Results 141 to 150 of about 375 (167)

Robust dynamic adaptation of the Smagorinsky model based on a sub-grid activity sensor

Physics of Fluids, 2021
The present study deals with the application of a sub-grid activity sensor to an eddy viscosity type base model in the context of Large Eddy Simulation (LES). The coherent structure function is used to build this sensor in combination with explicit test filtering. The proposed sensor features two main advantages: First, it attenuates the sub-grid scale
J. Hasslberger, L. Engelmann, A. Kempf, M. Klein   +3 more
openaire   +1 more source

Reduction of the Germano-identity error in the dynamic Smagorinsky model

Physics of Fluids, 2009
We revisit the Germano-identity error in the dynamic modeling procedure in the sense that the current modeling procedure to obtain the dynamic coefficient may not truly minimize the error in the mean and global sense. A “corrector step” to the conventional dynamic Smagorinsky model is proposed to obtain a corrected eddy viscosity which further reduces ...
Park, Noma, Mahesh, Krishnan
openaire   +2 more sources

A general optimal formulation for the dynamic Smagorinsky subgrid-scale stress model

International Journal for Numerical Methods in Fluids, 2005
Summary: A general optimal formulation for the dynamic Smagorinsky subgrid-scale (SGS) stress model is reported. The Smagorinsky constitutive relation has been revisited from the perspective of functional variation and optimization. The local error density of the dynamic Smagorinsky SGS model has been minimized directly to determine the model ...
Bing-Chen Wang
exaly   +2 more sources

Accounting for Scale-Dependence in the Dynamic Smagorinsky Model

1999
The dynamic model has been very successful in Large-Eddy Simulation of a variety of turbulent flows. The model makes the crucial assumption that the coefficient is scale-invariant, which is reasonable in the inertial range of turbulence. Surprisingly, the dynamic model’s success has occurred even in flows where the grid-scale is not in an ideal ...
Meneveau, C., Porte-Agel, F., Parlange, M. B.   +2 more
openaire   +2 more sources

On the relevance of the type of contraction of the Germano identity in the new integral-based dynamic Smagorinsky model

Computers and Fluids, 2013
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Filippo Maria Denaro
exaly   +4 more sources

Large eddy simulations of stratified turbulence: the dynamic Smagorinsky model

Journal of Fluid Mechanics, 2015
The dynamic Smagorinsky model for large eddy simulation (LES) of stratified turbulence is studied in this paper. A maximum grid spacing criterion of${\it\Delta}/L_{b}<0.24$is found in order to capture several of the key characteristics of stratified turbulence, where${\it\Delta}$is the filter scale and$L_{b}$is the buoyancy scale. These results show
Sina Khani, Michael L. Waite
openaire   +1 more source

Finite element-based large eddy simulation using a combination of the variational multiscale method and the dynamic Smagorinsky model

Journal of Turbulence, 2017
ABSTRACTA finite element-based large eddy simulation (LES) is proposed using a combination of the residual-based variational multiscale (RBVMS) approach and the dynamic Smagorinsky eddy-viscosity model. In this combined model, the cross-stress terms are modelled using the RBVMS approach while the eddy-viscosity model is used to represent the Reynolds ...
Onkar Sahni
exaly   +2 more sources

The dynamic Smagorinsky model and scale-dependent coefficients in the viscous range of turbulence

Physics of Fluids, 1997
The standard dynamic procedure is based on the scale-invariance assumption that the model coefficient C is the same at the grid and test-filter levels. In many applications this condition is not met. We consider the case when the filter-length, Δ, approaches the Kolmogorov scale, η, and C(Δ→η)→0̇.
Meneveau, Charles, Lund, Thomas S.
openaire   +2 more sources

Dynamic Smagorinsky Modeled Large-Eddy Simulations of Turbulence Using Tetrahedral Meshes

AIAA Scitech 2019 Forum, 2019
Eddy-resolving numerical computations of turbulent flows are emerging as viable alternatives to Reynolds Averaged Navier-Stokes (RANS) calculations for flows with an intrinsically steady mean state due to the advances in large-scale parallel computing.
Chau-Lyan Chang, Balaji Venkatachari
openaire   +1 more source

Comparative study of large eddy simulation of film cooling using a dynamic global-coefficient subgrid scale eddy-viscosity model with RANS and Smagorinsky Modeling

International Communications in Heat and Mass Transfer, 2011
Abstract An eddy-viscosity subgrid-scale model proposed by You and Moin [1] applied in large-eddy simulation of a film cooling flow at Re = 4700. The present model needs only a single-level test filter, and therefore is more suitable for large-eddy simulation (LES) in complex geometries.
Soheil Soleimani, D D Ganji, E Ghasemi   +2 more
exaly   +2 more sources