DIRECT TESTING OF SUBGRID-SCALE MODELS

Results are given from a study in which models used in large-eddy simulation of turbulent flow are tested using results of exact simulations of the Navier-Stokes equations. The results to date are for models of the eddyviscosity type applied to incompressible homogeneous turbulence (either isotropic or in the presence of applied irrotational plane strain). The comparisons are by means of correlation coefficients; model parameters are calculated by matching the rms magnitudes of the exact and modeled quantities. Effects on these correlation coefficients and model parameters are shown for variations in attributes of the large eddy simulation (e.g., filter type and width and differencing method) as well as in parameters of the flow simulated (e.g., Reynolds number and strain rate). © 1979 American Institute of Aeronautics and Astronautics, Inc., All rights reserved.