DNSデータベースによる壁乱流ε方程式の総合的評価 : 第1報, k-ε2方程式モデルの場合

概要

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Using direct numerical simulation (DNS) database for wall turbulence, we have performed critical assessment of representative dissipation-rate equations (i.e., ε-or ε-equations) for k-ε turbulence models and proposed a new dissipation-rate equation. The DNS data of mean velocity and turbulent kinetic energy are used as the known exact quantities for solving theε-or ε-equation. Thus, the obtained values ofεare the true solutions with no contaminants. The assessment indicates that, except for one recent model, the performance in predicting the exactε profiles is poor, irrespective of the model type. The proposed model constructed on the basis of the proposal of Nagano and Hishida (1987) provides a good performance, though the model formulation is very simple.
社団法人日本機械学会の論文
1993-06-25