Journal of Fluid Mechanics



A dynamic localization model for large-eddy simulation of turbulent flows


Sandip  Ghosal a1, Thomas S.  Lund a1, Parviz  Moin a1 and Knut  Akselvoll a1
a1 Center for Turbulence Research, Stanford University, Stanford, CA 94305, USA

Article author query
ghosal s   [Google Scholar] 
lund ts   [Google Scholar] 
moin p   [Google Scholar] 
akselvoll k   [Google Scholar] 
 

Abstract

In a previous paper, Germano, et al. (1991) proposed a method for computing coefficients of subgrid-scale eddy viscosity models as a function of space and time. This procedure has the distinct advantage of being self-calibrating and requires no a priori specification of model coefficients or the use of wall damping functions. However, the original formulation contained some mathematical inconsistencies that limited the utility of the model. In particular, the applicability of the model was restricted to flows that are statistically homogeneous in at least one direction. These inconsistencies and limitations are discussed and a new formulation that rectifies them is proposed. The new formulation leads to an integral equation whose solution yields the model coefficient as a function of position and time. The method can be applied to general inhomogeneous flows and does not suffer from the mathematical inconsistencies inherent in the previous formulation. The model has been tested in isotropic turbulence and in the flow over a backward-facing step.

(Published Online April 26 2006)
(Received June 17 1994)
(Revised October 3 1994)



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