Abstract
Two types of recently developed improved dynamic sub-grid scale (SGS) models were investigated by simulating turbulent channel flow at Re=180 normalized by channel half-width and friction velocity. The results of those models were compared with DNS data obtained by Kim et al. in 1987. One model developed by Meneveau et al. in 1994, called, the Lagrangean dynamic SGS model, appeared to show some superiority in eliminating the numerical instability that is often observed in the original dynamic SGS model proposed by Germano et al. In 1991, because the results of the model showed good agreement with those of the original dynamic SGS model without statistically homogeneous direction of turbulent flow that is required in the original one. The results of the other model developed by Vreman et al. in 1994, which is called the dynamic mixed SGS model showed better agreement with DNS data than that of the original dynamic SGS model but some numerical instability was still observed.
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