DNSデータベースによる温度場2方程式モデルのモデリング : 第1報,温度乱れ散逸方程式の評価・再構築

概要

論文の詳細を見る
A rigorous two-equation heat-transfer model has been constructed with the aid of the most up-to-date direct numerical simulation (DNS) data for wall turbulence with heat transfer. The DNS -data indicate that the near-wall profile of the dissipation rate, ε_t, for temperature variance, t^2, is completely different from the existing model predictions. In the 1st report, we have performed a critical assessment of existing ε_t-and ε_t-equations for both two-equation and second-order closure models. Based on these assessments, we propose a new dissipation-rate equation for temperature variance, taking into account all the budget terms in the exact ε_t-equation. Comparisons of the present model predictions with the DNS data for a channel flow with heat transfer show an excellent agreement for the profiles of εt itself and the budget in the ε_t-equation.
1995-03-25