Results 221 to 230 of about 5,893 (266)

An Efficient Flow Solver with a Transport Equation for Modeling Turbulence

19th AIAA Computational Fluid Dynamics, 2009
A three-stage Runge-Kutta (RK) scheme with multigrid and an implicit preconditioner has been shown to be an effective solver for the fluid dynamic equations. Using the algebraic turbulence model of Baldwin and Lomax, this scheme has been used to solve the compressible Reynolds-averaged Navier-Stokes (RANS) equations for transonic and low-speed flows ...
Swanson, Ray Charles, Rossow, Cord-Christian   +1 more
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Transition modelling with the k-Ω turbulence model and an intermittency transport equation

Journal of Thermal Science, 2003
A transition model for describing bypass transition is presented. It is based on a two-equations k–ω model and a dynamic equation for intermittency factor. The intermittency factor is a multiplier of the turbulent viscosity computed by the turbulence model. Following a suggestion by Menter et al.
Koen Lodefier, Bart Merci, Chris De Langhe, Erik Dick   +3 more
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Numerical Study and Lagrangian Modelling of Turbulent Heat Transport

Flow, Turbulence and Combustion, 2007
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Couzinet, Anthony, Bédat, Benoit, Simonin, Olivier   +2 more
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Scalar Variance Transport in the Turbulence Modeling of Propulsive Jets

Journal of Propulsion and Power, 1999
A variable turbulent Prandtl number model is applied to the prediction of laboratory jets with signie cant temperature variations. The model involves solving supplemental scalar equations for the temperature variance anditsdissipationratealongwiththe k‐"equations.Themodelisalsoappliedtojetswithvariablecompositionwith the aim of building a consolidated ...
N. Chidambaram, S. Dash, D. Kenzakowski
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Modeling Of Turbulent Transport Equations

1996
The high-Reynolds-number turbulent flows of technological importance contain such a wide range of excited length and time scales that the application of direct or large-eddy simulations is all but impossible for the foreseeable future. Reynolds stress models remain the only viable means for the solution of these complex turbulent flows.
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First and second order modelling of turbulent scalar transport in homogeneous turbulence

Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer, 2006
The present work aims at developing a full second order model for turbulent transport of a passive scalar. A turbulent Prandtl number formulation is obtained by reducing the second order modelling. A first order turbulence model is than proposed with an algebraic formulation of the turbulent scalar flux.
H. Ayed, J. Chahed, V. Roig
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Modeling of Interphase Turbulent Transport Processes

Industrial & Engineering Chemistry Research, 2007
Exchange of heat and mass across deformable fluid-fluid interfaces is central to many industrial and environmental processes but is still poorly understood, despite the considerable effort that has gone into its study-uncertainties in greenhouse gas uptake estimates are still very large.
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Transport and turbulence modeling of solar wind fluctuations

Journal of Geophysical Research: Space Physics, 1990
Magnetohydrodynamic (MHD) activity, including waves and turbulence, has been a focus of attention in solar wind research for several decades, owing to the wealth of available relevant spacecraft observations. Characterizations of the turbulence have generally been based on incompressible homogeneous turbulence theory.
Ye Zhou, William H. Matthaeus
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A generic model for transport in turbulent shear flows

Physics of Plasmas, 2011
Turbulence regulation by large-scale shear flows is crucial for a predictive modeling of transport in plasma. In this paper the suppression of turbulent transport by large-scale flows is studied numerically by measuring the turbulent diffusion Dt and scalar amplitude 〈n′2〉 of decaying passive scalar fields n′ advected by various turbulent flows.
Andrew P. L. Newton, Eun-Jin Kim
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Modeling the Dynamics of Turbulent Transport Processes

1991
Publisher Summary This chapter illustrates universal differential second-order model of nearly homogeneous velocity and scalar fields by the closure technique based on the semiempirical theory of nearly homogeneous two-point correlations. It also analyzes the process of scalar field transfer in the evolving nearly homogeneous velocity field on the ...
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