including large-eddy simulation (LES), cloud-resolving models (CRMs), cloud parameterizations in general circulation models (GCMs), one needs a large set of cloud, radiation and precipitation data that are matched with simultaneous atmospheric state data. We have been using a technique to produce such a data set at the NASA Langley Research Center. Specifically, this technique classifies EOS (Earth Observing System) satellite data into distinct cloud systems or "cloud

322

1  

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Improving the Representation of Aerosol-Cloud- Improving the Representation of Aerosol-Cloud- Precipitation Interactions in Numerical Models D.B. Mechem and Y.L. Kogan Cooperative Institute for Mesoscale Meteorological Studies University of Oklahoma Norman, Oklahoma Introduction Accurately representing aerosol indirect effects in large-scale numerical models requires microphysical parameterizations that treat complex aerosol-cloud-precipitation interactions in a realistic manner. Here we address two important aspects of these microphysical interactions: 1. Development of a new parameterization of giant cloud condensation nuclei (CCN) for use in bulk microphysical models; 2. Aspects of droplet nucleation revealed by 3D large eddy simulation (LES) results but not captured by nucleation schemes based on simple empirical relations or 1D parcel models

323

Categorical Exclusion Determinations: National Energy Technology Laboratory  

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

September 18, 2013 September 18, 2013 CX-010933: Categorical Exclusion Determination High Energy Density Lithium (Li)-ion Cells for Electric Vehicles (EV) Based on Novel, High Voltage Cathode Material Systems CX(s) Applied: B3.6 Date: 09/18/2013 Location(s): California Offices(s): National Energy Technology Laboratory September 18, 2013 CX-010932: Categorical Exclusion Determination High Energy Density Lithium (Li)-ion Cells for Electric Vehicles (EV) Based on Novel, High Voltage Cathode Material Systems CX(s) Applied: B3.6 Date: 09/18/2013 Location(s): California Offices(s): National Energy Technology Laboratory August 23, 2013 CX-010779: Categorical Exclusion Determination Predictive Large Eddy Simulation (LES) Modeling and Validation for High-Pressure Turbulent Flames and Flashback in Hydrogen-Enriched Gas

324

Page not found | Department of Energy  

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

21 - 13630 of 26,764 results. 21 - 13630 of 26,764 results. Download CX-010778: Categorical Exclusion Determination Technology Integration Program CX(s) Applied: A9, A11 Date: 08/23/2013 Location(s): Oklahoma Offices(s): National Energy Technology Laboratory http://energy.gov/nepa/downloads/cx-010778-categorical-exclusion-determination Download CX-010779: Categorical Exclusion Determination Predictive Large Eddy Simulation (LES) Modeling and Validation for High-Pressure Turbulent Flames and Flashback in Hydrogen-Enriched Gas Turbine CX(s) Applied: A9, B3.6 Date: 08/23/2013 Location(s): Texas Offices(s): National Energy Technology Laboratory http://energy.gov/nepa/downloads/cx-010779-categorical-exclusion-determination Download CX-010780: Categorical Exclusion Determination Advanced Analytical Methods for Air and Stray Gas Emissions and Produced

325

Modeling Turbulent Flow  

National Nuclear Security Administration (NNSA)

Turbulent Turbulent Flow with Implicit LES L.G. Margolin 1 Proceedings of the Joint Russian-American Five Laboratory Conference on Computational Mathematics/Physics 19-23 June, 2005 Vienna, Austria 1 Applied Physics Division, Los Alamos National Laboratory, Los Alamos, NM 87545, len@lanl.gov 1 Abstract Implicit large eddy simulation (ILES) is a methodology for modeling high Reynolds' num- ber flows that combines computational efficiency and ease of implementation with predictive calculations and flexible application. Although ILES has been used for more than fifteen years, it is only recently that significant effort has gone into providing a physical rationale that speaks to its capabilities and its limitations. In this talk, we will present new theoret- ical results aimed toward building a justification and discuss some remaining gaps in our understanding and our practical

326

Research Highlight  

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

Measurement of Convective Entrainment Using Lagrangian Particles Measurement of Convective Entrainment Using Lagrangian Particles Download a printable PDF Submitter: Romps, D., University of California, Berkeley Area of Research: Cloud Processes Working Group(s): Cloud Life Cycle Journal Reference: Yeo K and DM Romps. 2013. "Measurement of convective entrainment using Lagrangian particles." Journal of the Atmospheric Sciences, 70(1), doi:10.1175/JAS-D-12-0144.1. Trajectories of seven particles that are entrained at the cloud base and transported to the cloud top. Colors denote the mixing ratio of condensed water. Previous work by Romps (2010) found large entrainment rates of ~100% per kilometer for deep convection using a new technique for large-eddy simulations (LES) called "Eulerian direct measurement". These results

327

Feuilletages transversalement projectifs sur les vari'et'es de Thierry Barbot, C.N.R.S  

E-Print Network (OSTI)

les flots g'eod'esiques des surfaces riemanniennes `a courbure n'egative constante, ­ les feuilletages horocycliques associ'es aux feuilletages g'eod'esiques ci­dessus. Remarquons que tous ces exemples (`a part les feuilletages g'eod'esiques convexes, et feuilletages horocycliques projectifs. 1 #12; Le cas des suspensions

Zeghib, Abdelghani

328

Building Performance Simulation  

E-Print Network (OSTI)

Y (2008). DeST—An integrated building simulation toolkit,Part ? : Fundamentals. Building Simulation, 1: 95 ? 110.Y (2008). DeST—An integrated building simulation toolkit,

Hong, Tianzhen

2014-01-01T23:59:59.000Z

329

Les troubles de la personnalité dans le DSM-5  

Science Journals Connector (OSTI)

Résumé La présentation retrace les principales étapes de la révision du chapitre des troubles de la personnalité dans le DSM-5. Après un rappel des travaux préparatoires, l’auteur résume les travaux du groupe de travail présidé par Andrew Skodol qui a abouti à des recommandations initiales présentées en février 2010. Celles-ci, originales pour la plupart, ont fait l’objet de vives oppositions. Le nouveau modèle proposé, hybride, catégoriel et dimensionnel, n’a pas été accepté par l’Association américaine de psychiatrie, du moins dans la section II, cœur de la classification. L’Association a opté en revanche pour la conservation intégrale des catégories et des critères du DSM-IV. Le modèle alternatif figure cependant dans la section III, dans l’attente d’études complémentaires. Celles-ci sont indispensables pour pouvoir confirmer la validité des dimensions et des facettes retenues, la stabilité de leur structure factorielle et leur intérêt clinique. La suppression du système multiaxial est une autre décision majeure. Les troubles de la personnalité sont désormais des troubles mentaux « Comme les autres », éventualité qui avait fait l’objet de vives critiques par le passé. Abstract This presentation summarizes the revision process in preparing DSM-5 for personality disorders. The preliminary steps were The Research Agenda for DSM-5 published by D Kupfer et al. in 2002 and the APA/NIH Conference on Dimensional Models of Personality Disorders (Arlington, 12.01.2004) published in 2006 by T Widiger et al. DSM-IV categories showed excessive comorbidities and within- diagnosis heterogeneity, temporal instability and poor convergent and discriminant validity. The workgroup on personality and personality disorders chaired by Andrew Skodol has been working since 2007. The initial recommendations were published online on February 10, 2010. A major reconceptualization of personality disorders has been proposed by the workgroup with five severity levels of personality functioning based on degrees of impairment in core self and interpersonal capacities. A reduction in the number of categories (5) was expected to reduce the comorbidities and the replacement of some behavioral criteria by traits in 6 broad domains was expected to result in a better coverage and temporal stability. This new model did not receive a real approval from the American Psychiatric Association. The final decisions consist in the removal of the multiaxial perspective and the maintenance of DSM-IV personality disorders categories and criteria in DSM-5 Section II. The alternative hybrid model was placed in Section III with five domains and 25 trait facets. More validation studies are needed for the Personality Inventory for DSM-5 (PID-5) from R. Krueger (stability of factorial structure in psychiatric samples and concurrent validity with the new version of NEO PI-R (NEO 3).

Julien Daniel Guelfi

2014-01-01T23:59:59.000Z

330

Digestion Simulations  

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

Digestion Simulations Digestion Simulations Name: Lisa Location: N/A Country: N/A Date: N/A Question: My 5th grade students are beginning an experiment next week and their hypothesis involves edibility(edibleness?). Is there a way to replicate the stomach in, say, a bottle?? Are there ways to test for edibleness(?) without actually ingesting the experiment yourself? Replies: I would not recommend the idea of a bottle stomach. The stomach digests only proteins anyway with HCl [pH 1.0] which is very, very strong acid that will burn seriously if in contact with skin. The intestine is just as much responsible for digestion of lipids [bile], carbohydrates and remaining proteins using enzymes, many of these you do not want to be handling, let alone purchase. As a high school teacher, I have lab exercises dealing with digestion, but I can not recommend any of these unless you are set up with a functional science laboratory and all the safety equipment necessary.

331

Multi-dimensional Longwave Forcing of Boundary Layer Cloud Systems  

SciTech Connect

The importance of multi-dimensional (MD) longwave radiative effects on cloud dynamics is evaluated in a large eddy simulation (LES) framework employing multi-dimensional radiative transfer (Spherical Harmonics Discrete Ordinate Method —SHDOM). Simulations are performed for a case of unbroken, marine boundary layer stratocumulus and a broken field of trade cumulus. “Snapshot” calculations of MD and IPA (independent pixel approximation —1D) radiative transfer applied to LES cloud fields show that the total radiative forcing changes only slightly, although the MD effects significantly modify the spatial structure of the radiative forcing. Simulations of each cloud type employing MD and IPA radiative transfer, however, differ little. For the solid cloud case, relative to using IPA, the MD simulation exhibits a slight reduction in entrainment rate and boundary layer TKE relative to the IPA simulation. This reduction is consistent with both the slight decrease in net radiative forcing and a negative correlation between local vertical velocity and radiative forcing, which implies a damping of boundary layer eddies. Snapshot calculations of the broken cloud case suggest a slight increase in radiative cooling, though few systematic differences are noted in the interactive simulations. We attribute this result to the fact that radiative cooling is a relatively minor contribution to the total energetics. For the cloud systems in this study, the use of IPA longwave radiative transfer is sufficiently accurate to capture the dynamical behavior of BL clouds. Further investigations are required in order to generalize this conclusion for other cloud types and longer time integrations. 1

Mechem, David B.; Kogan, Y. L.; Ovtchinnikov, Mikhail; Davis, Anthony B; Evans, K. F.; Ellingson, Robert G.

2008-12-20T23:59:59.000Z

332

F. Flipo, Les ingalits cologiques et sociales : l'apport des thories de la justice, Mouvements, n60, octobre-dcembre 2009, pp. 59-76.  

E-Print Network (OSTI)

, social, theories of justice, philosophy, inequalities. Introduction Amartya Sen a montré que toutes les

Paris-Sud XI, Université de

333

E-Print Network 3.0 - avec les esprits Sample Search Results  

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

esprits Search Powered by Explorit Topic List Advanced Search Sample search results for: avec les esprits Page: << < 1 2 3 4 5 > >> 1 GrgoireSchlemmer Jeuxd'esprits Summary:...

334

E-Print Network 3.0 - avec les resultats Sample Search Results  

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

matriciel TP 2 Systemes d'equations lineaires Summary: analytiquement, puis avec Matlab. Comparer les resultats. Calculer u null(A) et v null(A, 'r') (A est la... ...

335

Les réfugiés congolais au Gabon : modes de circulation et d'installation dans un espace frontalier.  

E-Print Network (OSTI)

??Le Gabon, pays d'immigration depuis la colonisation a appris à accueillir les réfugiés depuis 1968 avec l'arrivée des enfants biafrais du Nigeria. Il a ensuite… (more)

Wali Wali, Christian

2010-01-01T23:59:59.000Z

336

E-Print Network 3.0 - architecture les etapes Sample Search Results  

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

Search Powered by Explorit Topic List Advanced Search Sample search results for: architecture les etapes Page: << < 1 2 3 4 5 > >> 1 Bases de Donnes -TD6 Licence Informatique...

337

Revue sur les mthodes de dosage de la lignine utilises en alimentation animale  

E-Print Network (OSTI)

Revue sur les méthodes de dosage de la lignine utilisées en alimentation animale Sylvie GIGER I 75231 Paris Cedex 05 Résumé La lignine est un composé pariétal de nature non glucidique dont la lignine dans le contexte de l'alimentation animale sont rares. Avec les données actuellement disponibles

Paris-Sud XI, Université de

338

Les territoires viticoles, entre espace d'innovation et innovation d'espaces  

E-Print Network (OSTI)

�t�rog�nes. En effet les diff�rentes r�gions, AOC, ou IGP n'acc�dent pas de la m�me mani�re au march� globalis terroir et territoire. En nous basant sur diff�rents territoires d'�tude (AOC Banyuls Collioure, diffusion'observations et d'entretiens sur deux terrains d'�tudes (Fig. 1) : L'AOC du cru Banyuls d'une part et les d

Boyer, Edmond

339

ABSORPTION INFRA-ROUGE DANS LES ALLIAGES NORMAUX Par B. CAROLI (1),  

E-Print Network (OSTI)

884. ABSORPTION INFRA-ROUGE DANS LES ALLIAGES NORMAUX Par B. CAROLI (1), Résumé. - L'absorption de'électrons de Bloch, par une méthode quantique. On en déduit pour les fréquences faibles un coefficient d'absorption sont estimées sur un exemple simple. Abstract. 2014 Infra-red absorption by dilute alloys is studied

Boyer, Edmond

340

Les Roms ? Ils ne sont pas encore prts se reprsenter eux-mmes !  

E-Print Network (OSTI)

401 « Les Roms ? Ils ne sont pas encore prêts à se représenter eux-mêmes ! » Les tensions entre groupes Roms et associations « gadjé » à Milan Tommaso VITALE et Laura BOSCHETTI Centre d en rectangle, la réunion du Tavolo Rom, la « Table Rom », a lieu un lundi sur deux à 18 h 00. Cela

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "large-eddy simulation les" 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

Neurobiologie molculaire et cellulaire, Neurophysiologie Prsence des lus C dans les visites AERES de laboratoire  

E-Print Network (OSTI)

dans les visites AERES de laboratoire La section 25 du comité national, lors de sa première réunion du nouveau mandat, demande par cette motion à la direction du CNRS d'insister auprès de l'AERES pour que soit, président de l'AERES - Patrick BLADER, Laurent GROC et Dominique JOB, Délégués scientifiques pour les

van Tiggelen, Bart

342

Rfrigration solaire par simulation en absorption sche J. Flchon et F. Machizaud  

E-Print Network (OSTI)

tracé dans une précédente publication [4] le réseau (1/T, Log P) du couple frigorigène CaCl2-NH3 pour, Log P) of the frigorigene couple CaCl2-NH3 for different concentrations in ammonia, by simulation we. Parmi les couples susceptibles d'un emploi efficace, CaCl2, NH3 a fait l'objet de réalisations

Boyer, Edmond

343

Recalage sur les contours et recalage sur les rgions pour l'acquisition 3D des gestes en temps rel par vision monoscopique  

E-Print Network (OSTI)

régions, recalage sur les contours, recalage 3D/2D. Abstract We focus on 3D human motion capture by real on computing power available. Keywords 3D motion capture, monocular vision, region matching, edges matching, 3D

Paris-Sud XI, Université de

344

Mise en place du systme de TMA dans les croles du Surinam : dveloppement interne ou contact de langues1 ?  

E-Print Network (OSTI)

1 Mise en place du système de TMA dans les créoles du Surinam : développement interne ou contact de anglaise du Surinam, et du ndyuka en particulier, montre une régularité à la fois dans les formes et dans différentes époques de contact. Les créoles de base lexicale anglaise du Surinam, résultat du contact entre

Paris-Sud XI, Université de

345

Th`eor`eme de Paley-Wiener pour les fonctions de Whittaker sur un groupe reductif p-adique  

E-Print Network (OSTI)

Th`eor`eme de Paley-Wiener pour les fonctions de Whittaker sur un groupe r´eductif p-adique Patrick transform´ee de Fourier pour cet espace et d'en caract´eriser l'image. Ce Th´eor`eme est l'analogue pour les fonctions de Whittaker du Th´eor`eme de Paley-Wiener pour les fonctions sur le groupe, du `a Joseph

Paris-Sud XI, Université de

346

Les opportunités de la technologie CSP « concentrating solar power » dans la génération d'électricité renouvelable en Algérie.  

E-Print Network (OSTI)

??172 p. : ill. ; 30 cm Les énergies renouvelables constituent une alternative aux énergies fossiles. Elles contribuent à répondre aux besoins énergétiques actuels et… (more)

Bourezg-Dellili, Sabiha

2013-01-01T23:59:59.000Z

347

Pour une anthropologie anarchiste des techniques du corps dans la sorcellerie sportive : le Mesing chez les Fang du Gabon.  

E-Print Network (OSTI)

??Cette thèse porte sur une analyse diachronique du rapport entre l'anarchisme, les techniques du corps sorcellerie dans la pratique du Mesing et arts martiaux au… (more)

Nguema Akwe, Olivier p

2013-01-01T23:59:59.000Z

348

Pour citer cet article Soraya Boudia, Naissance, extinction et rebonds d'une controverse scientifique : les dangers  

E-Print Network (OSTI)

trouve à 160 km environ au nord-est de l'atoll Bikini dans les Iles Marshall, soit en dehors de la zone

Paris-Sud XI, Université de

349

LE CALENDRIER MAYA Du XVIe au XIXe sicle, la domination exerce par les Espagnols sur la plus grande  

E-Print Network (OSTI)

par le terme wooj) s'étend également sur les �tats avoisinants de Chiapas et Tabasco, sur le Guatemala

Boyer, Edmond

350

Mixed Mode Simulation Tools  

E-Print Network (OSTI)

ANSYS CFX, ANSYS Fluent, Autodesk Simulation CFD (formerly CFDesign), Autodesk Vasari, FloVENT, Flowdesigner,

Gandhi, Priya; Brager, Gail; Dutton, Spencer

2014-01-01T23:59:59.000Z

351

05/08/2011 12:30Pour la Science -Actualit -Les mles obsoltes Page 1 of 2http://www.pourlascience.fr/ewb_pages/a/actualite-les-males-obsoletes-27571.php  

E-Print Network (OSTI)

.pourlascience.fr/ewb_pages/a/actualite-les-males-obsoletes-27571.php © V. Cavale Une cochenille australienne (Icerya purchasi). POUR EN SAVOIR PLUS A. Gardner et Lhttp://www.pourlascience.fr/ewb_pages/a/actualite-les-males-obsoletes-27571.php Réagir à cet article

Gardner, Andy

352

Robot Hardware Simulator  

E-Print Network (OSTI)

Robotics Simulator is to perform simulations of many heterogeneous types of robots all working within a single, virtual environment. The main components of this project are Robot Simulator, Environment Control Panel and Environment Simulator. Robot simulator consists of three parts: a robot hardware simulator, a robot control program, which will be user supplied, and an environment-based robot object. Robot control program can work with various robot hardware simulators via standard API. The robot hardware simulator will interface to the environment via requests for data from its sensor or requests for action from its actuators. The environment-based robots will be responsible for controlling the individual sensors, based on robot hardware simulator requests, and providing the appropriate data to the sensors, Environment control panel will be a standalone system that connects to the environment simulator to monitor and control the current simulation The environment simulator is the central component in the system. The environment simulator is responsible for keeping track of the actual state of the environment, including each robot. The environment simulator receives requests from simulated robots to read sensors, initiate actuators, and to send and receive communication.

unknown authors

353

Sur les germes de fonctions holomorphes a lieu singulier de dimension 1: le cas general.  

E-Print Network (OSTI)

.1 Le th´eor`eme de b-1 -r´egularit´e. . . . . . . . . . . . . . . . . . . . . 4 2.2 Estimation de G´en´eralise les points cruciaux des th´eor`emes 4.3.1 et 4.3.2 de [B.06]. Th´eor`eme 1.1.1 Soit f un germe de un ouvert non vide de V est nulle. hal-00124034,version1-12Jan2007 #12;Hypersurfaces III. 3 Les th´eor

Boyer, Edmond

354

ans cette puissance rgio-qu'est l'Iran, les don-  

E-Print Network (OSTI)

EDITORIAL ans cette puissance régio- nale1 qu'est l'Iran, les don- nées démographiques met- tent en diversité ethnique et religieuse d'un pays qui passe souvent pour homogène. En effet, les périphéries de l'Iran majorité perse. � l'extrême sud-est, le peuplement de l'Iran comprend des baloutches (Province du Sistan

Paris-Sud XI, Université de

355

Institut Farman : Appel projets 2014 Les projets peuvent prendre plusieurs formes : jeunes chercheurs, lancement d'une nouvelle ide,  

E-Print Network (OSTI)

Institut Farman : Appel à projets 2014 Les projets peuvent prendre plusieurs formes : jeunes). - Version « Industrielle » (1 labo/1 industriel) : projet impliquant un laboratoire Farman et un partenaire que le(s) laboratoire(s) Farman participant. La durée typique des projets est de deux ans (à compter

356

Institut Farman : Appel projets 2013 Les projets peuvent prendre plusieurs formes : jeunes chercheurs, lancement d'une nouvelle ide,  

E-Print Network (OSTI)

Institut Farman : Appel à projets 2013 Les projets peuvent prendre plusieurs formes : jeunes). - Version « Industrielle » (1 labo/1 industriel) : projet impliquant un laboratoire Farman et un partenaire que le(s) laboratoire(s) Farman participant. La durée typique des projets est de deux ans (à compter

357

Dveloppement de l'usage des TICE et de leur utilisabilit dans les CFA du secteur automobile  

E-Print Network (OSTI)

Développement de l'usage des TICE et de leur « utilisabilité » dans les CFA du secteur automobile formation professionnelle dans le secteur de l'automobile, qui entre dans sa quatrième année. Les effets de systems in professional training; teachers training; diffusion and change management. Le contexte L'automobile

Paris-Sud XI, Université de

358

Dioxine dans les MIOM. Teneurs observees et etude preliminaire de leur potentiel de transfert vers l'environnement  

E-Print Network (OSTI)

2001-81 Dioxine dans les MIOM. Teneurs observees et etude preliminaire de leur potentiel de dioxines/furannes dans les Mächefers d'incineration d'Ordures Menageres valorises en travaux routiers des dioxines/furannes des MIOM valorises en travaux routiers est tres limite. 1. INTRODUCT10N De

Paris-Sud XI, Université de

359

THEOREMES DE BASSE ENERGIE ET REACTIONS PHOTO-PIONIQUES SUR LES NOYAUX J. DELORME, M. ERICSON et A. FIGUREAU  

E-Print Network (OSTI)

. The application of low energy theorems to nuclear photopion reactions in here displayed Various experimental testsTHEOREMES DE BASSE ENERGIE ET REACTIONS PHOTO-PIONIQUES SUR LES NOYAUX J. DELORME, M. ERICSON et A;THEOREMES DE BASSE ENERGIE E T REACTIONS PHOTO-PIONIQUES SUR LES NOYAUX constantes de ccuplage ou facteurs

Boyer, Edmond

360

Les engins et techniques de pche utiliss dans la baie de Loango, Rpublique du Congo, et leurs incidences sur les prises accessoires  

E-Print Network (OSTI)

Les engins et techniques de p�che utilis�s dans la baie de Loango, R�publique du Congo, et leurs diamants, 75013 Paris. (2) r�natura Congo, bP 414, Pointe noire, r�publique du Congo. [helenedembe�publique du Congo. * Corresponding author [agirard6@gmail.com] selon des statistiques de 2011, pr�s de 30% des

Girondot, Marc

Note: This page contains sample records for the topic "large-eddy simulation les" 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

L'AutRE RIVE : LES IRAnIEnS Aux MIRAtS ARAbES unIS, EntRE VISIbILIt Et  

E-Print Network (OSTI)

OpOLItIquE Les pérégrinations entre les deux côtes, arabe et persane, ont marqué la vie des villes concernées

Boyer, Edmond

362

Cellules NK et fièvres hémorragiques virales : étude de leur rôle dans la mise en place des réponses immunes et dans la pathogenèse lors de l'infection par les virus Lassa et Ebola.  

E-Print Network (OSTI)

??Les fièvres hémorragiques à virus Lassa (LASV) et Ebola (EBOV) représentent un important problème de santé publique en Afrique. Les réponses immunes et la pathogenèse… (more)

Russier, Marion

2013-01-01T23:59:59.000Z

363

Cellules NK et fièvres hémorragiques virales : étude de leur rôle dans la mise en place des réponses immunes et dans la pathogenèse lors de l'infection par les virus Lassa et Ebola.  

E-Print Network (OSTI)

??Les fièvres hémorragiques à virus Lassa (LASV) et Ebola (EBOV) représentent un important problème de santé publique en Afrique. Les réponses immunes et la pathogenèse… (more)

Russier, Marion

364

Dynamic Positioning Simulator Dynamic Positioning Simulator  

E-Print Network (OSTI)

Simulator 5 / 24 #12;Dynamic Positioning Simulator Dynamic Positioning Why Dynamic Positioning? Advantages Dynamic Positioning: No tugboats needed; Offshore set-up is quick; Power saving; Precision situations more on Ship: Wind Force Fw = 1 2 air V 2 rw CXw (rw )AT 1 2 air V 2 rw CYw (rw )AL Mw = 1 2 air V 2 rw CMw (rw

Vuik, Kees

365

Paru dans Lignes n 34, L'exemple des Roms. Les Roms, pour l'exemple (coord. Ccile Canut), pp. 161-178.  

E-Print Network (OSTI)

1 Paru dans Lignes n� 34, � L'exemple des Roms. Les Roms, pour l'exemple � (coord. C�cile Canut direction des migrants roms dans les villes fran�aises Olivier Legros, UMR Citeres-Emam, Universit� de Tours, Urba-Rom Dans les villes de province comme en banlieue parisienne, l'observation des actions publiques

Boyer, Edmond

366

A review of "La Rochefoucauld par quatre chemins. Les Maximes et leurs ambivalence" by Eric Turcat  

E-Print Network (OSTI)

82 seventeenth-century news Eric Turcat. La Rochefoucauld par quatre chemins. Les Maximes et leurs ambivalence. Biblio 17, v. 206. Tübingen: Gunter Narr Verlag, 2013. 220 pp. ISBN 978-63-8233-6803-8. $65.91. Review by denis d. grélé, university...

Grele, Denis D.

2014-01-01T23:59:59.000Z

367

Les Sances de la Socit prhistorique franaise sont des publications en ligne disponibles sur  

E-Print Network (OSTI)

bord de Seine : le site du 62 rue Henry-Farman à Paris (15e arrondissement). Organisation et -- Les microlithes du 62 rue Henry-Farman à Paris (15e arrondissement) : des flèches diverses pour prismatiques de type montmorencien : l'exemple du 62 rue Henry-Farman à Paris (15e arrondissement

368

J. PROKS. -LAIT On trouvera dans les livres de la mdecine humaine (1) des rensei-  

E-Print Network (OSTI)

enfants successifs est proportionnel à, la durée d'intervalle des grossesses. (A suiore.] LAIT D'ON GOUT'UN GOUT SAL� 353 Mais il en est tout autrement si les vaches sont soumises à une trop grande fatigue; un

Paris-Sud XI, Université de

369

On the Location of Energy Release and Temperature Pro les along Coronal Loops  

E-Print Network (OSTI)

temperature and the temperature distribution along the loop. In each case the ratio between the heat deposited and radiation provides a scaling for the summit temperature. Keywords: methods: Numerical - MHD - sun: corona;les of the energy release are then used to in- vestigate the temperature distribution along a loop.

Mackay, Duncan

370

Croissance dmographique, pression foncire et insertion territoriale par les abattis en Guyane franaise  

E-Print Network (OSTI)

(Suriname, Brésil, Haïti, etc.). L'augmentation continue de la population entraîne une pression foncière et provenance notamment du Suriname s'appuient sur les abattis pour avoir un ancrage territorial afin de s neighbours (Surinam, Brazil, Haiti, etc). The continuous increase of population involves land pressure since

Boyer, Edmond

371

An analytic formula for Macdonald polynomials Une formule analytique pour les polynomes de Macdonald  

E-Print Network (OSTI)

An analytic formula for Macdonald polynomials Une formule analytique pour les polynâ??omes de Macdonald Michel Lassalle and Michael Schlosser 5 mai 2003 Abstract We give the explicit analytic development of any Jack or Macdonald polynomial in terms of elementary (resp. modified complete) symmetric

Schlosser, Michael

372

RVERSIBILIT ET IRRVERSIBILIT EN RSONANCE NUCLAIRE THORIE DE LA RELAXATION NUCLAIRE DANS LES LIQUIDES  

E-Print Network (OSTI)

d6duire de 1'6quation de Schrodinger les equations « irréversibles par rapport au temps » qui qui satisfont a la relation (m'l V.L4 Vim) = 8(Em, - Em) fA(m) + (m'lg(A) 1m) (6) (ou A est un op6

Paris-Sud XI, Université de

373

L'ESSAIMAGE CHEZ LES HYPOTRIGONES AU GABON DYNAMIQUE DE QUELQUES POPULATIONS  

E-Print Network (OSTI)

L'ESSAIMAGE CHEZ LES HYPOTRIGONES AU GABON DYNAMIQUE DE QUELQUES POPULATIONS Das Schwärmen bei den YOUNG COLONIES The observations have been made in Gabon between 1963 and 1975. Thanks to the knowledge effectuées au Gabon entre 1963 et 1975. Grâce à la connaissance de divers paramètres caractéristiques de

Boyer, Edmond

374

Bruno Dupeyron et Eric Poinsot, chargs de recherche Les transformations organisationnelles dues  

E-Print Network (OSTI)

à l'introduction des nouvelles technologies de l'information et de la communication dans les ......................................................................................................................... 4 L'INTRANET DE LA CAISSE PRIMAIRE D'ASSURANCE MALADIE DE STRASBOURG ............... 10 Introduction ................................................................................................. 23 C- La montée en puissance de l'intranet

Paris-Sud XI, Université de

375

Quelques problmatiques pour clairer l'tude de l'information dans les organisations [1  

E-Print Network (OSTI)

'amplifier avec la montée des technologies à tous les niveaux de l'organisation. L'information dont il sera ou de production, et plus récemment, tous ces logiciels de groupware, de workflow, ou encore l'Intranet

Paris-Sud XI, Université de

376

IMPACT SUR LES SOLS DES DIOXINES DE MIOM UTILISES EN TECHNIQUE ROUTIERE  

E-Print Network (OSTI)

IMPACT SUR LES SOLS DES DIOXINES DE MIOM UTILISES EN TECHNIQUE ROUTIERE 1 R. BADREDDINE, 1 B teneurs de ces matériaux en PolyChloroDibenzo-para-Dioxines (PCDD) et PolyChloroDibenzoFuranes (PCDF) appelés communément "dioxines" et sur leur risque de transfert vers l'environnement. Une étude de cette

Paris-Sud XI, Université de

377

Theme: A: Restoration Thematic Session (LeS): ThS_A1: Footprint assessment  

E-Print Network (OSTI)

of this innovative technology is to enable the remediation of large brownfields areas, for which no real operationalTheme: A: Restoration Thematic Session (LeS): ThS_A1: Footprint assessment SUSTAINABLE REMEDIATION STRATEGIES: A MULTICRITERIA ANALYSIS TO SELECT AND COMPARE REMEDIATION TECHNIQUES IN A SUSTAINABILITY

Boyer, Edmond

378

Strodes sexuels et diagnostics de gestation chez les bovins — Tests en ferme  

E-Print Network (OSTI)

on the test pad compared to that on the control. There is a good agreement between the results of the RIA similar to that found by RIA. This kind of test used by the farmer, the Al technician or the clinicianStéroïdes sexuels et diagnostics de gestation chez les bovins — Tests en ferme M. THIBIER

Boyer, Edmond

379

Computational and experimental investigation of scour past laboratory models of stream restoration rock structures  

Science Journals Connector (OSTI)

Local scour of the streambed around three models of stream restoration rock structures, including a rock vane, a cross vane, and a J-hook vane, is investigated via laboratory experiments and numerical simulations. In the experimental study, a physical model of each rock structure is constructed via an assembly of rocks and installed in a straight mobile sand bed flume. Continuous bed topography measurements provide insight into the time evolution of the scour patterns downstream of the structures and yield comprehensive data sets for validating the numerical simulations in terms of scour patterns, maximum scour depths, and bar migration dynamics. The numerical simulations are carried out using the coupled, hydro-morphodynamic Curvilinear Immersed Boundary (CURVIB) method of Khosronejad et al. (2011) [17]. The mobile channel bed and the individual rocks comprising a stream restoration structure are discretized with an unstructured triangular mesh and treated as sharp-interface immersed boundaries embedded in the background curvilinear mesh used to discretize the flow domain. For each case, simulations are carried out solving both the unsteady Reynolds-averaged Navier–Stokes (URANS) equations closed with the k–? model and filtered Large-Eddy Simulation (LES) equations closed with the dynamic Smagorinski subgrid scale model. Both the URANS and LES models yield flow and scour patterns in reasonable agreement with the measurements with the LES results being consistently in better overall agreement with the measurements. To our knowledge, the present study is the first attempt to simulate local scour patterns around realistic model of stream restoration rock structures by taking into account and directly modeling their arbitrarily complex geometrical features.

Ali Khosronejad; Craig Hill; Seokkoo Kang; Fotis Sotiropoulos

2013-01-01T23:59:59.000Z

380

Progress in sub-grid scale modeling of shock-turbulence interaction  

SciTech Connect

The authors report on progress in the development of sub grid scale (SGS) closure relationships for the unresolved motion scales in compressible large eddy simulations (LES). At present they are refining the SGS model and overall LES procedure to include: a linearized viscoelastic model for finite thickness shock distortions and shocked turbulence field response; multiple scale asymptotic considerations to improve predictions of average near-wall surface behavior; and a spectral statistical model simulating the effects of high wave number stochastic feed-back from the unresolved SGS nonlinear motion influences on the explicitly resolved grid scale motions. Predicted amplification levels, modal energy partition, shock translational to turbulence kinetic energy transfer, and viscoelastic spatio-temporal response of turbulence to shock interaction are examined in comparison with available experimental evidence. Supplemental hypersonic compressible turbulence experimental information is developed from sub nanosecond interval pulsed shadowgraph evidence of laser impulse generated hypervelocity shocks interacting with intense, previously developed and carefully characterized initial turbulence. Accurate description of the influence of shock-turbulence interactions is vital for predicting their influence on: Supersonic/hypersonic flow field analysis, aerodynamic design, and aerostructural materials selection. Practical applications also include interior supersonic combustion analysis and combustion chamber design. It is also the essential foundation for accurately predicting the development and evolution of flow-field generated thermal and electromagnetic radiation important to hypersonic flight vehicle survivability, detection and communication.

Buckingham, A.C. [Lawrence Livermore National Lab., CA (United States). Center for Advanced Fluid Dynamics Applications; Grun, J. [Naval Research Lab., Washington, DC (United States). Plasma Physics Div.

1994-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "large-eddy simulation les" 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

CFD modeling of debris melting phenomena during late phase Candu 6 severe accident  

SciTech Connect

The objective of this paper was to study the phase change of the debris formed on the Candu 6 calandria bottom in a postulated accident sequence. The molten pool and crust formation were studied employing the Ansys-Fluent code. The 3D model using Large Eddy Simulation (LES) predicts the conjugate, radiative and convective heat transfer inside and from the corium pool. LES simulations require a very fine grid to capture the crust formation and the free convection flow. This aspect (fine mesh requirement) correlated with the long transient has imposed the use of a slice from the 3D calandria geometry in order not to exceed the computing resources. The preliminary results include heat transfer coefficients, temperature profiles and heat fluxes through calandria wall. From the safety point of view it is very important to maintain a heat flux through the wall below the CHF assuring the integrity of the calandria vessel. This can be achieved by proper cooling of the tank water which contains the vessel. Also, transient duration can be estimated being important in developing guidelines for severe accidents management. The debris physical structure and material properties have large uncertainties in the temperature range of interest. Thus, further sensitivity studies should be carried out in order to better understand the influence of these parameters on this complex phenomenon. (authors)

Nicolici, S.; Dupleac, D.; Prisecaru, I. [Univ. Politehnica of Bucharest, 313 Splaiul Independentei, 060042, Bucharest (Romania)

2012-07-01T23:59:59.000Z

382

Combustion Stability in Complex Engineering Flows | Argonne Leadership  

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

Instantaneous contours of temperature from large eddy simulation Instantaneous contours of temperature from large eddy simulation Instantaneous contours of temperature from large eddy simulation of a hypersonic scramjet combustor at Mach 8 flight conditions. Ethylene fuel is introduced through injection ports at the upper left and mixes with air at supersonic speeds. Flow separation and recirculation in the open cavity encourages fuel/air mixing and stable combustion. To maintain hypersonic flight, the fuel must be mixed, ignited, and burned to completion all within a few milliseconds. Cascade Technologies, Inc. Combustion Stability in Complex Engineering Flows PI Name: Lee Shunn PI Email: shunn@cascadetechnologies.com Institution: Cascade Technologies, Inc. Allocation Program: INCITE Allocation Hours at ALCF: 35 Million

383

LOFT Engineering Simulator  

SciTech Connect

The LOFT Engineering Simulator represents an attempt to develop a simulation with sufficient physical detail (solution of the conservation equations) for moderate accident simulation, but which will still run in real time and provide an interface for the operator to interact with the model. The LOFT Engineering Simulator is presently being used to assist the Augmented Operator Capability (AOC) Program. Part of the AOC program has developed techniques to support the Human Engineering Research for evaluating graphics displays in a nuclear reactor control room. The LOFT Engineering Simulator offers: (1) a unique means of supplying plant equivalent simulation data to drive the various graphics dislays under consideration; and (2) a technique to test and evaluate control strategy. This report describes the hardware and software used for the LOFT Engineering Simulator, including the graphics display computer.

Venhuizen, J.R.

1981-09-01T23:59:59.000Z

384

Planar Richtmyer-Meshkov instabilities and transition to turbulence  

SciTech Connect

Extensive recent work has demonstrated that predictive under-resolved simulations of the velocity fields in turbulent flows are possible without resorting to explicit subgrid models. When using a class of physics-capturing high-resolution finite-volume numerical algorithms. This strategy is denoted implicit large eddy simulation (ILES, MILES). The performance of ILES in the substantially more difficult problem of under-resolved material mixing driven by under-resolved velocity fields and initial conditions (ICs) is a focus of the present work. Progress is presented in analyzing the effects of IC combined spectral content and thickness parametrizations. In the large eddy simulation (LES). the large energy containing structures are resolved, the smaller, presumably more isotropic, structures are filtered out, and effects of subgrid scales (SGS) are modeled. ILES effectively addresses the seemingly insurmountable issues posed to LES by under-resolution. by relying on the use of SGS modeling and filtering provided implicitly by a class of physics capturing numerics; extensive verification and validation in areas of engineering. geophysics. and astrophysics has been reported. In many areas of interest such as. inertial confinement fusion. understanding the collapse of the outer cores of supernovas. and supersonic combustion engines, vorticity is introduced at material interfaces by the impulsive loading of shock waves. and turbulence is generated via Richtmyer-Meshkov instabilities (RMI). Given that ILES is based on locally-adaptive, non-oscillatory. finite-volume methods it is naturally suited to emulate shock physics. The unique combination of shock and turbulence emulation capabilities supports direct use of ILES as an effective simulation anzatz for RMI. Here, we further test this approach using a particular strategy based on a nominally-inviscid, Schmidt number {approx} 1, simulation model that uses the LANL RAGE code to investigate planar RMI. Issues of initial material interface characterization and modeling difficulties, and effects of IC resolved spectral content on transitional and late-time turbulent mixing were examined in our previous work. The focus here is to carry out a systematic analysis of effects of combined IC spectral content and thickness.

Grinstein, Fernando F [Los Alamos National Laboratory; Gowardhan, Akshay [Los Alamos National Laboratory; Ristorcelli, Ray [Los Alamos National Laboratory

2011-01-21T23:59:59.000Z

385

An ontology for trajectory simulation  

Science Journals Connector (OSTI)

From the concept exploration for a weapon system to training simulators, from hardware-in-the-loop simulators to mission planning tools, trajectory simulations are used throughout the life cycle of a weapon system. A trajectory simulation can be defined ...

Umut Durak; Halit Oguztuzun; S. Kemal Ider

2006-12-01T23:59:59.000Z

386

tait de 196 et 190 g respectivement au dbut de la priode de mesures. Nous avons observ que les vitesses de croissance des animaux des 2 groupes sont semblables : 617 mg/j/rat pour les  

E-Print Network (OSTI)

vitesses de croissance des animaux des 2 groupes sont semblables : 617 mg/j/rat pour les axéniques et 619 mg/j/rat pour les holoxéniques. Pour des quantités d'aliment ingérées égales, la digestibilité BY THE GERM-FREE RAT Germ-free rats were used to study the effect of the digestive flora on the digestion

Boyer, Edmond

387

Vers un management des amis sur les rseaux socionumriques ? Usage et appropriation sur Facebook, Skyrock et MySpace  

E-Print Network (OSTI)

sites tools, like friends' lists, recommendation agents, search engines and reporting facilities. Elles renvoient, d'une part, à la nature des liens sur les réseaux socionumériques (Rsn), qualifiés d

Boyer, Edmond

388

INFLUENCE DE LA TEMPRATURE SUR LES RSULTATS DE L'ANTIBIOGRAMME PRATIQU PAR LA MTHODE DE DIFFUSION  

E-Print Network (OSTI)

readings of the zones of inhibition were done, after 24 and 48 h of incubation. Minimal inhibitory'administration prati- quement exclusive, la voie orale, et que seuls les élevages de salmoniculture intensive se

Paris-Sud XI, Université de

389

Au-delà de l’économie géographique : les nouvelles politiques d’infrastructure de transport au Gabon.  

E-Print Network (OSTI)

??Cette thèse analyse l’origine des disparités en matière de politiques de transport et d’organisation de l’activité économique au Gabon. Depuis toujours, les infrastructures de transport… (more)

Ada Allogo, Raïssa

2011-01-01T23:59:59.000Z

390

Whole Building Energy Simulation  

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

Whole building energy simulation, also referred to as energy modeling, can and should be incorporated early during project planning to provide energy impact feedback for which design considerations...

391

Vehicle Modeling and Simulation  

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

* PHEV Simulations and Analysis - Travel Profile Database - PHEV Impact on Components - Integration with Renewable Fuels - PHEV Economics - PHEV Test Procedures * Route-Based...

392

NOTE SUR LES EFFETS DE L'INFUSION PERMANENTE D'UN MLANGE D'ACIDES GRAS VOLATILS DANS LE  

E-Print Network (OSTI)

NOTE SUR LES EFFETS DE L'INFUSION PERMANENTE D'UN M�LANGE D'ACIDES GRAS VOLATILS DANS LE RUMEN DU problèmes techniques : infusion permanente et prolongée, dans le rumen, de quantités d'acides gras volatils début de l'infusion, les veaux étaient âgés d'environ 4 mois et pesaient respectivement 95 et 80 kg

Paris-Sud XI, Université de

393

Les Houches 2013: Physics at TeV Colliders: New Physics Working Group Report  

E-Print Network (OSTI)

We present the activities of the "New Physics" working group for the "Physics at TeV Colliders" workshop (Les Houches, France, 3--21 June, 2013). Our report includes new computational tool developments, studies of the implications of the Higgs boson discovery on new physics, important signatures for searches for natural new physics at the LHC, new studies of flavour aspects of new physics, and assessments of the interplay between direct dark matter searches and the LHC.

Brooijmans, G; Fuks, B; Moortgat, F; Richardson, P; Sekmen, S; Weiler, A; Alloul, A; Arbey, A; Baglio, J; Barducci, D; Barr, A J; Basso, L; Battaglia, M; Bélanger, G; Belyaev, A; Bernon, J; Bharucha, A; Bondu, O; Boudjema, F; Boos, E; Buchkremer, M; Bunichev, V; Cacciapaglia, G; Chalons, G; Conte, E; Dolan, M J; Deandrea, A; De Causmaecker, K; Djouadi, A; Dumont, B; Ellis, J; Englert, C; Falkowski, A; Fichet, S; Flacke, T; Gaz, A; Ghezzi, M; Godbole, R; Goudelis, A; Gouzevitch, M; Greco, D; Grober, R; Grojean, C; Guadagnoli, D; Gunion, J F; Herrmann, B; Kalinowski, J; Kim, J H; Kraml, S; Krauss, M E; Kulkarni, S; Lee, S J; Lim, S H; Liu, D; Mahmoudi, F; Maravin, Y; Massironi, A; Mitzka, L; Mohan, K; Moreau, G; Mühlleitner, M M; Nhung, D T; O'Leary, B; Oliveira, A; Panizzi, L; Pappadopulo, D; Pataraia, S; Porod, W; Pukhov, A; Riva, F; Rojo, J; Rosenfeld, R; Ruiz-Álvarez, J; Rzehak, H; Sanz, V; Sengupta, D; Spannowsky, M; Spira, M; Streicher, J; Strobbe, N; Thamm, A; Thomas, M; Torre, R; Waltenberger, W; Walz, K; Wilcock, A; Wulzer, A; Würthwein, F; Wymant, C

2014-01-01T23:59:59.000Z

394

Protolyse in vitro de casine et de gluten par les enzymes pancratiques  

E-Print Network (OSTI)

Protéolyse in vitro de caséine et de gluten par les enzymes pancréatiques Marie-Claire CAMUS, J. C de celle de la pepsine. Dans une étude antérieure in vitro (Camus et al., 1973), nous observions pour et le gluten disparaissaient avec la pepsine (Camus et Sautier, 1972) et diminuaient avec la trypsine

Paris-Sud XI, Université de

395

FERMETURES DE COUCHES DANS LES NOYAUX SPHRIQUES A GRAND EXCS DE NEUTRONS  

E-Print Network (OSTI)

les noyaux stables, et d'autre part des expressions tirées du modèle de Brueckner. Abstract. 2014 for stable nuclei. Other expressions are also calculated on the basis of Brueckner's statistical model. LE stables. Ensuite, d'autres expressions tirées du modèle de Brueckner ont été employées. Dans la section 2

Paris-Sud XI, Université de

396

Les pritextes pistolaires, le cas des Cartas marruecas de Jos Cadalso (1774)  

E-Print Network (OSTI)

les hispanistes. Il appartient au genre que Frédéric Calas qualifie de roman persan, c'est-à-dire un Lettres persanes, mais il est loin d'en être une «pâle imitation» comme l'avait affirmé un certain, Nathan, 1996, Coll. 128, p. 16. 2François Lopez, «De las Lettres persanes a las Cartas marruecas

Paris-Sud XI, Université de

397

UN THEOR`EME SUR LES ACTIONS DE GROUPES DE DIMENSION INFINIE  

E-Print Network (OSTI)

UN TH´EOR`EME SUR LES ACTIONS DE GROUPES DE DIMENSION INFINIE JACQUES F´EJOZ AND MAURICIO GARAY R qui recourent `a un th´eor`eme d'inversion locale (e.g. [3, 5] ou [4, Th´eor`eme 4.2.5]), par l´ee par Kolmogo- rov et Arnold dans leur d´emonstration du th´eor`eme des tores invariants [2, 1]. Le th´eor

Paris-Sud XI, Université de

398

Persistance d'ondes de choc. Persistance d'ondes dans les fluides compressibles.  

E-Print Network (OSTI)

/ 46 #12;Persistance d'ondes de choc. Introduction Thermodynamique Gaz He Ne H2 CO2 Vapeur d'eau b (cm3Persistance d'ondes de choc. Persistance d'ondes dans les fluides compressibles. Magali Mercier Thermodynamique On s'intéresse aux équations d'Euler compressibles pour des solutions régulières : 8

Mercier, Magali

399

Persistance d'ondes de choc. Persistance d'ondes dans les fluides compressibles.  

E-Print Network (OSTI)

choc. Introduction Thermodynamique Gaz He Ne H2 CO2 Vapeur d'eau b (cm3/mol) 23.71 17.10 26.61 42.69 30Persistance d'ondes de choc. Persistance d'ondes dans les fluides compressibles. Magali Mercier d'Euler compressibles pour des solutions régulières : 8 >: t + div(u) = 0 , t u + (u · )u + 1 p

Mercier, Magali

400

Indexation multimedia Caracterisation du desequilibre entre les modalites texte et parole  

E-Print Network (OSTI)

Indexation multim´edia Caract´erisation du d´es´equilibre entre les modalit´es texte et parole M'information multim´edia est un th`eme ´emergeant notamment gr^ace `a des technologies de caract´erisation du contenu multim´edia : la cou- verture en modalit´es (ici texte et parole) est `a consid´erer conjointement `a la

Favre, Benoit

Note: This page contains sample records for the topic "large-eddy simulation les" 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

Navigation par le contenu dans les videos avec des Tables Graphiques des Mati`eres  

E-Print Network (OSTI)

. Nous proposons une visualisation, qui, une fois connect´ee avec un lecteur multim´edia standard, offre connect´e avec un lec- teur standard multim´edia, offre une solution efficace pour survoler le contenu. La de l'art et positionnement Si les lecteurs multim´edia int`egrent tous aujourd'hui une barre de

Paris-Sud XI, Université de

402

Study of cluster behavior in the riser of CFB by the DSMC method  

Science Journals Connector (OSTI)

The flow behaviors of clusters in the riser of a two?dimensional (2D) circulating fluidized bed was numerically studied based on the Euler?Lagrangian approach. Gas turbulence was modeled by means of Large Eddy Simulation (LES). Particle collision was modeled by means of the direct simulation Monte Carlo (DSMC) method. Clusters’ hydrodynamic characteristics are obtained using a cluster identification method proposed by sharrma et al. (2000). The descending clusters near the wall region and the up? and down?flowing clusters in the core were studied separately due to their different flow behaviors. The effects of superficial gas velocity on the cluster behavior were analyzed. Simulated results showed that near wall clusters flow downward and the descent velocity is about ?45? cm / s . The occurrence frequency of the up?flowing cluster is higher than that of down?flowing cluster in the core of riser. With the increase of superficial gas velocity the solid concentration and occurrence frequency of clusters decrease while the cluster axial velocity increase. Simulated results were in agreement with experimental data. The stochastic method used in present paper is feasible for predicting the cluster flow behavior in CFBs.

H. P. Liu; D. Y. Liu; H. Liu

2010-01-01T23:59:59.000Z

403

Centre National de Recherches Mtorologiques Groupe de Meteorologie Experimentale et Instrumentale  

E-Print Network (OSTI)

the 4D evolution and life cycle of a cloud with multiple UAS (unmanned aerial systems). The research humidity, 3D wind vectors, cloud liquid water, etc.). The study will use Meso-NH and specific convective have experience with: - numerical simulations using large eddy simulations. - data analysis

Couvreux, Fleur

404

Atmos. Chem. Phys., 7, 697712, 2007 www.atmos-chem-phys.net/7/697/2007/  

E-Print Network (OSTI)

. This work is licensed under a Creative Commons License. Atmospheric Chemistry and Physics Characterization of the 222 Rn family turbulent transport in the convective atmospheric boundary layer J.-F. Vinuesa and S atmospheric boundary layers (CBL) is inves- tigated. Large eddy simulation is used to simulate their dis

Meskhidze, Nicholas

405

Subgrid-scale model for the temperature fluctuations in reacting hypersonic turbulent flows  

E-Print Network (OSTI)

Subgrid-scale model for the temperature fluctuations in reacting hypersonic turbulent flows M. Pino fluctuations for use in large-eddy simulations of turbulent, reacting hypersonic flows. The proposed model uses, a greater understand- ing of turbulent hypersonic flows is needed. Direct numerical simulations DNS

Martín, Pino

406

Persistent Contrails and Contrail Cirrus. Part II: Full Lifetime Behavior  

Science Journals Connector (OSTI)

More than 200 large-eddy simulations of long-lived contrails from several-seconds age until their demise have been performed and their lifetime-integrated behavior has been analyzed. The simulations employ size-resolved microphysics and include ...

D. C. Lewellen

2014-12-01T23:59:59.000Z

407

Simulation Supported Decision Making  

E-Print Network (OSTI)

.S. Navy Nuclear Program · Decades of dynamic operations of hundreds of nuclear power plants withoutSimulation Supported Decision Making Gene Allen Naval Surface Warfare Center Carderock Division SI: TO PASS ON WHAT I KNOW on SIMULATION · CAREER FOCUS: HOW TO USE COMPUTERS TO DO HELP MAKE BETTER DECISIONS

408

Simulation in the future  

Science Journals Connector (OSTI)

Seven panelists, all simulation consultants, give their view of the future of simulation. There is some consistency in the views with four areas being mentioned by three of the panelists, and four areas being mentioned by two of the panelists. However, ...

Jerry Banks

2000-12-01T23:59:59.000Z

409

Radiation detector spectrum simulator  

DOE Patents (OSTI)

A small battery operated nuclear spectrum simulator having a noise source nerates pulses with a Gaussian distribution of amplitudes. A switched dc bias circuit cooperating therewith generates several nominal amplitudes of such pulses and a spectral distribution of pulses that closely simulates the spectrum produced by a radiation source such as Americium 241.

Wolf, Michael A. (Los Alamos, NM); Crowell, John M. (Los Alamos, NM)

1987-01-01T23:59:59.000Z

410

Radiation detector spectrum simulator  

DOE Patents (OSTI)

A small battery operated nuclear spectrum simulator having a noise source generates pulses with a Gaussian distribution of amplitudes. A switched dc bias circuit cooperating therewith to generate several nominal amplitudes of such pulses and a spectral distribution of pulses that closely simulates the spectrum produced by a radiation source such as Americium 241.

Wolf, M.A.; Crowell, J.M.

1985-04-09T23:59:59.000Z

411

Introduction l'Histoire de l'Ukraine Parmi les peuples slaves, il n'existe pas d'ethnie nationale plus mconnue du public  

E-Print Network (OSTI)

Introduction à l'Histoire de l'Ukraine Parmi les peuples slaves, il n'existe pas d'ethnie nationale'actuelle Ukraine s'étend sur plus de 600 000 km² au nord de la Mer Noire, ce qui fait d'elle le plus grand pays d / Moldaves sont le troisième groupe ethnique, après les Russes. Les Ruthènes sont, en Ukraine, considérés

Boyer, Edmond

412

LA REVUE DE L'EPI N 102 ENJEUX ET DIFFICULTS SOULEVES PAR LES TIC L'DUCATION NATIONALE PREND-ELLE  

E-Print Network (OSTI)

49 LA REVUE DE L'EPI N° 102 ENJEUX ET DIFFICULT�S SOULEV�ES PAR LES TIC L'�DUCATION NATIONALE PREND-ELLE LA JUSTE MESURE DES ENJEUX ET DES DIFFICULT�S SOULEV�ES PAR LES TIC ? Gérard COLLET Mise en demeure d'améliorer son efficacité sans augmenter ses coûts, l'�ducation nationale pense trouver dans les TIC un outil

Paris-Sud XI, Université de

413

Fiabilit de composants semi-conducteur de l'lectronique de -Les modules dlectronique de puissance semi conducteur sont raliss par un assemblage  

E-Print Network (OSTI)

thématique, dans le cadre de linstitut Farman de lENS de Cachan, les laboratoires LMT et SATIE ont initiés

414

Voir Naples et pourrir. L'origine de la contamination chez les alchimistes (XVIe Vronique Adam, Universit Toulouse II Le Mirail  

E-Print Network (OSTI)

traités savants de l'antiquité greco-romaine et du monde arabo-persan, comme sur les textes religieux et

Boyer, Edmond

415

Les représentations sociales des élèves, des enseignants du secondaire et des parents à propos de la réussite scolaire en zones urbaine et rurale au Gabon.  

E-Print Network (OSTI)

??Cette thèse avait pour objectif de dégager et de comparer les représentations sociales de la réussite scolaire des élèves, des enseignants du secondaire et des… (more)

Immongault, Christine Marthe

2014-01-01T23:59:59.000Z

416

E. VILLARI. 2014 Sulla propriet scaricatrice prodotta pei gas dall'uraninite (Sur la proprit de dcharge produite dans les gaz par l'uranite). -  

E-Print Network (OSTI)

les expériences de M. H. Becquerel sur l'uranium, le nitrate d'urane, le sulfate double d'uranyle et

Paris-Sud XI, Université de

417

Computing Stuttering Simulations  

Science Journals Connector (OSTI)

Stuttering bisimulation is a well-known behavioural equivalence ... the next-time operator X. Correspondingly, the stuttering simulation preorder induces a coarser behavioural equivalence ... -time X and globally...

Francesco Ranzato; Francesco Tapparo

2009-01-01T23:59:59.000Z

418

BISEN: Biochemical Simulation Environment  

Science Journals Connector (OSTI)

......how to use MATLAB to generate...265 lines of MATLAB code compute...networks. In Chemical Biophysics...of Cellular Processes. (2008...Supplementary Data 1 - pdf file BISEN: Biochemical Simulation Environment...systems in the MATLAB computing......

J. Vanlier; F. Wu; F. Qi; K. C. Vinnakota; Y. Han; R. K. Dash; F. Yang; D. A. Beard

2009-03-15T23:59:59.000Z

419

Modeling & Simulation publications  

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

Modeling & Simulation » Modeling & Simulation » Modeling & Simulation Publications Modeling & Simulation publications Research into alternative forms of energy, especially energy security, is one of the major national security imperatives of this century. Get Expertise David Harradine Physical Chemistry and Applied Spectroscopy Email Josh Smith Chemistry Email The inherent knowledge of transformation has beguiled sorcerers and scientists alike. D.A. Horner, F. Lambert, J.D. Kress, and L.A. Collins, "Transport properties of lithium hydride from quantum molecular dynamics and orbital-free molecular dynamics," Physical Review B - Condensed Matter and Materials Physics 80(2) (2009). J.D. Kress, D.A. Horner, and L.A. Collins, "Mixing rules for optical and transport properties of warm, dense matter," AIP Conference Proceedings 1195, 931-934 (2009).

420

A restructurable logic simulator  

E-Print Network (OSTI)

elements were strictly binary and time was uniformly quantized. Interconnection information was used to confine simulation effort to active portions of the )ogic network. Delay was modeled with an event scheduling scheme, where logic state transitions... I7. g). Logic )evels become voltages and state transitions become transient responses. The circuit simulators include the effects of numerous parameters in their device models, and then generate their answers by numerically solving systems...

Ledford, Gordon Lee

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "large-eddy simulation les" 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

Some Aspects of Simulator Design  

Science Journals Connector (OSTI)

...Article Some Aspects of Simulator Design J. M. Dempsey Panellit Ltd., Borehamwood, UK Certain aspects of simulator design are considered with particular reference to the Elliott Nuclear Power......

J. M. Dempsey

1960-01-01T23:59:59.000Z

422

Computer simulation | Open Energy Information  

Open Energy Info (EERE)

simulation Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: Computer simulation Author wikipedia Published wikipedia, 2013 DOI Not Provided Check for...

423

From Strings to the LHC. Les Houches Lectures on String Phenomenology  

E-Print Network (OSTI)

These notes are based on lectures given at the Les Houches Summer School in 2011, which was centered on the general topic "Theoretical Physics to face the challenge of LHC". In these lectures I reviewed a number of topics in the field of String Phenomenology, focusing on orientifold/F-theory models yielding semi-realistic low-energy physics. The emphasis was on the extraction of the low-energy effective action and the possible test of specific models at LHC. These notes are a brief summary, appropriately updated, of some of the main topics covered in the lectures.

Luis E. Ibanez

2012-04-24T23:59:59.000Z

424

Advanced Simulation Capability for  

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

Simulation Capability for Simulation Capability for Environmental Management (ASCEM) ASCEM is being developed to provide a tool and approach to facilitate robust and standardized development of perfor- mance and risk assessments for cleanup and closure activi- ties throughout the EM complex. The ASCEM team is composed of scientists from eight National Laboratories. This team is leveraging Department of Energy (DOE) investments in basic science and applied research including high performance computing codes developed through the Advanced Scientific Computing Research and Advanced Simulation & Computing pro- grams as well as collaborating with the Offices of Science, Fossil Energy, and Nuclear Energy. Challenge Current groundwater and soil remediation challenges that will continue to be addressed in the next decade include

425

Simulation of LMFBR  

SciTech Connect

The title of this session is taken to imply the system-wide thermohydraulic simulation of liquid metal fast breeder reactors (LMFBR). One is interested in predicting the temperatures, pressures, and the coolant flow rates throughout the entire plant including the reactor core, the primary and secondary sodium heat transport circuits, the steam generating system as well as other auxiliary circuits. Such a simulation is needed for (1) scoping studies (i.e., in the pre-design phase of a plant), (2) detailed design development, (3) the safety analysis (post-design development phase), and (4) the operator training and plant operation. This session emphasizes the simulation of LMFBRs for only two key categories of transients: operational disturbances or events and the post-shutdown heat removal.

Agrawal, A.K.

1982-01-01T23:59:59.000Z

426

Apport de l’écho-Doppler vasculaire dans les infarctus cérébraux à Brazzaville (Congo)  

Science Journals Connector (OSTI)

RésuméObjectif Déterminer la prévalence des lésions carotidiennes au cours des infarctus cérébraux à Brazzaville (Congo). Patients et méthodes Il s’agit d’une étude transversale descriptive, menée à Brazzaville entre janvier 2011 et juin 2012. Elle a porté sur une série consécutive de 73 patients victimes d’un infarctus cérébral ou d’un accident ischémique transitoire, documenté par un scanner cérébral. Tous les patients ont bénéficié d’un écho-Doppler des troncs supra-aortiques, réalisé dans le cadre du bilan étiologique. L’examen a consisté en la recherche de plaques d’athérome, d’une infiltration pariétale par la mesure de l’épaisseur intima-média (EIM), de sténose ou d’occlusion carotidiennes. Résultats Il s’agissait de 49 hommes (67 %) et 24 femmes (33 %), âgés en moyenne de 58,7 ± 11,8 ans. L’accident vasculaire était transitoire chez 11 patients (15 %) et constitué chez 62 (85 %). Les principaux facteurs de risque vasculaires identifiés étaient une hypertension artérielle connue et traitée dans 66 cas (90,4 %), une dyslipidémie dans 16 cas (22 %), un diabète sucré dans 9 cas (12,3 %), et un tabagisme dans 5 cas (6,8 %), avec un taux de cumul de 2,5 facteurs par individu. L’écho-Doppler des troncs supra-aortiques, normal chez 44 patients (60,3 %) était pathologique chez les 29 autres (39,7 %). Les principales anomalies mises en évidence étaient une plaque dans 10 cas (13,7 %), une infiltration pariétale dans 19 cas (26 %) avec une EIM moyenne de 0,86 ± 0,11 mm à gauche et 0,83 ± 0,11 mm à droite. Deux cas de sténose modérée étaient notés respectivement sur les carotides internes droite et gauche. Conclusion Cette étude préliminaire confirme l’existence d’anomalies athéromateuses carotidiennes au cours des accidents vasculaires cérébraux ischémiques. Ces lésions, quoique non significatives, doivent être recherchées en vue d’améliorer la prise en charge des patients à haut risque vasculaire. SummaryObjective To determine the prevalence of the carotid lesions during ischemic strokes. Methods This was a descriptive cross-sectional study, conducted in Brazzaville from January 2011 to June 2012 in a consecutive series of 73 patients, victims of a transient ischemic attack or ischemic stroke, documented by a brain computed tomography. All patients underwent vascular ultrasonography of the supra-aortic trunks, carried out within the framework of etiological assessment. The examination searched for plaques, parietal infiltration (measurement of intima-media thickness), and carotid stenosis or occlusion. Results There were 49 men (67%) and 24 women (33%), mean age 58.7 ± 11.8 years. Eleven patients (15%) had a transient ischemic attack and 62 (85%) an ischemic stroke. The identified independent vascular risk factors were known and treated hypertension (n = 66, 90.4%), dyslipidemia (n = 16, 22%), diabetes mellitus (n = 9, 12.3%), and smoking (n = 5, 6.8%), with on average 2.5 factors per individual. Vascular ultrasonography of the supra-aortic trunks, normal in 44 patients (60.3%) was pathological in the other 29 (39.7%). The main anomalies were atheromatous plaque (n = 10, 13.7%), parietal infiltration (n = 19, 26%). On average intima-media thickness was 0.86 ± 0.11 mm on the left and 0.83 ± 0.11 mm on the right. Two cases of moderate stenosis were noted on the right and left internal carotids, respectively. Conclusion This preliminary study confirms the existence of carotid atherosclerosis anomalies during ischemic strokes. These lesions, though non-significant, must nevertheless be taken into consideration when searching for the cause of stroke in high-risk vascular patients.

S.M. Ikama; B.M. Nsitou; P.M. Ossou-Nguiet; G.F. Otiobanda; E. Matali

2014-01-01T23:59:59.000Z

427

Computing Stuttering Simulations  

E-Print Network (OSTI)

Stuttering bisimulation is a well-known behavioral equivalence that preserves CTL-X, namely CTL without the next-time operator X. Correspondingly, the stuttering simulation preorder induces a coarser behavioral equivalence that preserves the existential fragment ECTL-{X,G}, namely ECTL without the next-time X and globally G operators. While stuttering bisimulation equivalence can be computed by the well-known Groote and Vaandrager's [1990] algorithm, to the best of our knowledge, no algorithm for computing the stuttering simulation preorder and equivalence is available. This paper presents such an algorithm for finite state systems.

Ranzato, Francesco

2009-01-01T23:59:59.000Z

428

Advanced Simulation and Computing  

National Nuclear Security Administration (NNSA)

NA-ASC-117R-09-Vol.1-Rev.0 NA-ASC-117R-09-Vol.1-Rev.0 Advanced Simulation and Computing PROGRAM PLAN FY09 October 2008 ASC Focal Point Robert Meisner, Director DOE/NNSA NA-121.2 202-586-0908 Program Plan Focal Point for NA-121.2 Njema Frazier DOE/NNSA NA-121.2 202-586-5789 A Publication of the Office of Advanced Simulation & Computing, NNSA Defense Programs i Contents Executive Summary ----------------------------------------------------------------------------------------------- 1 I. Introduction -------------------------------------------------------------------------------------------------------- 2 Realizing the Vision ------------------------------------------------------------------------------------------------- 2 The Future of the Nuclear Weapons Complex ---------------------------------------------------------------- 2

429

Rodrigues, C., Quanquin, V. & Foucher, A.-L. (2014). Flexibilit technologique et apprentissage socioconstructiviste : un exemple de dispositif de formation hybride. Colloque international Les TIC en  

E-Print Network (OSTI)

socioconstructiviste : un exemple de dispositif de formation hybride. » Colloque international Les TIC en éducation socioconstructiviste et des possibilités des TIC, en raison de leur flexibilité technologique, via un "usage enseignantes, notamment pour l'utilisation des TIC. Les données écologiques recueillies dans ce cadre

Paris-Sud XI, Université de

430

TP HTML -CSS -PHP -POSTGRESQL Le but de ce TP est de complter les fichiers fournis pour raliser une micro application interactive qui  

E-Print Network (OSTI)

TP HTML - CSS - PHP - POSTGRESQL Le but de ce TP est de compléter les fichiers fournis pour afficher (fichiers .html ou .php). · Enregistrez dans votre home l'archive contenant les fichiers du TP à partir de http://perso.limsi.fr/annlor/enseignement/ensiie/pw/tpPHP.tar · Extrayez de l'archive le

Ligozat, Anne-Laure

431

Nuclear Engineering and Design 263 (2013) 3241 Contents lists available at SciVerse ScienceDirect  

E-Print Network (OSTI)

issue for nuclear power plants. In this work, temperature and velocity fluctuations in hot and cold al., 2009). Several thermal striping accidents have occurred in nuclear plants involving bothDirect Nuclear Engineering and Design journal homepage: www.elsevier.com/locate/nucengdes Large-eddy simulations

Attinger, Daniel

432

AN ABSTRACT OF THE THESIS OF Andrew John Cihonski for the degree of Master of Science in  

E-Print Network (OSTI)

processes such as oxy-coal combustion power plants. Presented in this work are a series of studies related present in these processes. This work on large-eddy simulation of particle-laden flows seeks to help working together since my arrival at Oregon State University. Also, I would like to thank the thermal

Apte, Sourabh V.

433

Parameterization of Pressure Perturbations in a PBL Mass-Flux Model CARA-LYN LAPPEN AND DAVID A. RANDALL  

E-Print Network (OSTI)

. RANDALL Department of Atmospheric Sciences, Colorado State University, Fort Collins, Colorado (Manuscript large-eddy simulations. 1. Introduction In 2001, we (Lappen and Randall 2001a­c, hereafter LR01a and Randall 2005, hereafter LR05), we describe ADHOC2, which includes consis- tent representations

Randall, David A.

434

Open Archive TOULOUSE Archive Ouverte (OATAO) OATAO is an open access repository that collects the work of Toulouse researchers and  

E-Print Network (OSTI)

b IMFT-UMR 5502, allée du Professeur Camille Soula, 31400 Toulouse, France Keywords: Gas turbines Turbulent non-perfectly premixed combustion Large eddy simulation Reduced chemistry Thermo-acoustic of mean and RMS fields of temperature, species, velocities as well as mixture fraction pdfs and unsteady

Paris-Sud XI, Université de

435

Open Archive TOULOUSE Archive Ouverte (OATAO) OATAO is an open access repository that collects the work of Toulouse researchers and  

E-Print Network (OSTI)

Soula, 31400 Toulouse, France Keywords: Gas turbines Turbulent non-perfectly premixed combustion Large eddy simulation Reduced chemistry Thermo-acoustic instabilities a b s t r a c t This paper investigates of temperature, species, velocities as well as mixture fraction pdfs and unsteady activity for two regimes

Mailhes, Corinne

436

CTR SUMMER PROGRAM 2012 Group Participants Project Title Host  

E-Print Network (OSTI)

Venugopal Large eddy simulation of self-noise from a wind turbine airfoil at high angle of attack Bodart Moreau Uncertainty quantification of turbo-engine fan noise Iaccarino Jean-Christophe Giret Stéphane Moreau Uncertainty quantification of the far-field noise from a Rod-Airfoil configuration using

Prinz, Friedrich B.

437

CTR Summer Program 2012 Presentation of Research Plans  

E-Print Network (OSTI)

Large eddy simulation of self-noise from a wind turbine airfoil at high angle of attack 10:35am Further, Moreau Stéphane Uncertainty quantification of turbo-engine fan noise Giret Jean-Christophe, Moreau Stéphane Uncertainty quantification of the far-field noise from a Rod-Airfoil configuration using

Prinz, Friedrich B.

438

Edition No 28 March 2007 Congratulations to  

E-Print Network (OSTI)

Income 1-Apr-07 31-Mar-10 Kronenburg Large eddy simulations of diesel engine combustion EPSRC £352,073 1 of Mechanical Engineering at Imperial College London under the supervision of Professor Peter Lindstedt. Before Leevers Quantifying and Improving NDE EPSRC £256,070 1-Apr-07 31-Mar-10 Dini General approach

439

This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 8575  

E-Print Network (OSTI)

engine Spark ignition Cycle-to-cycle variation Large-Eddy Simulation Chemiluminescence OH Planar Laser of stable and unstable operating points in a spark ignition engine. (2012) Combustion and Flame, vol. 159 (n study of cycle-to-cycle variations of stable and unstable operating points in a spark ignition engine V

Mailhes, Corinne

440

The Influence of Wind Speed on Shallow Marine Cumulus Convection  

Science Journals Connector (OSTI)

The role of wind speed on shallow marine cumulus convection is explored using large-eddy simulations and concepts from bulk theory. Focusing on cases characteristic of the trades, the equilibrium trade wind layer is found to be deeper at stronger ...

Louise Nuijens; Bjorn Stevens

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "large-eddy simulation les" 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

INCITE Projects 2012 INCITE Projects  

E-Print Network (OSTI)

: 4 Million Hours Large-Eddy Simulation of Two-Phase Flow Combustion in Gas Turbines Thierry Poinsot-to-Cirrus Transition Roberto Paoli, CERFACS Allocation: 20 Million Hours Climate-Science Computational Development Team Hours Energy Technologies Optimization of Complex Energy System Under Uncertainty Mihai Anitescu

Kemner, Ken

442

Visualizing Gyrokinetic Simulations  

Science Journals Connector (OSTI)

The continuing advancement of plasma science is central to realizing fusion as an inexpensive and safe energy source. Gryokinetic simulations of plasmas are fundamental to the understanding of turbulent transport in fusion plasma. This paper discusses ... Keywords: graphics hardware, non-rectilinear mesh, plasma physics, scientific visualization, texture methods, volume visualization

David Crawford; Kwan-Liu Ma; Min-Yu Huang; Scott Klasky; Stephane Ethier

2004-10-01T23:59:59.000Z

443

Introduction. Biomolecular simulation  

Science Journals Connector (OSTI)

...Chemical bonding is a quantum mechanical phenomenon...account the essential quantum mechanics (QM) are...enzyme reaction involves quantum tunnelling, an area...simulation promises in future to provide exciting new...machines such as biological motors and pumps. This themed...

2008-01-01T23:59:59.000Z

444

Enabling immersive simulation.  

SciTech Connect

The object of the 'Enabling Immersive Simulation for Complex Systems Analysis and Training' LDRD has been to research, design, and engineer a capability to develop simulations which (1) provide a rich, immersive interface for participation by real humans (exploiting existing high-performance game-engine technology wherever possible), and (2) can leverage Sandia's substantial investment in high-fidelity physical and cognitive models implemented in the Umbra simulation framework. We report here on these efforts. First, we describe the integration of Sandia's Umbra modular simulation framework with the open-source Delta3D game engine. Next, we report on Umbra's integration with Sandia's Cognitive Foundry, specifically to provide for learning behaviors for 'virtual teammates' directly from observed human behavior. Finally, we describe the integration of Delta3D with the ABL behavior engine, and report on research into establishing the theoretical framework that will be required to make use of tools like ABL to scale up to increasingly rich and realistic virtual characters.

McCoy, Josh (University of California Santa Cruz, Santa Cruz, CA); Mateas, Michael (University of California Santa Cruz, Santa Cruz, CA); Hart, Derek H.; Whetzel, Jonathan; Basilico, Justin Derrick; Glickman, Matthew R.; Abbott, Robert G.

2009-02-01T23:59:59.000Z

445

ClimateSimulation Biogeochemistry  

E-Print Network (OSTI)

to sequester further CO2 emissions. Chlorophyll concentration from an eddy-resolving POP simulation with full ability of the ocean to sequester further CO2 emissions. Chlorophyll concentration from an eddy release and the future ability of the ocean to sequester further CO2 emissions. Chlorophyll concentration

446

FASTBUS simulation tools  

SciTech Connect

A generalized model of a FASTBUS master is presented. The model is used with simulation tools to aid in the specification, design, and production of FASTBUS slave modules. The model provides a mechanism to interact with the electrical schematics and software models to predict performance. The model is written in the IEEE std 1076-1987 hardware description language VHDL. A model of the ATC logic is also presented. VHDL was chosen to provide portability to various platforms and simulation tools. The models, in conjunction with most commercially available simulators, will perform all of the transactions specified in IEEE std 960-1989. The models may be used to study the behavior of electrical schematics and other software models and detect violations of the FASTBUS protocol. For example, a hardware design of a slave module could be studied, protocol violations detected and corrected before committing money to prototype development. The master model accepts a stream of high level commands from an ASCII file to initiate FASTBUS transactions. The high level command language is based on the FASTBUS standard routines listed in IEEE std 1177-1989. Using this standard-based command language to direct the model of the master, hardware engineers can simulate FASTBUS transactions in the language used by physicists and programmers to operate FASTBUS systems. 15 refs., 6 figs.

Dean, T.D. (Stanford Linear Accelerator Center, Menlo Park, CA (United States)); Haney, M.J. (Illinois Univ., Urbana, IL (United States))

1991-10-01T23:59:59.000Z

447

Modeling aerosol growth by aqueous chemistry in nonprecipitating stratiform cloud  

SciTech Connect

A new microphysics module based on a two-dimensional (2D) joint size distribution function representing both interstitial and cloud particles is developed and applied to studying aerosol processing in non-precipitating stratocumulus clouds. The module is implemented in a three-dimensional dynamical framework of a large-eddy simulation (LES) model and in a trajectory ensemble model (TEM). Both models are used to study the modification of sulfate aerosol by the activation - aqueous chemistry - resuspension cycle in shallow marine stratocumulus clouds. The effect of particle mixing and different size-distribution representations on modeled aerosol processing are studied in a comparison of the LES and TEM simulations with the identical microphysics treatment exposes and a comparison of TEM simulations with a 2D fixed and moving bin microphysics. Particle mixing which is represented in LES and neglected in the TEM leads to the mean relative per particle dry mass change in the TEM simulations being about 30% lower than in analogous subsample of LES domain. Particles in the final LES spectrum are mixed in from different “parcels”, some of which have experienced longer in-cloud residence times than the TEM parcels, all of which originated in the subcloud layer, have. The mean relative per particle dry mass change differs by 14% between TEM simulations with fixed and moving bin microphysics. Finally, the TEM model with the moving bin microphysics is used to evaluate assumptions about liquid water mass partitioning among activated cloud condensation nuclei (CCN) of different dry sizes. These assumptions are used in large-scale models to map the bulk aqueous chemistry sulfate production, which is largely proportional to the liquid water mass, to the changes in aerosol size distribution. It is shown that the commonly used assumptions that the droplet mass is independent of CCN size or that the droplet mass is proportional to the CCN size to the third power do not perform well in the considered case. The explicitly predicted water partitioning indicates that the mean mass of droplets participating in the models aqueous chemistry calculations is proportional to the dry CCN size.

Ovchinnikov, Mikhail; Easter, Richard C.

2010-07-29T23:59:59.000Z

448

Wake Turbulence of Two NREL 5-MW Wind Turbines Immersed in a Neutral Atmospheric Boundary-Layer Flow  

E-Print Network (OSTI)

The fluid dynamics video considers an array of two NREL 5-MW turbines separated by seven rotor diameters in a neutral atmospheric boundary layer (ABL). The neutral atmospheric boundary-layer flow data were obtained from a precursor ABL simulation using a Large-Eddy Simulation (LES) framework within OpenFOAM. The mean wind speed at hub height is 8m/s, and the surface roughness is 0.2m. The actuator line method (ALM) is used to model the wind turbine blades by means of body forces added to the momentum equation. The fluid dynamics video shows the root and tip vortices emanating from the blades from various viewpoints. The vortices become unstable and break down into large-scale turbulent structures. As the wakes of the wind turbines advect further downstream, smaller-scale turbulence is generated. It is apparent that vortices generated by the blades of the downstream wind turbine break down faster due to increased turbulence levels generated by the wake of the upstream wind turbine.

Bashioum, Jessica L; Schmitz, Sven; Duque, Earl P N

2013-01-01T23:59:59.000Z

449

OH-PLIF Measurements of High-Pressure, Hydrogen Augmented Premixed Flames in the SimVal Combustor  

SciTech Connect

Planar Laser Induced Fluorescence (PLIF) measurements of the hydroxyl radical in lean, premixed natural gas flames augmented with hydrogen are presented. The experiments were conducted in the SimVal combustor at the National Energy Technology Laboratory (NETL) at operating pressures from 1 to 8 atmospheres. The data, which was collected in a combustor with well controlled boundary conditions, is intended to be used for validating Computational Fluid Dynamics (CFD) models under conditions directly relevant to land-based gas turbine engines. The images, which show significant effects of hydrogen on local flame quenching are discussed in terms of a turbulent premixed combustion regime and non-dimensional parameters such as Karlovitz number. Pressure was found to thin the OH region, but only had a secondary effect on overall flame shape compared to the effects of hydrogen addition which was found to decrease local quenching and shorten the turbulent flame brush. A method to process the individual images based on local gradients of fluorescence intensity is proposed and results are presented. Finally, the results of several Large Eddy Simulations (LES) are presented and compared to the experimental data in an effort to understand the issues related to model validation, especially for simulations that do not include OH as an intermediate species.

Strakey, P.A.; Woodruff, S.D.; Williams, T.C. (Sandia); Schefer, R.W. (Sandia)

2007-01-01T23:59:59.000Z

450

L'agriculture familiale se dfinit par le recours quasi-exclusif du travail familial, sans sa-laris permanents,et par des interrelations fortes entre les agriculteurs et leur exploitation.Le  

E-Print Network (OSTI)

1 #12;L'agriculture familiale se définit par le recours quasi-exclusif à du travail familial, sans agricultures familiales. Avec ses 500 millions d'exploitations, elles font vivre 2,6 milliards de personnes et, les agricultures familiales sont présentes sur tous les continents et dans tous les écosystèmes. Cette

451

La fraude scientifique au CNRS Le CNRS, comme tous les tablissements de recherche, est confront la question de la  

E-Print Network (OSTI)

La fraude scientifique au CNRS Le CNRS, comme tous les établissements de recherche, est confronté à la question de la fraude scientifique. Qu'est-ce que la fraude ? trucage, manipulation des données cas individuels)? Il faut distinguer deux situations : - Le cas de fraude peut être découvert par l

van Tiggelen, Bart

452

Traitements de la langue naturelle pour la RI Dans cette section, on discute les deux problmes suivants  

E-Print Network (OSTI)

common in Britain. Soit la phrase suivante dans un texte: There was ash from the coal fire. On veux suivantes: Ash(1): The soft grey powder that remains after something has been burnt. Ash(2): A forest tree savoir si "ash" s'agit de ash(1) ou ash(2). Pour cela, on retrouve les définition des mots dans le

Nie, Jian-Yun

453

Flots d'Anosov sur les vari'et'es graph'ees au sens de Waldhausen  

E-Print Network (OSTI)

suspensions de diff'eomorphismes lin'eaires hyperboliques du tore et les flots g'eod'esiques des surfaces riemanniennes `a courbure n'egative constante. Nous appelons le deuxi`eme type d'exemples bifeuilletages g'eod`es, topologiquement 'equivalent au flot g'eod'esique d'une surface riemannienne `a courbure constante n'egative. Le

Zeghib, Abdelghani

454

Etude thorique par R.M.N. du couplage entre structure et dynamique molculaires locales dans les solutions liquides  

E-Print Network (OSTI)

les solutions liquides P. H. Fries (*) (**) et B. Melloni Rigobello (***) Pontificia Universidad diffusion (équation de Smoluchowski) qui dépend de la structure locale du liquide. Pour tester dans des cas structure of the liquid. In order to test experimentally the validity of this équation, we propose

Boyer, Edmond

455

Effets de drivs d'acides gras sur les ingestions volontaires d'aliments chez le mouton  

E-Print Network (OSTI)

Notre-Dame de la Paix, B-5000 Namur, Belgique. Summary. The continuous infusion of different fatty acid the same decreasing effect on the voluntary dry matter intake of adult sheep than the infusion of oleic jours au cours desquelles les sous-groupes reçoivent, en alternance, des infusions continues (1 1/animal

Boyer, Edmond

456

6th International Symposium on High-Temperature Corrosion and Protection of Materials, Les Embiez, 16 au 21 mai 2004  

E-Print Network (OSTI)

6th International Symposium on High-Temperature Corrosion and Protection of Materials, Les Embiez ; transition ; oxide layer damage Abstract. The kinetic curves of oxidation of Zircaloy-4 exhibit a transition they have no influence during the pre-transition) and the oxide layer is damaged, with large cracks parallel

Boyer, Edmond

457

L'art de l'analyse du risque-pays : Etude empirique dans les pays mergents  

E-Print Network (OSTI)

dans les pays en développement. Classification JEL : C13, D81, F17, F18, F23, F37. Mots-clefs : Risque Classification : C13, D81, F17, F18, F23, F37. Keywords : Country Risk; economic risk; financial risk; political

Boyer, Edmond

458

Simulation standards: a framework for standard modular simulation  

Science Journals Connector (OSTI)

The primary reason for building manufacturing simulations is to provide support tools that aid the manufacturing decision-making process. Simulations are typically a part of a case study commissioned by manufacturing management to address a particular ...

Charles McLean; Swee Leong

2002-12-01T23:59:59.000Z

459

Simulation for ARPI and the Air Campaign Simulator Scott Anderson  

E-Print Network (OSTI)

' #12;Simulation for ARPI and the Air Campaign Simulator Paul Cohen Scott Anderson David Westbrook will be satis ed, and so forth. Nevertheless, such evaluation is critical to a sci- enti c understanding of how

Southern California, University of

460

Risk Analysis and Simulation  

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

Analysis and Simulation Analysis and Simulation for Geologic Storage of CO 2 BEST PRACTICES for: 2013 Revised Edition 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 therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The

Note: This page contains sample records for the topic "large-eddy simulation les" 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

PEBBLES Mechanics Simulation Speedup  

SciTech Connect

Pebble bed reactors contain large numbers of spherical fuel elements arranged randomly. Determining the motion and location of these fuel elements is required for calculating certain parameters of pebble bed reactor operation. These simulations involve hundreds of thousands of pebbles and involve determining the entire core motion as pebbles are recirculated. Single processor algorithms for this are insufficient since they would take decades to centuries of wall-clock time. This paper describes the process of parallelizing and speeding up the PEBBLES pebble mechanics simulation code. Both shared memory programming with the Open Multi-Processing API and distributed memory programming with the Message Passing Interface API are used in simultaneously in this process. A new shared memory lock-less linear time collision detection algorithm is described. This method allows faster detection of pebbles in contact than generic methods. These combine to make full recirculations on AVR sized reactors possible in months of wall clock time.

Joshua J. Cogliati; Abderrafi M. Ougouag

2010-05-01T23:59:59.000Z

462

The Simulation Intranet Architecture  

SciTech Connect

The Simdarion Infranet (S1) is a term which is being used to dcscribc one element of a multidisciplinary distributed and distance computing initiative known as DisCom2 at Sandia National Laboratory (http ct al. 1998). The Simulation Intranet is an architecture for satisfying Sandia's long term goal of providing an end- to-end set of scrviccs for high fidelity full physics simu- lations in a high performance, distributed, and distance computing environment. The Intranet Architecture group was formed to apply current distributed object technologies to this problcm. For the hardware architec- tures and software models involved with the current simulation process, a CORBA-based architecture is best suited to meet Sandia's needs. This paper presents the initial desi-a and implementation of this Intranct based on a three-tier Network Computing Architecture(NCA). The major parts of the architecture include: the Web Cli- ent, the Business Objects, and Data Persistence.

Holmes, V.P.; Linebarger, J.M.; Miller, D.J.; Vandewart, R.L.

1998-12-02T23:59:59.000Z

463

SATCOM constellation power simulation  

SciTech Connect

Three basic variables directly impact the power and energy generated by the SATCOM satellite constellation and its individual Space Vehicles (SVs). They are (1) telecommunications traffic patterns, (2) network resource management controllables, and (3) system hardware and software performance. This power simulation has verified the robustness of the telecommunications architecture. It has validated the onboard resource allocation process from an SV and network level power and energy perspective. The analyses have led to development of operational procedures that prevent SV node outages, and maximize network telecommunication traffic capacity. The program objective is to optimize overall system operation, availability and quality of service. Achieving this goal requires a thorough understanding of the Electrical Power Subsystem and its interfaces. The EPS simulation model analyzes network level performance by evaluating requirement compliance in the expected operating environments. Specifically, the simulation tool evaluates different design approaches and network operational strategies from a power and energy perspective. As a result, optimal load management solutions will be implemented both on-board the SV and via ground station directed resource allocation strategies.

Capulli, J.; Badke, B.; Davis, G. [Motorola, Chandler, AZ (United States)

1995-12-31T23:59:59.000Z

464

COLLABORATIVE: FUSION SIMULATION PROGRAM  

SciTech Connect

New York University, Courant Institute of Mathematical Sciences, participated in the ���¢��������Fusion Simulation Program (FSP) Planning Activities���¢������� [http://www.pppl.gov/fsp], with C.S. Chang as the institutional PI. FSP���¢��������s mission was to enable scientific discovery of important new plasma phenomena with associated understanding that emerges only upon integration. This requires developing a predictive integrated simulation capability for magnetically-confined fusion plasmas that are properly validated against experiments in regimes relevant for producing practical fusion energy. Specific institutional goal of the New York University was to participate in the planning of the edge integrated simulation, with emphasis on the usage of large scale HPCs, in connection with the SciDAC CPES project which the PI was leading. New York University successfully completed its mission by participating in the various planning activities, including the edge physics integration, the edge science drivers, and the mathematical verification. The activity resulted in the combined report that can be found in http://www.pppl.gov/fsp/Overview.html. Participation and presentations as part of this project are listed in a separation file.

Chang, Choong Seock

2012-06-05T23:59:59.000Z

465

Simulation of the strong interaction  

Science Journals Connector (OSTI)

...Issue New science from high-performance computing organized by Richard Catlow...lattice qcd|simulation|high-performance computing|quark masses|b physics...lattice QCD; simulation; high-performance computing; quark masses; B physics...

2002-01-01T23:59:59.000Z

466

Simulation Modeling of Estuarine Ecosystems  

Science Journals Connector (OSTI)

A simulation model has been developed of Galveston Bay, Texas ecosystem. Secondary productivity measured by harvestable species...

Robert W. Johnson

1980-01-01T23:59:59.000Z

467

December 2003 SIMULATION NEWS EUROPE  

E-Print Network (OSTI)

Simulating High Energy Ball Mills using Discrete Events ­ page 3 Transport Logistics Study Discrete Event, CP, C10, C11, C15 11 Comparison Solutions Comparisons of Modelling and Simulation Techniques Europe, comparisons on simulation techniques Editor-in-Chief: Felix Breitenecker, TU Vienna - ARGESIM, c

Kuzmanov, Georgi

468

Plasma theory and simulation research  

SciTech Connect

Our research group uses both theory and simulation as tools in order to increase the understanding of instabilities, heating, diffusion, transport and other phenomena in plasmas. We also work on the improvement of simulation, both theoretically and practically. Our focus has been more and more on the plasma edge (the sheath''), interactions with boundaries, leading to simulations of whole devices (someday a numerical tokamak).

Birdsall, C.K.

1989-01-01T23:59:59.000Z

469

Bio-threat microparticle simulants  

SciTech Connect

A bio-threat simulant that includes a carrier and DNA encapsulated in the carrier. Also a method of making a simulant including the steps of providing a carrier and encapsulating DNA in the carrier to produce the bio-threat simulant.

Farquar, George Roy; Leif, Roald

2014-09-16T23:59:59.000Z

470

Computer Simulations of Protein Folding  

E-Print Network (OSTI)

CHAPTER 8 Computer Simulations of Protein Folding VIJAY S. PANDE , ERIC J. SORIN , CHRISTOPHER D, CA 94305, USA 8.1 Introduction: Goals and Challenges of Simulating Protein Folding Computer as well as recent applications of this methodology. 8.1.1 Simulating Protein Folding Proteins play

Sorin, Eric J.

471

Representing Cloud Processing of Aerosol in Numerical Models  

SciTech Connect

The satellite imagery in Figure 1 provides dramatic examples of how aerosol influences the cloud field. Aerosol from ship exhaust can serve as nucleation centers in otherwise cloud-free regions, forming ship tracks (top image), or can enhance the reflectance/albedo in already cloudy regions. This image is a demonstration of the first indirect effect, in which changes in aerosol modulate cloud droplet radius and concentration, which influences albedo. It is thought that, through the effects it has on precipitation (drizzle), aerosol can also affect the structure and persistence of planetary boundary layer (PBL) clouds. Regions of cellular convection, or open pockets of cloudiness (bottom image) are thought to be remnants of strongly drizzling PBL clouds. Pockets of Open Cloudiness (POCs) (Stevens et al. 2005) or Albrecht's ''rifts'' are low cloud fraction regions characterized by anomalously low aerosol concentrations, implying they result from precipitation. These features may in fact be a demonstration of the second indirect effect. To accurately represent these clouds in numerical models, we have to treat the coupled cloud-aerosol system. We present the following series of mesoscale and large eddy simulation (LES) experiments to evaluate the important aspects of treating the coupled cloud-aerosol problem. 1. Drizzling and nondrizzling simulations demonstrate the effect of drizzle on a mesoscale forecast off the California coast. 2. LES experiments with explicit (bin) microphysics gauge the relative importance of the shape of the aerosol spectrum on the 3D dynamics and cloud structure. 3. Idealized mesoscale model simulations evaluate the relative roles of various processes, sources, and sinks.

Mechem, D.B.; Kogan, Y.L.

2005-03-18T23:59:59.000Z

472

Analyse de la bande 03BD2 + 03BD4 de 12CF4. Concidences pour J' ~ 40 avec les raies de CO2  

E-Print Network (OSTI)

1155 Analyse de la bande 03BD2 + 03BD4 de 12CF4. Coïncidences pour J' ~ 40 avec les raies de CO2 G) Résumé. - La bande 03BD2 + 03BD4 de 12CF4 a été analysée à partir d'un spectre interférométrique (d coïncidences entre les transitions de 12CF4(J' ~ 40) et les raies des lasers 16O12C16O, 18O12C18O, 16O12C18O

Paris-Sud XI, Université de

473

Simulating Cosmic Reionization  

E-Print Network (OSTI)

The Cosmic Dark Ages and the Epoch of Reionization constitute a crucial missing link in our understanding of the evolution of the intergalactic medium and the formation and evolution of galaxies. Due to the complex nature of this global process it is best studied through large-scale numerical simulations. This presents considerable computational challenges. The dominant contributors of ionizing radiation were dwarf galaxies. These tiny galaxies must be resolved in very large cosmological volumes in order to derive their clustering properties and the corresponding observational signatures correctly, which makes this one of the most challenging problems of numerical cosmology. We have recently performed the largest and most detailed simulations of the formation of early cosmological large-scale structures and their radiative feedback leading to cosmic reionization. This was achieved by running extremely large (up to 29 billion-particle) N-body simulations of the formation of the Cosmic Web, with enough particles and sufficient force resolution to resolve all the galactic halos with total masses larger than 10^8 Solar masses in computational volumes of up to (163 Mpc)^3. These results were then post-processed by propagating the ionizing radiation from all sources by using fast and accurate ray-tracing radiative transfer method. Both of our codes are parallelized using a combination of MPI and OpenMP and to this date have been run efficiently on up to 2048 cores (N-body) and up to 10000 cores (radiative transfer) on the newly-deployed Sun Constellation Linux Cluster at the Texas Advanced Computing Center. In this paper we describe our codes, parallelization strategies, scaling and some preliminary scientific results. (abridged)

Ilian T. Iliev; Paul R. Shapiro; Garrelt Mellema; Hugh Merz; Ue-Li Pen

2008-06-17T23:59:59.000Z

474

Plasma Simulation Program  

SciTech Connect

Many others in the fusion energy and advanced scientific computing communities participated in the development of this plan. The core planning team is grateful for their important contributions. This summary is meant as a quick overview the Fusion Simulation Program's (FSP's) purpose and intentions. There are several additional documents referenced within this one and all are supplemental or flow down from this Program Plan. The overall science goal of the DOE Office of Fusion Energy Sciences (FES) Fusion Simulation Program (FSP) is to develop predictive simulation capability for magnetically confined fusion plasmas at an unprecedented level of integration and fidelity. This will directly support and enable effective U.S. participation in International Thermonuclear Experimental Reactor (ITER) research and the overall mission of delivering practical fusion energy. The FSP will address a rich set of scientific issues together with experimental programs, producing validated integrated physics results. This is very well aligned with the mission of the ITER Organization to coordinate with its members the integrated modeling and control of fusion plasmas, including benchmarking and validation activities. [1]. Initial FSP research will focus on two critical Integrated Science Application (ISA) areas: ISA1, the plasma edge; and ISA2, whole device modeling (WDM) including disruption avoidance. The first of these problems involves the narrow plasma boundary layer and its complex interactions with the plasma core and the surrounding material wall. The second requires development of a computationally tractable, but comprehensive model that describes all equilibrium and dynamic processes at a sufficient level of detail to provide useful prediction of the temporal evolution of fusion plasma experiments. The initial driver for the whole device model will be prediction and avoidance of discharge-terminating disruptions, especially at high performance, which are a critical impediment to successful operation of machines like ITER. If disruptions prove unable to be avoided, their associated dynamics and effects will be addressed in the next phase of the FSP.

Greenwald, Martin

2011-10-04T23:59:59.000Z

475

Unipolar arc simulation device  

SciTech Connect

We describe a simple laboratory device for establishing a vacuum arc plasma discharge that can serve to simulate a unipolar arc. The technique makes use of a triggered vacuum arc plasma gun to generate a plasma plume that in turn causes breakdown of a secondary discharge. The device is in fact a secondary vacuum arc discharge that is triggered by a primary vacuum arc discharge, with some of the features of the secondary plasma discharge having similarities with a unipolar arc configuration. Here we describe the experimental setup and outline how the device can be used for some areas of unipolar arc materials research. [copyright] [ital 1999 American Institute of Physics.

Wang, S.G.; Brown, I.G. (Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 (United States))

1999-09-01T23:59:59.000Z

476

SEALING SIMULATED LEAKS  

SciTech Connect

This report details the testing equipment, procedures and results performed under Task 7.2 Sealing Simulated Leaks. In terms of our ability to seal leaks identified in the technical topical report, Analysis of Current Field Data, we were 100% successful. In regards to maintaining seal integrity after pigging operations we achieved varying degrees of success. Internal Corrosion defects proved to be the most resistant to the effects of pigging while External Corrosion proved to be the least resistant. Overall, with limitations, pressure activated sealant technology would be a viable option under the right circumstances.

Michael A. Romano

2004-09-01T23:59:59.000Z

477

Experimental study on flow and ventilation behaviours over idealised urban roughness  

Science Journals Connector (OSTI)

Flows in the urban boundary layer (UBL) are strongly affected by the inhomogeneous roughness elements at the bottom surface. In particular, in the near-ground region (roughness sublayer), the effect of the surface roughness dominates that complicates the behaviours of mean flow and turbulence and subsequently the near-wall transport processes. To safeguard the health of urban inhabitants, it is crucial to develop an in-depth understanding of the correlation among near-wall fluid motions, UBL turbulence and city ventilation. However, rather limited information is available. In this study, physical modelling in a laboratory wind tunnel is employed to measure the profiles of both stream-wise and vertical velocities over an array consisting of idealised two-dimensional (2D) roughness elements. Various arrangements are adopted in attempt to cover different flow regimes to examine city ventilation problems. The ventilation performance is measured by the air exchange rate (ACH). Consistent with our previous large-eddy simulation (LES) results, the current wind tunnel measurements suggest that city ventilation is dominated by the ACH turbulent component, i.e., air masses are mainly driven by atmospheric turbulence (at least 80% of the total ACH).

Yat-Kiu Ho; Chun-Ho Liu

2014-01-01T23:59:59.000Z

478

Final Report fir DE-SC0005507 (A1618): The Development of an Improved Cloud Microphysical Product for Model and Remote Sensing Evaluation using RACORO Observations  

SciTech Connect

We proposed to analyze data collected during the Routine Aerial Facilities (AAF) Clouds with Low Optical Water Depths (CLOWD) Optical Radiative Observations (RACORO) in order to develop an integrated product of cloud microphysical properties (number concentration of drops in different size bins, total liquid drop concentration integrated over all bin sizes, liquid water content LWC, extinction of liquid clouds, effective radius of water drops, and radar reflectivity factor) that could be used to evaluate large-eddy simulations (LES), general circulation models (GCMs) and ground-based remote sensing retrievals, and to develop cloud parameterizations with the end goal of improving the modeling of cloud processes and properties and their impact on atmospheric radiation. We have completed the development of this microphysical database. we investigated the differences in the size distributions measured by the Cloud and Aerosol Spectrometer (CAS) and the Forward Scattering Probe (FSSP), between the one dimensional cloud imaging probe (1DC) and the two-dimensional cloud imaging probe (2DC), and between the bulk LWCs measured by the Gerber probe against those derived from the size resolved probes.

McFarquhar, Greg M.

2012-09-21T23:59:59.000Z

479

Final Report on the Development of an Improved Cloud Microphysical Product for Model and Remote Sensing Evaluation using RACORO Observations  

SciTech Connect

We proposed to analyze data collected during the Routine Aerial Facilities (AAF) Clouds with Low Optical Water Depths (CLOWD) Optical Radiative Observations (RACORO) in order to develop an integrated product of cloud microphysical properties (number concentration of drops in different size bins, total liquid drop concentration integrated over all bin sizes, liquid water content LWC, extinction of liquid clouds bw, effective radius of water drops re, and radar reflectivity factor) that could be used to evaluate large-eddy simulations (LES), general circulation models (GCMs) and ground-based remote sensing retrievals, and to develop cloud parameterizations with the end goal of improving the modeling of cloud processes and properties and their impact on atmospheric radiation. We have completed the development of this microphysical database and have submitted it to ARM for consideration of its inclusion on the ARM database as a PI product. This report describes the development of this database, and also describes research that has been conducted on cloud-aerosol interactions using the data obtained during RACORO. A list of conference proceedings and publications is also included.

McFarquhar, Greg

2012-09-19T23:59:59.000Z

480

Oxydation par plasma électrolytique : influence des paramètres du procédé sur le comportement des micro-décharges et conséquences sur les couches d’oxydes.  

E-Print Network (OSTI)

??L’oxydation par plasma électrolytique (ou oxydation micro-arc) est un procédé de traitement des alliages légers (Al, Mg, V, Ti, etc.) apte à pallier les limites… (more)

Melhem, Amer

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "large-eddy simulation les" 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

Mesures expérimentales "thermodynamiques" de composés associatifs dans les mélanges de biocarburants et modélisation avec l'équation d'état PC-SAFT.  

E-Print Network (OSTI)

??Le rôle croissant des biocarburants dans le marché de l'énergie a stimulé un regain d'intérêt dans l'étude des composés oxygénés. Les avancés dans le domaine… (more)

Soo, Chien-Bin

2011-01-01T23:59:59.000Z

482

JOURNAL DE PHBIQUE Colloque C4, supplment au no 10, Tome 36, Octobre 1975,pageC4-403 COMPARAISON ENTRE LES MCANISMES DE CORROSION  

E-Print Network (OSTI)

ENTRE LES M�CANISMES DE CORROSION ET DE FRAGILISATION INTERGRANULAIRES DES M�TAUX PAR LES M�TAUX Orsay, France Résumé. -11existe peu de données relatives aux mécanismes de corrosion et de fragilisation intergranulaires (corrosion, pénétration, fragilisation) sont induits par un même mécanisme initial : l

Paris-Sud XI, Université de

483

Les populations priurbaines face l'automobile en grande couronne francilienne Population and automobile dependence in the outer suburbs of Paris  

E-Print Network (OSTI)

1 Les populations périurbaines face à l'automobile en grande couronne francilienne Population and automobile dependence in the outer suburbs of Paris Titre courant : les populations périurbaines face à l'automobile se propose d'identifier si l'automobile qui a participé au développement des espaces périurbains et

Paris-Sud XI, Université de

484

LivingColorGerdaSteiner&JrgLenzlinger-LeTempssuspendu#4HichamBerrada-LaRgledetroisStfanePerraud QUAND LES NANOSCIENCES RENCONTRENT L'ART CONTEMPORAIN  

E-Print Network (OSTI)

Berrada-LaRègledetroisStéfanePerraud QUAND LES NANOSCIENCES RENCONTRENT L'ART CONTEMPORAIN 23.09.2011 > 16.12.2011 EXPOSITION ORGANIS�E DANS Pierre et Marie Curie (UPMC), CNRS, NanoSciences Ile-de-France ____________ / VERNISSAGE / 22.09.2011 / � nanosciences. Les nanosciences constituent aujourd'hui un domaine de la recherche scientifique à caractère

van Tiggelen, Bart

485

Cartographie de la pollution de l'air : une nouvelle approche base sur la tldtection et les bases de donnes gographiques. Application , la ville de  

E-Print Network (OSTI)

1 Cartographie de la pollution de l'air : une nouvelle approche bas·e sur la t·l·d·tection et les·lisation - Ecole des Mines de Paris, Sophia Antipolis, France Résumé La qualit· de l'air dans les villes est· de l'air (MATE, 2001). La pollution atmosph·rique est aujourd'hui sensiblement r·duite par rapport

Paris-Sud XI, Université de

486

Franoise PAQUIENSEGUY-GDR Tics et Socit Autrans 20061 La question de l'innovation dans les programmes d'enseignement suprieurs  

E-Print Network (OSTI)

Françoise PAQUIENSEGUY- GDR Tics et Société ­ Autrans 20061 La question de l'innovation dans les Mots-clefs : innovation ­ dispositif ­ TICE Communication à la quatrième école dété du GDR Tics et sur les TICs dans le champ éducatif. Deux postulats émergent fortement : le premier place linnovation

Paris-Sud XI, Université de

487

Politique quant au port des lunettes de scurit dans les laboratoires d'enseignement du Dpartement de biologie.  

E-Print Network (OSTI)

Politique quant au port des lunettes de sécurité dans les laboratoires d'enseignement du Département de biologie. 1. Le port de lentilles cornéennes est permis. Le cas échéant, il faut toutefois obligatoirement en aviser un membre de l'équipe de formation pour que ce soit noté. 2. Le port des lunettes de

Vellend, Mark

488

Le texte pistolaire comme source historique : les lettres de Marie Dorval Alfred de Vigny (1833-1837),  

E-Print Network (OSTI)

préface d'André Maurois, dans la collection nrf de Gallimard, en 1953. 3 Marie Dorval, Lettres à Alfred de province figurent, aux côtés de la presse, des archives des théâtres ou des mémoires d'artistes, ces témoignages sur le vif que constituent les correspondances d'acteurs. Celles-ci sont loin d'être toutes

Boyer, Edmond

489

http://www.persee.fr Les chelles de la densification. Le peuplement de l'Egypte de 1897 1996 / Different  

E-Print Network (OSTI)

Persée http://www.persee.fr Les échelles de la densification. Le peuplement de l'Egypte de 1897 à 1996 / Different scales of density. Population growth in Egypt 1897-1996 Denis Eric Géocarrefour, Année 1998, Volume 73, Numéro 3 p. 183 - 201 Voir l'article en ligne Entre 1986 et 1996, l'Egypte se peuplait

Paris-Sud XI, Université de

490

Sur les groupes de transformations rigides : Th'eor`eme de l'orbite dense-ouverte  

E-Print Network (OSTI)

Sur les groupes de transformations rigides : Th'eor`eme de l'orbite dense.2.2 Premi`ere r'eduction du th'eor`eme de l'orbite dense-ouverte. 14 2.2.3 Passage au domaine d'int'egrabilit'e infinit'esimale. . . . . . 15 2.2.4 Deuxi`eme r'eduction du th'eor`eme de l'orbite dense

Zeghib, Abdelghani

491

LES FROMAGES DE LA SLOVAQUIE. 54T rencontrent 'au milieu de la planche. On met la fin autour du  

E-Print Network (OSTI)

,IN). Force motrice. J{rrive maintenant à la question Je la force motrice. ,Il est assez difficile de déterminer a priori l'Importance de la force-. motrice nécessaire pour tous les types d'installations, car'ins'tallation frigorifique nécessaire.La puis- ". sance motrice nécessaire pour 1.000 Iitres de lait traité, résulte duo

Paris-Sud XI, Université de

492

L'approche par les capacits et le travail Robert Salais (IDHE-ENS Cachan, Centre Marc Bloch, Berlin)  

E-Print Network (OSTI)

théorique, mis en oeuvre et approfondis par Amartya Sen depuis les années 1980. L'effort consiste à engager une revisite du domaine du travail à partir de ces recherches d'Amartya Sen, entreprise à laquelle européens depuis le début des années 20003. Mon propos n'est pas d'appliquer Sen, mais de développer une

Paris-Sud XI, Université de

493

Variabilit naturelle des souches du virus Y de la pomme de terre dans les cultures de piment  

E-Print Network (OSTI)

pathotype zéro PVY-0, le PVY-1 est virulent sur la variété de piment « Yolo Y », le PVY-1-2 est virulent sur les variétés « Yolo Y» et « Florida VR-2 ». D'autre part, une étroite homologie des propriétés. Pathotype-1, (PVY-1) : strains infecting 'Bastidon', 'Yolo Y' and related varieties. Pathotype-2, (PVY-1

Boyer, Edmond

494

THERM NFRC Simulation Manual  

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

/ WINDOW 6.3 / WINDOW 6.3 NFRC Simulation Manual Lawrence Berkeley National Laboratory July 2013 DISCLAIMER This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor The Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal 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 its trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement,

495

LSST beam simulator  

Science Journals Connector (OSTI)

It is always important to test new imagers for a mosaic camera before device acceptance and constructing the mosaic. This is particularly true of the LSST CCDs due to the fast beam illumination: at long wavelengths there can be significant beam divergence (defocus) inside the silicon because of the long absorption length for photons near the band gap. Moreover, realistic sky scenes need to be projected onto the CCD focal plane Thus, we need to design and build an f/1.2 re-imaging system. The system must simulate the entire LSST1 operation, including a sky with galaxies and stars with approximately black-body spectra superimposed on a spatially diffuse night sky emission with its complex spectral features.

J A Tyson; J Sasian; C Claver; G Muller; K Gilmor; M Klint

2014-01-01T23:59:59.000Z

496

Dynamic simulation of Odoo  

Science Journals Connector (OSTI)

Abstract The thermal habits of Odoo were examined and energy consumption data were also predicted. Special tests were performed for the time of the competition, and whole year was also analysed. The climatic data were of Madrid as the competition took place there. The modelling environment was MATLAB's Simulink with a built-in module of Simscape. It is for especially examining thermal behaviours. MATLAB itself is capable of solving differential equations by time, for this reason dynamic simulations can be performed. First the building structure was created, and then the heatflows affecting the internal temperature were added. In this paper detailed process of creating the model is presented, and some results are discussed, including some possibilities of further improvements.

Gábor Haas-Schnabel; Csaba Szikra

2014-01-01T23:59:59.000Z

497

Environmental gaming simulation network  

Science Journals Connector (OSTI)

This paper describes the construction of an infrastructure for global peace gaming, in particular on the issue of environmental and sustainable development in Third World countries. The gaming is intended to train would-be decision-makers in crisis management, conflict resolution and negotiation techniques. Experience shows that the expertise necessary to participate in peace games does not exist in many parts of the world. To help educate future participants, and to promote the cause of peace by enhancing exchanges of education and joint research, the Global Systems Analysis and Simulation (GLOSAS) Project is attempting to create a global (electronic) university consortium. This paper provides a brief account of the steps taken over the past 12 years which have led to the development of the Global University now being organised to meet the challenge of global issues both today and in the 21st century.

Takeshi Utsumi; Philip S. Gang

1991-01-01T23:59:59.000Z

498

Lattice Boltzmann Simulation Optimization  

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

Boltzmann Boltzmann Simulation Optimization on Leading Multicore Platforms Selected as Best Paper in Application Track, IPDPS 2008, April 14-28, Miami, Florida, USA Samuel Williams † , Jonathan Carter , Leonid Oliker John Shalf , Katherine Yelick † CRD/NERSC, Lawrence Berkeley National Laboratory Berkeley, CA 94720 † CS Division, University of California at Berkeley, Berkeley, CA 94720 {SWWilliams, JTCarter, LOliker, JShalf, KAYelick}@lbl.gov Abstract We present an auto-tuning approach to optimize ap- plication performance on emerging multicore architec- tures. The methodology extends the idea of search- based performance optimizations, popular in linear al- gebra and FFT libraries, to application-specific com- putational kernels. Our work applies this strategy to a lattice Boltzmann application (LBMHD) that histor- ically has made poor use of scalar microprocessors

499

Non-detonable explosive simulators  

DOE Patents (OSTI)

A simulator which is chemically equivalent to an explosive, but is not detonable. The simulator has particular use in the training of explosives detecting dogs and calibrating sensitive analytical instruments. The explosive simulants may be fabricated by different techniques, a first involves the use of standard slurry coatings to produce a material with a very high binder to explosive ratio without masking the explosive vapor, and the second involves coating inert beads with thin layers of explosive molecules. 5 figs.

Simpson, R.L.; Pruneda, C.O.

1994-11-01T23:59:59.000Z

500

Non-detonable explosive simulators  

DOE Patents (OSTI)

A simulator which is chemically equivalent to an explosive, but is not detonable. The simulator has particular use in the training of explosives detecting dogs and calibrating sensitive analytical instruments. The explosive simulants may be fabricated by different techniques, a first involves the use of standard slurry coatings to produce a material with a very high binder to explosive ratio without masking the explosive vapor, and the second involves coating inert beads with thin layers of explosive molecules.

Simpson, Randall L. (Livermore, CA); Pruneda, Cesar O. (Livermore, CA)

1994-01-01T23:59:59.000Z