Sample records for large-eddy simulation les

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

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Advanced Engine Combustion Research Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research 2012 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies...

  2. Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine...

    Office of Environmental Management (EM)

    Large Eddy Simulation (LES) Applied to LTCDieselHydrogen Engine Combustion Research Large Eddy Simulation (LES) Applied to LTCDieselHydrogen Engine Combustion Research 2009 DOE...

  3. Large Eddy Simulation (LES) Applied to Low-Temperature and Diesel...

    Broader source: Energy.gov (indexed) [DOE]

    Combustion Research Large Eddy Simulation (LES) Applied to Low-Temperature and Diesel Engine Combustion Research 2011 DOE Hydrogen and Fuel Cells Program, and Vehicle...

  4. Vehicle Technologies Office Merit Review 2015: Large Eddy Simulation...

    Office of Environmental Management (EM)

    Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research Vehicle Technologies Office Merit Review 2015: Large Eddy Simulation (LES) Applied to Advanced Engine...

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

    Broader source: Energy.gov [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. Flame Stability Analysis in an Ultra Compact Combustor Using Large-Eddy Simulation

    E-Print Network [OSTI]

    Raman, Venkat

    Flame Stability Analysis in an Ultra Compact Combustor Using Large-Eddy Simulation C. Lietz , C Base, Ohio 45433 Large eddy simulation (LES) of an experimental ultra-compact combustor (UCC as a conven- tional combustor path. In order to reduce the penalty due to increased weight of these burners

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

    E-Print Network [OSTI]

    Apte, Sourabh V.

    Large-eddy simulation of swirling particle-laden flows in a coaxial-jet combustor S.V. Apte a,* , K 2003 Abstract Large-eddy simulation (LES) of particle-laden, swirling flow in a coaxial-jet combustor;cyclone combustors, and biomass gasifiers (Lefebvre, 1989). The physics of such flows is extremely complex

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

    E-Print Network [OSTI]

    Chen, Qingyan "Yan"

    1 Study of natural ventilation in buildings by large eddy simulation Yi Jiang and Qingyan Chen 02139 *Phone: (617) 253-7714, Fax: (617) 253-6152, Email: qchen@mit.edu Abstract Natural ventilation in the mechanical ventilation systems. Two subgrid-scale models of large eddy simulation (LES), a Smagorinsky

  9. Applications of large eddy simulation methods to gyrokinetic turbulence

    SciTech Connect (OSTI)

    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

    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.

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

    E-Print Network [OSTI]

    Li, Xian-Xiang

    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 ...

  11. Calculation of unsteady turbulent flow around obstacles using the large eddy simulation turbulence model

    E-Print Network [OSTI]

    Helton, Donald McLean

    2002-01-01T23:59:59.000Z

    The premise of the work presented here is to use a common analytical tool, Computational Fluid Dynamics (CFD), along with a prevalent turbulence model, Large Eddy Simulation (LES), to study the flow past rectangular cylinders. In an attempt to use...

  12. Implicit Large Eddy Simulation of Cavitation in Micro Channel Flows

    E-Print Network [OSTI]

    Hickel, S; Schmidt, S J

    2014-01-01T23:59:59.000Z

    We present a numerical method for Large Eddy Simulations (LES) of compressible two-phase flows. The method is validated for the flow in a micro channel with a step-like restriction. This setup is representative for typical cavitating multi-phase flows in fuel injectors and follows an experimental study of Iben et al., 2010. While a diesel-like test fuel was used in the experiment, we solve the compressible Navier-Stokes equations with a barotropic equation of state for water and vapor and a simple phase-change model based on equilibrium assumptions. Our LES resolve all wave dynamics in the compressible fluid and the turbulence production in shear layers.

  13. Large-Eddy Simulation of Wind-Plant Aerodynamics: Preprint

    SciTech Connect (OSTI)

    Churchfield, M. J.; Lee, S.; Moriarty, P. J.; Martinez, L. A.; Leonardi, S.; Vijayakumar, G.; Brasseur, J. G.

    2012-01-01T23:59:59.000Z

    In this work, we present results of a large-eddy simulation of the 48 multi-megawatt turbines composing the Lillgrund wind plant. Turbulent inflow wind is created by performing an atmospheric boundary layer precursor simulation and turbines are modeled using a rotating, variable-speed actuator line representation. The motivation for this work is that few others have done wind plant large-eddy simulations with a substantial number of turbines, and the methods for carrying out the simulations are varied. We wish to draw upon the strengths of the existing simulations and our growing atmospheric large-eddy simulation capability to create a sound methodology for performing this type of simulation. We have used the OpenFOAM CFD toolbox to create our solver.

  14. Mesoscale and Large-Eddy Simulations for Wind Energy

    SciTech Connect (OSTI)

    Marjanovic, N

    2011-02-22T23:59:59.000Z

    Operational wind power forecasting, turbine micrositing, and turbine design require high-resolution simulations of atmospheric flow over complex terrain. The use of both Reynolds-Averaged Navier Stokes (RANS) and large-eddy (LES) simulations is explored for wind energy applications using the Weather Research and Forecasting (WRF) model. To adequately resolve terrain and turbulence in the atmospheric boundary layer, grid nesting is used to refine the grid from mesoscale to finer scales. This paper examines the performance of the grid nesting configuration, turbulence closures, and resolution (up to as fine as 100 m horizontal spacing) for simulations of synoptically and locally driven wind ramping events at a West Coast North American wind farm. Interestingly, little improvement is found when using higher resolution simulations or better resolved turbulence closures in comparison to observation data available for this particular site. This is true for week-long simulations as well, where finer resolution runs show only small changes in the distribution of wind speeds or turbulence intensities. It appears that the relatively simple topography of this site is adequately resolved by all model grids (even as coarse as 2.7 km) so that all resolutions are able to model the physics at similar accuracy. The accuracy of the results is shown in this paper to be more dependent on the parameterization of the land-surface characteristics such as soil moisture rather than on grid resolution.

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

    E-Print Network [OSTI]

    Nicoud, Franck

    Assessment of combustion noise in a premixed swirled combustor via Large-Eddy Simulation Camilo F noise is conducted by both direct (LES) and hybrid computations in a premixed swirled combustor. Some­5] as well as to more complex cases such as gas turbine combustors [6]. Computational techniques

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

    E-Print Network [OSTI]

    Boyer, Edmond

    Assessment of combustion noise in a premixed swirled combustor via Large-eddy simulation Camilo F direct (LES) and hybrid computations in a premixed swirled combustor. Some comparisons of the sound, 4, 5] as well as to more complex cases such as gas turbine combustors. [6] Corresponding author. Ph

  17. Wind Energy-Related Atmospheric Boundary Layer Large-Eddy Simulation Using OpenFOAM: Preprint

    SciTech Connect (OSTI)

    Churchfield, M.J.; Vijayakumar, G.; Brasseur, J.G.; Moriarty, P.J.

    2010-08-01T23:59:59.000Z

    This paper develops and evaluates the performance of a large-eddy simulation (LES) solver in computing the atmospheric boundary layer (ABL) over flat terrain under a variety of stability conditions, ranging from shear driven (neutral stratification) to moderately convective (unstable stratification).

  18. Experimental validation of large eddy simulations of flow and heat transfer in a stationary ribbed duct

    E-Print Network [OSTI]

    Thole, Karen A.

    Elsevier Inc. All rights reserved. Keywords: Duct flow; Ribbed channels; LES 1. Introduction In an effortExperimental validation of large eddy simulations of flow and heat transfer in a stationary ribbed Abstract Accurate prediction of ribbed duct flow and heat transfer is of importance to the gas turbine

  19. Large-eddy simulation of multiphase flows in complex combustors

    E-Print Network [OSTI]

    Mahesh, Krishnan

    Large-eddy simulation of multiphase flows in complex combustors S. V. Apte1 , K. Mahesh2 , F. Ham1 to accurately predict reacting multi-phase flows in practical combustors involving complex physical phenomena-turbine combustor geometries to evaluate the predictions made for multiphase, turbulent flow. 1 Introduction

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

    SciTech Connect (OSTI)

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

    2008-09-08T23:59:59.000Z

    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.

  1. Adaptively refined large eddy simulations of clusters

    E-Print Network [OSTI]

    Maier, A; Schmidt, W; Niemeyer, J C

    2009-01-01T23:59:59.000Z

    We present a numerical scheme for modelling unresolved turbulence in cosmological adaptive mesh refinement codes. As a first application, we study the evolution of turbulence in the intra-cluster medium and in the core of a galaxy cluster. Simulations with and without subgrid scale model are compared in detail. Since the flow in the ICM is subsonic, the global turbulent energy contribution at the unresolved length scales is smaller than 1% of the internal energy. We find that the production of turbulence is closely correlated with merger events occurring in the cluster environment, and its dissipation locally affects the cluster energy budget. Because of this additional source of dissipation, the core temperature is larger and the density is smaller in the presence of subgrid scale turbulence than in the standard adiabatic run, resulting in a higher entropy core value.

  2. Using Large Eddy Simulation to Study Airflows in and around Buildings Yi Jiang, Ph.D. Mingde Su, Ph.D. Qingyan Chen, Ph.D.*

    E-Print Network [OSTI]

    Chen, Qingyan "Yan"

    1 Using Large Eddy Simulation to Study Airflows in and around Buildings Yi Jiang, Ph.D. Mingde Su-scale models of large eddy simulation (LES) to study airflows in and around buildings. They are the Smagorinsky, studies of airflow around a building often use wind tunnels that could simulate wind conditions. Notable

  3. Measurements and large eddy simulation of propagating premixed flames

    SciTech Connect (OSTI)

    Masri, A.R.; Cadwallader, B.J. [School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006 (Australia); Ibrahim, S.S. [Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough LE11 3TU (United Kingdom)

    2006-07-15T23:59:59.000Z

    This paper presents an experimental and numerical study of unsteady turbulent premixed flames igniting in an initially stagnant mixture and propagating past solid obstacles. The objective here is to study the outstanding issue of flow-flame interactions in transient premixed combustion environments. Particular emphasis is placed on the burning rate and the structure of the flame front. The experimental configuration consists of a chamber with a square cross-section filled with a combustible mixture of propane-air ignited from rest. An array of baffle plates as well as geometrical obstructions of varying shapes and blockage ratios, are placed in the path of the flame as it propagates from the ignition source to the vented end of the enclosure. A range of flame propagation conditions are studied experimentally. Measurements are presented for pressure-time traces, high-speed images of the flame front, mean velocities obtained from particle imaging velocimetry and laser induced fluorescence images of the hydroxyl radical OH. Three-dimensional large eddy simulations (LES) are also made for a case where a square obstacle and an array of baffle plates are placed in the chamber. The dynamic Germano model and a simple flamelet combustion model are used at the sub-grid scale. The effects of grid size and sub-grid filter width are also discussed. Calculations and measurements are found to be in good agreement with respect to flame structure and peak overpressure. Turbulence levels increase significantly at the leading edge of the flame as it propagates past the array of baffle plates and the obstacle. With reference to the regime diagrams for turbulent premixed combustion, it is noted that the flame continues to lie in the zones of thin reactions or corrugated flamelets regardless of the stage of propagation along the chamber. (author)

  4. Congrs Franais de Mcanique Grenoble, 27-31 aot 2007 Large Eddy Simulation and experimentation in an

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    between the rotor and the stator have been attributed to the effects of the radial convective transport ­ France Abstract: Comparisons between Large Eddy Simulation (LES) and velocity measurements have been mesures de vitesse par anémométrie laser Doppler à deux composantes. Le code LES est basé sur une méthode

  5. Hydrodynamic and hydromagnetic energy spectra from large eddy simulations

    E-Print Network [OSTI]

    N. E. L. Haugen; A. Brandenburg

    2006-06-29T23:59:59.000Z

    Direct and large eddy simulations of hydrodynamic and hydromagnetic turbulence have been performed in an attempt to isolate artifacts from real and possibly asymptotic features in the energy spectra. It is shown that in a hydrodynamic turbulence simulation with a Smagorinsky subgrid scale model using 512^3 meshpoints two important features of the 4096^3 simulation on the Earth simulator (Kaneda et al. 2003, Phys. Fluids 15, L21) are reproduced: a k^{-0.1} correction to the inertial range with a k^{-5/3} Kolmogorov slope and the form of the bottleneck just before the dissipative subrange. Furthermore, it is shown that, while a Smagorinsky-type model for the induction equation causes an artificial and unacceptable reduction in the dynamo efficiency, hyper-resistivity yields good agreement with direct simulations. In the large-scale part of the inertial range, an excess of the spectral magnetic energy over the spectral kinetic energy is confirmed. However, a trend towards spectral equipartition at smaller scales in the inertial range can be identified. With magnetic fields, no explicit bottleneck effect is seen.

  6. Large-eddy simulation of a wind turbine wake in turbulent

    E-Print Network [OSTI]

    Firestone, Jeremy

    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

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

    E-Print Network [OSTI]

    Stevens, Richard J A M

    2014-01-01T23:59:59.000Z

    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...

  8. Examination of steam generator turbulence by large eddy simulation

    E-Print Network [OSTI]

    Bagwell, Ted Glyn

    1989-01-01T23:59:59.000Z

    phenomenon in which the vortex shedding frequency is equal to the acoustic frequency. This is primarily a problem in gas heat exchangers. This work is a continuation of work started by the Electrical Power Research Institute (EPRI), wherein the LES.... The two ongoing computer simulations are in the k- c modeling (ATHOS) (EPRI 1988a; EPRI 1988e) and the LES modeling (GUST) (EPRI 1988f; EPRI 1988e; Chilukuri et al. 1987). Both of these codes have been used to calculate the flow in both the model D-4...

  9. 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

  10. Large-eddy simulation of turbulent cavitating flow in a micro channel

    SciTech Connect (OSTI)

    Egerer, Christian P., E-mail: christian.egerer@aer.mw.tum.de; Hickel, Stefan; Schmidt, Steffen J.; Adams, Nikolaus A. [Institute of Aerodynamics and Fluid Mechanics, Technische Universität München, Boltzmannstr. 15, 85748 Garching bei München (Germany)

    2014-08-15T23:59:59.000Z

    Large-eddy simulations (LES) of cavitating flow of a Diesel-fuel-like fluid in a generic throttle geometry are presented. Two-phase regions are modeled by a parameter-free thermodynamic equilibrium mixture model, and compressibility of the liquid and the liquid-vapor mixture is taken into account. The Adaptive Local Deconvolution Method (ALDM), adapted for cavitating flows, is employed for discretizing the convective terms of the Navier-Stokes equations for the homogeneous mixture. ALDM is a finite-volume-based implicit LES approach that merges physically motivated turbulence modeling and numerical discretization. Validation of the numerical method is performed for a cavitating turbulent mixing layer. Comparisons with experimental data of the throttle flow at two different operating conditions are presented. The LES with the employed cavitation modeling predicts relevant flow and cavitation features accurately within the uncertainty range of the experiment. The turbulence structure of the flow is further analyzed with an emphasis on the interaction between cavitation and coherent motion, and on the statistically averaged-flow evolution.

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

    E-Print Network [OSTI]

    Chen, Qingyan "Yan"

    simulation Yi Jiang and Qingyan Chen* Building Technology Program Massachusetts Institute of Technology 77 direction on cross natural ventilation in building from large eddy simulation," Building and Environment, 37 in many industrial applications. To simulate natural ventilation in buildings, however, RANS modeling has

  12. Large-eddy Simulation of Realistic Gas Turbine Combustors , & Apte, S. V.

    E-Print Network [OSTI]

    Apte, Sourabh V.

    Large-eddy Simulation of Realistic Gas Turbine Combustors Moin, P. , & Apte, S. V. Center models and the numerical scheme is performed in canonical and complex combustor geometries. Finally, a multi-scale, multi-physics, turbulent reacting flow simulation in a real gas-turbine combustor

  13. Large eddy simulation of extinction and reignition with artificial neural networks based chemical kinetics

    SciTech Connect (OSTI)

    Sen, Baris Ali; Menon, Suresh [School of Aerospace Engineering, Georgia Institute of Technology, 270 Ferst Drive, Atlanta, GA 30332-0150 (United States); Hawkes, Evatt R. [School of Photovoltaic and Renewable Energy Engineering, The University of New South Wales, NSW 2052 (Australia); School of Mechanical and Manufacturing Engineering, The University of New South Wales, NSW 2052 (Australia)

    2010-03-15T23:59:59.000Z

    Large eddy simulation (LES) of a non-premixed, temporally evolving, syngas/air flame is performed with special emphasis on speeding-up the sub-grid chemistry computations using an artificial neural networks (ANN) approach. The numerical setup for the LES is identical to a previous direct numerical simulation (DNS) study, which reported considerable local extinction and reignition physics, and hence, offers a challenging test case. The chemical kinetics modeling with ANN is based on a recent approach, and replaces the stiff ODE solver (DI) to predict the species reaction rates in the subgrid linear eddy mixing (LEM) model based LES (LEMLES). In order to provide a comprehensive evaluation of the current approach, additional information on conditional statistics of some of the key species and temperature are extracted from the previous DNS study and are compared with the LEMLES using ANN (ANN-LEMLES, hereafter). The results show that the current approach can detect the correct extinction and reignition physics with reasonable accuracy compared to the DNS. The syngas flame structure and the scalar dissipation rate statistics obtained by the current ANN-LEMLES are provided to further probe the flame physics. It is observed that, in contrast to H{sub 2}, CO exhibits a smooth variation within the region enclosed by the stoichiometric mixture fraction. The probability density functions (PDFs) of the scalar dissipation rates calculated based on the mixture fraction and CO demonstrate that the mean value of the PDF is insensitive to extinction and reignition. However, this is not the case for the scalar dissipation rate calculated by the OH mass fraction. Overall, ANN provides considerable computational speed-up and memory saving compared to DI, and can be used to investigate turbulent flames in a computationally affordable manner. (author)

  14. Large Eddy Simulation Analysis of Flow Field Inside a High-g Combustor

    E-Print Network [OSTI]

    Raman, Venkat

    Large Eddy Simulation Analysis of Flow Field Inside a High-g Combustor C. Heye , C. Lietz , J-compact combustors (UCC) are a technology for reducing the size of combustors. In these combustors the fuel and air results exhibit significant entrainment of fuel into recirculation zones inside the combustor, however

  15. Computing combustion noise by combining Large Eddy Simulations with analytical models for the propagation of waves

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Computing combustion noise by combining Large Eddy Simulations with analytical models +++++ Presented by Ignacio Duran Abstract Two mechanisms control combustion noise generation as shown by Marble. A method to calculate combustion-generated noise has been implemented in a tool called CHORUS. The method

  16. Large Eddy Simulation of Supersonic Combustion using Direct Quadrature Method of Moments

    E-Print Network [OSTI]

    Raman, Venkat

    . Supersonic combustion involves the interaction of complex gas-phase chemical reactions in a compressible flowLarge Eddy Simulation of Supersonic Combustion using Direct Quadrature Method of Moments Pratik modeling problem. In supersonic combustion, typical closures based on conserved scalar approaches cannot

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

    E-Print Network [OSTI]

    Camp, Joshua Lane

    2012-07-16T23:59:59.000Z

    The average and fluctuating components in a model ring-type gas turbine combustor are characterized using a Large Eddy Simulation at a Reynolds number of 11,000, based on the bulk velocity and the mean channel height. A spatial filter is applied...

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

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Numerical Investigation of a Transverse Jet in a Supersonic Crossflow using Large Eddy Simulation injected fuel jets in hot supersonic crossflows. This paper describes the numerical algorithm being used into a supersonic crossflow computed on a coarse mesh. These results are discussed and similarity

  19. Conjugate Heat Transfer with Large Eddy Simulation for Gas Turbine Components.

    E-Print Network [OSTI]

    Nicoud, Franck

    Conjugate Heat Transfer with Large Eddy Simulation for Gas Turbine Components. Florent Duchaine constraint for GT (gas turbines). Most existing CHT tools are developped for chained, steady phenomena. A film-cooled turbine vane is then studied. Thermal conduction in the blade implies lower wall

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

    E-Print Network [OSTI]

    Uranga Cabrera, Alejandra (Uranga)

    2011-01-01T23:59:59.000Z

    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 ...

  1. Large-eddy Simulation of the Nighttime Stable Atmospheric Boundary Layer

    E-Print Network [OSTI]

    Zhou, Bowen

    2012-01-01T23:59:59.000Z

    eddy Simulation of Wind-turbine Wakes: Evaluation of Turbineperformed LES of wind-turbine wakes in neutrally stratified

  2. Large-eddy simulations of isolated disc galaxies with thermal and turbulent feedback

    E-Print Network [OSTI]

    Braun, Harald; Niemeyer, Jens C; Almgren, Ann S

    2014-01-01T23:59:59.000Z

    We present a subgrid-scale model for the Multi-phase Interstellar medium, Star formation, and Turbulence (MIST) and explore its behaviour in high-resolution large-eddy simulations of isolated disc galaxies. MIST follows the evolution of a clumpy cold and a diffuse warm component of the gas within a volume element which exchange mass and energy via various cooling, heating and mixing processes. The star formation rate is dynamically computed from the state of the gas in the cold phase. An important feature of MIST is the treatment of unresolved turbulence in the two phases and its interaction with star formation and feedback by supernovae. This makes MIST a particularly suitable model for the interstellar medium in galaxy simulations. We carried out a suite of simulations varying fundamental parameters of our feedback implementation. Several observational properties of galactic star formation are reproduced in our simulations, such as an average star formation efficiency ~1%, a typical velocity dispersion arou...

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

    SciTech Connect (OSTI)

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

    2013-08-16T23:59:59.000Z

    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.

  4. Large Eddy Simulation studies of the effects of alignment and wind farm length

    E-Print Network [OSTI]

    Stevens, Richard J A M; Meneveau, Charles

    2014-01-01T23:59:59.000Z

    Large eddy simulations of wind farms are performed to study the effects of wind turbine row alignment with respect to the incoming flow direction. Various wind farms with fixed stream-wise spacing (7.85 rotor diameters) and varying lateral displacements and span-wise turbine spacings are considered, for a fixed inflow direction. Simulations show that, contrary to common belief, a perfectly staggered (checker-board) configuration does not necessarily give the highest average power output. Instead, the highest mean wind farm power output is found to depend on several factors, the most important one being the alignment that leads to minimization of wake effects from turbines in several upstream rows. This alignment typically occurs at significantly smaller angles than those corresponding to perfect staggering. The observed trends have implications for wind farm designs, especially in sites with a well-defined prevailing wind direction.

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

    E-Print Network [OSTI]

    Mittal, Rajat

    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

  6. A concurrent precursor inflow method for Large Eddy Simulations and applications to finite length wind farms

    E-Print Network [OSTI]

    Stevens, Richard J A M; Meneveau, Charles

    2014-01-01T23:59:59.000Z

    In order to enable simulations of developing wind turbine array boundary layers with highly realistic inflow conditions a concurrent precursor method for Large Eddy Simulations is proposed. In this method we consider two domains simultaneously, i.e. in one domain a turbulent Atmospheric Boundary Layer (ABL) without wind turbines is simulated in order to generate the turbulent inflow conditions for a second domain in which the wind turbines are placed. The benefit of this approach is that a) it avoids the need for large databases in which the turbulent inflow conditions are stored and the correspondingly slow I/O operations and b) we are sure that the simulations are not negatively affected by statically swept fixed inflow fields or synthetic fields lacking the proper ABL coherent structures. Sample applications are presented, in which, in agreement with field data a strong decrease of the power output of downstream wind-turbines with respect to the first row of wind-turbines is observed for perfectly aligned ...

  7. Large Eddy Simulation of the Diurnal Cycle in Southeast Pacific Stratocumulus

    SciTech Connect (OSTI)

    Caldwell, P; Bretherton, C

    2008-03-03T23:59:59.000Z

    This paper describes a series of 6 day large eddy simulations of a deep, sometimes drizzling stratocumulus-topped boundary layer based on forcings from the East Pacific Investigation of Climate (EPIC) 2001 field campaign. The base simulation was found to reproduce the observed mean boundary layer properties quite well. The diurnal cycle of liquid water path was also well captured, although good agreement appears to result partially from compensating errors in the diurnal cycles of cloud base and cloud top due to overentrainment around midday. At other times of the day, entrainment is found to be proportional to the vertically-integrated buoyancy flux. Model stratification matches observations well; turbulence profiles suggest that the boundary layer is always at least somewhat decoupled. Model drizzle appears to be too sensitive to liquid water path and subcloud evaporation appears to be too weak. Removing the diurnal cycle of subsidence had little effect on simulated cloud albedo. Simulations with changed droplet concentration and drizzle susceptibility showed large liquid water path differences at night, but differences were quite small at midday. Droplet concentration also had a significant impact on entrainment, primarily through droplet sedimentation feedback rather than through drizzle processes.

  8. Large-eddy simulations of turbulent flow for grid-to-rod fretting in nuclear reactors

    E-Print Network [OSTI]

    Bakosi, J; Lowrie, R B; Pritchett-Sheats, L A; Nourgaliev, R R

    2013-01-01T23:59:59.000Z

    The grid-to-rod fretting (GTRF) problem in pressurized water reactors is a flow-induced vibration problem that results in wear and failure of the fuel rods in nuclear assemblies. In order to understand the fluid dynamics of GTRF and to build an archival database of turbulence statistics for various configurations, implicit large-eddy simulations of time-dependent single-phase turbulent flow have been performed in 3x3 and 5x5 rod bundles with a single grid spacer. To assess the computational mesh and resolution requirements, a method for quantitative assessment of unstructured meshes with no-slip walls is described. The calculations have been carried out using Hydra-TH, a thermal-hydraulics code developed at Los Alamos for the Consortium for Advanced Simulation of Light water reactors, a United States Department of Energy Innovation Hub. Hydra-TH uses a second-order implicit incremental projection method to solve the single-phase incompressible Navier-Stokes equations. The simulations explicitly resolve the la...

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

    Broader source: Energy.gov (indexed) [DOE]

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

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

    Broader source: Energy.gov (indexed) [DOE]

    Flow Research - 8353 Combustion Chemistry - 8362 Engine Combustion - 8365 ThermalFluid Science and Engineering * Professor W. Anderson, Purdue * Professor J. -Y. Chen, UC...

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

    Broader source: Energy.gov (indexed) [DOE]

    3 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting ace007oefelein2013o.pdf More Documents & Publications...

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

    Broader source: Energy.gov [DOE]

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

  13. Vehicle Technologies Office Merit Review 2015: Large Eddy Simulation (LES)

    Broader source: Energy.gov (indexed) [DOE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn AprilA group current C3EDepartmentDepartment ofConstruction || DepartmentTesting

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

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't YourTransport(FactDepartment ofLetter Report:40PM toLEDControl Concept |EnergyLandscapingThe|

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

    E-Print Network [OSTI]

    Creech, Angus; Maguire, A Eoghan

    2014-01-01T23:59:59.000Z

    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 ...

  16. LARGE EDDY SIMULATION/EULERIAN PROBABILITY DENSITY FUNCTION APPROACH FOR SIMULATING HYDROGEN-ENRICHED GAS TURBINE

    E-Print Network [OSTI]

    Raman, Venkat

    while the small-scale motions are modeled using sub-filter models. Since gas-turbine relevant combustion providing better input for the combustion models. Developing LES-based combustion models for stationary gas) based approach is used here to deal with the complexities of gas turbine combustion. In the PDF approach

  17. Natural Ventilation in Buildings: Measurement in a Wind Tunnel and Numerical Simulation with Large Eddy Simulation

    E-Print Network [OSTI]

    Chen, Qingyan "Yan"

    save energy consumed by the heating, ventilating, and air- conditioning systems in a building1 Natural Ventilation in Buildings: Measurement in a Wind Tunnel and Numerical Simulation@purdue.edu Abstract Natural ventilation in buildings can create a comfortable and healthy indoor environment, and can

  18. The `Multifractal Model' of Turbulence and {\\em A Priori} Estimates in Large-Eddy Simulation, I. Subgrid Flux and Locality of Energy Transfer

    E-Print Network [OSTI]

    Gregory L. Eyink

    1996-02-19T23:59:59.000Z

    We establish and discuss {\\em a priori} estimates on subgrid stress and subgrid flux for filtering schemes used in the turbulence modelling method of Large-Eddy Simulation (LES). Our estimates are derived as rigorous consequences of the exact subgrid stress formulae from Navier-Stokes equations under realistic conditions for inertial-range velocity fields, those conjectured in the Parisi-Frisch ``multifractal model.'' The estimates are shown to be an expression of ``local energy cascade,'' i.e. the dominance of local wavevector triads in the energy transfer. We prove that for nearly any reasonable filter function the LES method defines an energy flux in which local triads dominate in individual realizations, due to cancellation of distant triadic contributions by detailed conservation. A somewhat similar observation of Leslie and Quarini on graded filters in the EDQNM closure is shown to be unrelated to the cancellation we establish in Navier-Stokes solutions. The sharp Fourier cutoff filter is one example which does not satisfy the modest conditions of our proof and, in fact, we show that with that filter the energy transfer in individual realizations at arbitrarily high Reynolds number will be dominated by nonlocal, convective sweeping.

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

    E-Print Network [OSTI]

    Ibrahim, Wael Abdul-Hamid

    1994-01-01T23:59:59.000Z

    using both models. The results are then compared with the experimental data obtained previously from the experiment conducted at the Electrical Power Research Institute (EPRI NP-5540, May 1988b). For the purpose of completeness, LES is further used...

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

    E-Print Network [OSTI]

    Raman, Venkat

    Crossflow Sin Hyen Kim , Optimulation, LLC., Austin, Texas, 78731, USA Pratik Donde , Venkat Raman crossflow (JISC) provide e cient mixing and flame stabilization in su- personic combustion. A LES-DQMOM based comprehensive methodology was developed and calculated sonic jet in Mach 2.0 crossflow

  1. Evaluating Subgrid-Scale Models for Large-Eddy Simulation of Turbulent Katabatic Flow

    E-Print Network [OSTI]

    Fedorovich, Evgeni

    of LES for reproducing stably-stratified turbulent boundary layers [2]. Under stably-stratified conditions, the characteristic length scale of the small-scale turbulent motions decrease, placing a larger analytically for a laminar slope flow in a stably- stratified environment. The Prandtl solution

  2. 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]

    Attinger, Daniel

    in e.g. nuclear power plants. In the present work, the mixing of a hot and a cold fluid streamLarge-eddy simulations of structure effects of an upstream elbow main pipe on hot and cold fluids Fuel Injection Equipment Stock Co., Ltd., Beijing 100166, China c Department of Mechanical Engineering

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

    SciTech Connect (OSTI)

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

    2012-07-01T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

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

    2011-07-01T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

    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

    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.

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

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    the temperature and pressure levels reached in the combustor, and therefore the engine efficiency. Numerical simulations of the thermal interaction between fluid flows and solids offer new design paths to diminish converge to steady thermal states. There are two basic approaches to solve Conjugate Heat Transfer (CHT

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

    E-Print Network [OSTI]

    and is coupled with an actuator line model to simulate the effects of the rotating wind turbine blades. A control that is capable of resolving wind turbine blades as rotat- ing actuator lines (not fixed disks) and does not rely by the spacing between wind turbines (along and across the prevailing wind direction) and by their alignment

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

    E-Print Network [OSTI]

    generation, gas turbines have gained an increasing role over the years. New emission regulations and growing SIMULATIONS OF MULTIBURNER CONFIGURATIONS IN INDUSTRIAL GAS TURBINES G. Staffelbach , L. Y. M. Gicquel and T. A single burner periodic sector and a triple burner sector of an annular combustion chamber of a gas

  9. A Large Eddy Simulation of Turbulent Compressible Convection: Differential Rotation in the Solar Convection Zone

    E-Print Network [OSTI]

    Francis J. Robinson; Kwing L. Chan

    2000-11-21T23:59:59.000Z

    We present results of two simulations of the convection zone, obtained by solving the full hydrodynamic equations in a section of a spherical shell. The first simulation has cylindrical rotation contours (parallel to the rotation axis) and a strong meridional circulation, which traverses the entire depth. The second simulation has isorotation contours about mid-way between cylinders and cones, and a weak meridional circulation, concentrated in the uppermost part of the shell. We show that the solar differential rotation is directly related to a latitudinal entropy gradient, which pervades into the deep layers of the convection zone. We also offer an explanation of the angular velocity shear found at low latitudes near the top. A non-zero correlation between radial and zonal velocity fluctuations produces a significant Reynolds stress in that region. This constitutes a net transport of angular momentum inwards, which causes a slight modification of the overall structure of the differential rotation near the top. In essence, the {\\it thermodynamics controls the dynamics through the Taylor-Proudman momentum balance}. The Reynolds stresses only become significant in the surface layers, where they generate a weak meridional circulation and an angular velocity `bump'.

  10. Large eddy simulation of soot formation in a turbulent non-premixed jet flame

    SciTech Connect (OSTI)

    El-Asrag, Hossam [Center For Turbulence Research, Stanford, CA 94305 (United States); Menon, Suresh [School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332 (United States)

    2009-02-15T23:59:59.000Z

    A recently developed subgrid model for soot dynamics [H. El-Asrag, T. Lu, C.K. Law, S. Menon, Combust. Flame 150 (2007) 108-126] is used to study the soot formation in a non-premixed turbulent flame. The model allows coupling between reaction, diffusion and soot (including soot diffusion and thermophoretic forces) processes in the subgrid domain without requiring ad hoc filtering or model parameter adjustments. The combined model includes the entire process, from the initial phase, when the soot nucleus diameter is much smaller than the mean free path, to the final phase, after coagulation and aggregation, where it can be considered in the continuum regime. A relatively detailed but reduced kinetics for ethylene-air is used to simulate an experimentally studied non-premixed ethylene/air jet diffusion flame. Acetylene is used as a soot precursor species. The soot volume fraction order of magnitude, the location of its maxima, and the soot particle size distribution are all captured reasonably. Along the centerline, an initial region dominated by nucleation and surface growth is established followed by an oxidation region. The diffusion effect is found to be most important in the nucleation regime, while the thermophoretic forces become more influential downstream of the potential core in the oxidation zone. The particle size distribution shows a log-normal distribution in the nucleation region, and a more Gaussian like distribution further downstream. Limitations of the current approach and possible solution strategies are also discussed. (author)

  11. A framework for the evaluation of turbulence closures used in mesoscale ocean large-eddy simulations

    E-Print Network [OSTI]

    Graham, Jonathan Pietarila

    2012-01-01T23:59:59.000Z

    We present a methodology to determine the best turbulence closure for an eddy-permitting ocean model: measurement of the error-landscape of the closure's subgrid spectral transfers and flux. Using a high-resolution benchmark, we compare each closure's model of energy and enstrophy transfer to the actual transfer observed in the benchmark run. The error-landscape norms enable us to both make objective comparisons between the closures and to optimize each closure's free parameter for a fair comparison. We apply this method to 6 different closures for forced-dissipative simulations of the barotropic vorticity equation on a f-plane (2D Navier-Stokes equation). The hyper-viscous closure most closely reproduces the enstrophy cascade especially at larger scales due to the concentration of its dissipative effects to the very smallest scales. The viscous and Leith closures perform nearly as well especially at smaller scales where all three models were dissipative. The Smagorinsky closure dissipates enstrophy at the wr...

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

    SciTech Connect (OSTI)

    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

    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.

  13. Using Mesoscale Weather Model Output as Boundary Conditions for Atmospheric Large-Eddy Simulations and Wind-Plant Aerodynamic Simulations (Presentation)

    SciTech Connect (OSTI)

    Churchfield, M. J.; Michalakes, J.; Vanderwende, B.; Lee, S.; Sprague, M. A.; Lundquist, J. K.; Moriarty, P. J.

    2013-10-01T23:59:59.000Z

    Wind plant aerodynamics are directly affected by the microscale weather, which is directly influenced by the mesoscale weather. Microscale weather refers to processes that occur within the atmospheric boundary layer with the largest scales being a few hundred meters to a few kilometers depending on the atmospheric stability of the boundary layer. Mesoscale weather refers to large weather patterns, such as weather fronts, with the largest scales being hundreds of kilometers wide. Sometimes microscale simulations that capture mesoscale-driven variations (changes in wind speed and direction over time or across the spatial extent of a wind plant) are important in wind plant analysis. In this paper, we present our preliminary work in coupling a mesoscale weather model with a microscale atmospheric large-eddy simulation model. The coupling is one-way beginning with the weather model and ending with a computational fluid dynamics solver using the weather model in coarse large-eddy simulation mode as an intermediary. We simulate one hour of daytime moderately convective microscale development driven by the mesoscale data, which are applied as initial and boundary conditions to the microscale domain, at a site in Iowa. We analyze the time and distance necessary for the smallest resolvable microscales to develop.

  14. Comparison of the Dynamic Wake Meandering Model, Large-Eddy Simulation, and Field Data at the Egmond aan Zee Offshore Wind Plant: Preprint

    SciTech Connect (OSTI)

    Churchfield, M. J.; Moriarty, P. J.; Hao, Y.; Lackner, M. A.; Barthelmie, R.; Lundquist, J.; Oxley, G. S.

    2014-12-01T23:59:59.000Z

    The focus of this work is the comparison of the dynamic wake meandering model and large-eddy simulation with field data from the Egmond aan Zee offshore wind plant composed of 36 3-MW turbines. The field data includes meteorological mast measurements, SCADA information from all turbines, and strain-gauge data from two turbines. The dynamic wake meandering model and large-eddy simulation are means of computing unsteady wind plant aerodynamics, including the important unsteady meandering of wakes as they convect downstream and interact with other turbines and wakes. Both of these models are coupled to a turbine model such that power and mechanical loads of each turbine in the wind plant are computed. We are interested in how accurately different types of waking (e.g., direct versus partial waking), can be modeled, and how background turbulence level affects these loads. We show that both the dynamic wake meandering model and large-eddy simulation appear to underpredict power and overpredict fatigue loads because of wake effects, but it is unclear that they are really in error. This discrepancy may be caused by wind-direction uncertainty in the field data, which tends to make wake effects appear less pronounced.

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

    E-Print Network [OSTI]

    Mirocha, Jeffrey D.; Kosovi?, Branko

    2010-01-01T23:59:59.000Z

    Mean pro?les of potential temperature, wind speed, verticalsection. 4.1 Potential Temperature and Wind Speed Pro?lesequilibrium LES potential temperature and wind speed pro?les

  16. Implementation and assessment of turbine wake models in the Weather Research and Forecasting model for both mesoscale and large-eddy simulation

    SciTech Connect (OSTI)

    Singer, M; Mirocha, J; Lundquist, J; Cleve, J

    2010-03-03T23:59:59.000Z

    Flow dynamics in large wind projects are influenced by the turbines located within. The turbine wakes, regions characterized by lower wind speeds and higher levels of turbulence than the surrounding free stream flow, can extend several rotor diameters downstream, and may meander and widen with increasing distance from the turbine. Turbine wakes can also reduce the power generated by downstream turbines and accelerate fatigue and damage to turbine components. An improved understanding of wake formation and transport within wind parks is essential for maximizing power output and increasing turbine lifespan. Moreover, the influence of wakes from large wind projects on neighboring wind farms, agricultural activities, and local climate are all areas of concern that can likewise be addressed by wake modeling. This work describes the formulation and application of an actuator disk model for studying flow dynamics of both individual turbines and arrays of turbines within wind projects. The actuator disk model is implemented in the Weather Research and Forecasting (WRF) model, which is an open-source atmospheric simulation code applicable to a wide range of scales, from mesoscale to large-eddy simulation. Preliminary results demonstrate the applicability of the actuator disk model within WRF to a moderately high-resolution large-eddy simulation study of a small array of turbines.

  17. Sandia Energy - Simulating Turbine-Turbine Interaction

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    of wind-turbine wakes within a turbulent atmospheric boundary layer using a large eddy simulation (LES) method. Current and ongoing work aims to leverage the simulation...

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

    E-Print Network [OSTI]

    Raman, Venkat

    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

  19. Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    10 DOE Vehicle Technologies and Hydrogen Programs Annual Merit Review and Peer Evaluation Meeting, June 7-11, 2010 -- Washington D.C. ace007oefelein2010o.pdf More Documents &...

  20. Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't YourTransport(FactDepartment ofLetter Report:40PM toLEDControl Concept

  1. Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't YourTransport(FactDepartment ofLetter Report:40PM toLEDControl ConceptCombustion Research |

  2. Large Eddy Simulation (LES) Applied to Low-Temperature and Diesel Engine

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't YourTransport(FactDepartment ofLetter Report:40PM toLEDControl ConceptCombustion Research

  3. 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 School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, USA b Combustion PDFs of compositions. Ó 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved

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

    E-Print Network [OSTI]

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

    2014-06-25T23:59:59.000Z

    of around 100,000 polyhedral cells and is refined in the fuel jet and flame regions, thereby leading to 100-200 LES cells within one CMC cell there. This CMC mesh refinement is expected to be useful here because fine local CMC resolution can better... . In CMC, h=0 corresponds to air and h=1 to pure fuel, both at 298 K. The fully burning steady solutions with 10 50 sN ?? from a 0D-CMC calculation are used to initialize all the CMC cells. Inert mixing solutions are injected in the air and fuel inlets...

  5. 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 larger, but the power production of these large plants has, in some cases, been lower than initially

  6. Coupled Mesoscale-Large-Eddy Modeling of Realistic Stable Boundary Layer Turbulence

    E-Print Network [OSTI]

    Wang, Yao; Manuel, Lance

    2013-01-01T23:59:59.000Z

    Site-specific flow and turbulence information are needed for various practical applications, ranging from aerodynamic/aeroelastic modeling for wind turbine design to optical diffraction calculations. Even though highly desirable, collecting on-site meteorological measurements can be an expensive, time-consuming, and sometimes a challenging task. In this work, we propose a coupled mesoscale-large-eddy modeling framework to synthetically generate site-specific flow and turbulence data. The workhorses behind our framework are a state-of-the-art, open-source atmospheric model called the Weather Research and Forecasting (WRF) model and a tuning-free large-eddy simulation (LES) model. Using this coupled framework, we simulate a nighttime stable boundary layer (SBL) case from the well-known CASES-99 field campaign. One of the unique aspects of this work is the usage of a diverse range of observations for characterization and validation. The coupled models reproduce certain characteristics of observed low-level jets....

  7. An isogeometric variational multiscale method for large-eddy simulation of coupled multi-ion transport in turbulent flow

    SciTech Connect (OSTI)

    Bauer, Georg; Gamnitzer, Peter [Institute for Computational Mechanics, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany)] [Institute for Computational Mechanics, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany); Gravemeier, Volker, E-mail: vgravem@lnm.mw.tum.de [Institute for Computational Mechanics, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany) [Institute for Computational Mechanics, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany); Emmy Noether Research Group “Computational Multiscale Methods for Turbulent Combustion”, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany); Wall, Wolfgang A. [Institute for Computational Mechanics, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany)] [Institute for Computational Mechanics, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany)

    2013-10-15T23:59:59.000Z

    Highlights: •We present a computational method for coupled multi-ion transport in turbulent flow. •The underlying formulation is a variational multiscale finite element method. •It is combined with the isogeometric concept for electrochemical systems. •Coupled multi-ion transport in fully turbulent Taylor–Couette flow is simulated. •This example is an important model problem for rotating cylinder electrodes. -- Abstract: Electrochemical processes, such as electroplating of large items in galvanic baths, are often coupled to turbulent flow. In this study, we propose an isogeometric residual-based variational multiscale finite element method for multi-ion transport in dilute electrolyte solutions under turbulent flow conditions. In other words, this means that the concepts of isogeometric discretization and variational multiscale methods are successfully combined for developing a method capable of simulating the challenging problem of coupled multi-ion transport in turbulent flow. We present a comprehensive three-dimensional computational method taking into account, among others, coupled convection–diffusion-migration equations subject to an electroneutrality constraint in combination with phenomenological electrode-kinetics modeling. The electrochemical subproblem is one-way coupled to turbulent incompressible flow via convection. Ionic mass transfer in turbulent Taylor–Couette flow is investigated, representing an important model problem for rotating-cylinder-electrode configurations. Multi-ion transport as considered here is an example for mass transport at high Schmidt number (Sc=1389). An isogeometric discretization is especially advantageous for the present problem, since (i) curved boundaries can be represented exactly, and (ii) it has been proven to provide very accurate solutions for flow quantities when being applied in combination with residual-based variational multiscale modeling. We demonstrate that the method is robust and provides results which are in good agreement with direct numerical simulation results as well as empirical mass-transfer correlations reported in literature.

  8. 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]

    Denmark and Sweden and compared results with more than a year's worth of plant data.The simulated power 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

  9. 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]

    Nicoud, Franck

    turbine blades conditions the temperature and pres- sure levels reached in the combustor, and therefore the engine effi- ciency. Numerical simulations of the thermal interaction between fluid flows and solids to efficiently converge to steady thermal states. There are two basic approaches to solve Conjugate Heat Trans

  10. Large eddy simulation of turbulence within heat exchangers

    E-Print Network [OSTI]

    Pruitt, John Myron

    1992-01-01T23:59:59.000Z

    by the Electric Power Research Institute (EPRI), and continued within the Nuclear Engineering Department of Texas A&M University. Previous investigation has predicted the turbulent characteristics within the waterbox region of the Westinghouse D-4 steam... generator. Further investigation has included single and multiple tube configurations using coarse meshes. EPRI has supported this effort with many experimental investigations designed to provide data for comparison and validation of the technique...

  11. Large Eddy Simulations of Jet Flow Interactions Within Rod Bundles

    E-Print Network [OSTI]

    Salpeter, Nathaniel O.

    2010-07-14T23:59:59.000Z

    5,603,819 4 2.00mm 4,439,612 5 3.00mm 4,237,281 19 a) 0.65mm Cell Size b) 0.75mm Cell Size b) 0.9mm Cell Size c) 1.2mm Cell Size d) 2mm Cell Size e) 3mm Cell Size... ................................................................................................. 16 2.3. Grid Sensitivity Study Results and Discussion .............................................. 23 2.4. Analysis Methods ........................................................................................... 31 3. RESULTS...

  12. Study of natural ventilation in buildings with large eddy simulation

    E-Print Network [OSTI]

    Jiang, Yi, 1972-

    2002-01-01T23:59:59.000Z

    With the discovery of many economic, environmental, and health problems in sealed and mechanically ventilated buildings, the concept of natural ventilation has been revived. "Buildings that breathe" have become more and ...

  13. LARGE EDDY SIMULATION OF NATURAL AND MIXED CONVECTION AIRFLOW INDOORS

    E-Print Network [OSTI]

    Chen, Qingyan "Yan"

    coordinate Greek symbols : Thermal expansion coefficient t : Time step : Filter size : Kinematic viscocity convection, such as winter heating by a baseboard heater; forced convection, such as free cooling in shoulder

  14. Large Eddy Simulations of Combustor Liner Flows | Argonne Leadership

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5 - -/e),,sand CERNLand andComputing Facility

  15. Dynamic procedure for filtered gyrokinetic simulations

    SciTech Connect (OSTI)

    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

    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.

  16. Numerical simulation of flow distribution for pebble bed high temperature gas cooled reactors

    E-Print Network [OSTI]

    Yesilyurt, Gokhan

    2004-09-30T23:59:59.000Z

    ?....................................................................................26 V CFD MODELLING ...................................................................................28 V.1 Computational Fluid Dynamics (CFD) ..........................................28 V.2 The History.... Hassan The premise of the work presented here is to use a common analytical tool, Computational Fluid Dynamics (CFD), along with different turbulence models. Eddy viscosity models as well as state-of-the-art Large Eddy Simulation (LES) were...

  17. On integrating LES and laboratory turbulent flow experiments

    SciTech Connect (OSTI)

    Grinstein, Fernando Franklin [Los Alamos National Laboratory

    2008-01-01T23:59:59.000Z

    Critical issues involved in large eddy simulation (LES) experiments relate to the treatment of unresolved subgrid scale flow features and required initial and boundary condition supergrid scale modelling. The inherently intrusive nature of both LES and laboratory experiments is noted in this context. Flow characterization issues becomes very challenging ones in validation and computational laboratory studies, where potential sources of discrepancies between predictions and measurements need to be clearly evaluated and controlled. A special focus of the discussion is devoted to turbulent initial condition issues.

  18. Simulating flame lift-off characteristics of diesel and biodiesel fuels using detailed chemical-kinetic mechanisms and LES turbulence model.

    SciTech Connect (OSTI)

    Som, S; Longman, D. E.; Luo, Z; Plomer, M; Lu, T; Senecal, P.K.; Pomraning, E (Energy Systems); (Univ. of Connecticut); (CONVERGENT Science)

    2012-01-01T23:59:59.000Z

    Combustion in direct-injection diesel engines occurs in a lifted, turbulent diffusion flame mode. Numerous studies indicate that the combustion and emissions in such engines are strongly influenced by the lifted flame characteristics, which are in turn determined by fuel and air mixing in the upstream region of the lifted flame, and consequently by the liquid breakup and spray development processes. From a numerical standpoint, these spray combustion processes depend heavily on the choice of underlying spray, combustion, and turbulence models. The present numerical study investigates the influence of different chemical kinetic mechanisms for diesel and biodiesel fuels, as well as Reynolds-averaged Navier-Stokes (RANS) and large eddy simulation (LES) turbulence models on predicting flame lift-off lengths (LOLs) and ignition delays. Specifically, two chemical kinetic mechanisms for n-heptane (NHPT) and three for biodiesel surrogates are investigated. In addition, the RNG k-{epsilon} (RANS) model is compared to the Smagorinsky based LES turbulence model. Using adaptive grid resolution, minimum grid sizes of 250 {micro}m and 125 {micro}m were obtained for the RANS and LES cases respectively. Validations of these models were performed against experimental data from Sandia National Laboratories in a constant volume combustion chamber. Ignition delay and flame lift-off validations were performed at different ambient temperature conditions. The LES model predicts lower ignition delays and qualitatively better flame structures compared to the RNG k-{epsilon} model. The use of realistic chemistry and a ternary surrogate mixture, which consists of methyl decanoate, methyl 9-decenoate, and NHPT, results in better predicted LOLs and ignition delays. For diesel fuel though, only marginal improvements are observed by using larger size mechanisms. However, these improved predictions come at a significant increase in computational cost.

  19. Adaptive LES Methodology for Turbulent Flow Simulations

    SciTech Connect (OSTI)

    Oleg V. Vasilyev

    2008-06-12T23:59:59.000Z

    Although turbulent flows are common in the world around us, a solution to the fundamental equations that govern turbulence still eludes the scientific community. Turbulence has often been called one of the last unsolved problem in classical physics, yet it is clear that the need to accurately predict the effect of turbulent flows impacts virtually every field of science and engineering. As an example, a critical step in making modern computational tools useful in designing aircraft is to be able to accurately predict the lift, drag, and other aerodynamic characteristics in numerical simulations in a reasonable amount of time. Simulations that take months to years to complete are much less useful to the design cycle. Much work has been done toward this goal (Lee-Rausch et al. 2003, Jameson 2003) and as cost effective accurate tools for simulating turbulent flows evolve, we will all benefit from new scientific and engineering breakthroughs. The problem of simulating high Reynolds number (Re) turbulent flows of engineering and scientific interest would have been solved with the advent of Direct Numerical Simulation (DNS) techniques if unlimited computing power, memory, and time could be applied to each particular problem. Yet, given the current and near future computational resources that exist and a reasonable limit on the amount of time an engineer or scientist can wait for a result, the DNS technique will not be useful for more than 'unit' problems for the foreseeable future (Moin & Kim 1997, Jimenez & Moin 1991). The high computational cost for the DNS of three dimensional turbulent flows results from the fact that they have eddies of significant energy in a range of scales from the characteristic length scale of the flow all the way down to the Kolmogorov length scale. The actual cost of doing a three dimensional DNS scales as Re{sup 9/4} due to the large disparity in scales that need to be fully resolved. State-of-the-art DNS calculations of isotropic turbulence have recently been completed at the Japanese Earth Simulator (Yokokawa et al. 2002, Kaneda et al. 2003) using a resolution of 40963 (approximately 10{sup 11}) grid points with a Taylor-scale Reynolds number of 1217 (Re {approx} 10{sup 6}). Impressive as these calculations are, performed on one of the world's fastest super computers, more brute computational power would be needed to simulate the flow over the fuselage of a commercial aircraft at cruising speed. Such a calculation would require on the order of 10{sup 16} grid points and would have a Reynolds number in the range of 108. Such a calculation would take several thousand years to simulate one minute of flight time on today's fastest super computers (Moin & Kim 1997). Even using state-of-the-art zonal approaches, which allow DNS calculations that resolve the necessary range of scales within predefined 'zones' in the flow domain, this calculation would take far too long for the result to be of engineering interest when it is finally obtained. Since computing power, memory, and time are all scarce resources, the problem of simulating turbulent flows has become one of how to abstract or simplify the complexity of the physics represented in the full Navier-Stokes (NS) equations in such a way that the 'important' physics of the problem is captured at a lower cost. To do this, a portion of the modes of the turbulent flow field needs to be approximated by a low order model that is cheaper than the full NS calculation. This model can then be used along with a numerical simulation of the 'important' modes of the problem that cannot be well represented by the model. The decision of what part of the physics to model and what kind of model to use has to be based on what physical properties are considered 'important' for the problem. It should be noted that 'nothing is free', so any use of a low order model will by definition lose some information about the original flow.

  20. Anomalous Scaling of Structure Functions and Dynamic Constraints on Turbulence Simulations

    E-Print Network [OSTI]

    Victor Yakhot; Katepalli R. Sreenivasan

    2005-06-20T23:59:59.000Z

    The connection between anomalous scaling of structure functions (intermittency) and numerical methods for turbulence simulations is discussed. It is argued that the computational work for direct numerical simulations (DNS) of fully developed turbulence increases as $Re^{4}$, and not as $Re^{3}$ expected from Kolmogorov's theory, where $Re$ is a large-scale Reynolds number. Various relations for the moments of acceleration and velocity derivatives are derived. An infinite set of exact constraints on dynamically consistent subgrid models for Large Eddy Simulations (LES) is derived from the Navier-Stokes equations, and some problems of principle associated with existing LES models are highlighted.

  1. Three dimensional simulations of Richtmyer-Meshkov instabilities in shock-tube experiments

    SciTech Connect (OSTI)

    Gowardhan, Akshay A [Los Alamos National Laboratory; Grinstein, Fernando F [Los Alamos National Laboratory; Wachtor, Adam J [Los Alamos National Laboratory

    2010-01-01T23:59:59.000Z

    In the large eddy simulation (LES) approach large-scale energy-containing structures are resolved, smaller (presumably) more isotropic structures are filtered out, and unresolved subgrid effects are modeled. Extensive recent work has demonstrated that predictive simulations of turbulent velocity fields are possible based on subgrid scale modeling implicitly provided by a class of high-resolution finite-volume algorithms. This strategy is called implicit LES. The extension of the approach to the substantially more difficult problem of material mixing IS addressed, and progress in representative shock-driven turbulent mixing studies is reported.

  2. Immersed Boundary Methods for High-Resolution Simulation of Atmospheric Boundary-Layer Flow Over Complex Terrain

    E-Print Network [OSTI]

    Lundquist, Katherine Ann

    2010-01-01T23:59:59.000Z

    large-eddy simulations within mesoscale simulations for windEddy Simulation of a Mesoscale Convective Internal Boundary185, 1957. Pielke, R. , Mesoscale Meteorological Modeling,

  3. Prediction of Small-Scale Cavitation in a High Speed Flow Over an Open Cavity Using Large Eddy

    E-Print Network [OSTI]

    Apte, Sourabh V.

    Prediction of Small-Scale Cavitation in a High Speed Flow Over an Open Cavity Using Large Eddy- gether with the cavitation models predict that inception occurs near the trailing edge similar in cavitation. 1 INTRODUCTION The problem of cavitation has been widely studied owing to its influence

  4. advanced analytical simulation: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    in Drizzling Stratiform Clouds Based on Large-Eddy Simulations University of Kansas - KU ScholarWorks Summary: Cloud microphysical parameterizations and retrievals...

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

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    proposals for carbon capture and sequestration also involve supersonic flows in the compressors. This project will focus on the upper surface of a transport aircraft wing,...

  6. Large Eddy Simulation of laser ignition and compressible reacting flow in a rocket-like

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    combustion devices. The technical needs for internal-combustion (IC) engines and aircraft combustors have in a rocket engine is a critical problem for combustion cham- ber design. Delayed ignition may lead to high without failure. The combustion initiation in rocket engines is usually based on pyrotechnic devices

  7. Large eddy simulation of supersonic combustion with application to scramjet engines

    E-Print Network [OSTI]

    Cocks, Peter

    2011-07-12T23:59:59.000Z

    .4.1 Desirable Properties . . . . . . . . . . . . . . . . . . . . . 64 4.4.1.1 Monotonicity . . . . . . . . . . . . . . . . . . . . 65 4.4.1.2 High Order of Accuracy . . . . . . . . . . . . . . 65 4.4.2 Discretisation Techniques... [105] (a) Detail of noz- zle and combustor (b) Detail of combustor entrance and injector geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185 7.2 Hydrogen mass fraction distribution on the combustor centreline . 185 7.3 Planes...

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

    E-Print Network [OSTI]

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

    2015-01-01T23:59:59.000Z

    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... of environmental impact of CO2, carbon capture and sequestration (CCS) is expected as a key technology, and it is believed that oxy-fuel pulverized coal combus- tion, in which gas mixture of oxygen (O2) and CO2 are used instead of air as oxidizer, has advantages...

  9. Large-Eddy Simulations of a Drizzling, Stratocumulus-Topped Marine Boundary

    E-Print Network [OSTI]

    Stevens, Bjorn

    and Technology Yokahama, Japan Markus D. Petters Department of Atmospheric Science Colorado State University, Colorado Kozo Nakamura Frontier Research Center for Global Change Japan Agency for Marine-Earth Science on the global heat budget (Klein and Hartmann 1993). Evidence suggests they constitute a leading

  10. 2014 American Geophysical Union. All rights reserved. Observations and Numerical Simulations of Large Eddy Circulation

    E-Print Network [OSTI]

    Pierce, Stephen

    Oceanographic Institution, Woods Hole, MA, USA. 4 Naval Air Systems Command, Patuxent River, MD, USA

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

    E-Print Network [OSTI]

    Raman, Venkat

    in a dual-mode scramjet engine that provides stable compressed flow to the combustor. However function in weighted essentially nonoscillatory scheme cp = heat capacity at constant pressure e = nonchemical, sensible energy, m2 =s2 et = nonchemical total energy, m2 =s2 F = flux G = filtering kernel h

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

    E-Print Network [OSTI]

    Raman, Venkat

    The University of Texas at Austin, Austin, Tx, 78712 The isolator is an important flow section in a dual in hyperviscosity model cp = heat capacity at constant pressure cj = weighting function in WENO scheme e = non-chemical, sensible energy, m2 /s2 et = non-chemical total energy, m2 /s2 F = flux h = isolator height IP

  13. Large-eddy simulation of lean hydrogenemethane turbulent premixed flames in the methane-

    E-Print Network [OSTI]

    Gülder, �mer L.

    -based to hydrogen-based economy are still under discussion and the implementation of the hydrogen- based economy methane flame in the methane- dominated regime. Copyright ª 2014, Hydrogen Energy Publications, LLC appear to be a promising option to synergistically pave the way toward pure hydrogen- based combustion

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

    E-Print Network [OSTI]

    Barsamian, Hagop Raffi

    1994-01-01T23:59:59.000Z

    and not the cause of the instability (France and Hopkins, 1994). This process has been studied by Song and Yuan (1990) for both primary and secondary vortices with relative success, as well as Polak and Weaver (1994) in triangular tube arrays. The forces...

  15. ON THE EULERIAN LARGE EDDY SIMULATION OF DISPERSE PHASE FLOWS: AN ASYMPTOTIC PRESERVING SCHEME FOR

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    . These constraints are: 1/as the resulting sound speed is inversely proportional to the Stokes number, it is highly on the accurate description of both the continuous carrier phase, gaseous or liquid, and the discrete particulate

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

    E-Print Network [OSTI]

    Rabau, Joshua I

    2013-05-01T23:59:59.000Z

    Wall-bounded turbulent flows are prevalent in engineering and industrial applications. Walls greatly affect turbulent characteristics in many ways including production and propagation of turbulent stresses. While computational fluid dynamics can...

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

    E-Print Network [OSTI]

    Kewlani, Gaurav

    2014-01-01T23:59:59.000Z

    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 ...

  18. LARGE EDDY SIMULATION FOR TURBULENT MHD FLOWS A. LABOVSKY AND C. TRENCHEA

    E-Print Network [OSTI]

    Trenchea, Catalin

    problems such as plasma confinement, controlled thermonuclear fusion, liquid-metal cooling of nuclear

  19. Numerical errors in the computation of subfilter scalar variance in large eddy simulations

    E-Print Network [OSTI]

    Raman, Venkat

    Mechanics, The University of Texas at Austin, Austin, Texas 78712, USA 2 Center for Turbulence Research of specific model forms. Like other subfilter quantities, such as kinetic energy, subfilter variance can-rule manipulations used to derive convection, diffusion, and production terms associated with the square

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

    E-Print Network [OSTI]

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

    2015-01-01T23:59:59.000Z

    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...

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

    E-Print Network [OSTI]

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

    2009-08-01T23:59:59.000Z

    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 ...

  2. Large-eddy Simulation of the Nighttime Stable Atmospheric Boundary Layer

    E-Print Network [OSTI]

    Zhou, Bowen

    2012-01-01T23:59:59.000Z

    coordinate and (b) wind and potential temperature at the up-coordinate and (b) wind and potential temperature at the up-Mean profiles of wind and potential temperature, turbulent

  3. Large Eddy Simulation of PBL Stratocumulus: Comparison of Multi-Dimensional and IPA Longwave Radiative Forcing

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5 - -/e),,sand CERNLand and

  4. Large-Eddy Simulation for Green Energy and Propulsion Systems | Argonne

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5 - -/e),,sand CERNLandLargefor High

  5. NREL Develops Simulations for Wind Plant Power and Turbine Loads (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2012-04-01T23:59:59.000Z

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

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

    SciTech Connect (OSTI)

    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

    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)

  7. Diagnosis of Differences Between Stratiform Clouds Simulated by Large-Eddy Simulation and Single-Column Models

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville Power AdministrationField Campaign: Potential ApplicationYu, James Cowin PNNLDeviceDiagnosis

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

    SciTech Connect (OSTI)

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

    2010-02-22T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

    Steven Cannon; Clifford Smith

    2003-04-01T23:59:59.000Z

    Application and testing of the new combustion Large Eddy Simulation (LES) code for the design of advanced gaseous combustion systems is described in this 10th quarterly report. CFD Research Corporation has developed the LES module within the parallel, unstructured solver included in the commercial CFD-ACE+ software. In this quarter, validation and testing of the combustion LES code was performed for the DOE-Simval combustor. Also, Beta testing by consortium members was performed for various burner and combustor configurations. In the two quarters ahead, CFDRC will validate the code on the new DOE SimVal experiments. Experimental data from DOE should be available in June 2003, though LES calculations are currently being performed. This will ensure a truly predictive test of the software. CFDRC will also provide help to the consortium members on running their cases, and incorporate improvements to the software suggested by the beta testers. The beta testers will compare their predictions with experimental measurements and other numerical calculations. At the end of this project (October, 2003), a final released version of the software will be available for licensing to the general public.

  10. A Study of Strain Rate Effects for Turbulent Premixed Flames with Application to LES of a Gas Turbine Combustor Model

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Kemenov, Konstantin A.; Calhoon, William H.

    2015-03-24T23:59:59.000Z

    Large-scale strain rate field, a resolved quantity which is easily computable in large-eddy simulations (LES), could have profound effects on the premixed flame properties by altering the turbulent flame speed and inducing local extinction. The role of the resolved strain rate has been investigated in a posterior LES study of GE lean premixed dry low NOx emissions LM6000 gas turbine combustor model. A novel approach which is based on the coupling of the lineareddy model with a one-dimensional counter-flow solver has been applied to obtain the parameterizations of the resolved premixed flame properties in terms of the reactive progress variable, the local strain rate measure, and local Reynolds and Karlovitz numbers. The strain rate effects have been analyzed by comparing LES statistics for several models of the turbulent flame speed, i.e, with and without accounting for the local strain rate effects, with available experimental data. The sensitivity of the simulation results to the inflow velocity conditions as well as the grid resolution have been also studied. Overall, the results suggest the necessity to represent the strain rate effects accurately in order to improve LES modeling of the turbulent flame speed.

  11. A Study of Strain Rate Effects for Turbulent Premixed Flames with Application to LES of a Gas Turbine Combustor Model

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Kemenov, Konstantin A.; Calhoon, William H.

    2015-03-24T23:59:59.000Z

    Large-scale strain rate field, a resolved quantity which is easily computable in large-eddy simulations (LES), could have profound effects on the premixed flame properties by altering the turbulent flame speed and inducing local extinction. The role of the resolved strain rate has been investigated in a posterior LES study of GE lean premixed dry low NOx emissions LM6000 gas turbine combustor model. A novel approach which is based on the coupling of the lineareddy model with a one-dimensional counter-flow solver has been applied to obtain the parameterizations of the resolved premixed flame properties in terms of the reactive progress variable,more »the local strain rate measure, and local Reynolds and Karlovitz numbers. The strain rate effects have been analyzed by comparing LES statistics for several models of the turbulent flame speed, i.e, with and without accounting for the local strain rate effects, with available experimental data. The sensitivity of the simulation results to the inflow velocity conditions as well as the grid resolution have been also studied. Overall, the results suggest the necessity to represent the strain rate effects accurately in order to improve LES modeling of the turbulent flame speed.« less

  12. LES of an Inclined Jet into a Supersonic Turbulent Crossflow

    E-Print Network [OSTI]

    Ferrante, Antonino; Dimotakis, Paul E; Stephens, Mike; Adams, Paul; Walters, Richard

    2009-01-01T23:59:59.000Z

    This short article describes flow parameters, numerical method, and animations of the fluid dynamics video "LES of an Inclined Jet into a Supersonic Turbulent Crossflow" (http://ecommons.library.cornell.edu/bitstream/1813/14073/3/GFM-2009.mpg [high-resolution] and http://ecommons.library.cornell.edu/bitstream/1813/14073/2/GFM-2009-web.m1v [low-resolution] video). We performed large-eddy simulation with the sub-grid scale (LES-SGS) stretched-vortex model of momentum and scalar transport to study the gas-dynamics interactions of a helium inclined round jet into a supersonic ($M=3.6$) turbulent (\\Reth$ =13\\times10^3$) air flow over a flat surface. The video shows the temporal development of Mach-number and magnitude of density-gradient in the mid-span plane, and isosurface of helium mass-fraction and $\\lam_2$ (vortical structures). The identified vortical structures are sheets, tilted tubes, and discontinuous rings. The vortical structures are shown to be well correlated in space and time with helium mass-fracti...

  13. 0.5setgray00.5setgray1 Volumes finis pour les fluides

    E-Print Network [OSTI]

    Herbin, Raphaèle

    pollution par les hydrocarbures, les nitrates, les radionucléides... MFN 2005, Roscoff ­ p. #12;Domaines d pollution par les hydrocarbures, les nitrates, les radionucléides... Ingénierie pétrolière: Simulation des, centrales nucléaires, hydraulique... Hydrologie: Ressources en eau pollution par les hydrocarbures, les

  14. Controls on precipitation and cloudiness in simulations of trade-wind cumulus as observed during RICO

    E-Print Network [OSTI]

    van Zanten, Margreet C; Stevens, Bjorn; Nuijens, Louise; Siebesma, A Pier; Ackerman, A. S.; Burnet, F.; Cheng, A.; Couvreux, F.; Jiang, H.; Khairoutdinov, M.; Kogan, Yefim L.; Lewellen, D. C.; Mechem, David B.

    2011-06-28T23:59:59.000Z

    Twelve large-eddy simulations, with a wide range of microphysical representations, are compared to each other and to independent measurements. The measurements and the initial and forcing data for the simulations are taken ...

  15. Effects of Sea-Salt Aerosols on Precipitation in Simulations of Shallow Cumulus

    E-Print Network [OSTI]

    Kogan, Yefim L.; Mechem, David B.; Choi, Kityan

    2012-02-01T23:59:59.000Z

    A suite of large-eddy simulations with size-resolving microphysical processes was performed in order to assess effects of sea-salt aerosols on precipitation process in trade cumulus. Simulations based on observations from ...

  16. Large-eddy simulation of urban dispersion during the Urban 2000 Field Program IOP-10, 25-26 October 2000

    SciTech Connect (OSTI)

    DeCroix, D. S. (David S.)

    2002-01-01T23:59:59.000Z

    In October 2000, the US Department of Energy, along with NOAA and several other government labs and universities, conducted the Vertical Transport and Mixing Experiment (VTMX) and URBAN2000 field programs in Salt Lake City, Utah (Alwine et al., 2002). The VTMX program focused on the basin-scale flow regime, where the URBAN2000 component focused on transport and dispersion in the downtown Salt Lake City area. In this paper, we will focus on a specific Intensive Operations Period, IOP-10, which occurred on October 25-26, 2000. IOP-16 was chosen because the winds in the downtown area were fairly weak and variable early in the experiment, and became more windy in the later part of the IOP. The local conditions were influenced by a shortwave ridge, and were cloudy, with a weak and very shallow surface inversion, and light mean southerly flow over the area. An inert tracer gas, SF6, was released downtown Salt Lake City for a duration of one hour at three separate times on 26 October 2000, 01:00-02:00, 03:00-04:00, and 05:00-06:00 MDT. This paper will focus on the first release time, from 01:00-02:00 MDT.

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

    E-Print Network [OSTI]

    Mirocha, Jeffrey D.; Kosovi?, Branko

    2010-01-01T23:59:59.000Z

    to the surface of the snow/ice pack is often prevented byheat ?ux from the snow/ice pack interior, which constrainsover the Arctic Ocean snow/ice pack during clear-sky, winter

  18. J4.3 LARGE-EDDY SIMULATION ACROSS A GRID REFINEMENT INTERFACE USING EXPLICIT FILTERING AND RECONSTRUCTION

    E-Print Network [OSTI]

    Chow, Fotini Katopodes

    reflect off grid refinement interfaces, specifically on the outflow boundary from a fine to a coarse grid reflection off grid refinement interfaces by forcing the filter-resolved scale on a fine grid to equal

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

    SciTech Connect (OSTI)

    Oberai, Assad A [Rensselaer Polytechnic Instistute

    2013-07-16T23:59:59.000Z

    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.

  20. Large eddy simulation of atmospheric boundary layer flow in urban terrain : implications for transport of pollution and heat

    E-Print Network [OSTI]

    Sun, Long

    2011-01-01T23:59:59.000Z

    When the convection heat transfer model is well validated,models, convection heat transfer model is often over-and a convection heat transfer model with local accuracy is

  1. Large eddy simulation of atmospheric boundary layer flow in urban terrain : implications for transport of pollution and heat

    E-Print Network [OSTI]

    Sun, Long

    2011-01-01T23:59:59.000Z

    losses of a flat-plate collector, Solar Energy 35, 15–19.from outer cover of solar collectors, Renew. Energ. 10 (4)

  2. Characterizing the Separation and Reattachment of Suction Surface Boundary Layer in Low Pressure Turbine Using Massively Parallel Large Eddy Simulations

    E-Print Network [OSTI]

    Jagannathan, Shriram

    2012-02-14T23:59:59.000Z

    . The vortex shed from the bubble, convects downstream and interacts with the trailing edge vortices increasing the turbulence intensity. On the suction side, dominant hairpin structures near the transitional and turbulent flow regime are observed...

  3. IFP Energies nouvelles International Conference Rencontres Scientifiques d'IFP Energies nouvelles

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    LES4ICE 2012 - Large Eddy Simulation for Internal Combustion Engine Flows LES4ICE 2012 - La simulation engine combustion is critical to improve engine efficiency while reducing pol- lutant emissions. To study aux grandes échelles pour les écoulements dans les moteurs à combustion interne Large-Eddy Simulation

  4. New Aerodynamics Simulations Provide Better Understanding of Wind Plant Underperformance and Loading (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2011-02-01T23:59:59.000Z

    Researchers at the National Renewable Energy Laboratory (NREL) develop a high-fidelity large-eddy simulation model designed to predict the performance of large wind plants with a higher degree of accuracy than current models.

  5. Multiscale eddy simulation for moist atmospheric convection: Preliminary investigation

    SciTech Connect (OSTI)

    Stechmann, Samuel N., E-mail: stechmann@wisc.edu [Department of Mathematics, University of Wisconsin-Madison (United States); Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison (United States)

    2014-08-15T23:59:59.000Z

    A multiscale computational framework is designed for simulating atmospheric convection and clouds. In this multiscale framework, large eddy simulation (LES) is used to model the coarse scales of 100 m and larger, and a stochastic, one-dimensional turbulence (ODT) model is used to represent the fine scales of 100 m and smaller. Coupled and evolving together, these two components provide a multiscale eddy simulation (MES). Through its fine-scale turbulence and moist thermodynamics, MES allows coarse grid cells to be partially cloudy and to encompass cloudy–clear air mixing on scales down to 1 m; in contrast, in typical LES such fine-scale processes are not represented or are parameterized using bulk deterministic closures. To illustrate MES and investigate its multiscale dynamics, a shallow cumulus cloud field is simulated. The fine-scale variability is seen to take a plausible form, with partially cloudy grid cells prominent near cloud edges and cloud top. From earlier theoretical work, this mixing of cloudy and clear air is believed to have an important impact on buoyancy. However, contrary to expectations based on earlier theoretical studies, the mean statistics of the bulk cloud field are essentially the same in MES and LES; possible reasons for this are discussed, including possible limitations in the present formulation of MES. One difference between LES and MES is seen in the coarse-scale turbulent kinetic energy, which appears to grow slowly in time due to incoherent stochastic fluctuations in the buoyancy. This and other considerations suggest the need for some type of spatial and/or temporal filtering to attenuate undersampling of the stochastic fine-scale processes.

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

    SciTech Connect (OSTI)

    Clifford E. Smith; Steven M. Cannon; Virgil Adumitroaie; David L. Black; Karl V. Meredith

    2005-01-01T23:59:59.000Z

    In this project, an advanced computational software tool was developed for the design of low emission combustion systems required for Vision 21 clean energy plants. Vision 21 combustion systems, such as combustors for gas turbines, combustors for indirect fired cycles, furnaces and sequestrian-ready combustion systems, will require innovative low emission designs and low development costs if Vision 21 goals are to be realized. The simulation tool will greatly reduce the number of experimental tests; this is especially desirable for gas turbine combustor design since the cost of the high pressure testing is extremely costly. In addition, the software will stimulate new ideas, will provide the capability of assessing and adapting low-emission combustors to alternate fuels, and will greatly reduce the development time cycle of combustion systems. The revolutionary combustion simulation software is able to accurately simulate the highly transient nature of gaseous-fueled (e.g. natural gas, low BTU syngas, hydrogen, biogas etc.) turbulent combustion and assess innovative concepts needed for Vision 21 plants. In addition, the software is capable of analyzing liquid-fueled combustion systems since that capability was developed under a concurrent Air Force Small Business Innovative Research (SBIR) program. The complex physics of the reacting flow field are captured using 3D Large Eddy Simulation (LES) methods, in which large scale transient motion is resolved by time-accurate numerics, while the small scale motion is modeled using advanced subgrid turbulence and chemistry closures. In this way, LES combustion simulations can model many physical aspects that, until now, were impossible to predict with 3D steady-state Reynolds Averaged Navier-Stokes (RANS) analysis, i.e. very low NOx emissions, combustion instability (coupling of unsteady heat and acoustics), lean blowout, flashback, autoignition, etc. LES methods are becoming more and more practical by linking together tens to hundreds of PCs and performing parallel computations with fine grids (millions of cells). Such simulations, performed in a few weeks or less, provide a very cost-effective complement to experimental testing. In 5 years, these same calculations can be performed in 24 hours or less due to the expected increase of computing power and improved numerical techniques. This project was a four-year program. 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 CFD-ACE+ code. University expertise (Georgia Tech and University of California, 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 implemented into the final release (licensed) version of the combustion LES software 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 DoE SIMVAL cases, and compared predictions with measurements from NETL. In addition to comparisons with NOx and CO exit measurements, comparisons were made to measured pressure oscillations. Potential areas of improvement for combustion and turbulence models were identified. In conclusion, this program advanced the state-of-the-art in combustion LES an

  7. IFP Energies nouvelles International Conference Rencontres Scientifiques d'IFP Energies nouvelles

    E-Print Network [OSTI]

    Boyer, Edmond

    Large Eddy Simulations Applied to Non-Reactive Transient Diesel Sprays Anthony Robert, Lionel Martinez Euler ­ Euler pour la simulation aux grandes e´ chelles de sprays Diesel instationnaires non-re´ actifs (LES, Large Eddy Simulations) de sprays Diesel instationnaires dans une cellule haute pression et haute

  8. IFP Energies nouvelles International Conference Rencontres Scientifiques d'IFP Energies nouvelles

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    LES4ICE 2012 - Large Eddy Simulation for Internal Combustion Engine Flows LES4ICE 2012 - La simulation aux grandes échelles pour les écoulements dans les moteurs à combustion interne Numerical Methods and Turbulence Modeling for LES of Piston Engines: Impact on Flow Motion and Combustion A. Misdariis1,2, *, A

  9. Enabling Advanced Modeling and Simulations for Fuel-Flexible Combustors

    SciTech Connect (OSTI)

    Pitsch, Heinz

    2010-05-31T23:59:59.000Z

    The overall goal of the present project is to enable advanced modeling and simulations for the design and optimization of fuel-flexible turbine combustors. For this purpose we use a high fidelity, extensively-tested large-eddy simulation (LES) code and state-of-the-art models for premixed/partially-premixed turbulent combustion developed in the PI's group. In the frame of the present project, these techniques are applied, assessed, and improved for hydrogen enriched premixed and partially premixed gas-turbine combustion. Our innovative approaches include a completely consistent description of flame propagation; a coupled progress variable/level set method to resolve the detailed flame structure, and incorporation of thermal-diffusion (non-unity Lewis number) effects. In addition, we have developed a general flamelet-type transformation holding in the limits of both non-premixed and premixed burning. As a result, a model for partially premixed combustion has been derived. The coupled progress variable/level method and the general flamelet transformation were validated by LES of a lean-premixed low-swirl burner that has been studied experimentally at Lawrence Berkeley National Laboratory. The model is extended to include the non-unity Lewis number effects, which play a critical role in fuel-flexible combustor with high hydrogen content fuel. More specifically, a two-scalar model for lean hydrogen and hydrogen-enriched combustion is developed and validated against experimental and direct numerical simulation (DNS) data. Results are presented to emphasize the importance of non-unity Lewis number effects in the lean-premixed low-swirl burner of interest in this project. The proposed model gives improved results, which shows that the inclusion of the non-unity Lewis number effects is essential for accurate prediction of the lean-premixed low-swirl flame.

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

    SciTech Connect (OSTI)

    Sanjiva Lele

    2012-10-01T23:59:59.000Z

    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.

  11. Les tudiants Les personnels enseignants

    E-Print Network [OSTI]

    Dambrine, Marc

    institutionnels et industriels. L'UPPA est aussi un acteur majeur du développement économique local notamment au 2012/2013 les étudiants del'UPPA Effectifs Ventilation par diplôme & composante par site 54% de femmes'insertionprofessionnelle Ventilation par type de diplôme 1360 étudiants étrangers 12% Départements de résidence parentale 56% Pyrénées

  12. A localised subgrid scale model for fluid dynamical simulations in astrophysics I: Theory and numerical tests

    E-Print Network [OSTI]

    Schmidt, W; Niemeyer, J C

    2006-01-01T23:59:59.000Z

    We present a one-equation subgrid scale model that evolves the turbulence energy corresponding to unresolved velocity fluctuations in large eddy simulations. The model is derived in the context of the Germano consistent decomposition of the hydrodynamical equations. The eddy-viscosity closure for the rate of energy transfer from resolved toward subgrid scales is localised by means of a dynamical procedure for the computation of the closure parameter. Therefore, the subgrid scale model applies to arbitrary flow geometry and evolution. For the treatment of microscopic viscous dissipation a semi-statistical approach is used, and the gradient-diffusion hypothesis is adopted for turbulent transport. A priori tests of the localised eddy-viscosity closure and the gradient-diffusion closure are made by analysing data from direct numerical simulations. As an a posteriori testing case, the large eddy simulation of thermonuclear combustion in forced isotropic turbulence is discussed. We intend the formulation of the sub...

  13. Bluff Body Flow Simulation Using a Vortex Element Method

    SciTech Connect (OSTI)

    Anthony Leonard; Phillippe Chatelain; Michael Rebel

    2004-09-30T23:59:59.000Z

    Heavy ground vehicles, especially those involved in long-haul freight transportation, consume a significant part of our nation's energy supply. it is therefore of utmost importance to improve their efficiency, both to reduce emissions and to decrease reliance on imported oil. At highway speeds, more than half of the power consumed by a typical semi truck goes into overcoming aerodynamic drag, a fraction which increases with speed and crosswind. Thanks to better tools and increased awareness, recent years have seen substantial aerodynamic improvements by the truck industry, such as tractor/trailer height matching, radiator area reduction, and swept fairings. However, there remains substantial room for improvement as understanding of turbulent fluid dynamics grows. The group's research effort focused on vortex particle methods, a novel approach for computational fluid dynamics (CFD). Where common CFD methods solve or model the Navier-Stokes equations on a grid which stretches from the truck surface outward, vortex particle methods solve the vorticity equation on a Lagrangian basis of smooth particles and do not require a grid. They worked to advance the state of the art in vortex particle methods, improving their ability to handle the complicated, high Reynolds number flow around heavy vehicles. Specific challenges that they have addressed include finding strategies to accurate capture vorticity generation and resultant forces at the truck wall, handling the aerodynamics of spinning bodies such as tires, application of the method to the GTS model, computation time reduction through improved integration methods, a closest point transform for particle method in complex geometrics, and work on large eddy simulation (LES) turbulence modeling.

  14. Coarse-grained simulations of vortex dynamics and transition in complex high-Re flows

    SciTech Connect (OSTI)

    Grinstein, Fernando F [Los Alamos National Laboratory

    2011-01-21T23:59:59.000Z

    Turbulent flow complexity in applications in engineering, geophysics and astrophysics typically requires achieving accurate and dependable large scale predictions of highly nonlinear processes with under-resolved computer simulation models. Laboratory observations typically demonstrate the end outcome of complex non-linear three-dimensional physical processes with many unexplained details and mechanisms. Carefully controlled computational experiments based on the numerical solution of the conservation equations for mass, momentum, and energy, provide insights into the underlying flow dynamics. Relevant computational fluid dynamics issues to be addressed relate to the modeling of the unresolved tlow conditions at the subgrid scale (SGS) level - within a computational cell, and at the supergrid (SPG) scale - at initialization and beyond computational boundaries. SGS and SPG information must be prescribed for closure of the equations solved numerically. SGS models appear explicitly or implicitly as additional source tenns in the modified flow equations solved by the numerical solutions being calculated, while SPG models provide the necessary set of initial and boundary conditions that must be prescribed to ensure unique well-posed solutions. From this perspective, it is clear that the simulation process is inherently determined by the SGS and SPG information prescription process. On the other hand, observables in laboratory experiments are always characterized by the finite scales of the instrumental resolution of measuring/visualizing devices, and subject as well to SPG issues. It is thus important to recognize the inherently intrusive nature of observations based on numerical or laboratory experiments. Ultimately, verification and validation (V & V) frameworks and appropriate metrics for the specific problems at hand are needed to establish predictability of the simulation model. Direct numerical simulation (DNS) - resolving all relevant space/time scales, is prohibitively expensive in the foreseeable future for most practical flows of interest at moderate-to-high Reynolds number (Re). On the other end of the simulation spectrum are the Reynolds-Averaged Navier-Stokes (RANS) approaches - which model the turbulent effects. In the coarsegrained large eddy simulation (LES) strategies, the large energy containing structures are resolved, the smaller structures are filtered out, and unresolved SGS effects are modeled. By necessity - rather than choice, LES effectively becomes the intermediate approach between DNS and RANS. Extensive work has demonstrated that predictive simulations of turbulent velocity fields are possible using a particular LES denoted implicit LES (ILES), using the class of nonoscillatory finite-volume (NFV) numerical algorithms. Use of the modified equation as framework for theoretical analysis, demonstrates that leading truncation tenns associated with NFV methods provide implicit SGS models of mixed anisotropic type and regularized motion of discrete observables. Tests in fundamental applications ranging from canonical to very complex flows indicate that ILES is competitive with conventional LES in the LES realm proper - flows driven by large scale features. High-Re flows are vortex dominated and governed by short convective timescales compared to those of diffusion, and kinematically characterized at the smallest scales by slender worm vortices with insignificant internal structure. This motivates nominally inviscid ILES methods capable of capturing the high-Re dissipation dynamics and of handling vortices as shocks in shock capturing schemes. Depending on flow regimes, initial conditions, and resolution, additional modeling may be needed to emulate SGS driven physics, such as backscatter, chemical reaction, material mixing, and near-wall flow-dynamics - where typically-intertwined SGS/SPG issues need to be addressed. A major research focus is recognizing when additional explicit models and/or numerical treatments are needed and ensuring that mixed explicit and implicit SGS models can effectively act in

  15. The Local Variational Multiscale Method for Turbulence Simulation.

    SciTech Connect (OSTI)

    Collis, Samuel Scott; Ramakrishnan, Srinivas

    2005-05-01T23:59:59.000Z

    Accurate and efficient turbulence simulation in complex geometries is a formidable chal-lenge. Traditional methods are often limited by low accuracy and/or restrictions to simplegeometries. We explore the merger of Discontinuous Galerkin (DG) spatial discretizationswith Variational Multi-Scale (VMS) modeling, termed Local VMS (LVMS), to overcomethese limitations. DG spatial discretizations support arbitrarily high-order accuracy on un-structured grids amenable for complex geometries. Furthermore, high-order, hierarchicalrepresentation within DG provides a natural framework fora prioriscale separation crucialfor VMS implementation. We show that the combined benefits of DG and VMS within theLVMS method leads to promising new approach to LES for use in complex geometries.The efficacy of LVMS for turbulence simulation is assessed by application to fully-developed turbulent channelflow. First, a detailed spatial resolution study is undertakento record the effects of the DG discretization on turbulence statistics. Here, the localhp[?]refinement capabilites of DG are exploited to obtain reliable low-order statistics effi-ciently. Likewise, resolution guidelines for simulating wall-bounded turbulence using DGare established. We also explore the influence of enforcing Dirichlet boundary conditionsindirectly through numericalfluxes in DG which allows the solution to jump (slip) at thechannel walls. These jumps are effective in simulating the influence of the wall commen-surate with the local resolution and this feature of DG is effective in mitigating near-wallresolution requirements. In particular, we show that by locally modifying the numericalviscousflux used at the wall, we are able to regulate the near-wall slip through a penaltythat leads to improved shear-stress predictions. This work, demonstrates the potential ofthe numerical viscousflux to act as a numerically consistent wall-model and this successwarrents future research.As in any high-order numerical method some mechanism is required to control aliasingeffects due to nonlinear interactions and to ensure nonlinear stability of the method. Inthis context, we evaluate the merits of two approaches to de-aliasing -- spectralfilteringand polynomial dealiasing. While both approaches are successful, polynomial-dealiasingis found to be better suited for use in large-eddy simulation. Finally, results using LVMSare reported and show good agreement with reference direct numerical simulation therebydemonstrating the effectiveness of LVMS for wall-bounded turbulence. This success pavesthe way for future applications of LVMS to more complex turbulentflows.3

  16. AIAA JOURNAL Vol. 43, No. 3, March 2005

    E-Print Network [OSTI]

    Pitsch, Heinz

    , Center for Turbulence Research. Member AIAA. combustor the use of a large-eddy simulation (LES) flow- component phenomena, such as compressor/combustor instability and combustor/turbine hot-streak migration of a RANS flow solver for the compressor section, an LES flow solver for the combustor, and again a RANS

  17. This article was downloaded by: [Cornell University] On: 18 August 2012, At: 12:05

    E-Print Network [OSTI]

    of the statistics of two large-eddy simulation (LES) solutions de- scribing a piloted methane­air (Sandia D) flame. Chemical compo- sitions, density and temperature fields are modelled with a steady flamelet approach is solved, and the variance is computed from its definition. The comparison of the LES solutions is based

  18. dpasser les frontires Direction des ressources humaines

    E-Print Network [OSTI]

    van Tiggelen, Bart

    ........................................................................................................................................................12 II.2.3 Les infirmiers................................................................

  19. dpasser les frontires Direction des ressources humaines

    E-Print Network [OSTI]

    van Tiggelen, Bart

    ................................................................................................................12 II.2.3 Les infirmiers.................................................................

  20. Les Cahiers du GERAD

    E-Print Network [OSTI]

    2008-02-29T23:59:59.000Z

    la nature et les technologies. .... In most existing GSCM models, TPs are considered as fixed .... suppliers to plants, from plants to DCs or from DCs to customers).

  1. Les adultes reines ailes*

    E-Print Network [OSTI]

    Danchin, Etienne

    des travaux précis. La grosse soldat de la fourmi tortue bloque l'entrée du nid avec sa tête Les soldats de la fourmi maraudeuse peuvent tuer de gros scarabées Chez la fourmi pot de miel, certaines

  2. RAPPORT INTERNE Dveloppement de codes de simulations de

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    simulation Zgoubi [7] afin d'effectuer les études de dynamique complète qui constituent la majeure partie du

  3. A localised subgrid scale model for fluid dynamical simulations in astrophysics I: Theory and numerical tests

    E-Print Network [OSTI]

    W. Schmidt; J. C. Niemeyer; W. Hillebrandt

    2006-01-23T23:59:59.000Z

    We present a one-equation subgrid scale model that evolves the turbulence energy corresponding to unresolved velocity fluctuations in large eddy simulations. The model is derived in the context of the Germano consistent decomposition of the hydrodynamical equations. The eddy-viscosity closure for the rate of energy transfer from resolved toward subgrid scales is localised by means of a dynamical procedure for the computation of the closure parameter. Therefore, the subgrid scale model applies to arbitrary flow geometry and evolution. For the treatment of microscopic viscous dissipation a semi-statistical approach is used, and the gradient-diffusion hypothesis is adopted for turbulent transport. A priori tests of the localised eddy-viscosity closure and the gradient-diffusion closure are made by analysing data from direct numerical simulations. As an a posteriori testing case, the large eddy simulation of thermonuclear combustion in forced isotropic turbulence is discussed. We intend the formulation of the subgrid scale model in this paper as a basis for more advanced applications in numerical simulations of complex astrophysical phenomena involving turbulence.

  4. A simple analytical model to study and control azimuthal instabilities in annular combustion chambers

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    A simple analytical model to study and control azimuthal instabilities in annular combustion analytical method to compute the azimuthal modes appearing in annular combustion chambers and help analyzing exper- imental, acoustic and LES (Large Eddy Simulation) data obtained in these combustion chambers

  5. CTR Summer Program 2012 Presentation of Research Plans

    E-Print Network [OSTI]

    Prinz, Friedrich B.

    Large eddy simulation of self-noise from a wind turbine airfoil at high angle of attack 10:35am Further appropriate for turbine blades and unmanned aero-vehicles Hickel Stefan, Touber Emile Wall modeling for LES-Mach turbine blade 1:30pm Further discussion 1:35pm RANS Introduction by Kassinos Stavros Kassinos Stavros

  6. Center for Turbulence Research Annual Research Briefs 2003

    E-Print Network [OSTI]

    Apte, Sourabh V.

    multiphase flows in realistic gas turbine combustors By Frank Ham, Sourabh Apte, Gianluca Iaccarino, Xiaohua reacting flows in aircraft gas turbine combustor con- figurations using hybrid unstructured grids the combustion products that drive the downstream turbine. The Large Eddy Simulation (LES) ap- proach is used

  7. GEOPHYSICAL RESEARCH LETTERS, VOL. 28, NO. 13, PAGES 2637-2640, JULY 1, 2001 Ocean release of fossil fuel CO2: A case study

    E-Print Network [OSTI]

    Drange, Helge

    a 220 MW gas power plant, it is found that the volume of the near-source water with a pH-reduction 0 are 200, 400 and 800 Gg-CO2, corresponding to CO2 emissions from conventional 55-220 MW gas power plants], a local 3-dimensional large eddy simulation (LES) code (

  8. Multi-Scale Modelling Symposium A CSIRO cutting edge symposium 7-8 December 2009, Melbourne, Australia

    E-Print Network [OSTI]

    Raman, Venkat

    applications in drug delivery, catalysis, energy and semiconductors. Titanium dioxide (TiO2) nano University, Ames, IA 50011, USA ABSTRACT Titanium dioxide nano-particles are manufactured in flame reactors large-eddy simulation (LES) based computational tool for flame-based titanium dioxide synthesis

  9. Petascale Algorithms for Reactor Hydrodynamics Paul Fischer, James Lottes, David Pointer, and Andew Siegel

    E-Print Network [OSTI]

    Fischer, Paul F.

    -averaged Navier- Stokes) and subchannel models. Our initial study is focused on LES of sodium-cooled fast reactorPetascale Algorithms for Reactor Hydrodynamics Paul Fischer, James Lottes, David Pointer, and Andew describe recent algorithmic developments that have enabled large eddy simulations of reactor flows on up

  10. Les documents et les annotations du dossier patient hospitalier

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Les documents et les annotations du dossier patient hospitalier Sandra Bringay* , Catherine Barry hospitalier leur permettant de reproduire toutes les pratiques qu'ils réalisent avec le dossier papier. Nous tools for managing the patient record, allowing them to reproduce all the practices they realised

  11. QUINES SN LES ACTIVITATS

    E-Print Network [OSTI]

    Geffner, Hector

    A LA FORMACIÓ INTEGRAL I A LA PARTICIPACIÓ ACTIVA, LA UPF US OFEREIX LA POSSIBILITAT DE PARTICIPAR EN Jordi, el Programa Òpera Oberta i el concurs de bandes de la UPF; apuntar-vos als cursos i tallers de fer esport a la UPF participant a les lligues internes (bàsquet, futbol 7, futbol sala i torneig mixt

  12. Les calendriers Alain ARRAULT

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    'histoire, qui par chance dans le cas chinois ont été substituées par des tombes, fosses, grotte murée... Là où d calendriers ou fragments de calendriers auxquels nous nous référons ont été retrouvés dans le nord-ouest de la Chine dans les actuelles provinces du Xinjiang (Turfan) et du Gansu (Dunhuang, Juyan), sur la cote Est

  13. A filtered tabulated chemistry model for LES of premixed combustion

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    A filtered tabulated chemistry model for LES of premixed combustion B. Fiorinaa , R. Vicquelina to turbulent combustion regimes by including subgrid scale wrinkling effects in the flame front propagation Simulation, Turbulent premixed combustion, Tabulated chemistry 1. Introduction Flame ignition and extinction

  14. Les rsistances aux groupes religieux minoritaires en France

    E-Print Network [OSTI]

    Boyer, Edmond

    existé. Les cathares ont été éradiqués du paysage religieux : les premiers Témoins de Jéhovah américains

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

    SciTech Connect (OSTI)

    Grinstein, Fernando F [Los Alamos National Laboratory

    2009-01-01T23:59:59.000Z

    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.

  16. Objectif : Les hypertensions artrielles non contrles conduisent les cliniciens s'interroger sur les niveaux

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Résumé Objectif : Les hypertensions artérielles non contrôlées conduisent les cliniciens à s hight blood pressure leads clinicians to wonder about adherence degree amongst hypertensive patients). Semi-structured interviews were conducted with 68 hypertensive patients (39 women and 29 men, between

  17. Les annotations pour grer les connaissances du dossier patient

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    disposent toujours pas d'outils informatiques de gestion du dossier patient hospitalier leur permettant de rencontrées pour relier les outils de soins aux outils de management et de recherche. En effet, d'un côté

  18. Educational systems need appropriate animations and simulations Ruddy LELOUCHE

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    -mail: LELOUCHE@IFT.ULAVAL.CA Abstract Animations and simulations are often presented as tools for learning in a simulation-based system to help practising and learning algorithmics. Finally, the paper proposes a guideline, learning activity, knowledge type. Résumé Les animations et les simulations sont souvent présentées comme

  19. INCITE Projects 2012 INCITE Projects

    E-Print Network [OSTI]

    Kemner, Ken

    : 4 Million Hours Large-Eddy Simulation of Two-Phase Flow Combustion in Gas Turbines Thierry Poinsot

  20. Examining A Hypersonic Turbulent Boundary Layer at Low Reynolds Number

    E-Print Network [OSTI]

    Semper, Michael Thomas

    2013-05-15T23:59:59.000Z

    z spanwise direction, m Greek Symbols boundary layer thickness, m displacement thickness, m ratio of speci c heats hotwire recovery ratio dynamic viscosity, Pa s density, kg=m3 hotwire overheat ratio, Twire=Tt momentum thickness, m... direct numerical simulation LDV laser doppler velocimetry LES large eddy simulation MTV molecular tagging velocimetry OHR overheat ratio (see ) PIV particle image velocimetry PLIF planar laser induced uorescence RANS Reynolds averaged Navier...

  1. LE TOURISME DANS LES OASIS D'ALGERIE LE TOURISME SCIENTIFIQUE A TRAVERS LES CRATERES

    E-Print Network [OSTI]

    Boyer, Edmond

    1 LE TOURISME DANS LES OASIS D'ALGERIE LE TOURISME SCIENTIFIQUE A TRAVERS LES CRATERES, historiques, architecturaux, exotiques et autres. Les Oasis, en tant que zones singulières qui tranchent avec'excellence pour un tourisme particulier : le tourisme oasien. Les Oasis parsèment le désert saharien en Algérie

  2. Scenariser les possibles energetiques. Les gaz de schiste dans la matrice des

    E-Print Network [OSTI]

    Boyer, Edmond

    'utilisation de la fracturation hydraulique (fracking ou hydraulic fracturing dans les mondes anglophones) ont

  3. MONITORING GEOCHIMIQUE PAR COUPLAGE ENTRE LES GAZ

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    on its use. Key words: Geological sequestration of CO2, monitoring, noble gases, carbon isotopes1 MONITORING GEOCHIMIQUE PAR COUPLAGE ENTRE LES GAZ RARES ET LES ISOTOPES DU CARBONE : ETUDE D GAZ RARES ET LES ISOTOPES DU CARBONE : ETUDE D'UN RESERVOIR NATUREL Présentée devant : L

  4. Ignition sequence of an annular multi-injector combustor

    E-Print Network [OSTI]

    Philip, Maxime; Vicquelin, Ronan; Schmitt, Thomas; Durox, Daniel; Bourgoin, Jean-François; Candel, Sébastien

    2013-01-01T23:59:59.000Z

    Ignition is a critical process in combustion systems. In aeronautical combustors, altitude relight capacities are required in case of accidental extinction of the chamber. A simultaneous study of light-round ignition in an annular multi-injector combustor has been performed on the experimental and numerical sides. This effort allows a unique comparison to assess the reliability of Large-Eddy Simulation (LES) in such a configuration. Results are presented in fluid dynamics videos.

  5. SUSY Les Houches Accord 2

    SciTech Connect (OSTI)

    Allanach, B.; Balazs, C.; Belanger, G.; Bernhardt, M.; Boudjema, F.; Choudhury, D.; Desch, K.; Ellwanger, U.; Gambino, P.; Godbole, R.; Goto, T.; /Cambridge U., DAMTP /Monash U. /Annecy, LAPTH /Bonn U. /Harish-Chandra Res. Inst. /Orsay, LPT /Turin U. /INFN, Turin /Bangalore, Indian Inst. Sci. /KEK, Tsukuba /Barcelona U.

    2007-11-08T23:59:59.000Z

    The Supersymmetry Les Houches Accord (SLHA) [1] provides a universal set of conventions for conveying spectral and decay information for supersymmetry analysis problems in high energy physics. Here, we propose extensions of the conventions of the first SLHA to include various generalizations: the minimal supersymmetric standard model with violation of CP, R-parity, and flavor, as well as the simplest next-to-minimal model.

  6. Les Mmoires d'Uranie la merveilleuse histoire de l'Astronomie Daniel BENEST

    E-Print Network [OSTI]

    Michel, Patrick

    observations Le noble astronome (Tycho Brahe) Les nouveaux yeux (Galilée) 6. Les arpenteurs du cosmos Les

  7. COMPARAISON DE METHODES DE CRIBLAGE POUR LA SIMULATION NUMERIQUE Michelle SERGENT1

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    méthodes de criblage. L'étude présentée porte sur la simulation d'un gisement d'hydrocarbures exploité par sur les variables de sortie, à savoir la production cumulée d'hydrocarbure à différents temps. Les les productions cumulées d'hydrocarbure à différents temps ont été étudiées. La résolution du système

  8. Direct numerical simulations of type Ia supernovae flames II: The rayleigh-taylor instability

    E-Print Network [OSTI]

    Bell, J.B.; Day, M.S.; Rendleman, C.A.; Woosley, S.E.; Zingale, M.

    2004-01-01T23:59:59.000Z

    Weaver, T. A. 1994, in Supernovae, Les Houches, Session LIV,Simulations of Type Ia Supernovae Flames II: The Rayleigh-Subject headings: supernovae: general — white dwarfs —

  9. Proposition de sujet de thse tude de nano/micro contact pour les nanotubes et les

    E-Print Network [OSTI]

    Bezerianos, Anastasia

    Proposition de sujet de thèse Étude de nano/micro contact pour les nanotubes et les nanocomposites) que pour des nanostructures hybrides (NTC recouverts de polypyrrole, NTC dans une matrice polymère ou

  10. Janvier 2011 Les paradoxes de la quinoa

    E-Print Network [OSTI]

    , les agriculteurs se sont mis à cultiver des zones de plaine où les risques de gelée nocturne sont familles de l'Altiplano andin un exode définitif vers les villes ou l'étranger, il altère la durabilité du'exposition par rapport au soleil3 . Quinoa versus élevage Accaparant des plaines jusqu'alors dédiées au pâtu

  11. Les business models dans la distribution : reprer les chemins de la performance 1

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Les business models dans la distribution : repérer les chemins de la performance 1 Pierre Volle peuvent être adressées à pierre.volle@dauphine.fr 2 Les business models dans la distribution : repérer les business model (BM) reste largement à préciser. L'objectif de cet article est donc de mettre en évidence

  12. cole sur les bonnes pratiques organisationnelles

    E-Print Network [OSTI]

    Canet, Léonie

    · Nitrates, sulfates · Phtalates · Hydrocarbures · Métaux lourds · Particules · Hydrocarbures · Thermique · Hydrocarbures · Métaux lourds · Dioxines, furanes · Particules · Subst. chimiques #12;École sur les bonnes

  13. Direct numerical simulation of turbulent reacting flows

    SciTech Connect (OSTI)

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

    1993-12-01T23:59:59.000Z

    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.

  14. accelerators les accelerateurs: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    les grandes Jeanjean, Louis 36 Myriam Catusse Les rinventions du social dans le Maroc Physics Websites Summary: organizations. This acceleration of social reform is based...

  15. associes pour les: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    mode de gouvernance associatif peut se Boyer, Edmond 2 Les risques sismiques Mrida (Venezuela). Pour une association des communauts la prvention de catastrophe dans les Physics...

  16. LES COULISSES DU CYBERART Anne SAUVAGEOT

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    « Les coulisses du Cyberart », In Pessin, A. & Majastre, O. (sld), Vers une sociologie des oeuvres, L'Harmattan-Olivier Majastre et Alain Pessin L'Harmattan, Logiques sociales Le colloque " vers une sociologie des oeuvres " s

  17. 25-26 octobre Les dcideu

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    'épandeurs, plifié nommé (2007-2011) de machines e les impact s et les différe ACV3E, l'ut t de connaît u champ enviro ycle Assess derstand the e user can c h of them for ibilities rega design supp " attendu pa@irstea.fr 34196 Montp soin d'outils d contraintes q ublics et priv éthode Bilan impacts en

  18. Efficient Parallelization of RMCRT for Large Scale LES Combustion Simulations

    E-Print Network [OSTI]

    Utah, University of

    = Absorption coefficient = Solid angle = Scattering phase function = Stefan-Boltzmann constant s = Scattering coefficient G = Incident radiation function Iin = Incoming intensity Iout = Outgoing Intensity N modeled the behavior of neutrons and involved following the histories of these neutrons during fission

  19. LES Simulations of Turbulent Combustion in a Type Ia Supernovae

    E-Print Network [OSTI]

    New York at Stoney Brook, State University of

    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

  20. Les gographes et les frontires austro-slovnes des Alpes orientales en 1919-1920 : entre la Mitteleuropa et les Balkans ,

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Mitteleuropa et les Balkans », Revue de Géographie alpine, 2001, n°4, pp.173-184 Coordonnées de l : entre la Mitteleuropa et les Balkans. Emmanuelle BOULINEAU, in Revue de géographie alpine, 2001- 4, pp

  1. MISE AU POINT LES MOBILITS DES IONS DANS LES HYDROCARBURES LIQUIDES

    E-Print Network [OSTI]

    Boyer, Edmond

    495. MISE AU POINT LES MOBILITÉS DES IONS DANS LES HYDROCARBURES LIQUIDES Par JACQUES MATHIEU, JEAN hydrocarbures liquides, on étudie la variation de cette mobilité en fonction de la viscosité du liquide et de la des- cription des méthodes de mesures des mobilités ioniques dans le cas des hydrocarbures liquides et

  2. LES GRAVURES RUPESTRES DE JORDANIE DU SUD ET ENQUTE SUR LES PRATIQUES DE CHASSE ACTUELLES

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    portrait du chasseur: ses qualités mora- les et physiques. Mots-clés: Jordanie, Arabie, Wadi Ramm, al qualities. Key words: Jordan, Arabia, Wadi Ramm, Al-Hwaïtat, hunting, hunters, inscriptions, north Arabic le Wadi Ramm, sur une zone de 50 km2 environ aux alentours du village de Ramm (fig. 1). Les

  3. tion des environs par quatre groupes prin-cipaux de polluants : i) les hydrocarbures

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    tion des environs par quatre groupes prin- cipaux de polluants : i) les hydrocarbures aromatiques simples; ii) les hydrocarbures aliphatiques ; iii) les hydrocarbures aroma- tiques polycycliques (HAP

  4. The role of large eddy fluctuations in the Madison Dynamo Experiment

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over OurThe Iron Spin Transition in the Earth'sConnect,LLC THEofMaterials

  5. soleil, parce que les pinceaux lumineux qui forment les images sont moins dlis et les foyers moins prcis.

    E-Print Network [OSTI]

    Boyer, Edmond

    AU PHÉNOMÈNE DE PELTIER; PAR M. BOUTY. 1. On sait que, quand on décompose par la pile un sel dissous les phénomènes observés soit à l'action chimique principale, soit à une cause analogue à celle qui part à la pro- duction du courant que celle-là seule se distrib

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

    Office of Scientific and Technical Information (OSTI)

    Technologies Office Country of Publication: United States Language: English Subject: 17 WIND ENERGY WIND PLANT AERODYNAMICS; DYNAMIC WAKE MEANDERING; LARGE-EDDY SIMULATION; Wind...

  7. Sandia National Laboratories: Transportation Energy

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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

  8. ENERGIA DE L'OCE`A Energia de les ones

    E-Print Network [OSTI]

    Batiste, Oriol

    . #12;ENERGIA T`ERMICA OCE`ANICA El mar acumula energia solar a gran escala (1/4 de l'energia que arrivaENERGIA DE L'OCE`A · Energia de les ones · Energia de les marees · Energia t`ermica oce`anic · Energia de les corrents oce`aniques #12;ENERGIA DE LES ONES En algunes zones 40-70 kW/m Aig¨ues profundes

  9. LES DETERMINANTS DES COMPETENCES DE LA FONCTION GESTION-FINANCE

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    LES DETERMINANTS DES COMPETENCES DE LA FONCTION GESTION-FINANCE Pierre-Laurent, Bescos Professeur'enjeu est de donner alors aux étudiants et professionnels de la fonction gestion-finance une formation de, les aptitudes et les grades au sein de la fonction gestion-finance. Mots clés : compétences, enquête

  10. 16. L'ambig uitat de les llengues naturals

    E-Print Network [OSTI]

    Forcada, Mikel L.

    ­ terpretaci â?? o correcta: a) (angl.) ``The soldiers shot at the women and I saw them fall'' (``Els soldats van disparar a les dones i els vaig veure cau­ re'' ---els soldats--- o ``...i les vaig veure caure'' ---les

  11. INTERNET EN RECEPTIONS, LES PROVINCES DE L'ART

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    réception(s), L'Harmattan, Paris, pp. 33-48. #12;2 LES NON-PUBLICS - Les arts en réception Tome I - Sous la direction de Pascale Ancel et Alain Pessin L'Harmattan, Logiques sociales Les statistiques de la sociologie

  12. Les oasis du Tafilalet Dans les oasis du Tafilalet, province situe l'est du Maroc, il faut aller

    E-Print Network [OSTI]

    Les oasis du Tafilalet Dans les oasis du Tafilalet, province située à l'est du Maroc, il faut aller T E R R A N � E Maroc #12;

  13. M'etriques sur les poly`edres hyperboliques convexes Jean-Marc Schlenker *

    E-Print Network [OSTI]

    Schlenker, Jean-Marc

    M'etriques sur les poly`edres hyperboliques convexes Jean'espace obtenu a une notion na- turelle de poly`edres; on d'ecrit les "m'etriques" induites sur les poly concernant les m'etriques induites et les m'etriques duales sur les poly`edres hyperboliques convexes

  14. Algrie : les illusions de la richesse ptrolire

    E-Print Network [OSTI]

    Boyer, Edmond

    Trente ans après la nationalisation des hydrocarbures, la richesse pétrolière accumulée semble avoir hydrocarbures se trouve placé une fois de plus au coeur de la politique de développement. Le dynamisme du, comme dans les années 1970, cette croissance s'avère entièrement dépendante du secteur des hydrocarbures

  15. Squestration biologique du carbone par les cyanobactries

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    . ______________________________________________________________________________________________________ TITRE en anglais Biological carbon sequestration by cyanobacteria1 Séquestration biologique du carbone par les cyanobactéries THESE PRESENTEE POUR L'OBTENTION DU, qui peuvent fixer du CO2 sous forme de biomasse et carbonate de calcium. Ce dernier, insoluble dans l

  16. Three-dimensional hydrodynamic simulations of the combustion of a neutron star into a quark star

    E-Print Network [OSTI]

    Matthias Herzog; Friedrich K. Roepke

    2011-09-02T23:59:59.000Z

    We present three-dimensional numerical simulations of turbulent combustion converting a neutron star into a quark star. Hadronic matter, described by a micro-physical finite-temperature equation of state, is converted into strange quark matter. We assume this phase, represented by a bag-model equation of state, to be absolutely stable. Following the example of thermonuclear burning in white dwarfs leading to Type Ia supernovae, we treat the conversion process as a potentially turbulent deflagration. Solving the non-relativistic Euler equations using established numerical methods we conduct large eddy simulations including an elaborate subgrid scale model, while the propagation of the conversion front is modeled with a level-set method. Our results show that for large parts of the parameter space the conversion becomes turbulent and therefore significantly faster than in the laminar case. Despite assuming absolutely stable strange quark matter, in our hydrodynamic approximation an outer layer remains in the hadronic phase, because the conversion front stops when it reaches conditions under which the combustion is no longer exothermic.

  17. LE BULLETIN DE L'EPI N 66 LES MATHMATOCRATES ONT-ILS TU LOGO LES MATHMATOCRATES ONT-ILS TU

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    129 LE BULLETIN DE L'EPI N° 66 LES MATHÉMATOCRATES ONT-ILS TUÉ LOGO LES « MATHÉMATOCRATES » ONT-ILS TUÉ LE LANGAGE LOGO ? LES « TECHNOCRATES » LE SAUVERONT-ILS ? Paul DELANNOY Les médias d congrès pour lesquelles une réflexion sur ce point a été jugée nécessaire par les expérimentateurs : Logo

  18. Models simulation and interoperability using MDA and HLA

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Models simulation and interoperability using MDA and HLA Hind El Haouzi CRAN (UMR 7039), University manufacturing environments. Our paper advocates for an approach combining MDA (model driven architecture interopérabilité dans le contexte de la simulation distribuée. Nos travaux visent à combiner les architectures MDA

  19. Mcanismes de prcipitation de carbonate de calcium dans les biofilms photosynthtiques

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Mécanismes de précipitation de carbonate de calcium dans les biofilms photosynthétiques Pascale carbonate de calcium dans les systèmes benthiques est souvent associée aux biofilms photosynthétiques, et, les stromatolithes et les microbialithes. Cette biocalcification modifie les flux de CO2, de calcium

  20. ENQUETE SUR LES CONSEQUENCES DE L'UTILISATION D'UN OUTIL DE DIAGNOSTIC "DEVELOPPEMENT

    E-Print Network [OSTI]

    Boyer, Edmond

    » DANS LES PME PMI". Alain van Cuyck Introduction : Le Développement durable comme dispositif symbolique durable. 2. Le cas spécifique des PME/PMI Si les grandes entreprises et les multinationales se sont déjà dans la structure et les représentations des PME / PMI en France, les entreprises s'engageant dans

  1. Les fonctions holomorphes et méromorphes dans le cercle-unité

    E-Print Network [OSTI]

    A. Bloch

    2011-06-28T23:59:59.000Z

    systématique la même théorie, à partir de la fonction modulaire. On peut, à ce point de vue, condenser les propositions de MM. Pi- card, Landau, Schottky [26, ...

  2. applications dans les: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Information Sciences Websites Summary: 'utilisation de la fracturation hydraulique (fracking ou hydraulic fracturing dans les mondes anglophones) ont de provoquer et...

  3. atomique dans les: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Information Sciences Websites Summary: 'utilisation de la fracturation hydraulique (fracking ou hydraulic fracturing dans les mondes anglophones) ont de provoquer et...

  4. actinides dans les: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Information Sciences Websites Summary: 'utilisation de la fracturation hydraulique (fracking ou hydraulic fracturing dans les mondes anglophones) ont de provoquer et...

  5. argentine dans les: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Information Sciences Websites Summary: 'utilisation de la fracturation hydraulique (fracking ou hydraulic fracturing dans les mondes anglophones) ont de provoquer et...

  6. atmospheriques dans les: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Information Sciences Websites Summary: 'utilisation de la fracturation hydraulique (fracking ou hydraulic fracturing dans les mondes anglophones) ont de provoquer et...

  7. SUR LES STROLS DU POLLEN Marie-France HGEL

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    algues rouges et, tout récemment, par JONHSON, BENNET et H!!2Mnrrrr (1963) dans les plantes supérieures

  8. LES EXCITATIONS 1 TROU -1 PARTICULE DANS LES NOYAUX 58Ni et 56Co

    E-Print Network [OSTI]

    Boyer, Edmond

    in 58Ni and 56Co using shell model technics and SDI potential. Nuclear levels and reduced transition for levels at low energies in 58Ni and 56Co, 1p-1h excitations do not however improve greatly earlier results couche f7/2) et qu'en outre les energies individuelles sont insuffisamment connues. D'autres travaux [3

  9. au circuit donne : Eliminons les flux V~ et V 2 entre les trois relations ainsi obtenues,

    E-Print Network [OSTI]

    Boyer, Edmond

    -activity of thorium salts (Sur la radioactivité des sels de thorium). - P. 93-100. L'auteur, H.-M. Dadourian, enfin H années les sels de thorium du commerce, par rapport à celle des minéraux de thorium, par l'existence d'un produit radioactif, le mésothorium, intermé- diaire entre le thorium et le radiothorium, n'émettant pas de

  10. Atmospheric Boundary Layer Studies with Unified RANS-LES and Dynamic LES Methods

    E-Print Network [OSTI]

    Heinz, Stefan

    computational cost. Details about the characteristic features of these methods and applications to channel flow and the numerical method applied. The results obtained by unified and dynamic LES models are discussed in section IV of Mechanical Engineering, 1000 E. University Avenue, Laramie WY 82071. PhD student, Department of Mathematics

  11. Martine Azam, "Les non-publics, Les arts en rception", Paris, 2004, L'harmattan, Collection Logiques sociales, tome 2, p 67 83

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Martine Azam, "Les non-publics, Les arts en réception", Paris, 2004, L'harmattan, Collection) (ANCEL Pascal) (2004) p." #12;Martine Azam, "Les non-publics, Les arts en réception", Paris, 2004, L'harmattan

  12. To link to this article: DOI:10.1016/j.pecs.2012.04.004 URL : http://dx.doi.org/10.1016/j.pecs.2012.04.004

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    flames in gas turbine combustion chambers. (2012) Progress in Energy and Combustion Science, vol. 38 (n.pecs.2012.04.004 #12;Large Eddy Simulations of gaseous flames in gas turbine combustion chambers L Keywords: Large Eddy Simulations Complex geometry Swirled flows Gaseous combustion Turbulent combustion Gas

  13. SeyedHosseinHezaveh 410-662-2787 | shezaveh@princeton.edu

    E-Print Network [OSTI]

    Bou-Zeid, Elie

    research area: Large eddy simulations of Vertical Axis Wind Turbines M.Sc. | 2008-2011 | Sharif University of technology · Major: Civil and Environmental Engineering · Minor: Hydraulic Structures · Thesis: Numerical Research Interests Hybrid Wind Turbine Design Computational Mechanics Green Energy Large Eddy Simulations

  14. Center for Turbulence Research Annual Research Briefs 2001

    E-Print Network [OSTI]

    Apte, Sourabh V.

    Center for Turbulence Research Annual Research Briefs 2001 3 Large-eddy simulation of gas turbine, and solver capable of performing large-eddy simulation in geometries as complex as the combustor of a gas-turbine' grids encountered in complex geometries such as the Pratt & Whitney combustor. · Turbulent validations

  15. Ecotoxicit des terres rares Les terres rares sont un groupe de mtaux qui

    E-Print Network [OSTI]

    Wehrli, Bernhard

    'automobile pour dépolluer les gaz d'échappement constituent le principal débouché des terres rares (tout véhicules hybrides, les turbines d'éoliennes ainsi que dans le nucléaire et l'armement. Les terres rares ont

  16. e x p o s i t i o n les territoires de l'eau

    E-Print Network [OSTI]

    - Le delta du Nil Panneau 15 - Deltas - La Camargue Panneau 16 - Oasis - Les liens de l'eau Panneau 17 - Oasis - Les oasis du Jérid Panneau 18 - Oasis - Les oasis du Tafilalet Panneau 19 - Défis - Une

  17. Simulations Data Simulation Type

    E-Print Network [OSTI]

    Wang, Xiaorui "Ray"

    to request different simulations data. The flow chart above demonstrates the different steps and options@ornl.gov) Autotune Drupal 7 CMS Current building energy models (BEMs), using EnergyPlus or other simulations, are unreliable because they have to constantly be calibrated to match actual energy usage data. Currently

  18. Sur les thories des dilectriques Par Tcheslas BIALOBJESKI

    E-Print Network [OSTI]

    Boyer, Edmond

    pôle de la batterie (l'autre pôle étant au sol), il se produit par induction une charge Fig. 1 décharge du condensateur en réunissant les armatures entre elles, les charges inductives se neutralisent en- sateur plan. Faisons communiquer une armature de ce condensateur avec une batterie de petits accumula

  19. dpasser les frontires d'AlAn Turing

    E-Print Network [OSTI]

    van Tiggelen, Bart

    première pierre de notre monde numérique. Dix ans plus tard, le même Alan Turing par- ticipe d puisse paraître, les contributions d'Alan Turing ne s'arrêtent pas là. Il a participé, pen- dantla, mathématiques, informatique, biologie : Alan Turing est le symbole éclatant de l'art de faire dialoguer les

  20. Les 10 mois du rectorat Weber Bilan et perspectives

    E-Print Network [OSTI]

    Halazonetis, Thanos

    Les 10 mois du rectorat Weber Bilan et perspectives Septembre 2006 - juillet 2007 #12;Sommaire Sauf les femmes. Composition du rectorat Weber 2 Préambule 3 10 mois de coopération et d'ouverture 4 10 transformations structurelles 10 Pour conclure 11 Bilan et perspectives du rectorat Weber Septembre 2006 - juillet

  1. Les pratiques pdagogiques exemplaires en sciences de l'information

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Les pratiques pédagogiques exemplaires en sciences de l'information : 15 fiches annotées Projet d bibliothéconomie et des sciences de l'information Université de Montréal Août 2005 #12;Les pratiques pédagogiques exemplaires en sciences de l'information Page 2 sur 110 Table des matières 1. Introduction

  2. LES PIRATES DU CYBERART, INCONFORT TECHNIQUE ET CONTAMINATION

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ), Les oeuvres noires de l'art et de la Littérature , L'Harmattan, Paris, pp. 31-50. #12;2 LES OEUVRES-Caroline Vanbremeersch L'Harmattan, Logiques sociales - Sociologie de la connaissance L'art du noir a traversé le siècle

  3. LES OUTILS DE CONTROLE DE GESTION DANS LE CONTEXTE DES

    E-Print Network [OSTI]

    Boyer, Edmond

    LES OUTILS DE CONTROLE DE GESTION DANS LE CONTEXTE DES PME : CAS DES PMI AU LIBAN Numéro d différents outils de contrôle de gestion utilisés dans les PMI libanaises et plus précisément, d gestion ­ outil de contrôle ­ calcul de coût Key words: SME - management control - cost control

  4. ISO 9001 : LES ENJEUX DU RECOURS A UN REFERENTIEL

    E-Print Network [OSTI]

    Boyer, Edmond

    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

  5. Nadge Ragaru lections, lgitimit politique et stabilit dans les Balkans : le lien

    E-Print Network [OSTI]

    Boyer, Edmond

    Nadège Ragaru Élections, légitimité politique et stabilité dans les Balkans : le lien manquant In. Élections, légitimité politique et stabilité dans les Balkans : le lien manquant. In: Revue d

  6. LES Applied to Low-Temperature, Diesel and Hydrogen Engine Combustion...

    Energy Savers [EERE]

    LES Applied to Low-Temperature, Diesel and Hydrogen Engine Combustion Research LES Applied to Low-Temperature, Diesel and Hydrogen Engine Combustion Research Presentation from the...

  7. Certificat Interuniversitaire en Management de la Qualit dans les Etablissements de Soins

    E-Print Network [OSTI]

    Nesterov, Yurii

    , les médecins et les infirmier(e)s ont intérêt à être outillés sur le plan des concepts et sur celui

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

    SciTech Connect (OSTI)

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

    2009-01-01T23:59:59.000Z

    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.

  9. Les Mesures Techniques de Protection... autrement dit les DRM. Teddy Furon, Thomson Security Lab

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    littéraire et artistique incluse dans le Code de la Propriété Intellectuelle, CPI. Très schématiquement, deux lois sont en fait élaborées au niveau international pour homogénéiser le code de la propriété seulement condamnés parce qu'ils spolient les intérêts des ayants- droit, mais aussi parce qu'ils ont

  10. Simulation du transfert de polluants dans les sols et les eaux souterraines : recommandations pour le choix du modle

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    'obtention de résultats exploitables pour parvenir à une gestion raisonnée et proportionnée d'une pollution. Or 1.5 2 2.5 3 3.5 ConcentrationenPCE(µg/l) S-2 S-3 PLPR-3S-5 BV BIOCHLOR NAS ANTEA ENVIROS INERIS

  11. Un modle et une algbre pour les systmes de gestion d'ontologies

    E-Print Network [OSTI]

    Genève, Université de

    Un modèle et une algèbre pour les systèmes de gestion d'ontologies Gilles Falquet Claire, guyot@cui.unige.ch Résumé. Nous présentons ici une approche pour la gestion de bases d'ontolo- gies systèmes de gestion qui permettent non seulement de les stocker mais également de les aligner et de les

  12. Comptes Rendus des JNC 17 -Poitiers 2011 Simulation par lments finis des procds par infusion de rsine

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Comptes Rendus des JNC 17 - Poitiers 2011 Simulation par éléments finis des procédés par infusion de résine Finite Simulation of the liquid infusion processes G. Pacquaut, J. Bruchon, N. Moulin, S permettant de simuler par éléments finis les procé- dés par infusion de résine au travers de renforts fibreux

  13. La politique de la Turquie dans les Balkans depuis 1990

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    La politique de la Turquie dans les Balkans depuis 1990 Relations bilatérales, politique régionale Yérasimos, Professeur des universités, politologue et historien, spécialiste de la Turquie et des Balkans Balkans, deuxième rapporteur Ahmet Insel, Maître de conférences, économiste, université Paris 1

  14. Formations pluridisciplinaires Franais pour les Professionnels de Sant non francophones

    E-Print Network [OSTI]

    Européen Commun de Référence pour les Langues Tarif 900 médecins/infirmier(e)s individuels 1 350 prise en charge employeurs Mots-clés : Français Langue Etrangère, FLE, Médical, Infirmier Contact Pédagogique

  15. Mathrice, une communaut, un rseau, une quipe pour les mathmatiques

    E-Print Network [OSTI]

    Menichi, Luc

    'infrastructure est entamée : des mécanismes basés sur des API REST sont déployés en périphérie sur les serveurs

  16. Les domestiques sngalaises au Maroc: Un travail servile entre tradition et modernit

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Les domestiques sénégalaises au Maroc: Un travail servile entre tradition et modernité Nazarena'hui le Maroc et le Sénégal et à poser les bases d'une quasi libre circulation entre les deux pays. Les femmes de ménage sénégalaises vers le Maroc. Aujourd'hui, même s'ils ne sont plus les seuls à déterminer

  17. M'etriques sur les poly`edres hyperboliques convexes JeanMarc Schlenker \\Lambda

    E-Print Network [OSTI]

    Schlenker, Jean-Marc

    M'etriques sur les poly`edres hyperboliques convexes Jean­Marc Schlenker \\Lambda 24 F'evrier 1997 a une notion na­ turelle de poly`edres; on d'ecrit les ``m'etriques'' induites sur les poly`edres'etriques induites et les m'etriques duales sur les poly`edres hyperboliques convexes. Divers r'esultats interm

  18. 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]

    Paris-Sud XI, Université de

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

  19. russIe : Mesurer les rIsques, saIsIr les opportunIts avril mai juin 2007 analyse FInancIre n 23

    E-Print Network [OSTI]

    Boyer, Edmond

    industries des hydrocarbures et leurs enjeux pour les marchés énergétiques internationaux. Catherine pétrolières internationa- les, la reprise en main du secteur des hydrocarbures par l'État russe sont autant de

  20. POINT DE VUE SUR LES REFORMES EN COURS DANS LE SYST`EME EDUCATIF 61 Point de vue sur les reformes en

    E-Print Network [OSTI]

    Demailly, Jean-Pierre

    POINT DE VUE SUR LES R´EFORMES EN COURS DANS LE SYST`EME ´EDUCATIF 61 Point de vue sur les r´eformes'^etre confront´e `a la r´eflexion sur les r´eformes, que ce soit `a l'Acad´emie des Sciences, `a l'Universit´e ou contenus de programmes reculent de r´eforme en r´eforme; jamais me semble-t-il les coll`egues ne s

  1. SimStudio : une Infrastructure pour la Modlisation, la Simulation et

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    transformation features (code generation, among others) in order to smooth the modeling and simulation cycle fonctionnalités de transformations de modèles (entre autres de la génération de code) afin de simplifier le cycle de modèles de plus en plus compliqués, soit parce qu'ils approchent de plus en plus la complexité du

  2. RSUME DU SUJET PROPOS TITRE : Des ponges en nanocelluloses contre les mares noires

    E-Print Network [OSTI]

    Saut, Olivier

    'avenir aider à lutter contre les catastrophes causées par le déversement de pétrole et autres hydrocarbures modifiées ­ absorbe les nappes d'hydrocarbures, reste à la surface de l'eau et peut être ensuite facilement

  3. INFLUENCE D'ADDITIFS ANTI-AGGLOMERANT SUR LES PROPRIETES DE TRANSPORT DES HYDRATES DE

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    partir de gaz, d'eau et d'hydrocarbures sous pression. Les conditions de formation sont généralement réunies pendant le transport d'hydrocarbures dans les canalisations submersibles entre la tête de puits et

  4. Approches Statistique et Linguistique Pour la Classification de Textes d'Opinion Portant sur les Films

    E-Print Network [OSTI]

    collection textuelle les textes porteurs d'opinion, ou encore à localiser les passages porteurs d'opi- nion baissé...) ; ­ la classification d'opinion, qui a pour but d'attribuer une étiquette au texte selon l'opi

  5. Les huiles essentielles La flore de la Nouvelle-Caldonie est extrmement diversifie, avec un taux

    E-Print Network [OSTI]

    Royaume-Uni et d'Europe, et ce, dès les années 1890. Turbina inopinata ou Guirlande des bois, espèce

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

    E-Print Network [OSTI]

    Boyer, Edmond

    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

  7. Approche Mthodologique de la modlisation du transport des HAP dans les sols et les eaux

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    hydrocarbures aromatiques polycycliques (HAP) ont fait l'objet de simulations par deux groupes de travail. Le durée de 10 ans. Le naphtalène révèle un comportement d'hydrocarbure " lourd " avec une phase huile

  8. Jacques Rupnik Recomposition guerrire dans les Balkans... -Juin 2000 http://www.ceri-sciences-po.org

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Jacques Rupnik ­ Recomposition guerrière dans les Balkans... - Juin 2000 http-30 mai 2000 RECOMPOSITION GUERRIERE DANS LES BALKANS ET CONSTRUCTION D'ETATS-NATIONS HOMOGENES1 Jacques Rupnik Une décennie de guerres s'achève dans les Balkans avec 250 000 morts, plusieurs millions de

  9. Universit Pierre Mends-France de Grenoble Rflexions sur les difficults conomiques auxquelles sont

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    auxquelles sont confrontés les pays exportateurs d'hydrocarbures Document à l'appui d'une conférence donnée à pour les pays dotés de fortes richesses en hydrocarbures de s'engager sur la voie d'un développement et durable. Ce n'est pourtant pas ce processus qui s'est mis en place dans les pays exportateurs d'hydrocarbures

  10. SURVEILLANCE DE LA CONTAMINATION CHIMIQUE EN MDITERRANE BASE SUR LES CAPACITS ACCUMULATRICES

    E-Print Network [OSTI]

    Boyer, Edmond

    1 SURVEILLANCE DE LA CONTAMINATION CHIMIQUE EN MÉDITERRANÉE BASÉE SUR LES CAPACITÉS ACCUMULATRICES contaminants chimiques directement dans la colonne d'eau est coûteuse, difficilement interprétable et peu difficultés, les contaminants peuvent être mesurés dans la chair de bioaccumulateurs naturels comme les moules

  11. 1946-2010: Worldwide Hurricane Activity Les Hatton

    E-Print Network [OSTI]

    Hatton, Les

    1946-2010: Worldwide Hurricane Activity Les Hatton March 5, 2011 Abstract This paper complements Storms, Hurricanes and major Hurricanes, (3 or larger on the Saffir- Sampson scale). 2010 has been one to be very active. Keywords: Severe weather event frequency, Hurricanes, global warming 1 Document revision

  12. Les spectacles et soires Cinma, thtre, musique, soire dansante

    E-Print Network [OSTI]

    Jeanjean, Louis

    Soirée à la Mez, 10 chemin de Mazagran Départ en bus : 21h30 arrêt de bus « Arago » (Campus Bouloie) etLes animations Mardi 5 Petit Kursaal 20h30 3 vendredi 8 Discothèque La MEZ Gratuit Informations activités

  13. DEGRADATION F.T TRANSFORMATION DANS LES SEDIMENTS R. CABRIDENC

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    avec lequel ils echangent en permanence de nombreuses substances minerales ou organiques ; ainsi que possibilites d'adsorption sur des particules minerales ou organiques ou sur des organismes planctoniques minerales ou organiques qui pour les raisons precedemment citees vont decanter au fond des milieux

  14. architecture les etapes: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    architecture les etapes First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 LA REVUE DE L'EPI N 96 LINUX ET...

  15. Les chelles temporelles des oasis du Jrid tunisien Vincent Battesti

    E-Print Network [OSTI]

    1 Les échelles temporelles des oasis du Jérid tunisien Vincent Battesti Anthropos 95, sept. 2000 analysis and local discourse offer a different image, namely that of an unchanging oasis and of the past which people ascribe to, must also be taken into account. The "crisis" of oasis agriculture, a term

  16. Les granites varisques du Massif Armoricain Ramon Capdevila

    E-Print Network [OSTI]

    Boyer, Edmond

    1 Les granites varisques du Massif Armoricain Ramon Capdevila Géosciences Rennes - Adresse actuelle granites à biotite et hornblende, de composition orogénique, issue de la fusion d'un manteau enrichi par la faveur de roches basiques mantelliques contaminées et de granites crustaux I-type hybridisés avec du

  17. Les pratiques pdagogiques exemplaires en sciences de l'information

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Les pratiques pédagogiques exemplaires en sciences de l'information : 21 fiches annotées Projet d Éric Leroux, professeur adjoint École de bibliothéconomie et des sciences de l'information Université................................................................................................................................... 4 Critères pour l'inventaire des pratiques pédagogiques exemplaires en sciences de l'information

  18. L'Amrique latine ou les Amriques latines Georges Couffignal

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    , le Suriname, la Guyane, la Jamaïque, la Guadeloupe, la Martinique et les mini �tats de la Caraïbe. Au pays andins, populations parfois presque exclusivement d'origine européenne et populations métisses ou

  19. Les dbuts du moteur Diesel en France Nouveaux lments historiques

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Les débuts du moteur Diesel en France Nouveaux éléments historiques par Jean-Michel Althuser 1 et Paul-Antoine Naegel 2 Résumé : Après la biographie de Rudolf DIESEL par son fils Eugen, parue dans sa première édition à Hambourg en 1937, après un dossier spécial consacré à DIESEL en 1966 par la revue

  20. LES SYSTEMES DE MESURE DE PERFORMANCE EN COLLECTIVITES

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    (NPM). Cela s'est principalement traduit par une transition vers des modes de gestion axés sur les, 2000). La généralisation des principes du NPM au sein des pays de l'OCDE a été étudiée selon plusieurs

  1. HABILITATION A DIRIGER LES RECHERCHES UNIVERSITE DE NICE SOPHIA ANTIPOLIS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    HABILITATION A DIRIGER LES RECHERCHES UNIVERSITE DE NICE SOPHIA ANTIPOLIS ECOLE DOCTORALE STIC CARACTERISATION ASSOCIEES présentée et soutenue publiquement par Cyril LUXEY à Sophia-Antipolis le 21 Novembre Examinateur Gilles Jacquemod, Professeur, Université de Nice-Sophia Antipolis Examinateur Christian Pichot

  2. TUDE DES PHOTODSINTGRATIONS. , II. QUELQUES RSULTATS EXPRIMENTAUX SUR LES PHOTODSINTGRATIONS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    était inférieur à ceux observés, en général, par Hirzel et Wâffler. Toms, Halpern et Stephens [5], [6 les iso- topes du magnésium, dont certaines conduisent à des nuclides stables. Byerly et Stephens [7

  3. Contribution l'histoire d'un lieu commun : l'attribution Chateaubriand de la phrase les forts prcdent les peuples, les dserts les suivent . Un exemple d'utilisation du

    E-Print Network [OSTI]

    Boyer, Edmond

    Page 1/11 Contribution à l'histoire d'un lieu commun : l'attribution à Chateaubriand de la phrase biodiversité sous l'impact des activités humaines. Mais comme les autres utilisateurs de cette citation, il ne citation par Huxley, qui, on le sait, a exercé une grande influence sur la contre-culture des années 1960

  4. LE CONTROLE DE GESTION DANS LES FUSIONS-ACQUISITIONS

    E-Print Network [OSTI]

    Boyer, Edmond

    1 LE CONTROLE DE GESTION DANS LES FUSIONS-ACQUISITIONS INTERNATIONALES : UN OUTIL D'INTEGRATION ? Ludivine Chalençon Doctorante en Sciences de Gestion (titulaire d'un contrat doctoral) Centre de recherche contrôle de gestion peut constituer un pivot pouvant freiner mais également aider la réunion des entités

  5. Revue Franaise de Gestion Dossier : Les entrepreneurs seniors

    E-Print Network [OSTI]

    Boyer, Edmond

    1 Revue Française de Gestion Dossier : « Les entrepreneurs seniors » Titre : Handicap à la statistiques SINE ainsi que deux cas de seniors entrepreneurs. Un cadre d'analyse est proposé qui montre Française de Gestion 38, 227 (2012) 111-125" #12;2 Handicap à la nouveauté et senior : la nouveauté de l

  6. Contrle du comportement ingestif et mrycique par les neuropeptides

    E-Print Network [OSTI]

    Boyer, Edmond

    Contrôle du comportement ingestif et mérycique par les neuropeptides L. BUÉNO, P. RIVIÈRE Station. Neuropeptidergic control of feeding behavior and rumination in sheep. In sheep as in other species. Introduction. L'hypothèse de l'existence d'une régulation centrale neuropeptidergique de l'appétit est récente

  7. LES of a Hydrogen-Enriched Lean Turbulent Premixed Flame

    E-Print Network [OSTI]

    Groth, Clinton P. T.

    LES of a Hydrogen-Enriched Lean Turbulent Premixed Flame Francisco E. Hern´andez-P´erez , Clinton the observed behaviour is examined. Hydrogen-hydrocarbon fuel blends appear to be a promising option to synergistically pave the way toward pure hydrogen-based combustion systems while alleviating green-house gas

  8. Note LPSC 06-114 (RACCAM) Zgoubi et les FFAGs

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Note LPSC 06-114 (RACCAM) Zgoubi et les FFAGs F. Lemuet F. M´eot Service Acc´el´erateurs 1 #12 code utilis´e, ZGOUBI, est d´ecrite par ailleurs [3], rappelons simplement ici qu'il est n´ecessaire de

  9. Spécification pour les stratifiés industriels rigides en planches à base de résines thermodurcissables à usage électriques partie 3: spécifications pour matériaux particuliers : feuille 7: prescriptions pour les stratifiés rigides en planches à base de résine polyimide

    E-Print Network [OSTI]

    Association Française de Normalisation. Paris

    1995-01-01T23:59:59.000Z

    Spécification pour les stratifiés industriels rigides en planches à base de résines thermodurcissables à usage électriques

  10. les jabots des abeilles taient beaucoup plus remplis et la dissection et l'analyse ont t

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    . Pollution des miels par des hydrocarbures aromatiques polycycliques dans la région d'Altenburg Entre 1917 et- cipaux de polluants : i) les hydrocarbures aromatiques simples; ii) les hydrocarbures aliphatiques ; iii) les hydrocarbures aroma- tiques polycycliques (HAP) ; iv) les phé- nols. La contamination des miels de

  11. Intercomparison of cloud model simulations of Arctic mixed-phase boundary layer clouds observed during SHEBA/FIRE-ACE

    SciTech Connect (OSTI)

    Morrison, H.; Zuidema, Paquita; Ackerman, Andrew; Avramov, Alexander; de Boer, Gijs; Fan, Jiwen; Fridlind, Ann; Hashino, Tempei; Harrington, Jerry Y.; Luo, Yali; Ovchinnikov, Mikhail; Shipway, Ben

    2011-06-16T23:59:59.000Z

    An intercomparison of six cloud-resolving and large-eddy simulation models is presented. This case study is based on observations of a persistent mixed-phase boundary layer cloud gathered on 7 May, 1998 from the Surface Heat Budget of Arctic Ocean (SHEBA) and First ISCCP Regional Experiment - Arctic Cloud Experiment (FIRE-ACE). Ice nucleation is constrained in the simulations in a way that holds the ice crystal concentration approximately fixed, with two sets of sensitivity runs in addition to the baseline simulations utilizing different specified ice nucleus (IN) concentrations. All of the baseline and sensitivity simulations group into two distinct quasi-steady states associated with either persistent mixed-phase clouds or all-ice clouds after the first few hours of integration, implying the existence of multiple equilibria. These two states are associated with distinctly different microphysical, thermodynamic, and radiative characteristics. Most but not all of the models produce a persistent mixed-phase cloud qualitatively similar to observations using the baseline IN/crystal concentration, while small increases in the IN/crystal concentration generally lead to rapid glaciation and conversion to the all-ice state. Budget analysis indicates that larger ice deposition rates associated with increased IN/crystal concentrations have a limited direct impact on dissipation of liquid in these simulations. However, the impact of increased ice deposition is greatly enhanced by several interaction pathways that lead to an increased surface precipitation flux, weaker cloud top radiative cooling and cloud dynamics, and reduced vertical mixing, promoting rapid glaciation of the mixed-phase cloud for deposition rates in the cloud layer greater than about 1-2x10-5 g kg-1 s-1. These results indicate the critical importance of precipitation-radiative-dynamical interactions in simulating cloud phase, which have been neglected in previous fixed-dynamical parcel studies of the cloud phase parameter space. Large sensitivity to the IN/crystal concentration also suggests the need for improved understanding of ice nucleation and its parameterization in models.

  12. Des quipements mutualiss Les systmes d'information

    E-Print Network [OSTI]

    modernisation de la flotte. La rénovation et l'agrandissement du pavillon d'accueil du centre IRD d'Île-de-France représentent l'essentiel de l'investissement en grands travaux. \\Un pavillon d'accueil au centre IRD Île-de-France Pour renforcer les capacités de recherche des pays du Sud, l'IRD accueille au centre Île-de-France une

  13. Habitat et dveloppement durable LES PERSPECTIVES OFFERTES PAR LE SOLAIRE

    E-Print Network [OSTI]

    Boyer, Edmond

    'Etudes de la Pollution Atmosphérique CEA : Commissariat à l'Energie Atomique EDF : Electricité de France GDF responsables des ministères chargés de l'Environnement, de l'Industrie, de la recherche, du Plan et du logement Construction. Emissions de particules ETUDE PROSPECTIVE SUR LES �MISSIONS DE PARTICULES PRIMAIRES EN FRANCE � L

  14. Myriam Catusse Les rinventions du social dans le Maroc

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Myriam Catusse Les réinventions du social dans le Maroc "ajusté" Revue des mondes musulmans et de of depoliticization. Résumé : Le Maroc de l'ajustement structurel et de la libéralisation économique est le théâtre d, publiait un article intitulé «La trajectoire du Maroc indépendant : une panne de l'ascenseur social

  15. Segmentation et appariement hierarchiques bases sur les pyramides combinatoires

    E-Print Network [OSTI]

    Brun, Chez Luc

    'objets , reconstruction 3D Probl`eme d'appariement apparier des r´egions inconsistance lors de l'´etape de segmentation probl`eme d'inconsistance un m^eme objet pr´esent dans 2 images peut ^etre cod´e diff´erement dans les^ot´es. cadre ´energetique plusieurs heuristiques de fusions J.H. PRUVOT (GREYC) ICISP - 2008-10-25 6 / 32 #12

  16. Solutionnaire pour les exercices sur les piles 1. Trois dpiler ont gnr des exceptions Pile Vides, donc sept dpiler ont fonctionn.

    E-Print Network [OSTI]

    Hamel, Sylvie

    Solutionnaire pour les exercices sur les piles 1. Trois « dépiler » ont généré des exceptions Pile Vides, donc sept dépiler ont fonctionné. Si on a empilé 25 éléments à la pile et que j'ai dépilé 7 de ces éléments, alors il me reste 25-7 = 18 éléments dans la pile. => taille courante = 18 2. Voici la

  17. air-breathing missile configurations: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    recurrence satisfied by the Stirling numbers of the second kind. Abrams, Aaron; Hower, Valerie 2010-01-01 99 Large-eddy Simulation of NASA LaRC Coaxial He-O2Air Jet. Open...

  18. CURRICULUM VITAE CHARLES MENEVEAU

    E-Print Network [OSTI]

    Meneveau, Charles

    , "Large Eddy Simulation study of scalar transport in fully developed wind-turbine array boundary layers" (2011), Phys. Fluids (submitted). 3) K. Bai, C. Meneveau & J. Katz, "Near-wake turbulent flow structure

  19. Energy- and flux-budget (EFB) turbulence closure model for the stably stratified flows. Part I: Steady-state, homogeneous regimes

    E-Print Network [OSTI]

    S. S. Zilitinkevich; T. Elperin; N. Kleeorin; I. Rogachevskii

    2007-02-19T23:59:59.000Z

    We propose a new turbulence closure model based on the budget equations for the key second moments: turbulent kinetic and potential energies: TKE and TPE (comprising the turbulent total energy: TTE = TKE + TPE) and vertical turbulent fluxes of momentum and buoyancy (proportional to potential temperature). Besides the concept of TTE, we take into account the non-gradient correction to the traditional buoyancy flux formulation. The proposed model grants the existence of turbulence at any gradient Richardson number, Ri. Instead of its critical value separating - as usually assumed - the turbulent and the laminar regimes, it reveals a transition interval, 0.11. Predictions from this model are consistent with available data from atmospheric and lab experiments, direct numerical simulation (DNS) and large-eddy simulation (LES).

  20. LES Simulations of Roll Clouds Observed During Mixed- Phase Arctic Cloud Experiment

    SciTech Connect (OSTI)

    Greenberg, S.D.; Harrington, J.Y.; Prenni, A.; DeMott, P.

    2005-03-18T23:59:59.000Z

    Roll clouds, and associated roll convection, are fairly common features of the atmospheric boundary layer. While these organized cumuliform clouds are found over many regions of the planet, they are quite ubiquitous near the edge of the polar ice sheets. In particular, during periods of off-ice flow, when cold polar air flows from the ice pack over the relatively warm ocean water, strong boundary layer convection develops along with frequent rolls. According to Bruemmer and Pohlman (2000), most of the total cloud cover in the Arctic is due to roll clouds. In an effort to examine the influences of mixed-phase microphysics on the boundary layer evolution of roll clouds during off-ice flow, Olsson and Harrington (2000) used a 2D mesoscale model coupled to a bulk microphysical scheme (see Section 2). Their results showed that mixed-phase clouds produced more shallow boundary layers with weaker turbulence than liquid-phase cases. Furthermore, their results showed that because of th e reduced turbulent drag on the atmosphere in the mixed-phase case, regions of mesoscale divergence in the marginal ice-zone were significantly affected. A follow-up 2D study (Harrington and Olsson 2001) showed that the reduced turbulent intensity in mixed-phase cases was due to precipitation. Ice precipitation caused downdraft stabilization which fed back and caused a reduction in the surface heat fluxes. In this work, we extend the work of Olsson and Harrington (2000) and Harrington and Olsson (2001) by examining the impacts of ice microphysics on roll convection. We will present results that illustrate how microphysics alters roll cloud structure and dynamics.

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

    E-Print Network [OSTI]

    Boyer, Edmond

    (Vg1, Vg2) à faible tension de drain. Les caractéristiques Id(Vg2) simulées sont comparées aux and hole densities, as a function of the applied front (Vg1) and back (Vg2) gate voltages. We also deduce the Id(Vg1, Vg2) characteristics in the case of low drain voltage. The simulated Id(Vg2) characteristics

  2. Introduction. On s'intresse ici la simulation numrique de la rcupration des hydrocarbures

    E-Print Network [OSTI]

    Herbin, Raphaèle

    Introduction. On s'intéresse ici à la simulation numérique de la récupération des hydrocarbures phases : « eau », « hydrocarbures sous forme liquide » et « hydrocarbures sous forme gaz ». Pour simplifier, nous allons seulement considérer les phases « eau » et « hydrocarbures sous forme liquide ». De

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

    E-Print Network [OSTI]

    Peinke, Joachim

    REpower 6M wind turbines with rotor blades of different designs installed in the Ellhöft/Westre wind farm developed by the wind turbine manufacturer. Work plan 2011 2012 Task 11 12 01 02 03 04 05 06 07 08 09 10 Figure 1: Simulation of lidar measurements in the wake of a wind turbine using a LES generated wind field

  4. Numerical simulation and sensitivity study of a severe hailstorm in northeast Spain

    E-Print Network [OSTI]

    Romero, Romu

    Numerical simulation and sensitivity study of a severe hailstorm in northeast Spain E. García Atmósfera, Instituto de Medio Ambiente, Universidad de León, 24071 León, Spain b Grup de Meteorologia, Departament de Física, Universitat de les Illes Balears, Palma de Mallorca, Spain Accepted 8 August 2005

  5. Multi-scale thermalhydraulic analyses performed in Nuresim and Nurisp projects

    SciTech Connect (OSTI)

    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

    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)

  6. VIRTIS for Doc: ROS-LES-RP-XXX Title: VIRTIS-H Calibration

    E-Print Network [OSTI]

    Demoulin, Pascal

    VIRTIS for Doc: ROS-LES-RP-XXX Title: VIRTIS-H Calibration Author: JM REESS / F. HENRY Date: 13: ROS-LES-RP-XXX Title: VIRTIS-H Calibration Author: JM REESS / F. HENRY Date: 13/06/2013 Issue: 1 Reason of the modification 1.0 13/06/13 JMR First Issue #12;VIRTIS for Doc: ROS-LES-RP-XXX Title: VIRTIS

  7. La pollution marine est gnralement provoque par les eaux uses, d'origines

    E-Print Network [OSTI]

    AneeseTotahJr/Dreamstime.com Hydrocarbures Bien que spectaculaires, les accidents maritimes n'expliquent que 5% des rejets d'hydrocarbures

  8. avant-arriere dans les: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Information Sciences Websites Summary: 'utilisation de la fracturation hydraulique (fracking ou hydraulic fracturing dans les mondes anglophones) ont de provoquer et...

  9. Les fourmis sont des carri6ristes -Sciences et Avenir SaA BOutique

    E-Print Network [OSTI]

    Alvarez, Nadir

    'rirrute eui pr*lddei {Vid+o ce iliani*lie l.4er.sch ei rlssa,':drrs Crcspi) Les chercheurs ont ainsi constat6

  10. LA SAISON COMME TEMPS SOCIAL : LA PRISE EN COMPTE DE LA SAISONNALITE DANS LES POLITIQUES TEMPORELLES

    E-Print Network [OSTI]

    Boyer, Edmond

    bilans ayant été dressés (Boulin, 2008 ; Mallet, 2011). Néanmoins, tout autant que les politiques d

  11. LES' URENCO-USA Facility | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the.pdfBreaking ofOil & Gas » MethaneJohnsonKristina Pflanz About UsT8LES' URENCO-USA

  12. RACORO continental boundary layer cloud investigations. Part I: Case study development and ensemble large-scale forcings

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Vogelmann, Andrew M.; Fridlind, Ann M.; Toto, Tami; Endo, Satoshi; Lin, Wuyin; Wang, Jian; Feng, Sha; Zhang, Yunyan; Turner, David D.; Liu, Yangang; et al

    2015-05-01T23:59:59.000Z

    Observation-based modeling case studies of continental boundary layer clouds have been developed to study cloudy boundary layers, aerosol influences upon them, and their representation in cloud- and global-scale models. Three 60-hour case study periods span the temporal evolution of cumulus, stratiform, and drizzling boundary layer cloud systems, representing mixed and transitional states rather than idealized or canonical cases. Based on in-situ measurements from the RACORO field campaign and remote-sensing observations, the cases are designed with a modular configuration to simplify use in large-eddy simulations (LES) and single-column models. Aircraft measurements of aerosol number size distribution are fit to lognormal functionsmore »for concise representation in models. Values of the aerosol hygroscopicity parameter, ?, are derived from observations to be ~0.10, which are lower than the 0.3 typical over continents and suggestive of a large aerosol organic fraction. Ensemble large-scale forcing datasets are derived from the ARM variational analysis, ECMWF forecasts, and a multi-scale data assimilation system. The forcings are assessed through comparison of measured bulk atmospheric and cloud properties to those computed in 'trial' large-eddy simulations, where more efficient run times are enabled through modest reductions in grid resolution and domain size compared to the full-sized LES grid. Simulations capture many of the general features observed, but the state-of-the-art forcings were limited at representing details of cloud onset, and tight gradients and high-resolution transients of importance. Methods for improving the initial conditions and forcings are discussed. The cases developed are available to the general modeling community for studying continental boundary clouds.« less

  13. Il fait couvre-feu Cela fait 30 jours aujourd'hui, un mois exactement que les soldats israliens sont rentrs, pour

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    « Il fait couvre-feu » Cela fait 30 jours aujourd'hui, un mois exactement que les soldats de l'occupation, les soldats l'annonçaient depuis les hauts-parleurs des jeeps militaires qui font

  14. LES BALKANS ET L'EUROPE : PROGRES ET MALENTENDUS Jacques Rupnik*

    E-Print Network [OSTI]

    Boyer, Edmond

    LES BALKANS ET L'EUROPE : PROGRES ET MALENTENDUS Jacques Rupnik* Il y a deux façons de présenter l'état des relations entre l'UE et les pays des Balkans engagés dans le processus d'intégration européenne la Croatie en haut de la liste, le pays des Balkans occidentaux le plus avancé et dont l'adhésion est

  15. EXPOS ET MISE AU POINT BIBLIOGRAPHIQUE LA FORMATION DES PARTICULES DE CARBONE DANS LES FLAMMES

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    graphitique du carbone-suie confirmait leur hypothèse selon laquelle les particules se forment à partir d'hydrocarbures réalise le cracking des hydrocarbures dans un tube chauffé, les parois du tube se recouvrent d Fisher, est la pyrolyse du méthane et des hydrocarbures. Pui

  16. SUR LES SPECTRES DE L'HYDROGNE (1) ; Par M. A. DUFOUR.

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    constituent le second spectre de l'hydrogène ; d'après les uns il est du aux hydrocarbures, d'après les autres donc attribuer le second spectre de l'hydrogène à des hydrocarbures. On pourrait encore l'attribuer à l

  17. de 80 chantillons. Les drivs d'hydrocar-bures (HC) ont domin par rapport la frac-

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    'au 28ej, plus particulièrement des hydrocarbures. Les méthyl-alcanes diminuent significativement du 1er abeilles âgées. L'analyse multivariée en grappe de 36 hydrocarbures entre C19et C37 a montré les grappes diminutions nettes de certains hydrocarbures en fonction de l'âge. Des tests biologiques devront montrer si

  18. Varits abliennes sur les corps finis: thorme de Tate et classification de Honda-Tate

    E-Print Network [OSTI]

    Wittenberg, Olivier

    Variétés abéliennes sur les corps finis: théorème de Tate et classification de Honda-Tate Olivier Wittenberg 5 décembre 2001 Résumé Le but de cet exposé est de montrer (suivant Tate et Honda) que les classes polynôme minimal sur Q. Le théorème que l'on se propose de démontrer est le suivant. Théorème 1.0.2 (Honda

  19. PALM / LES seminar RIAM 2009 PALM Using topography (II) Contents Using topography (II)

    E-Print Network [OSTI]

    Raasch, Siegfried

    PALM / LES seminar ­ RIAM 2009 PALM ­ Using topography (II) 1 Contents ­ Using topography (II of good practise · Exercise ­ Questions ­ Hints #12;PALM / LES seminar ­ RIAM 2009 PALM ­ Using topography constant bulk velocity initializing_actions = 'set_constant_profiles', ug_surface = 1.0, vg_surface = 0

  20. LES SPECTRES L D'MISSION ET D'ABSORPTION DU THORIUM ET SES NIVEAUX CARACTRISTIQUES

    E-Print Network [OSTI]

    Boyer, Edmond

    LES SPECTRES L D'ÉMISSION ET D'ABSORPTION DU THORIUM ET SES NIVEAUX CARACTÉRISTIQUES Par YVETTE étude précise d'ensemble sur le spectre d'émission L du thorium comprenant la mesure de toutes les raies niveaux du thorium qui prennent part aux émissions X normales. Ces valeurs qui diffèrent sensiblement de

  1. A Unified RANS-LES Model: Computational Development, Accuracy and Cost1 Harish Gopalana

    E-Print Network [OSTI]

    Heinz, Stefan

    -Stokes (RANS) methods, applies modeling assumptions to all the scales of motion. The17 use of LES methodsA Unified RANS-LES Model: Computational Development, Accuracy and Cost1 Harish Gopalana , Stefan Heinzb, , Michael K. Stöllingera 2 aMechanical Engineering Department, University of Wyoming, 1000 E

  2. Phnomnes de pizoconductivit dans les composites polymre-noir de carbone. Application aux capteurs

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    régulation du trafic routier est envisagé. Abstract. - The electrical conductivity of some carbon black-polymer347 Phénomènes de piézoconductivité dans les composites polymère-noir de carbone. Application aux) Résumé. - Certains composites polymère-noir de carbone ont une conductivité qui varie beaucoup avec les

  3. Concentrations de carbonate de calcium sur les parois des hyphes mycliens

    E-Print Network [OSTI]

    Boyer, Edmond

    Concentrations de carbonate de calcium sur les parois des hyphes mycéliens Gabriel CALLOT, Daniel possibilité de formation de carbonate de calcium sur les parois des filaments mycéliens. Parallèlement à ces, minéralogenèse. SUMMARY Concentration of calcium carbonate on the walls of fungal hyphae. The structure

  4. INFLUENCE DES DFAUTS TENDUS SUR LES PROPRITS SUPRACONDUCTRICES DU NIOBIUM (1)

    E-Print Network [OSTI]

    Boyer, Edmond

    240. INFLUENCE DES DÉFAUTS ÉTENDUS SUR LES PROPRIÉTÉS SUPRACONDUCTRICES DU NIOBIUM (1) Par B. B monocristaux de niobium. La comparaison des mesures d'aimantation avec les prévisions des théories des resistivity measurements, and electron microscope observations were performed with several niobium single

  5. Les dfis de l'valuation conomique du patrimoine urbain des pays en dveloppement

    E-Print Network [OSTI]

    Boyer, Edmond

    Les défis de l'évaluation économique du patrimoine urbain des pays en développement Methods for the economic valuation of urban heritage: a sustainability-based approach L. Dalmas, V. Geronimi, J.-F. Noël, J2013 #12;3 Les défis de l'évaluation économique du patrimoine urbain des pays en développement Methods

  6. La reprsentationdescauses de l'tat de sant par les infirmiers etlespointsde vueenvisagsdespatientset desaidantsnaturels

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    La représentationdescauses de l'état de santé par les infirmiers etlespointsde la représentation d'infirmiers hospitaliers expérimentés (n=44) et les différences de points de vue dans la relation soignant-soigné, nous faisons d'une part l'hypothèse que ces infirmiers exhiberont une

  7. Universit Joseph Fourier Master 2 Recherche -Systmes et Logiciels Gestion de ressources dans les services Internet

    E-Print Network [OSTI]

    Pous, Damien

    Université Joseph Fourier Master 2 Recherche - Systèmes et Logiciels Gestion de ressources dans machines devient donc un réel problème, et on a désormais besoin de solutions de gestion de ressources pour-même suivis de serveurs de base de données. Les approches actuelles de gestion de ressources dans les services

  8. Paris, le 7 aot 2014 Analyse de traces de plutonium dans les rivires ctires de

    E-Print Network [OSTI]

    Pouyanne, Nicolas

    1/2 Paris, le 7 août 2014 Analyse de traces de plutonium dans les rivières côtières de la région de premières mesures précises de l'isotopie du plutonium présent dans les sédiments radioactifs charriés par d'importantes émissions de radionucléides dans l'environnement et du plutonium (Pu) à l'état de

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

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    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

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

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    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 Méditerranée occidentale. Introduction Koper, Trieste et Rijeka envoient des signaux contrastés qui balancent

  11. Impact of subgrid-scale radiative heating variability on the stratocumulus-to-trade cumulus transition in climate models

    SciTech Connect (OSTI)

    Xiao, Heng; Gustafson, William I.; Wang, Hailong

    2014-04-29T23:59:59.000Z

    Subgrid-scale interactions between turbulence and radiation are potentially important for accurately reproducing marine low clouds in climate models. To better understand the impact of these interactions, the Weather Research and Forecasting (WRF) model is configured for large eddy simulation (LES) to study the stratocumulus-to-trade cumulus (Sc-to-Cu) transition. Using the GEWEX Atmospheric System Studies (GASS) composite Lagrangian transition case and the Atlantic Trade Wind Experiment (ATEX) case, it is shown that the lack of subgrid-scale turbulence-radiation interaction, as is the case in current generation climate models, accelerates the Sc-to-Cu transition. Our analysis suggests that in cloud-topped boundary layers subgrid-scale turbulence-radiation interactions contribute to stronger production of temperature variance, which in turn leads to stronger buoyancy production of turbulent kinetic energy and helps to maintain the Sc cover.

  12. Analysis of turbulent transport and mixing in transitional Rayleigh/Taylor unstable flow using direct numerical simulation data

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Schilling, Oleg; Mueschke, Nicholas J.

    2010-01-01T23:59:59.000Z

    Data from a 1152X760X1280 direct numerical simulation (DNS) of a transitional Rayleigh-Taylor mixing layer modeled after a small Atwood number water channel experiment is used to comprehensively investigate the structure of mean and turbulent transport and mixing. The simulation had physical parameters and initial conditions approximating those in the experiment. The budgets of the mean vertical momentum, heavy-fluid mass fraction, turbulent kinetic energy, turbulent kinetic energy dissipation rate, heavy-fluid mass fraction variance, and heavy-fluid mass fraction variance dissipation rate equations are constructed using Reynolds averaging applied to the DNS data. The relative importance of mean and turbulent production, turbulent dissipationmore »and destruction, and turbulent transport are investigated as a function of Reynolds number and across the mixing layer to provide insight into the flow dynamics not presently available from experiments. The analysis of the budgets supports the assumption for small Atwood number, Rayleigh/Taylor driven flows that the principal transport mechanisms are buoyancy production, turbulent production, turbulent dissipation, and turbulent diffusion (shear and mean field production are negligible). As the Reynolds number increases, the turbulent production in the turbulent kinetic energy dissipation rate equation becomes the dominant production term, while the buoyancy production plateaus. Distinctions between momentum and scalar transport are also noted, where the turbulent kinetic energy and its dissipation rate both grow in time and are peaked near the center plane of the mixing layer, while the heavy-fluid mass fraction variance and its dissipation rate initially grow and then begin to decrease as mixing progresses and reduces density fluctuations. All terms in the transport equations generally grow or decay, with no qualitative change in their profile, except for the pressure flux contribution to the total turbulent kinetic energy flux, which changes sign early in time (a countergradient effect). The production-to-dissipation ratios corresponding to the turbulent kinetic energy and heavy-fluid mass fraction variance are large and vary strongly at small evolution times, decrease with time, and nearly asymptote as the flow enters a self-similar regime. The late-time turbulent kinetic energy production-to-dissipation ratio is larger than observed in shear-driven turbulent flows. The order of magnitude estimates of the terms in the transport equations are shown to be consistent with the DNS at late-time, and also confirms both the dominant terms and their evolutionary behavior. These results are useful for identifying the dynamically important terms requiring closure, and assessing the accuracy of the predictions of Reynolds-averaged Navier-Stokes and large-eddy simulation models of turbulent transport and mixing in transitional Rayleigh-Taylor instability-generated flow.« less

  13. Analysis of turbulent transport and mixing in transitional Rayleigh/Taylor unstable flow using direct numerical simulation data

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Schilling, Oleg [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Mueschke, Nicholas J. [Texas A and M Univ., College Station, TX (United States)

    2010-01-01T23:59:59.000Z

    Data from a 1152X760X1280 direct numerical simulation (DNS) of a transitional Rayleigh-Taylor mixing layer modeled after a small Atwood number water channel experiment is used to comprehensively investigate the structure of mean and turbulent transport and mixing. The simulation had physical parameters and initial conditions approximating those in the experiment. The budgets of the mean vertical momentum, heavy-fluid mass fraction, turbulent kinetic energy, turbulent kinetic energy dissipation rate, heavy-fluid mass fraction variance, and heavy-fluid mass fraction variance dissipation rate equations are constructed using Reynolds averaging applied to the DNS data. The relative importance of mean and turbulent production, turbulent dissipation and destruction, and turbulent transport are investigated as a function of Reynolds number and across the mixing layer to provide insight into the flow dynamics not presently available from experiments. The analysis of the budgets supports the assumption for small Atwood number, Rayleigh/Taylor driven flows that the principal transport mechanisms are buoyancy production, turbulent production, turbulent dissipation, and turbulent diffusion (shear and mean field production are negligible). As the Reynolds number increases, the turbulent production in the turbulent kinetic energy dissipation rate equation becomes the dominant production term, while the buoyancy production plateaus. Distinctions between momentum and scalar transport are also noted, where the turbulent kinetic energy and its dissipation rate both grow in time and are peaked near the center plane of the mixing layer, while the heavy-fluid mass fraction variance and its dissipation rate initially grow and then begin to decrease as mixing progresses and reduces density fluctuations. All terms in the transport equations generally grow or decay, with no qualitative change in their profile, except for the pressure flux contribution to the total turbulent kinetic energy flux, which changes sign early in time (a countergradient effect). The production-to-dissipation ratios corresponding to the turbulent kinetic energy and heavy-fluid mass fraction variance are large and vary strongly at small evolution times, decrease with time, and nearly asymptote as the flow enters a self-similar regime. The late-time turbulent kinetic energy production-to-dissipation ratio is larger than observed in shear-driven turbulent flows. The order of magnitude estimates of the terms in the transport equations are shown to be consistent with the DNS at late-time, and also confirms both the dominant terms and their evolutionary behavior. These results are useful for identifying the dynamically important terms requiring closure, and assessing the accuracy of the predictions of Reynolds-averaged Navier-Stokes and large-eddy simulation models of turbulent transport and mixing in transitional Rayleigh-Taylor instability-generated flow.

  14. Spécifications de la qualité technique de l'hexafluorure de soufre (SF6) pour utilisation dans les appareils électriques

    E-Print Network [OSTI]

    International Electrotechnical Commission. Geneva

    2005-01-01T23:59:59.000Z

    Spécifications de la qualité technique de l'hexafluorure de soufre (SF6) pour utilisation dans les appareils électriques

  15. 1re Confrence Franco-Syrienne sur les nergies renouvelables Damas, 24-28 Octobre 2010 CFSER 2010 Page 1

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ) - Les turbines à axe vertical (VAWTs) . Fig. 1 VAWT Chinoise (F.H. KING [2004]) L'origine connue des

  16. PECO: l'euro s'loigne Aprs un lger ralentissement en 2005, les Nouveaux pays membres

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    PECO: l'euro s'éloigne Après un léger ralentissement en 2005, les Nouveaux pays membres (NPM) * ont restée très soutenue en 2006 dans tous les NPM, dont les indicateurs conjoncturels affichent tous des'oeuvre dans la plupart des NPM, qui ont ainsi vu les revenus augmenter en 2006. Ces hausses de revenus

  17. LISTE DES TITRES QUE SAIS-JE ET REPERES (PLATEFORME CAIRN) SEPTEMBRE 2012 -Les 100 dates de la culture gnrale

    E-Print Network [OSTI]

    Dojat, Michel

    'indépendance - L'aide sociale en France - Albigeois et Cathares - L'alchimie - Alexandre le Grand - Les algorithmes

  18. Caracteristiques et determination de la matiere organique dans les mchefers d'incineration d'ordures menageres (MIOM)

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    2001-80 Caracteristiques et determination de la matiere organique dans les mächefers d'incineration matiere organique dans les Residus de Procedes Thermiques dont les Mächefers d'incineration d, bois...). Bien que l'efficacite de combustion des equipements collectifs d'incineration ne cesse de

  19. Highly turbulent solutions of LANS-alpha and their LES potential

    E-Print Network [OSTI]

    J. Pietarila Graham; Darryl Holm; Pablo Mininni; Annick Pouquet

    2007-10-22T23:59:59.000Z

    We compute solutions of the Lagrangian-Averaged Navier-Stokes alpha-model (LANS) for significantly higher Reynolds numbers (up to Re 8300) than have previously been accomplished. This allows sufficient separation of scales to observe a Navier-Stokes (NS) inertial range followed by a 2nd LANS inertial range. The analysis of the third-order structure function scaling supports the predicted l^3 scaling; it corresponds to a k^(-1) scaling of the energy spectrum. The energy spectrum itself shows a different scaling which goes as k^1. This latter spectrum is consistent with the absence of stretching in the sub-filter scales due to the Taylor frozen-in hypothesis employed as a closure in the derivation of LANS. These two scalings are conjectured to coexist in different spatial portions of the flow. The l^3 (E(k) k^(-1)) scaling is subdominant to k^1 in the energy spectrum, but the l^3 scaling is responsible for the direct energy cascade, as no cascade can result from motions with no internal degrees of freedom. We verify the prediction for the size of the LANS attractor resulting from this scaling. From this, we give a methodology either for arriving at grid-independent solutions for LANS, or for obtaining a formulation of a LES optimal in the context of the alpha models. The fully converged grid-independent LANS may not be the best approximation to a direct numerical simulation of the NS equations since the minimum error is a balance between truncation errors and the approximation error due to using LANS instead of the primitive equations. Furthermore, the small-scale behavior of LANS contributes to a reduction of flux at constant energy, leading to a shallower energy spectrum for large alpha. These small-scale features, do not preclude LANS to reproduce correctly the intermittency properties of high Re flow.

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

    E-Print Network [OSTI]

    Boyer, Edmond

    combustion instabilities in annular gas turbine combustors. Keywords Combustion instabilities · Large Eddy Using LES to Study Reacting Flows and Instabilities in Annular Combustion Chambers. (2012) Flow, Turbulence and Combustion, vol. 88 (n° 1-2). pp. 191-206. ISSN 1386-6184 Any correspondence concerning

  1. V European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010

    E-Print Network [OSTI]

    Nicoud, Franck

    for the optimisation of the energy consumption (heating or cooling); it is then necessary to develop accurate LES. Sequeira (Eds) Lisbon, Portugal,14-17 June 2010 IS THE DYNAMIC PROCEDURE APPROPRIATE FOR ALL SGS MODELS ? H, Subgrid- scale model Abstract. The rapid growth of supercomputers will probably make the use of Large eddy

  2. CGILS: Results from the First Phase of an International Project to Understand the Physical Mechanisms of Low Cloud Feedbacks in Single Column Models

    SciTech Connect (OSTI)

    Zhang, Minghua; Bretherton, Christopher S.; Blossey, Peter; Austin, Phillip A.; Bacmeister, J.; Bony, Sandrine; Brient, Florent; Cheedela, Suvarchal K.; Cheng, Anning; Del Genio, Anthony D.; De Roode, Stephan R.; Endo , Satoshi; Franklin, Charmaine N.; Golaz, Jean-Christophe; Hannay, Cecile; Heus, Thijs; Isotta, Francesco A.; Jean-Louis, Dufresne; Kang, In-Sik; Kawai, Hideaki; Koehler, M.; Larson, Vincent E.; Liu, Yangang; Lock, Adrian; Lohmann, U.; Khairoutdinov, Marat; Molod, Andrea M.; Neggers, Roel; Rasch, Philip J.; Sandu, Irina; Senkbeil, Ryan; Siebesma, A. P.; Siegenthaler-Le Drian, Colombe; Stevens, Bjorn; Suarez, Max; Xu, Kuan-Man; Von Salzen, Knut; Webb, Mark; Wolf, Audrey; Zhao, M.

    2013-12-26T23:59:59.000Z

    Large Eddy Models (LES) and Single Column Models (SCM) are used in a surrogate climate change 101 to investigate the physical mechanism of low cloud feedbacks in climate models. Enhanced surface-102 driven boundary layer turbulence and shallow convection in a warmer climate are found to be 103 dominant mechanisms in SCMs.

  3. L'lite sous la mitraille : les mathmaticiens normaliens morts pour la France ,

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    'agrégation interrompu par la mobilisation. Le surlendemain, le soldat Louis Destouches (le futur Céline) écrit à ses.htm. Des renseignements sur les soldats morts pour la France sont disponibles sur le site (http

  4. Les Carnets du paysage N 11, 2004, p. 26-33

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    paysage perçu par un soldat à mesure qu'il se rapproche du front (« Krieglandschaft », Zeitschrift für'environnement physique se modifie dans la perception en relation avec les besoins du soldat, en particulier, lorsqu'il se

  5. Les villes du Golfe sont-elles des villes durables ? Marc Lavergne

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    temporaire, et fondées sur la monoproduction d'hydrocarbures, permet d'envisager la durabilité comme une hydrocarbures : elles sont vouées à une monoactivité qui les fait assimiler parfois aux villes champignons de la

  6. EMF 13 (2009) 31 LES MODES DE FINANCEMENT PUBLIC DES PERFORMANCES AVIGNON

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    2009-01-01T23:59:59.000Z

    hommage tout particulier au Dr Pierre Pansier, ophtalmologue et historien d'Avignon du début du XXe siècle citer un article de Paul Achard sur « Les anciens trésoriers de la ville d'Avignon », un autre de

  7. Prsence du Tobacco Rattle Virus (TRV) dans les cultures d'artichaut en France (1)

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    'inoculation est effectuée en présence de charbon végétal activé et de carborundum 600 mesh (80 mg/ml dans les 2

  8. DIFFUSION QUASI ELASTTOUE SUR DES GROUPEMENTS DE NUCLEONS DANS LES NOYAUX C 156 MeV

    E-Print Network [OSTI]

    Boyer, Edmond

    residual nucleus energy spectra appear to be in agreement with the inter- mediate coupling shell probabilité relative pour 6 3 Li-» t + He est par contre d'un ordre de gran- deur plus petit. Les spectres d

  9. amb Barcelona La UPF traspassa tamb les seves prpies fronteres. s una

    E-Print Network [OSTI]

    Geffner, Hector

    1 El lligam amb Barcelona #12;2 La UPF traspassa també les seves pròpies fronteres. És una contribueix a augmentar-ne la complexitat. #12;4 Cal associar clarament la marca UPF a la ciutat de Barcelona

  10. A restructurable logic simulator

    E-Print Network [OSTI]

    Ledford, Gordon Lee

    1985-01-01T23:59:59.000Z

    , notably logic simulators. This paper reviews the event-driven simulation algorithm used by most software- based simulators and a handful of the existing special-purpose hardware-based logic simulation accelerators. A new hardware-based accelerator... architecture is then presented, that of the restructurab)e logic simulator. This accelerator is based on a, memory-like module. referred to as the restructurable logic simulation accelerator, that essentially "stores" a portion of the network to be simulated...

  11. Algorithmes hybrides pour la gestion intelligente de l'nergie dans les smart grids

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Algorithmes hybrides pour la gestion intelligente de l'énergie dans les smart grids Robin ROCHE1 électrique plus intelligent, dit smart grid. Les travaux présentés dans cet article proposent un système de l'on nomme "smart grid", ou réseau électrique intelligent (Simoes et al., 2011) (voir figure 1

  12. CONCEPTION OPTIMALE DES SYSTEMES INSTRUMENTS DE SECU RIT : UNE APPROCHE PAR LES BLOCS DIAGRAMMES DE FIABILIT

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    par les normes de sécurité IEC 61508 et IEC 61511. L'étude proposée s'inscrit dans le contexte de l conception d'un SIS, utilisé dans le document ISATR84.00.022002 relatif à la norme IEC 61508, qui doit les SIS, deux normes de sécurité sont utilisées : l'IEC 61508 (IEC61508, 1998) et l'IEC 61511 (IEC

  13. LES FERRITES A MMOIRE G. GRUNBERG, H. JEANTILS et H. de SILVESTRE

    E-Print Network [OSTI]

    Boyer, Edmond

    859 LES FERRITES A M�MOIRE G. GRUNBERG, H. JEANTILS et H. de SILVESTRE COFELEC Mémoires, B. P. 203 APPLIQU�E TOME 9, SEPTEMBRE 1974, PAGE L'utilisation de tores de ferrite comme éléments mémoire remonte à ferrite dans les mémoires repose sur l'existence d'un cycle d'hystérésis pratiquement rectangulaire, qui

  14. LA GESTION DE L'EAU PAR LES ASSOCIATIONS DE PROPRITAIRES FONCIERS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    LA GESTION DE L'EAU PAR LES ASSOCIATIONS DE PROPRI�TAIRES FONCIERS Méthodologie pour un, est posée la question du devenir de ces structures et de leur participation à une gestion de l'eau à gestion à long terme de ces structures et de la ressource en eau, notamment par les acteurs locaux grâce à

  15. Deux cent ans de gologie travers les paysages languedociens autour du Pic Saint Loup

    E-Print Network [OSTI]

    Boyer, Edmond

    précurseurs ont d'abord établi la succession stratigraphique des roches, puis ils ont commencé de reporter les garrigues, lardées d'escarpement rocheux et de petites plaines cultivées, caractérisent les paysages strates, tant sous la surface que vers le ciel ; il relèvera aussi la distribution des différentes

  16. LES DETERMINANTS DE L'INEGALITE ET LE ROLE DE L'EQUITE DANS LES PAYS DU MOYEN-ORIENT ET DE L'AFRIQUE DU NORD

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    réduction de la pauvreté. A cet effet, trois relations sont successivement testées : l'hypothèse de Kuznets par Kuznets, il convient donc de favoriser les politiques qui réduisent l'inéquité sociale et mettent relations: the Kuznets' hypothesis, and the pro-poor growth theory. We next investigate the determinants

  17. Les figures acoustiques de Chladni. Figures acoustiques de Chladni Ernst Chladni ( 1756-1827) Figures acoustiques de Chladni 1787

    E-Print Network [OSTI]

    d'Orléans, Université

    Les figures acoustiques de Chladni. Figures acoustiques de Chladni Ernst Chladni ( 1756-1827) Figures acoustiques de Chladni 1787 Comme les cordes vibrantes, les plaques peuvent vibrer à différentes phénomène a été découvert par le physicien E. Chladni. Pour cela il fait vibrer à l'aide d'un archet une

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

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    dioxines/furannes dans les Mächefers d'incineration d'Ordures Menageres valorises en travaux routiers/PCDF) au sein des mächefers d'incineration d'ordures menageres et sur les risques lies ä leur eventuel transfert potentiel vers l'environnement. 2. LES M�CHEFERS D'INCINERATION D'ORDURES MENAGERES L'ensemble de

  19. The second edition of the MISRA C guidelines Les Hatton,

    E-Print Network [OSTI]

    Hatton, Les

    to add to languages. Not so refreshingly, the application area was a nuclear reactor simulation program, CIS, University of Kingston Nine years ago, I finally finished a book entitled "Safer C", (Hatton 1995). The theme of this book was not to promote the use of C in high- integrity and safety critical systems

  20. Vehicle Modeling and Simulation

    Broader source: Energy.gov (indexed) [DOE]

    Vehicle Modeling and Simulation Vehicle Modeling and Simulation Matthew Thornton National Renewable Energy Laboratory matthewthornton@nrel.gov phone: 303.275.4273 Principal...

  1. Web Interface Call Simulator

    E-Print Network [OSTI]

    Ernst, Damien

    Web Interface Call Simulator Stage Description Web Interface for VoIP Call Simulator Net) Version 1.0 ­ 3/09/2012 Page 1 of 6 #12;Web Interface Call Simulator Version 1.0 ­ 3/09/2012 Page 2 of 6 #12;Web Interface Call Simulator Document Control Version Date Notes 1.0 25/8/2012 Reviewed

  2. Implicit and explicit schemes for mass consistency preservation in hybrid particle/finite-volume algorithms for turbulent reactive flows

    SciTech Connect (OSTI)

    Popov, Pavel P., E-mail: ppopov@uci.edu; Pope, Stephen B.

    2014-01-15T23:59:59.000Z

    This work addresses the issue of particle mass consistency in Large Eddy Simulation/Probability Density Function (LES/PDF) methods for turbulent reactive flows. Numerical schemes for the implicit and explicit enforcement of particle mass consistency (PMC) are introduced, and their performance is examined in a representative LES/PDF application, namely the Sandia–Sydney Bluff-Body flame HM1. A new combination of interpolation schemes for velocity and scalar fields is found to better satisfy PMC than multilinear and fourth-order Lagrangian interpolation. A second-order accurate time-stepping scheme for stochastic differential equations (SDE) is found to improve PMC relative to Euler time stepping, which is the first time that a second-order scheme is found to be beneficial, when compared to a first-order scheme, in an LES/PDF application. An explicit corrective velocity scheme for PMC enforcement is introduced, and its parameters optimized to enforce a specified PMC criterion with minimal corrective velocity magnitudes.

  3. 25 ans INSU 3 Dcmbre 2010 J. L. Puget Les premires lumires

    E-Print Network [OSTI]

    van Tiggelen, Bart

    25 ans INSU 3 Décmbre 2010 J. L. Puget Les premières lumières de l'univers et leur detection Jean-Loup Puget Institut d'Astrophysique Spatiale,Orsay #12;25 ans INSU 3 Décmbre 2010 J. L. Puget Le début de la est très vite contredit par les observations #12;25 ans INSU 3 Décmbre 2010 J. L. Puget expansion de l

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

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    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

  5. contre sel et eau De nombreux deltas jalonnent les rivages de la Mditerrane.

    E-Print Network [OSTI]

    plus importants, celui du Nil, du Rhône, du Pô et de l'�bre. Ils subissent naturellement des phénomènes de crue (eau douce ou salée) et d'assèchement sur des périodes plus longues que dans les plaines artificiel Pour cultiver les sols, il a d'abord été nécessaire d'évacuer l'eau saumâtre de ces milieux

  6. Parameterization and Analysis of 3-D Solar Radiative Transfer in Clouds: Final Report

    SciTech Connect (OSTI)

    Jerry Y. Harrington

    2012-09-21T23:59:59.000Z

    This document reports on the research that we have done over the course of our two-year project. The report also covers the research done on this project during a 1 year no-cost extension of the grant. Our work has had two main, inter-related thrusts: The first thrust was to characterize the response of stratocumulus cloud structure and dynamics to systematic changes in cloud infrared radiative cooling and solar heating using one-dimensional radiative transfer models. The second was to couple a three-dimensional (3-D) solar radiative transfer model to the Large Eddy Simulation (LES) model that we use to simulate stratocumulus. The purpose of the studies with 3-D radiative transfer was to examine the possible influences of 3-D photon transport on the structure, evolution, and radiative properties of stratocumulus. While 3-D radiative transport has been examined in static cloud environments, few studies have attempted to examine whether the 3-D nature of radiative absorption and emission influence the structure and evolution of stratocumulus. We undertook this dual approach because only a small number of LES simulations with the 3-D radiative transfer model are possible due to the high computational costs. Consequently, LES simulations with a 1-D radiative transfer solver were used in order to examine the portions of stratocumulus parameter space that may be most sensitive to perturbations in the radiative fields. The goal was then to explore these sensitive regions with LES using full 3-D radiative transfer. Our overall goal was to discover whether 3-D radiative processes alter cloud structure and evolution, and whether this may have any indirect implications for cloud radiative properties. In addition, we collaborated with Dr. Tamas Varni, providing model output fields for his attempt at parameterizing 3-D radiative effects for cloud models.

  7. Subgrid models for mass and thermal diffusion in turbulent mixing

    SciTech Connect (OSTI)

    Sharp, David H [Los Alamos National Laboratory; Lim, Hyunkyung [STONY BROOK UNIV; Li, Xiao - Lin [STONY BROOK UNIV; Gilmm, James G [STONY BROOK UNIV

    2008-01-01T23:59:59.000Z

    We are concerned with the chaotic flow fields of turbulent mixing. Chaotic flow is found in an extreme form in multiply shocked Richtmyer-Meshkov unstable flows. The goal of a converged simulation for this problem is twofold: to obtain converged solutions for macro solution features, such as the trajectories of the principal shock waves, mixing zone edges, and mean densities and velocities within each phase, and also for such micro solution features as the joint probability distributions of the temperature and species concentration. We introduce parameterized subgrid models of mass and thermal diffusion, to define large eddy simulations (LES) that replicate the micro features observed in the direct numerical simulation (DNS). The Schmidt numbers and Prandtl numbers are chosen to represent typical liquid, gas and plasma parameter values. Our main result is to explore the variation of the Schmidt, Prandtl and Reynolds numbers by three orders of magnitude, and the mesh by a factor of 8 per linear dimension (up to 3200 cells per dimension), to allow exploration of both DNS and LES regimes and verification of the simulations for both macro and micro observables. We find mesh convergence for key properties describing the molecular level of mixing, including chemical reaction rates between the distinct fluid species. We find results nearly independent of Reynolds number for Re 300, 6000, 600K . Methodologically, the results are also new. In common with the shock capturing community, we allow and maintain sharp solution gradients, and we enhance these gradients through use of front tracking. In common with the turbulence modeling community, we include subgrid scale models with no adjustable parameters for LES. To the authors' knowledge, these two methodologies have not been previously combined. In contrast to both of these methodologies, our use of Front Tracking, with DNS or LES resolution of the momentum equation at or near the Kolmogorov scale, but without resolving the Batchelor scale, allows a feasible approach to the modeling of high Schmidt number flows.

  8. Appels de fonctions dans les langages 3.1 Fonctions, pile, rcursion, blocs d'activation . . . . . . . . . . . . . . . . . . . . . . 1

    E-Print Network [OSTI]

    Balat, Vincent - Laboratoire Preuves, Programmes et Systèmes, Université Paris 7

    Chapitre 3 Appels de fonctions dans les langages à blocs Sommaire 3.1 Fonctions, pile, récursion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3.1.2 La pile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3, pile, récursion, blocs d'activation 3.1.1 Le problème Les appels de fonctions et la récursion

  9. Traitements de la langue naturelle pour la RI Dans cette section, on discute les deux problmes suivants

    E-Print Network [OSTI]

    Nie, Jian-Yun

    essentiellement effectué dans New Mexico State University (CRL). L'idée est aussi d'exploiter la relation entre un dictionnaire est d'exploiter les informations qui se trouvent dans la définition d'un mot pour déterminer le contexte (sauf les stopwords): coal, fire: Coal: AS black mineral which is dug from the earth, which can

  10. L'auteur a aussi trouv que les pouvoirs inducteurs spcifiques du verre et de la porcelaine diminuent quand ces

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    . PREECE. - On the space protected by a lightning-conductor (Sur l'espace protégé par un paratonnerre état de tension d'autant plus prononcé que les surfaces équipotentielles sont plus rapprochées, ou que lignes les longueurs interceptées descendent au-dessous d'une certaine limite, il se produit une décharge

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

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    NOTE SUR LES EFFETS DE L'INFUSION PERMANENTE D'UN MÉLANGE 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

  12. ENERGIA HIDROEL`ECTRICA Aprofitament de l'energia potencial gravitat`oria de les masses d'aigua

    E-Print Network [OSTI]

    Batiste, Oriol

    del sol. #12;Una quarta part de l'energia solar que incideix sobre la terra es consumeix en lENERGIA HIDROEL`ECTRICA Aprofitament de l'energia potencial gravitat`oria de les masses d molt r`apida. #12;LIMITACIONS I PROBLEMES Podem realment considerar-la una font energia apropiada? Les

  13. Les communauts de pratique des infirmiers et infirmires sur internet : quelles contributions dans la construction de praxologies

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Les communautés de pratique des infirmiers et infirmières sur internet : quelles contributions dans infirmiers ? Quelle est la place des ressources disponibles sur le web et des réseaux sociaux dans les et à la construction identitaire des infirmiers ? Émergence de pratiques d'échanges professionnelles

  14. RoMe, Les RoMAIns et L'ARt gRec Translatio, interpretatio, imitatio, mulatio...

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    cet égard, en particulier celui de Plutarque : Aussi Marcellus fut-il plus apprécié du peuple, pour de tel, après la prise de tarente [...] Ils reprochaient d'abord à Marcellus [...] d'avoir corrompu journée. cependant Marcellus se glorifiait de sa conduite même devant les grecs. «Les Romains, disait

  15. Acceleration of inertial particles in wall bounded flows: DNS and LES with stochastic modelling of the subgrid acceleration

    E-Print Network [OSTI]

    Boyer, Edmond

    environmental systems, from sediment transport to atmospheric dispersion of pollutants or solid depositionAcceleration of inertial particles in wall bounded flows: DNS and LES with stochastic modelling and LES with stochastic modelling of the subgrid acceleration R´emi Zamansky, Ivana Vinkovic, Mikhael

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

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    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

  17. Communication au Colloque Frontires et territoires dans les Balkans. De l'administration des Empires aux logiques des tats, de la fin du XVIIIe

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Communication au Colloque « Frontières et territoires dans les Balkans. De l'administration des'Athènes, 20-22 septembre 2006 Maillages territoriaux et politiques régionales dans les Balkans. Nouveaux défis

  18. International Work Placement Case Study: Les Sol de Portecarrero, Almeria, Lara spent nine months in 2011/2012 as an English teaching assistant in Almeria in Spain

    E-Print Network [OSTI]

    Mumby, Peter J.

    International Work Placement Case Study: Les Sol de Portecarrero, Almeria, Spain Lara spent nine months in 2011/2012 as an English teaching assistant in Almeria in Spain at Les Sol de Portocarrero

  19. 12.3. Fundaci General de la UIB (FuGUIB) La Fundaci General de la Universitat de les Illes Balears (FuGUIB) s una instituci

    E-Print Network [OSTI]

    Oro, Daniel

    Balears (FuGUIB) és una institució privada, amb personalitat jurídica pròpia i sense ànim de lucre. Va ser'ha materialitzat en les accions principals següents: -- Millora en el sistema d'il·luminació de les torres del camp

  20. C. R. Acad. Sc. Paris, t. 279 (14 octobre 1974) Serie D -1393 ETHOLOGIE. -Geophagie et nutrition minerale chez les Primates sauvages.

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    minerale chez les Primates sauvages. Note (*) de MM. Claude Marcel Hladik et Leon Guegnen, transmise par M

  1. le cas de l'isopentane que dans le cas de l'acide carbonique, et cela tient surtout la mthode qui a servi les obtenir, mthode insuf-

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    que l'on puisse même obtenir les harmoniques, qui imposent lenr période au son de biseau plus aigu ou

  2. reconnat aisment qu'il faut introduire les tei-mes du 2e degr en ( long.) et ( lat.) et adopter une formule 2 tern~ies.

    E-Print Network [OSTI]

    Boyer, Edmond

    'un magnétomètre. Je pouvais ainsi étudier, d'une part, l'aimantation acquise par les dépôts pendant lenr formation

  3. DNS and LES of two-phase flows with cavitation

    E-Print Network [OSTI]

    Hickel, Stefan

    2014-01-01T23:59:59.000Z

    We report on recent progress in the physical and numerical modeling of compressible two-phase flows that involve phase transition between the liquid and gaseous state of the fluid. The high-speed dynamics of cavitation bubbles is studied in well-resolved simulations (DNS) with a sharp-interface numerical model on a micro scale. The underlying assumption of the employed evaporation/condensation model is that phase change occurs in thermal non-equilibrium and that the associated timescale is larger than that of the wave dynamics. Results for the collapse of a spherical vapor bubble close to a solid wall are discussed for three different bubble-wall configurations. The major challenge for such numerical investigations is to accurately reproduce the dynamics of the interface between liquid and vapor during the entire collapse process, including the high-speed dynamics of the late stages, where compressibility of both phases plays a decisive role. Direct interface resolving simulations are intractable for real wor...

  4. Texte paru dans G. de Rapper, P. Sints (ds.), Nommer et classer dans les Balkans. Athnes, cole franaise d'Athnes (2008), p. 351-367.

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    2008-01-01T23:59:59.000Z

    Texte paru dans G. de Rapper, P. Sintès (éds.), Nommer et classer dans les Balkans. Athènes, École identitaires » des Balkans et sont également employés par les villageois albanais pour parler d'eux-mêmes. L 2001-2002. 3 J.-F. Gossiaux, Pouvoirs ethniques dans les Balkans (2002), p. 3. 4 C'est-à-dire qui

  5. Les entretiens avec d'anciens soldats : une source pour l'histoire de la torture pendant la guerre d'Algrie

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Les entretiens avec d'anciens soldats : une source pour l'histoire de la torture pendant la guerre, infligées par ses propres soldats? Si elles avaient été accessibles, les archives de la justice militaire de l'armée ne contenaient que peu de traces des violences infligées par les soldats français aux

  6. Modliser et simuler l'amnagement nergtique d'un territoire par les systmes multi-agents

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    Paris-Sud XI, Université de

    Réunion se situe au centre du projet GERRIi (qui est à la fois l'acronyme de Green Energy Revolution

  7. Simulation Server Project 25

    E-Print Network [OSTI]

    1 Simulation Server for Project 25: Inter-RF Subsystem Interface (ISSI) September 30, 2011 Simulation Server v1.0.0 #12;2 1. Executive Overview..................................................................................................................... 5 3.1. Starting the Server

  8. epuis la chute de Slobodan Milosevic, le 5 octobre 2000, les Balkans semblaient

    E-Print Network [OSTI]

    Boyer, Edmond

    epuis la chute de Slobodan Milosevic, le 5 octobre 2000, les Balkans semblaient entrés dans une çlirimtare kombëtare)1, a resurgi un vocabulaire qu'on pensait disparu avec l'apaisement des Balkans. Il Macédoine naît de la rencontre entre une représentation imaginaire des Balkans peu renouvelée ­ propension à

  9. Compensation du mouvement respiratoire dans les images TEP Respiratory motion correction in PET images

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Compensation du mouvement respiratoire dans les images TEP Respiratory motion correction in PET itérative. Abstract The quality of the Positron Emission Tomography (PET) is currently limited an integrated system to compensate respiratory motion in PET images. It is based on synchronous acquisition

  10. Toward LES of an ignition sequence in a full helicopter combustor

    E-Print Network [OSTI]

    Toward LES of an ignition sequence in a full helicopter combustor M. Boileau , J.B. Mossa , B in a cold and rarified atmosphere is a critical issue for many manu- facturers. In the Vesta combustor machine - where the use of 2048 parallel processors have enabled to start computing on the full combustor

  11. NOTE PRLIMINAIRE SUR LES FACTEURS CONDITIONNANT LA TENEUR DE L'ŒUF EN RIBOFLAVINE

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    NOTE PRÉLIMINAIRE SUR LES FACTEURS CONDITIONNANT LA TENEUR DE L'ŒUF EN RIBOFLAVINE J la teneur en riboflavine d'oeufs pondus par des poules de même race recevant une alimentation cas des séquences longues. La teneur du régime en riboflavine a une répercussion sur la teneur de l

  12. LES GRANDEURS CARACTRISTIQUES DE LA PILE DE CHATILLON (1) Par L. KOWARSKI.

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    751. LES GRANDEURS CARACTÉRISTIQUES DE LA PILE DE CHATILLON (1) Par L. KOWARSKI. Laboratoire du de la pile de Châtillon : cuve à eau lourde, barres actives contenant de l'oxyde d'uranium, bloc régime actuel de fonctionnement de la pile ainsi que la puissance qu'elle développe. Il termine en

  13. LES PILES DOMESTIQUES Fiche I La quantit de piles mises en

    E-Print Network [OSTI]

    Skorobogatiy, Maksim

    1 LES PILES DOMESTIQUES Fiche I La quantité de piles mises en marché au Québec L'Association canadienne des piles domestiques (ACPD) estime qu'il s'est vendu environ 48 millions de piles1 au Québec tableau suivant montre une répartition sommaire de ces piles pour cette période : TYPE DE PILES MASSE

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

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    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

  15. Influence de la pression hydrostatique sur les spectres de diffusion Brillouin de la thioure

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Brillouin ne subissent aucune modification lors du passage dans les zones où le paramètre 03B4 se bloque sur apparait une nouvelle phase (VI) qui correspond a la valeur 6 = 1/3, [6, 7J. La structure demeure donc

  16. Les hydrocarbures russes : une industrie en qute de modle Catherine Locatelli

    E-Print Network [OSTI]

    Boyer, Edmond

    Les hydrocarbures russes : une industrie en quête de modèle Catherine Locatelli chargée de ordre dans le domaine des hydrocarbures. Après dix années de baisses sans précédent de sa production'Arabie Saoudite en tant que fournisseur d'hydrocarbures. L'enjeu est important face à la concentration prévisible

  17. Localiser les ruptures prosodiques en temps rel SIGNALER A LA VOLEE

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    LES FRONTIERES PROSODIQUES : une technique comportementale Monique Vion & Annie Colas Laboratoire-en-Provence monique.vion@univ-provence.fr hal-00308394,version1-30Jul2008 Manuscrit auteur, publié dans "Revue Parole was similar to the major intonation breaks signaled by the experts. Breaks were mainly located

  18. Les racines des composantes hyperboliques de M sont des quarts d'entiers alg'ebriques

    E-Print Network [OSTI]

    Bousch, Thierry

    'equation est monique en Z 0 et ` a coefficients dans Z[C], donc Z 0 est un entier alg'ebrique sur l signe pr`es) la fonction sym'etrique 'el'ementaire de degr'e k en les ae i , on a la majoration â?? k (C

  19. TUDE DE LA CONTAMINATION IONIQUE DANS LES SPARATEURS LECTRO-MAGNTIQUES D'ISOTOPES

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    91 ÉTUDE DE LA CONTAMINATION IONIQUE DANS LES SÉPARATEURS ÉLECTRO-MAGNÉTIQUES D'analyse de la composante ionique de la contamination, dans un séparateur électro- magnétique d'isotopes, est'énergie. On explique ainsi, pour une grande part, l'asy- métrie de la contamination généralement constatée et l

  20. 95.2000: 419-432 Les chelles temporelles des oasis du Jrid tunisien

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ANTHROPOS 95.2000: 419-432 Les échelles temporelles des oasis du Jérid tunisien Vincent Battesti discourse offer a different image, namely that of an unchanging oasis and of the past as a golden age ascribe to, must also be taken into account. The "crisis" ofoasis agriculture, a term often used by oasis

  1. EXPOSE ET MISE AU POINT BIBLIOGRAPH 1 QUE PROPAGATION DES CHOCS INTERATOMIQUES DANS LES SOLIDES

    E-Print Network [OSTI]

    Boyer, Edmond

    'effet des radiations sur les solides est un probl6me extremement complexe. Le compor- tement des solides la nature de la radiation utilis6e. Un des effets des radiations est de deplacer un certain nombre d atomes au repos. Leur liaison avec la maille est simplement sch6matis6e par 1'existence d'un seuil 6nerg6

  2. Programme de bourses en codirection pour doctorants Les Universits du Kazakhstan cherchent des codirecteurs

    E-Print Network [OSTI]

    Jeanjean, Louis

    Programme de bourses en codirection pour doctorants Kazakhstan Les Universités du Kazakhstan quarantaine d'établissements d'enseignement supérieur du Kazakhstan. Ce programme s'inscrit dans une politique outil intéressant pour s'engager dans de nouvelles coopérations. L'Ambassade de France au Kazakhstan

  3. DOSAGE RADIOMTRIQUE RAPIDE DE L'URANIUM ET DU THORIUM DANS LES MINERAIS COMPLEXES

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    35 A. DOSAGE RADIOMÉTRIQUE RAPIDE DE L'URANIUM ET DU THORIUM DANS LES MINERAIS COMPLEXES Par G radio métrique rapide de dosage de l'uranium et du thorium dans des minerais complexes. Elle utilise method for the determination of uranium and thorium in complex ores. We use fundamentally two gamma

  4. Action de l'manation du radium sur les sels de thorium Par HERCHFINKEL

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    417 Action de l'émanation du radium sur les sels de thorium Par HERCHFINKEL [Faculté des Sciences'une solution d'azotate de thorium abandonnée a elle-même pendant plusieurs mois dégage une cer- taine quantité'on fait agir une forte quantité d'émanation de radium sur le même sPl de thorium il se produit en- core

  5. In: Contraintes environnementales et gouvernance des territoires, pp180-188 Les conflits environnementaux Richards Bay

    E-Print Network [OSTI]

    Boyer, Edmond

    sud Mots-clefs : conflits environnementaux, industrie, pollution, écologistes, ségrégation Email traitement du titane : figure 1). Les grandes industries et leurs sous-traitants (tissu de petites et construction de nombreuses infrastructures dont un waterfront, une marina et un casino. La ville et ses

  6. LES MATRIAUX POUR PHOTOPILES SOLAIRES M. RODOT, M. BARB et J. DIXMIER

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    solaire, les centrales de conversion thermodynamique ou la production de fuel à partir de biomasse, la of solar cell research shows the necessity of developing a second type of cells which do not use single of building an efficient collecting structure, reliability, capability of use under solar radiation

  7. Les Houches 2013: Physics at TeV Colliders: Standard Model Working Group Report

    E-Print Network [OSTI]

    J. Butterworth; G. Dissertori; S. Dittmaier; D. de Florian; N. Glover; K. Hamilton; J. Huston; M. Kado; A. Korytov; F. Krauss; G. Soyez; J. R. Andersen; S. Badger; L. Barzè; J. Bellm; F. U. Bernlochner; A. Buckley; J. Butterworth; N. Chanon; M. Chiesa; A. Cooper-Sarkar; L. Cieri; G. Cullen; H. van Deurzen; G. Dissertori; S. Dittmaier; D. de Florian; S. Forte; R. Frederix; B. Fuks; J. Gao; M. V. Garzelli; T. Gehrmann; E. Gerwick; S. Gieseke; D. Gillberg; E. W. N. Glover; N. Greiner; K. Hamilton; T. Hapola; H. B. Hartanto; G. Heinrich; A. Huss; J. Huston; B. Jäger; M. Kado; A. Kardos; U. Klein; F. Krauss; A. Kruse; L. Lönnblad; G. Luisoni; Daniel Maître; P. Mastrolia; O. Mattelaer; J. Mazzitelli; E. Mirabella; P. Monni; G. Montagna; M. Moretti; P. Nadolsky; P. Nason; O. Nicrosini; C. Oleari; G. Ossola; S. Padhi; T. Peraro; F. Piccinini; S. Plätzer; S. Prestel; J. Pumplin; K. Rabbertz; Voica Radescu; L. Reina; C. Reuschle; J. Rojo; M. Schönherr; J. M. Smillie; J. F. von Soden-Fraunhofen; G. Soyez; R. Thorne; F. Tramontano; Z. Trocsanyi; D. Wackeroth; J. Winter; C-P. Yuan; V. Yundin; K. Zapp

    2014-05-05T23:59:59.000Z

    This Report summarizes the proceedings of the 2013 Les Houches workshop on Physics at TeV Colliders. Session 1 dealt primarily with (1) the techniques for calculating standard model multi-leg NLO and NNLO QCD and NLO EW cross sections and (2) the comparison of those cross sections with LHC data from Run 1, and projections for future measurements in Run 2.

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

    E-Print Network [OSTI]

    Mackay, Duncan

    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.

  9. Extreme Value GARCH modelling with Bayesian Xin Zhao, Les Oxley, Carl Scarrott and Marco Reale

    E-Print Network [OSTI]

    Hickman, Mark

    Extreme Value GARCH modelling with Bayesian Inference Xin Zhao, Les Oxley, Carl Scarrott and Marco Reale No: 05/2009 #12;2 WORKING PAPER No: 05/2009 Extreme Value GARCH modelling with Bayesian inference, GEV-GARCH, is developed by implementing the GARCH volatility mechanism in these extreme value model

  10. Vrification des Automates File Ractifs : un modle pour les systmes ractifs crits en

    E-Print Network [OSTI]

    Sutre, Grégoire

    with the reactive language Electre. The behavioral model for Electre programs is the class of Reactive Fiffo, reconnaissabilité, décidabilité. KEY WORDS : Verification, reactive systems, Electre, infinite systems, modelVérification des Automates à File Réactifs : un modèle pour les systèmes réactifs écrits en Electre

  11. Absorption du rayonnement 12 et 8 millimtres par les vapeurs de propane sous pression

    E-Print Network [OSTI]

    Boyer, Edmond

    Absorption du rayonnement 12 et 8 millimètres par les vapeurs de propane sous pression A. Battaglia des pertes diélectriques (03B5") présentées par le propane gazeux aux fréquences de 24 et 36 GHz, à la Birnbaum. Abstract. 2014 Experimental study of dielectric losses (03B5") presented by gaseous propane

  12. En vue de l'obtention de l' HABILITATION A DIRIGER LES RECHERCHES

    E-Print Network [OSTI]

    Barthe, Loïc

    a pr´esent´e mon dossier lors des commissions de l'Universit´e. Je remercie enfin tous les ´etudiants plus long . . ., Marc Cardle, Ga¨el Guennebaud, Anca Alexe, Vincent Forest, Olivier Gourmel, Anthony

  13. Innover en formation: Accompagner autrement les enseignants entrant dans le mtier Mars 2012 L'Harmattan

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Innover en formation: Accompagner autrement les enseignants entrant dans le métier Mars 2012 L'Harmattan Mars 2012 L'Harmattan renforcé entre l'école, l'université et un « collectif » de formation in situ

  14. Les processus de surface `a l'echelle globale et leurs interactions avec

    E-Print Network [OSTI]

    Madeleine, Jean-Baptiste

    Mer Océan Atmosphère océanique Biogeochmie La construction d'un mod`ele du syst`eme terre passe par le biomass NPP #12;2.1. Les interactions syst`eme racinaire et humidit´e du sol

  15. D3: Sacred software cows: maintenance Les Hatton, lesh@oakcomp.co.uk

    E-Print Network [OSTI]

    Hatton, Les

    reliability because of my professional interests in software safety. I do, but as you can see here reliability is going to be an important strategic issue in the next few years. The so-called maintenanceD3: Sacred software cows: maintenance Les Hatton, lesh@oakcomp.co.uk Jan 1996 I'll talk this month

  16. Choix de procds de parachvement pour les pices en matriaux composites

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    carbure monobloc ou PCD (Poly Cristallin Diamond), outils diamantés, jet d'eau, laser... Cependant, les (like trimming and drilling) are very diversified: machining with carbide or PCD (Poly Crystalline Diamond) endmills, diamond wheel or disc, water jet, laser... Besides, parameters which permit to make

  17. Contrle social de la privacit selon l'intgrit contextuelle dans les systmes dcentraliss

    E-Print Network [OSTI]

    Boyer, Edmond

    Mines de Saint-Étienne, 158 cours Fauriel, 42023 Saint-Étienne Résumé Les approches habituelles pour la to be ei- ther private or public and to be constrained to a given group of agents, e.g. "my friends", when

  18. La conversion lectromcanique directe. 4 fvrier 1999 -ENS Cachan -SEE LES ENTRANEMENTS LECTROMCANIQUES DIRECTS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    La conversion électromécanique directe. 4 février 1999 - ENS Cachan - SEE LES ENTRA�NEMENTS direct drives represent ultimate simplification of the electromechanical conversion systems because'entraînement électromécanique direct représente la simplification ultime des systèmes de conversion électromécanique d

  19. Le magn)sme ar)ficiel pour les gaz d'atomes froids Jean Dalibard

    E-Print Network [OSTI]

    Dalibard, Jean

    Le magné)sme ar)ficiel pour les gaz d'atomes froids Jean Dalibard Année 2013-14 Chaire Atomes et rayonnement Magné8sme ar8ficiel pour un atome isolé poten8el vecteur et la simula8on du magné8sme orbital A(r) V

  20. Le magn)sme ar)ficiel pour les gaz d'atomes froids Jean Dalibard

    E-Print Network [OSTI]

    Dalibard, Jean

    Le magné)sme ar)ficiel pour les gaz d'atomes froids Jean Dalibard Année 2013-14 Chaire Atomes et rayonnement Magné8sme ar8ficiel pour un atome isolé (I) #12;Simula8on du magné8sme avec des atomes neutres Le but : réaliser pour

  1. Communication pour les XIVe Journes du longitudinal, Ruptures, irrversibilits et imbrications de trajectoires

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    armée de réserve et liste d'attente : les employées du secteur hospitalier à l'aune de la sécurisation pour la catégorie non qualifiée des agents de service hospitaliers (ASH). Ce secteur et ces emplois chaque étude de cas, entre douze et quinze entretiens approfondis ont été réalisés, auprès du management

  2. LA GESTION DE RESULTAT PAR LES MONTAGES FINANCIERS DE TITRISATION : LE

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 LA GESTION DE RESULTAT PAR LES MONTAGES FINANCIERS DE TITRISATION : LE CAS DES SOCIETES FRAN�AISES COTEES Patrick BOISSELIER Professeur des universités Conservatoire National des Arts et Métiers gestion Centre de Recherche en Ingénierie Financière et Finances publiques (Université de Nice

  3. Architecture de contrle pour la gestion Contextuelle de tches sur les AUV

    E-Print Network [OSTI]

    Boyer, Edmond

    Architecture de contrôle pour la gestion Contextuelle de tâches sur les AUV A. El Jalaoui, D niveaux, un superviseur global, des superviseurs locaux et enfin un ensemble de modules de gestion des AUV. L'étude se basera sur le cas de l'AUV Taipan. De taille réduite et conçu pour opérer dans des

  4. CONTROLE DE GESTION, CAPACITES DYNAMIQUES ET STRATEGIES EMERGENTES DANS LES ORGANISATIONS ENTREPRENEURIALES

    E-Print Network [OSTI]

    Boyer, Edmond

    CONTROLE DE GESTION, CAPACITES DYNAMIQUES ET STRATEGIES EMERGENTES DANS LES ORGANISATIONS gerald.naro@univ-montp1.fr Résumé : Cette communication porte sur la problématique du contrôle de gestion/exploration (March, 1991). Elle s'appuie sur l'étude de cas d'une entreprise entrepreneuriale. Il s'agissait de

  5. Les POMDP: une solution pour modliser des problmes de gestion adaptative

    E-Print Network [OSTI]

    Boyer, Edmond

    Les POMDP: une solution pour modéliser des problèmes de gestion adaptative en biologie de la conservation, la gestion adaptative est un processus itératif d'amélioration de la gestion par la réduction de l'incertitude à travers une surveillance. La gestion adaptative est l'outil principal pour la

  6. Gestion stratgique des comptences en PME : les enseignements d'une recherche-action

    E-Print Network [OSTI]

    Boyer, Edmond

    1 Gestion stratégique des compétences en PME : les enseignements d'une recherche-action Jean, France Introduction Si pendant longtemps, le besoin des entreprises n'allait pas au-delà d'une gestion préoccupation croissante autour de la gestion des compétences (Défelix, 2003 ; Le Boterf, 2000), de sorte que

  7. Gestion de la Qualit de Service par les Hypercubes dans un Environnement

    E-Print Network [OSTI]

    Boyer, Edmond

    Gestion de la Qualité de Service par les Hypercubes dans un Environnement de Routage Multipoint : Cas des Protocoles PIM-SM et MPLS Mohamed Dafir ECH-CHERIF EL KETTANI Ecole Nationale Supérieure d mettre en °uvre une politique efficace de gestion de la Qualité de Service liée au groupe. Dans cet

  8. ACTION DE L'ABLATION DES BULBES OLFACTIFS SUR LES MCANISMES DE LA REPRODUCTION

    E-Print Network [OSTI]

    Boyer, Edmond

    ACTION DE L'ABLATION DES BULBES OLFACTIFS SUR LES MÉCANISMES DE LA REPRODUCTION CHEZ LA TRUIE J. P Recheyches zoolechniques, Jouy-en-Josas (Seine et Oise). SOMMAIRE L'ablation chirurgicale des bulbes involution utérine. L'ablation totale des bulbes olfactifs semble donc perturber la décharge des hormones

  9. Tir--part Les espaces boiss du flanc nord-ouest du mont Royal

    E-Print Network [OSTI]

    milieu de la plaine du Saint-Laurent et d'une ville fortement urbanisée, le mont Royal constitue un'arrondissement historique et naturel. Par cette double désignation, il reconnaît que les qualités natu- relles et

  10. Enseignement inter universitaire a distance avec Internet: M ethodes Num eriques Pour les Equations

    E-Print Network [OSTI]

    Jaun, André

    'apprentissage des sciences. Les outils NTICs permettent de nouvelles approches didactiques: · technologie web + news · dur ee minimale · introduire le sujet Etude individuelle du cours 3h · notes sur papier & web · hyper-liens & interactif Exercices rendus sur le web 3h · assimiler NTIC par contexte · stimulation r eciproque Entre

  11. Wave turbulence and Bose-Einstein condensates Fluctuations turbulentes dans les condensats de Bose-Einstein

    E-Print Network [OSTI]

    Wave turbulence and Bose-Einstein condensates Fluctuations turbulentes dans les condensats de Bose-Einstein condensates are considered. A statistical approach is presented following[1] to describe the stationary regime shows rapid oscillation of the condensate. R#19;esum#19;e Le comportement asymptotique des

  12. DNS AND LES WITH STOCHASTIC MODELLING OF SUBGRID ACCELERATION APPLIED TO SOLID PARTICLES IN A HIGH

    E-Print Network [OSTI]

    Boyer, Edmond

    implications for many environmental systems, from sediment transport to at- mospheric dispersion of pollutantsDNS AND LES WITH STOCHASTIC MODELLING OF SUBGRID ACCELERATION APPLIED TO SOLID PARTICLES IN A HIGH Stochastic Acceleration Model), in which an approximation to the instantaneous non-filtered velocity field

  13. La dmarche Eco conception pour les bogies d'ALSTOM Transport

    E-Print Network [OSTI]

    Boyer, Edmond

    and the sustainable development through its Eco design approach. This allows managing the environmental risks, soil and for humans. This article provides an outline the approach of ALSTOM Transport on the basisLa démarche Eco conception pour les bogies d'ALSTOM Transport Julie LANDI (Ingénieur Eco conception

  14. La nouvelle norme ISO/IEC 29110 pour les trs petits organismes

    E-Print Network [OSTI]

    Laporte, Claude Y.

    La nouvelle norme ISO/IEC 29110 pour les très petits organismes Claude Y. Laporte, ing., M école d'ingénieurs canadienne lauréate du Trophée ISO 2011 pour l'enseignement supérieur en normalisation · L'École de technologie supérieure est la lauréate du Trophée ISO pourlauréate du Trophée ISO

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

    SciTech Connect (OSTI)

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

    2012-07-01T23:59:59.000Z

    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)

  16. Software interoperability for energy simulation

    E-Print Network [OSTI]

    Hitchcock, Robert J.

    2002-01-01T23:59:59.000Z

    Tools,” in Building Energy Simulation User News, Vol. 22,Interoperability for Energy Simulation Robert J. Hitchcock,Interoperability for Energy Simulation Robert J. Hitchcock,

  17. Planar Richtmyer-Meshkov instabilities and transition to turbulence

    SciTech Connect (OSTI)

    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

    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.

  18. SYMPOSIUM DE GENIE ELECTRIQUE (SGE'14) : EF-EPF-MGE 2014, 8-10 JUILLET 2014, ENS CACHAN, FRANCE Les enjeux de la conception en phase d'esquisse pour

    E-Print Network [OSTI]

    Boyer, Edmond

    application dans les transports terrestres, aéronautiques, le smart-building, le smart-grid, ... Mots

  19. A Numerical Study of the Influence of a Clearcut on Eddy-Covariance Fluxes of CO2 Measured Above a Forest

    SciTech Connect (OSTI)

    Wang, Weiguo; Davis, Kenneth J.

    2008-09-03T23:59:59.000Z

    We compare the contributions of unit source fluxes over a clear-cutting area in a forest and over the contiguous forested area to the eddy-covariance (EC) flux of CO2 measured at a tower standing in the center of the clearcut under daytime convective conditions. The large-eddy simulation (LES) technique is used to simulate the dispersion and transport of two conservative and passive tracers that are released from the clearcut and from the forested area, respectively. The time series of the LES-generated vertical velocity and the mixing ratios of both tracers on all the levels at the tower location are recorded every model time step during the last hour of each LES run; this somewhat mimics real EC flux measurements at the tower. The contribution of the unit surface flux over the clearcut relative to that over the forested area decreases exponentially with increasing measurement height, decreasing convective boundary layer depth, increasing atmospheric stability, and decreasing size of the clearcut. LES-derived results are fitted to an empirical relation and applied to flux measurements at the 447-m tall tower in Wisconsin, USA. The contribution of the unit flux over the clearcut on the EC flux measured at the 30-m level of the tower is larger than 50% of that over the forested area under most unstable conditions, while smaller than 2.5% at the 396-m level. Existing analytical footprint models are inappropriate to address the clearcut influence due to clearcut-induced heterogeneity of the turbulent flow in the tower area.

  20. PROBLEMES ER (TERMODIN`AMICA) Els problemes proposats pretenen exemplificar les implicacions dels principis b`asics

    E-Print Network [OSTI]

    Batiste, Oriol

    PROBLEMES ER (TERMODIN`AMICA) Els problemes proposats pretenen exemplificar les implicacions dels principis b`asics de la termodin`amica en processos de conversi´o d'energia rellevants per a l

  1. Les pouvoirs urbains Tunis la fin de l'poque ottomane : la persistance de l'Ancien rgime

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    pleinement les pouvoirs urbains afin de reprendre la main dans le jeu des factions de notables face aux ne sont pas parvenus à intégrer tout à fait le jeu des factions de notables dans le fonctionnement

  2. Mthodes et outils pour l'observation et l'analyse des usages tudier les usages pdagogiques

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    l'éducation, Min. de l'éducation : yves.laborey@education.gouv.fr, Sommaire PNER #12;2 Table des...................................................................................... 5 1. Les enjeux des études d'usages des TICs en éducation et en formation

  3. Comptes Rendus des JNC 17 -Poitiers 2011 Caractrisation exprimentale de l'interface fil/matrice dans les composites

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    /matrice dans les composites chanvre/époxy Experimental characterisation of yarn/matrix interface in hemp, the link between an impregnated hemp yarn and the epoxy matrix has been investigated. The micromechanical

  4. Simulating Fluids Exhibiting Microstructure

    E-Print Network [OSTI]

    Title: Simulating Fluids Exhibiting Microstructure Speaker: Noel J. Walkington, ... fluids containing elastic particles, and polymer fluids, all exhibit non-trivial ...

  5. Whole Building Energy Simulation

    Broader source: Energy.gov [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...

  6. rsistances trouves semblent dpendre de la rsistance de la pile; on les limine par divers procds, et notamment en renver-

    E-Print Network [OSTI]

    Boyer, Edmond

    501 résistances trouvées semblent dépendre de la résistance de la pile; on les élimine par divers procédés, et notamment en renver- sant le sens du courant de pile. G. LIPPAMANN R.-T. GLAZEBROOK. 2014 un même pôle de la pile par les deux condensateurs à comparer ; il y a équilibre dans le pont, au

  7. Les armes europennes de Jean-Baptiste Bernadotte (1805-1814)

    E-Print Network [OSTI]

    Boyer, Edmond

    révolutionnaire et grâce à la loi sur l'avancement, le jeune soldat gravit progressivement tous les échelons de l confié à partir de 1805, de nombreux contingents étrangers. L'apparition massive de ces soldats alliés au, Jean-Baptiste Bernadotte eut sous son commandement direct ou indirect plusieurs milliers de soldats

  8. Les racines des composantes hyperboliques de M sont des quarts d'entiers algebriques

    E-Print Network [OSTI]

    Bousch, Thierry

    : (· · ·((Z2 0 + C)2 + 4C)2 + · · ·)2 + 22n -2 C = 22n -1 Z0. Cette ´equation est monique en Z0 et `a sym´etrique ´el´ementaire de degr´e k en les i, on a la majoration k(C) = O(|C| kn/2 ) quand |C

  9. Les parties prenantes au coeur du business model Berthelot Eric, Coissard Steven & Kachour Maher

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Les parties prenantes au coeur du business model Berthelot Eric, Coissard Steven & Kachour Maher prenantes au coeur du business model Résumé L'objectif de ce papier est de mettre la théorie des parties prenantes au coeur du débat sur le concept du business model. Ces dernières ont été souvent ignorées ou

  10. De l'adolescence errante. Variations sur les non-lieux de nos modernits

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    et santé (sous la dir. de C. Sabatier et O. Douville), Paris, L'Harmattan, collection « Espaces altérités » (sous la dir. de O. Douville et de Cl. Wacjman), Paris, L'Harmattan, 2003 Les méthodes cliniques), Paris, L'Harmattan, 2005 Olivier Douville a aussi publié des articles dans des revues scientifiques en

  11. La pollution marine est gnralement provoque par les eaux uses, d'origines

    E-Print Network [OSTI]

    La pollution marine est généralement provoquée par les eaux usées, d'origines domestiques long des bassins-versants qui débouchent sur la mer. Pollution marine 16 Métaux Ils présentent trois indique généralement l'existence d'autres sources de pollution. © Ssuaphoto / Dreamstime.com © Uatp1

  12. Exil ou des-exil ? : les retours impossibles des personnages de Fernando Ansa et Andrea Blanqu

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    allá. He aquí una proposición simple para empezar2 . Depuis la fin du XIXème , l'histoire de l'Uruguay est celle d'incessants allers/retours. Entre 1830 et 19003 , les pays du Río de la Plata, et l'Uruguay nacimiento del Uruguay moderno en la segunda mitad del siglo XIX, Red Académica Avanzada del Uruguay RAU2

  13. L'URANIUM ET LES ARMES L'URANIUM APPAUVRI. Pierre Roussel*

    E-Print Network [OSTI]

    Boyer, Edmond

    L'URANIUM ET LES ARMES � L'URANIUM APPAUVRI. Pierre Roussel* Institut de Physique Nucléaire, CNRS massivement dans la guerre du Golfe, des obus anti- chars ont été utilisés, avec des "charges d'uranium, avec une charge de 300 g d'uranium et tiré par des avions, l'autre de 120 mm de diamètre avec une

  14. Le magn)sme ar)ficiel pour les gaz d'atomes froids Jean Dalibard

    E-Print Network [OSTI]

    Dalibard, Jean

    Le magné)sme ar)ficiel pour les gaz d'atomes froids Jean Dalibard Année 2013-14 Chaire Atomes et rayonnement Magné8sme ar8ficiel et interac8ons : condensats en rota8on #12;Magné8sme dans une assemblée de par8cule en interac8on

  15. Le magn)sme ar)ficiel pour les gaz d'atomes froids

    E-Print Network [OSTI]

    Dalibard, Jean

    Le magné)sme ar)ficiel pour les gaz d'atomes froids Jean Dalibard Année 2013-14 Chaire Atomes et rayonnement #12;Thème général du cours : le magné?sme = q v B = 0 perdu d'avance ? pas forcément... On peut émuler ce magné?sme par

  16. TUDES EN VUE DE DTERMINER LES BESOINS EN ACIDES AMINS SOUFRS.

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    (BENNET et coll, 1942; POMER1BNZE et Coll, 1959) et le Poulet (MILLER et coll, ig65). BENNET et To fins anaboliques (BENNET, 1941; NJAA, 1962) à l'encontre de la méthionine sul- foxide produite par fixation d'un seul oxygène (BENNET, ig39) ! Dans les essais de BENNET et TOENNIES, la supplémentation de la

  17. Rcolte des piments par les femmes destination du march national, pour la production de harissa

    E-Print Network [OSTI]

    notamment. La plaine de Kairouan abrite des cultures irriguées très diversifiées : maraîchage, arboriculture et fourrage destinés au marché national et international. Le Merguellil et la plaine de Kairouan En'exploiter les eaux de la retenue pour développer l'irrigation de la plaine de Kairouan, en aval. Très vite, du

  18. Informations sur le(s) auteur(s) Prnom, NOM et

    E-Print Network [OSTI]

    Boyer, Edmond

    ici comment il a envisagé les différentes études à mener autour du compositeur Louis Grénon (1734 Grénon (1734-1769). Originaire de Saintes, il occupa successivement plusieurs postes, comme beaucoup de musiciens de son temps. Maître de chapelle aux cathédrales du Puy-en-Velay puis de Clermont, il regagna

  19. LES TYROSINASES CUTANES CHEZ LE RAT. MODIFICATIONS AU COURS DU DVELOPPEMENT

    E-Print Network [OSTI]

    Boyer, Edmond

    LES TYROSINASES CUTAN�ES CHEZ LE RAT. MODIFICATIONS AU COURS DU D�VELOPPEMENT ET PENDANT LE CYCLE Sciences appliquées, 69621 Villeurbanne 1 1 R�SUM� Nous avons effectué l'étude des tyrosinases de la peau chez le Rat. Ces tyrosinases sont mises en évidence, après électrophorèse par réaction de Dopa sur gel

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

    E-Print Network [OSTI]

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

    2014-05-07T23:59:59.000Z

    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.

  1. Jeffrey C. Harris and Stephan T. Grilli Department of Ocean Engineering, University of Rhode Island

    E-Print Network [OSTI]

    Grilli, Stéphan T.

    for the simulation of wave-induced sediment transport. Our approach is a one- way coupling of an inviscid flow model and a dynamic Smagorinsky subgrid scale model. After validating the model hydrodynamic predictions, we simulate cases are presented. KEY WORDS: Computational Fluid Dynamics; Hybrid model cou- pling; Large eddy

  2. Radiation detector spectrum simulator

    DOE Patents [OSTI]

    Wolf, M.A.; Crowell, J.M.

    1985-04-09T23:59:59.000Z

    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.

  3. Lagrangian Simulation of Combustion

    SciTech Connect (OSTI)

    Ahmed F. Ghoniem

    2008-05-01T23:59:59.000Z

    A Lagrangian approach for the simulation of reactive flows has been developed during the course of this project, and has been applied to a number of significant and challenging problems including the transverse jet simulations. An efficient strategy for parallel domain decomposition has also been developed to enable the implementation of the approach on massively parallel architecture. Since 2005, we focused our efforts on the development of a semi-Lagrangian treatment of diffusion, and fast and accurate Lagrangian simulation tools for multiphysics problems including combustion.

  4. Dans le Jrid1, rgion d'oasis du Sud-Ouest tunisien, un sentiment de crise qui concerne les ressources foncires et aquifres est sensible. Cette

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Battesti anthropologue 10/05/05 17:40 Page 201 #12;cas. En général, la référence est centrée sur sa propre origine spatiale (« en France, les rendements... » ou « dans le nord de la Tunisie, les fellahs sont les discours locaux que scienti- fiques deux registres de causes, soit le foncier, soit l'eau d

  5. Energetics of Marine Turbine Arrays - Extraction, Dissipation and Diminution

    E-Print Network [OSTI]

    Nishino, Takafumi

    2013-01-01T23:59:59.000Z

    A two-scale modelling approach is discussed to predict the performance and energetics of a large number (more than a few hundred) of marine turbines installed as a power farm in a general coastal environment. The kernel of this approach is that the outer (coastal-scale) model/simulation is to assess the reduction of flow passing through a given farm area as a function of the increase of head loss across the farm, whereas the inner (device-scale) model/simulation uses this function to account for the (otherwise unknown) effect of coastal dynamics for that farm site. Large-eddy simulations (LES) of periodic open channel flow (with a porous plate model representing turbines) are then presented as the device-scale part of such a two-scale model of large marine turbine arrays. Results demonstrate how the energetics of turbine arrays (i.e. extraction, dissipation and diminution of energy in the entire farm area) may change depending on the characteristics of the farm site, array configuration and operating conditio...

  6. Overview of Simulation Strategies for

    E-Print Network [OSTI]

    Rudnyi, Evgenii B.

    topography simulations; Multi-scale simulation (atomistic-continuum); fast coupling of equipment-topography-electrical-reliability modeling Front-end process modeling Integrated modeling of equipment and materials Lithography simulation

  7. 14.12. Ctedra Sampol de Domtica i Eficincia Energtica Les activitats realitzades en el marc de la Ctedra Sampol de Domtica i Eficincia

    E-Print Network [OSTI]

    Oro, Daniel

    «SmartGrid, cas del ParcBIT i la UIB». Finalment en el marc de les actuacions de recerca que han portat

  8. 17 `eme Congr`es Francais de Mecanique Troyes, 29 ao^ut -2 septembre 2005 Localisation et attenuation dans les cavites acoustiques irreguli`eres

    E-Print Network [OSTI]

    Asch, Mark

    ´enuation dans les cavit´es acoustiques irr´eguli`eres Simon F´elix1 , Mark Asch2 , Marcel Filoche1,3 et Bernard

  9. Simulating the Quantum Magnet

    E-Print Network [OSTI]

    Friedenauer, Axel; Glückert, Jan Tibor; Porras, Diego; Schätz, Tobias

    2008-01-01T23:59:59.000Z

    To gain deeper insight into the dynamics of complex quantum systems we need a quantum leap in computer simulations. We can not translate quantum behaviour arising with superposition states or entanglement efficiently into the classical language of conventional computers. The final solution to this problem is a universal quantum computer [1], suggested in 1982 and envisioned to become functional within the next decade(s); a shortcut was proposed via simulating the quantum behaviour of interest in a different quantum system, where all parameters and interactions can be controlled and the outcome detected sufficiently well. Here we study the feasibility of a quantum simulator based on trapped ions [2]. We experimentally simulate the adiabatic evolution of the smallest non-trivial spin system from the paramagnetic into the (anti-)ferromagnetic order with a quantum magnetisation for two spins of 98%, controlling and manipulating all relevant parameters of the Hamiltonian independently via electromagnetic fields. W...

  10. Theory Modeling and Simulation

    SciTech Connect (OSTI)

    Shlachter, Jack [Los Alamos National Laboratory

    2012-08-23T23:59:59.000Z

    Los Alamos has a long history in theory, modeling and simulation. We focus on multidisciplinary teams that tackle complex problems. Theory, modeling and simulation are tools to solve problems just like an NMR spectrometer, a gas chromatograph or an electron microscope. Problems should be used to define the theoretical tools needed and not the other way around. Best results occur when theory and experiments are working together in a team.

  11. Scalable, efficient epidemiological simulation

    SciTech Connect (OSTI)

    Eubank, S. G. (Stephen G.)

    2001-01-01T23:59:59.000Z

    We describe the design and implementation of a system for simulating the spread of disease among individuals in a large urban population over the course of several weeks, In contrast to traditional approaches, we do not assume uniform mixing among large sub-populations or split the population into spatial or demographic subpopulations determined a priori. Instead, we rely on empirical estimates of the social network, or contact patterns, that are produced by TRANSIMS, a large-scale simulation of transportation systems.

  12. Xyce parallel electronic simulator.

    SciTech Connect (OSTI)

    Keiter, Eric Richard; Mei, Ting; Russo, Thomas V.; Rankin, Eric Lamont; Schiek, Richard Louis; Thornquist, Heidi K.; Fixel, Deborah A.; Coffey, Todd Stirling; Pawlowski, Roger Patrick; Santarelli, Keith R.

    2010-05-01T23:59:59.000Z

    This document is a reference guide to the Xyce Parallel Electronic Simulator, and is a companion document to the Xyce Users' Guide. The focus of this document is (to the extent possible) exhaustively list device parameters, solver options, parser options, and other usage details of Xyce. This document is not intended to be a tutorial. Users who are new to circuit simulation are better served by the Xyce Users' Guide.

  13. Sandia National Laboratories: combustion simulation

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    combustion simulation Direct Measurement of Key Molecule Will Increase Accuracy of Combustion Models On March 3, 2015, in Computational Modeling & Simulation, CRF, Energy,...

  14. Sampled simulation for multithreaded processors

    E-Print Network [OSTI]

    Van Biesbrouck, Michael

    2007-01-01T23:59:59.000Z

    1. Starting O? set E?ects in SMT Simulation 2. Evaluatingdual hardware context SMT Processor. . . . . . . . . . . . .results of co-phase matrix simulation. SMT processor con?

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

    E-Print Network [OSTI]

    Grele, Denis D.

    2014-01-01T23:59:59.000Z

    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...(s). For his part, Eric Turcat does not recoil from the challenge and offers in La Rochefoucauld par quatre chemins, not one but four possible methods of understanding apparent disparate fragments of thoughts. Each chapter of his book is devoted to one...

  16. Microsoft PowerPoint - wrf_les_2007_zhu.ppt [Compatibility Mode]

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHighandSWPA / SPRA / USACE SWPA / SPRAresults fromWater Vapor09 -Lower1LES

  17. High performance distributed simulation for interactive simulated vascular reconstruction

    E-Print Network [OSTI]

    Amsterdam, Universiteit van

    performance. 1 Introduction Interactive simulation environments are dynamic systems that combine simula- tion.1 Performance of interactive simulation environments The most important factor in the performance of a dynamic dynamic simulation environment. 1 1 2 2 3 visualization rendering simulation time rendering delay

  18. Création d’une distribution basée sur Scientific Linux 5 pour les processeurs embarqués de l’expérience LHCb

    E-Print Network [OSTI]

    Planche, Sylvain; Mesnard, E

    2010-01-01T23:59:59.000Z

    Les Credit-Card PC (CCPC) sont des serveurs de services pour la gestion des cartes TELL1. Les CCPC sont des PC embarqués dépourvus de disques durs. Ils utilisent etherboot pour démarrer et un serveur NFS pour accéder à leur système d’exploitation. La distribution, Scientific Linux at CERN 4 (SLC4), et le noyau Linux (2.6.9) utilisés doivent être remplacés : une distribution basée sur SLC5 et un noyau 2.6.33 sont préparés. Le changement de version du noyau, du compilateur et de la glibc implique le portage des modules de tierces parties, bibliothèques et autres programmes développés pour les CCPC. Enfin, grâce à quattor, la préparation de paquets RPM permet de déployer le système d’exploitation sur l’ensemble des serveurs de CCPC de l’expérience.

  19. Simulating the Quantum Magnet

    E-Print Network [OSTI]

    Axel Friedenauer; Hector Schmitz; Jan Tibor Glückert; Diego Porras; Tobias Schätz

    2008-02-27T23:59:59.000Z

    To gain deeper insight into the dynamics of complex quantum systems we need a quantum leap in computer simulations. We can not translate quantum behaviour arising with superposition states or entanglement efficiently into the classical language of conventional computers. The final solution to this problem is a universal quantum computer [1], suggested in 1982 and envisioned to become functional within the next decade(s); a shortcut was proposed via simulating the quantum behaviour of interest in a different quantum system, where all parameters and interactions can be controlled and the outcome detected sufficiently well. Here we study the feasibility of a quantum simulator based on trapped ions [2]. We experimentally simulate the adiabatic evolution of the smallest non-trivial spin system from the paramagnetic into the (anti-)ferromagnetic order with a quantum magnetisation for two spins of 98%, controlling and manipulating all relevant parameters of the Hamiltonian independently via electromagnetic fields. We prove that the observed transition is not driven by thermal fluctuations, but of quantum mechanical origin, the source of quantum fluctuations in quantum phase transitions [3]. We observe a final superposition state of the two degenerate spin configurations for the ferromagnetic and the antiferromagnetic order, respectively. These correspond to deterministically entangled states achieved with a fidelity up to 88%. Our work demonstrates a building block for simulating quantum spin-Hamiltonians with trapped ions. The method has potential for scaling to a higher number of coupled spins [2].

  20. Simulating neural systems with Xyce.

    SciTech Connect (OSTI)

    Schiek, Richard Louis; Thornquist, Heidi K.; Mei, Ting; Warrender, Christina E.; Aimone, James Bradley; Teeter, Corinne; Duda, Alex M. [University of Illinois, Urbana-Champaign

    2012-12-01T23:59:59.000Z

    Sandia's parallel circuit simulator, Xyce, can address large scale neuron simulations in a new way extending the range within which one can perform high-fidelity, multi-compartment neuron simulations. This report documents the implementation of neuron devices in Xyce, their use in simulation and analysis of neuron systems.

  1. Snowmass Energy Frontier Simulations

    E-Print Network [OSTI]

    Jacob Anderson; Aram Avetisyan; Raymond Brock; Sergei Chekanov; Timothy Cohen; Nitish Dhingra; James Dolen; James Hirschauer; Kiel Howe; Ashutosh Kotwal; Tom LeCompte; Sudhir Malik; Patricia Mcbride; Kalanand Mishra; Meenakshi Narain; Jim Olsen; Sanjay Padhi; Michael E. Peskin; John Stupak III; Jay G. Wacker

    2013-09-01T23:59:59.000Z

    This document describes the simulation framework used in the Snowmass Energy Frontier studies for future Hadron Colliders. An overview of event generation with {\\sc Madgraph}5 along with parton shower and hadronization with {\\sc Pythia}6 is followed by a detailed description of pile-up and detector simulation with {\\sc Delphes}3. Details of event generation are included in a companion paper cited within this paper. The input parametrization is chosen to reflect the best object performance expected from the future ATLAS and CMS experiments; this is referred to as the "Combined Snowmass Detector". We perform simulations of $pp$ interactions at center-of-mass energies $\\sqrt{s}=$ 14, 33, and 100 TeV with 0, 50, and 140 additional $pp$ pile-up interactions. The object performance with multi-TeV $pp$ collisions are studied for the first time using large pile-up interactions.

  2. Liquid filtration simulation

    SciTech Connect (OSTI)

    Corey, I.; Bergman, W.

    1996-06-01T23:59:59.000Z

    We have a developed a computer code that simulates 3-D filtration of suspended particles in fluids in realistic filter structures. This code, being the most advanced filtration simulation package developed to date, provides LLNL and DOE with new capabilities to address problems in cleaning liquid wastes, medical fluid cleaning, and recycling liquids. The code is an integrated system of commercially available and LLNL-developed software; the most critical are the computational fluid dynamics (CFD) solver and the particle transport program. For the CFD solver, we used a commercial package based on Navier-Stokes equations and a LLNL-developed package based on Boltzman-lattice gas equations. For the particle transport program, we developed a cod based on the 3-D Langevin equation of motion and the DLVO theory of electrical interactions. A number of additional supporting packages were purchased or developed to integrate the simulation tasks and to provide visualization output.

  3. La dynamique de communication entre Hydro-Qubec et les Innus dans le cadre du projet de la Romaine

    E-Print Network [OSTI]

    La dynamique de communication entre Hydro-Québec et les Innus dans le cadre du projet de la Romaine Fortin, 2014 #12;#12;iii Résumé Le mémoire porte sur la dynamique de communication entre Hydro-Québec et, composées dInnus et de représentants dHydro-Québec, et dont le rôle est de gérer les fonds. De plus, le

  4. Communiqu de presse 08 aot 2013 Dcouverte au Maroc d'une tortue marine gante dans les dpts

    E-Print Network [OSTI]

    Communiqué de presse ­ 08 août 2013 Découverte au Maroc d'une tortue marine géante dans les dépôts bouyai - découverte dans les dépôts de la fin du Crétacé des Phosphates du Maroc (Bassin des Oulad Abdoun recherche « Phosphapal » visant à l'étude des faunes de Vertébrés des Phosphates du Maroc, signée entre le

  5. Les hauts fonctionnaires originaires du monde turc (Balkans, Chypre) en Turquie. Document de travail prsent dans le cadre de la premire journe d'tudes du

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Les hauts fonctionnaires originaires du « monde turc » (Balkans, Chypre) en Turquie. Document de ces « territoires perdus », les Balkans ont retenu ici notre attention, dont Kemal Karpat rappelle le politique des Balkans, qui ont été le lieu à la fin du 19ème et au début du 20ème siècles plusieurs

  6. 13.13. Ctedra Sampol de Domtica i Eficincia Energtica La Ctedra Sampol de Domtica i Eficincia Energtica de la Universitat de les Illes

    E-Print Network [OSTI]

    Oro, Daniel

    'activitats docents, de recerca i difusió de l'eficiència energètica, les energies renovables, la implantació de'Enginyers Industrials Superiors de les Illes Balears, la Conselleria de Comerç, Indústria i Energia i la Conselleria de divisió d'energia de Sampol Ingeniería y Obras, SA, en la realització d'estudis tècnics en el marc de la

  7. Mondialisation et territoires religieux dans les espaces tropicaux Effets et enjeux de la mondialisation sur la gographie mondiale de l'hindouisme

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    'émigration hindoue peuvent être classés en cinq phases: les mouvements de population antiques et précoloniaux ; les'abolition de l'esclavage4 (vers l'Ile Maurice, La Réunion, Guyana, le Surinam, la Guyane, la Martinique

  8. COMMUNIQU DE PRESSE I PARIS -MARSEILLE I 25 AOUT 2014 Les glaciers tropicaux ont ragi aux coups de froid de l'Antarctique et du Groenland au

    E-Print Network [OSTI]

    van Tiggelen, Bart

    + COMMUNIQUÉ DE PRESSE I PARIS - MARSEILLE I 25 AOUT 2014 Les glaciers tropicaux ont réagi aux-Unis, de Colombie et du Royaume-Uni. Leur étude, menée sur 21 glaciers andins, est publiée le 24 août 2014 sur le site de la revue Nature. Comme ailleurs sur la planète, les glaciers des tropiques (situés de

  9. Plusieurs centaines de millions de personnes de l'Asie mridionale dpendent des eaux douces stockes dans les glaciers de l`Himalaya.

    E-Print Network [OSTI]

    Loewith, Robbie

    stockées dans les glaciers de l`Himalaya. Etablir scienti quement comment ceux-ci vont se comporter face au (UNIZH) viennent de démontrer que la réduction des glaciers de l'Himalaya se fait moins rapidement que changements clima- tiques (GIEC), les glaciers de l'Himalaya constituent plus que jamais un sujet d

  10. COMMUNIQU DE PRESSE NATIONAL I PARIS I 24 AOUT 2014 Les glaciers tropicaux ont ragi aux coups de froid de l'Antarctique et du Groenland au

    E-Print Network [OSTI]

    PARIS I 24 AOUT 2014 Les glaciers tropicaux ont réagi aux coups de froid de l'Antarctique et du-Uni. Leur étude, menée sur 21 glaciers andins, est publiée le 24 août 2014 sur le site de la revue Nature. Comme ailleurs sur la planète, les glaciers des tropiques (situés de part et d'autre de l

  11. Center for Turbulence Research Proceedings of the Summer Program 2012

    E-Print Network [OSTI]

    Wang, Wei

    -to-cycle variations in internal combustion engines (Richard et al. 2007). The unresolved flame/turbulence in models for turbulent premixed combustion By D. Veynante, T. Schmitt, M. Boileau AND V. Moureau Very few attempts have been made to implement dynamic combustion models in large eddy simulations, whereas

  12. CALTECH ASCI TECHNICAL REPORT 165 Reconstruction of subgrid models for nonpremixed combustion

    E-Print Network [OSTI]

    CALTECH ASCI TECHNICAL REPORT 165 Reconstruction of subgrid models for nonpremixed combustion J. P. Medallo, S. Sarkar and C. Pantano #12;Reconstruction subgrid models for nonpremixed combustion J. P 2003; published 16 September 2003 Large-eddy simulation of combustion problems involves highly

  13. NOTES AND CORRESPONDENCE An Analytic Longwave Radiation Formula for Liquid Layer Clouds

    E-Print Network [OSTI]

    NOTES AND CORRESPONDENCE An Analytic Longwave Radiation Formula for Liquid Layer Clouds VINCENT E of boundary layer clouds have used a convenient but idealized longwave radiation formula for clouds in their large-eddy simulations (LESs). Under what conditions is this formula justified? Can it be extended

  14. Generation, propagation, and breaking of an internal wave beam Heather A. Clark and Bruce R. Sutherlanda

    E-Print Network [OSTI]

    Sutherland, Bruce

    generated by oceanic bottom boundary layer turbulence propagated at angles between 35° and 60° from of large-eddy simulation for the numerical boundary layer and the resulting loss of resolution technique for strongly stratified solutions of NaCl or NaI. The oscillatory forcing leads to the development

  15. J. Fluid Mech. (2010), vol. 643, pp. 233266. c Cambridge University Press 2009 doi:10.1017/S002211200999200X

    E-Print Network [OSTI]

    Cambridge, University of

    2010-01-01T23:59:59.000Z

    002211200999200X 233 Large eddy simulation of a stratified boundary layer under an oscillatory current-mean oscillatory boundary layer based on the value of Reynolds number Res: (i) laminar flow when Res is performed to investigate a bottom boundary layer under an oscillating tidal current. The focus

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

    E-Print Network [OSTI]

    Yoon, Churl

    1996-01-01T23:59:59.000Z

    Turbulence Prediction Using the Large Eddy Simulation Method in Staggered and Inclined Bundles. M. S. Thesis, Texas A&M University. Hassan, Y. A. , Blanchat T. K. , Seeley Jr. , C. H. , and Canaan, R. E. 1992 Simultaneous Velocity Measurements of Both...

  17. ATMOSPHERIC DUST AND MESOSCALE/MICROSCALE METEOROLOGY. A. Spiga1 , S.R. Lewis1

    E-Print Network [OSTI]

    Spiga, Aymeric

    ATMOSPHERIC DUST AND MESOSCALE/MICROSCALE METEOROLOGY. A. Spiga1 , S.R. Lewis1 , and F. For- get2 to advances in computational resources and modeling techniques. Note also that mesoscale modeling and Large: general circulation models, mesoscale models, microscale models [Large-Eddy Simulations]. Figure 1

  18. paratre dans Anne Couderc & Olivier Deslondes (ds.), Frontires et territoires dans les Balkans. Actes du colloque d'Athnes, 20-22 septembre 2006. Athnes: cole franaise d'Athnes

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    À paraître dans Anne Couderc & Olivier Deslondes (éds.), Frontières et territoires dans les Balkans dans les Balkans. De l'administration des empires aux logiques des Etats, de la fin du XVIIIe siècle à

  19. FOURNET, M. & BEDIN, V. (1998). L'ingnierie de formation entre traditionalisme et modernisme ; les nouvelles formes de formation continue vues par des dirigeants de PME-PMI. Formation Emploi, n 63, 43-

    E-Print Network [OSTI]

    Boyer, Edmond

    1998-01-01T23:59:59.000Z

    ; les nouvelles formes de formation continue vues par des dirigeants de PME-PMI. Formation Emploi, n° 63 modernisme Les nouvelles formes de formation continue vues par des dirigeants de PME-PMI Michel Fournet et

  20. 14.2. Fundaci General de la UIB (FuGUIB) La Fundaci General de la Universitat de les Illes Balears (FuGUIB) s una instituci privada, amb

    E-Print Network [OSTI]

    Oro, Daniel

    Balears (FuGUIB) és una institució privada, amb personalitat jurídica pròpia i sense ànim de lucre. Va ser'ha materialitzat en les accions principals següents: -- Reparació integral de les pistes de pàdel i instal·lació de