A144 スパン方向、流れ方向および壁垂直方向に回転するチャネル乱流の数値予測

概要

論文の詳細を見る
Turbulent channel flows rotating about the spanwise, streamwise and wall-normal axes are calculated with a low-Reynolds-number second-moment closure. In the case of weak streamwise rotation, a shear stress component induced by the rotaion changes its sign at a position between the wall and the centerline. This feature is captured by the model. At high rotation rates, however, the sign reversal disappears in DNS and the predicted sign disagrees with that of DNS, leading to poor predictions of the velocity profiles. A need for a redistribution process which works against the exact rotational production is suggested. The wall-normal rotation leads to relaminarization of the flow when the rotation rate becomes high. Good predictions are obtained for weak rotation but the model gives relaminarization at a lower rotation number than DNS.
一般社団法人日本機械学会の論文
2002-11-06