DNS データベースによる GS-SGS 間エネルギー伝達の評価

概要

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In this study, GS-SGS energy transfer is investigated based on a DNS data base of three-dimensional homogeneous isotropic turbulence and turbulent mixing layer. In the case with a Gaussian filter, the Bardina model for the Cross term predicts the overall features of the energy transfer, but shows large energy transfer in the high-wave-number region. For the Reynolds term, the Smagorinsky model shows large energy transfer compared with the exact one. The Bardina model for the Reynolds term shows the same tendency as is observed for the Cross term. In the case with a Gaussian and sharp cut-off filter which corresponds to the real LES, almost all models for the SGS stress show incorrect GS-SGS energy transfer. The Bardina model for the Cross and Reynolds terms also predicts the overall features of the energy transfer even for the turbulent mixing layer, but shows energy transfer from SGS to GS in the high-wave-number region.
一般社団法人日本機械学会の論文
1996-04-25