実用的なLESのための混合時間スケールSGSモデル(流体工学, 流体機械)

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 plane chanel flows, and the results show that this model is able to account for nearwall turbulence without an explicit damping function as in the dynamic Smagorinsky model. The proposed model is also applied to the backward-facing step flow examined by Kasagi and Matsunaga(1995) experimentally. The calculated results show good agreement with experimental data, while the results obtained by using the dynamic Smagorinsky model show less accuracy and less computational stability. These results suggest that the present model is a refined SGS model suited for practical LES to compute flows in a complex geometry.
社団法人日本機械学会の論文
2002-09-25