Evaluation of Energy Transfer between Grid Scale and Subgrid Scale by Use of Direct Numerical Simulation Data Base.

Abstract

Energy transfer between grid scale(GS)and subgrid scale(SGS)induced by SGS stress in large eddy simulation is investigated by direct numerical simulation of homogeneous isotropic turbulence and a turbulent mixing layer. From the results of this study, the following conclusions were reached. (1)No correlation between the Leonard term and Cross term exists from the viewpoint of energy transfer. (2)The Smagorinsky model for the Reynolds term predicts very large energy transfer compared with that obtained from the DNS data. (3)The Bardina models for the Reynolds term and Cross term predict large energy transfer from SGS to GS in the high wave number region, which indicates that the Bardina model causes excessive backward scattering in the high wave number region.