圧縮性一様等方乱流における一般化スケール相似則モデルの検証(流体工学,流体機械)

概要

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In the present work we carried out the assesment of the generalized scale-similarity model (C_B-C_S) in compressible homogeneous isotropic turbulence at a moderately high Reynolds number, by comparing with previous dynamic subgrid-scale (SGS) stress models, viz. the dynamic Smagorinsky model (DSM), the dynamic mixed model and the dynamic two-parameter mixed model. In the "a priori" test, it was shown that the SGS stress tensor obtained using the C_B-C_S model had the closest agreement with the exact value, and the amount of energy transfer between subgrid-scale energy and grid-scale energy was most accurately predicted using the C_B-C_S model. In an actual large-eddy simulation, it was shown that both the development of turbulent energy and the evolution of the turbulent structure, such an the vortex tube, predicted using the C_B-C_S model were close to those of the filtered DNS data. The primary cause for a high accuracy of the scale-similarity model was explored.
2005-02-25