scholarly journals A dynamic regularized gradient model of the subgrid-scale stress tensor for large-eddy simulation

2016 ◽  
Vol 28 (2) ◽  
pp. 025114 ◽  
Author(s):  
A. Vollant ◽  
G. Balarac ◽  
C. Corre
Keyword(s):  
Large Eddy Simulation ◽  
Stress Tensor ◽  
Subgrid Scale ◽  
Eddy Simulation ◽  
Gradient Model ◽  
Large Eddy

On the modelling of the subgrid-scale and filtered-scale stress tensors in large-eddy simulation

2001 ◽  
Vol 441 ◽  
pp. 119-138 ◽  
Author(s):  
DANIELE CARATI ◽  
GRÉGOIRE S. WINCKELMANS ◽  
HERVÉ JEANMART
Keyword(s):  
Large Eddy Simulation ◽  
Stress Tensor ◽  
Large Scale ◽  
Stokes Equations ◽  
Exact Result ◽  
Navier Stokes ◽  
Exact Nature ◽  
Subgrid Scale ◽  
Eddy Simulation ◽  
Large Eddy

The large-eddy simulation (LES) equations are obtained from the application of two operators to the Navier-Stokes equations: a smooth filter and a discretization operator. The introduction ab initio of the discretization influences the structure of the unknown stress in the LES equations, which now contain a subgrid-scale stress tensor mainly due to discretization, and a filtered-scale stress tensor mainly due to filtering. Theoretical arguments are proposed supporting eddy viscosity models for the subgrid-scale stress tensor. However, no exact result can be derived for this term because the discretization is responsible for a loss of information and because its exact nature is usually unknown. The situation is different for the filtered-scale stress tensor for which an exact expansion in terms of the large-scale velocity and its derivatives is derived for a wide class of filters including the Gaussian, the tophat and all discrete filters. As a consequence of this generalized result, the filtered-scale stress tensor is shown to be invariant under the change of sign of the large-scale velocity. This implies that the filtered-scale stress tensor should lead to reversible dynamics in the limit of zero molecular viscosity when the discretization effects are neglected. Numerical results that illustrate this effect are presented together with a discussion on other approaches leading to reversible dynamics like the scale similarity based models and, surprisingly, the dynamic procedure.

scholarly journals Comparisons of Subgrid-Scale Models for OpenFoam Large- Eddy Simulation

2021 ◽  
Vol 1802 (4) ◽  
pp. 042088
Author(s):  
Zhipeng Feng ◽  
Huanhuan Qi ◽  
Xuan Huang ◽  
Shuai Liu ◽  
Jian Liu
Keyword(s):  
Large Eddy Simulation ◽  
Subgrid Scale ◽  
Eddy Simulation ◽  
Scale Models ◽  
Large Eddy

Subgrid scale modeling considerations for large eddy simulation of supercritical turbulent mixing and combustion

2021 ◽  
Vol 33 (7) ◽  
pp. 075112
Author(s):  
Umesh Unnikrishnan ◽  
Hongfa Huo ◽  
Xingjian Wang ◽  
Vigor Yang
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Mixing ◽  
Subgrid Scale ◽  
Eddy Simulation ◽  
Scale Modeling ◽  
Large Eddy ◽  
Subgrid Scale Modeling

scholarly journals Atmospheric stability effect on subgrid-scale physics for large-eddy simulation

2001 ◽  
Vol 24 (9-10) ◽  
pp. 1085-1102 ◽  
Author(s):  
Fernando Porté-Agel ◽  
Markus Pahlow ◽  
Charles Meneveau ◽  
Marc B. Parlange
Keyword(s):  
Large Eddy Simulation ◽  
Atmospheric Stability ◽  
Subgrid Scale ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Stability Effect
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