Comparative Study of Implicit and Subgrid-Scale Model LES Techniques for Low-Reynolds Number Airfoil Applications

Abstract

A computational study of the standard large eddy simulation (LES) technique employing the dynamic Smagorinsky subgrid scale (SGS) model is compared to results using a highorder, implicit LES (ILES) technique with no SGS modeling. It has been shown in the past that ILES presents a viable substitute to the standard LES technique on canonical turbulent problems. The purpose of this paper is to evaluate the use of implicit LES with and without explicit subgrid scale models applied to problems of transitional ow over the SD7003 airfoil for various grid resolutions and Reynolds numbers. It will be shown that the addition of the SGS model does not oer a signicant advantage on coarser meshes when compared to the ILES approach. The ILES technique is shown to be an attractive alternative to SGS modeling in solution quality and computational cost and robustness for the ows examined.