C133 乱流拡散モデルの改良による乱流予測精度の向上についての一考察

概要

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In order to derive a possible direction for improvements of an algebraic turbulent diffusion model used in the two-equation turbulence model, the relation between the turbulent diffusion vector and the Reynolds stress tensor was examined by using LES data for a fundamental channel-flow case. The present calibration has elucidated that the turbulent diffusion vector obtainable from the simple GGDH, as well as the well-known linear eddy-viscosity model, hardly aligns with the LES results. It has also been found that an expanded form of the GGDH model introducing quadratic products of the Reynolds stresses showed generally acceptable predictive performance. Considering this, in the present study, some model expressions were newly proposed and a priori tests were attempted to compare the prediction accuracy of the models.
日本流体力学会の論文
2000-07-25