B325 実用的な LES のための混合時間スケール SGS モデルの検討

概要

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A new subgrid-scale (SGS) model for practical large eddy simulation (LES) is proposed. The model is constructed with the concept of mixed (or hybrid) time scale, which enables us to use the consistent model parameters and to dispense with the distance from the wall. The model performance is tested in channel flows, and the results show that this model is able to account for near-wall turbulence without an explicit damping function as in the dynamic SGS model. The proposed model is also applied to the backward-facing step flow examined by Kasagi and Matsunaga experimentally. The calculated results show good agreement with experimental data, while the results obtained by using the dynamic SGS model show less accuracy and less computational stability. These results suggest that the present model is a refined SGS model suited for practical LES.
日本流体力学会の論文
2001-07-31