Results 161 to 170 of about 377,594 (201)

Momentum Transfer Model for Reynolds Stresses

Journal of the Hydraulics Division, 1977
As with most other natural phenomena turbulence has to be approximate by a simplified mathematical model to be approximated by a simplified mathematical model to render its effects amenable to engineering analysis and for turbulence there are few models that can match in simplicity and effectiveness the phenomenological momentum transfer model ...
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Testing Reynolds stress model in solar interior

Proceedings of the International Astronomical Union, 2006
AbstractThe Reynolds stress model (RSM) for turbulent convection motion is compared to the MLT in solar model. The free parameters involved in the RSM are also tested with the aid of helioseismology. It is found that, the structure of solar convection zone is differ from the MLT when using the RSM, especially for the Reynolds correlations and the ...
J. Y. Yang, Y. Li
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Reynolds-stress modelling of turbulent rotating flows

Acta Mechanica Sinica, 1997
The present analysis shows that the EVM can not reflect the turbulence physics in non-inertial frame. The effects of Coriolis force on turbulence is embodied naturally in the Reynolds-stress transport equation. It is observed that the existing second-moment closure model with appropriate near-wall treatment can adequately predict flows in rotating ...
Wang Chen, Fu Song
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An improved algebraic Reynolds stress model and corresponding nonlinear stress model

Physics of Fluids A: Fluid Dynamics, 1992
An improved algebraic Reynolds stress model is developed from the modeled dynamic equations for the Reynolds stress. The improved model more closely represents the original Reynolds stress model equation than the standard algebraic Reynolds stress model over the range of time scales for the turbulence and mean flow strain field.
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Modelling of rapid pressure—strain in Reynolds-stress closures

Journal of Fluid Mechanics, 1994
The most general form for the rapid pressure—strain rate, within the context of classical Reynolds-stress transport (RST) closures for homogeneous flows, is derived, and truncated forms are obtained with the aid of rapid distortion theory. By a classical RST-closure we here denote a model with transport equations for the Reynolds stress tensor and the ...
Johansson, Arne V., Hallbäck, Magnus
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Reynolds-Stress Closure Model for Conditional Variables

1985
Free boundaries of turbulent shear flows show an intermittent character with a sharp interface separating instantaneously turbulent and non-turbulent zones shown by Corrsin and Kistler (1954). Prediction models for turbulent shear flows did not take this intermittent character into account so far.
J. Janicka, W. Kollmann
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Compressible Turbulence Predicted by Reynolds Stress Models

SAE Technical Paper Series, 1991
<div class="htmlview paragraph">Turbulence in strongly compressible flows as found in internal combustion engines is investigated with several models of turbulence. The standard <i>k</i> - ϵ model, 2 classical and 4 of the most recent Reynolds Stress models are used in this investigation. The compressible flow with a non-zero velocity
C. Borgnakke, Y. Xiao
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A New Explicit Algebraic Reynolds Stress Model

1996
A new explicit algebraic Reynolds stress model (EARSM) is presented, which represents an exact description of the implicit algebraic Reynolds stress model with linear models for the terms involved. In contrast to earlier published models there is here no need for ad-hoc assumptions about the production to dissipation ratio.
Arne V. Johansson, Stefan Wallin
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Fully Explicit and Self-Consistent Algebraic Reynolds Stress Model

Theoretical and Computational Fluid Dynamics, 1996
A fully explicit, self-consistent algebraic expression (for Reynolds stress) which is the exact solution to the Reynolds stress transport equation in the ``weak-equilibrium'' limit for two-dimensional mean flows for all linear and some quasi-linear pressure-strain models, is derived.
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Reynolds-Stress and Scalar Flux Transport Model

2010
This chapter presents modeled forms of the Reynolds stress and scalar flux transport equations. It is shown that the modeling of several terms of the exact Reynolds stress and scalar flux transport equation is far more complex than that of the turbulence kinetic energy equation.
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