Large-Eddy Simulation of High Reynolds Number Cannel Flow applying Explicit Filtering

Abstract

Correct representation of the effects of the turbulence structure near solid boundaries is very important for successful large-eddy simulation (LES). In the present work, this so-called wall-layer modeling is done on commutation error terms near solid boundaries obtained by explicit filtering. These terms are ignored in conventional LES, but in the present work, these error terms are modeled using a dynamic procedure, making use of the scale-similarity of the modeled terms. It is found, by applying the procedure in LES of a high Reynolds number channel flow, that the dynamic modeling of these error terms makes it possible to gain the roughly same velocity profile as DNS results statistically, and moreover, to simulate the features of large-scale structures instantaneously.