壁面せん断流における乱流エネルギー散逸の輸送方程式のモデリング : 直接シミュレーションデータとの比較

概要

論文の詳細を見る
With the aid of direct simulation data (DNS), we have constructed near-wall modeling of the dissipation-rate equation for a κ-ε turbulence model. All the budget terms in the exact ε-equation are incorporated in the modeled ε-equation, and both term-to-term and overall comparisons of model predictions with the DNS data are performed. It is found that the wall region should be partitioned into at least two regions so as to reflect different mechanism of generation processes in the dissipation of turbulent kinetic energy. Pressure diffusions in the κ-and ε-equations are found to be equally important and thus be modeled. Comparisons of the resultant κ-ε model with the DNS data of channel and flat-plate boundary layer flows show close agreement of various turbulent quantities. In particular, near-wall behavior of ε is accurately reproduced with the present model.
社団法人日本機械学会の論文
1993-03-25