圆柱绕流中的雷诺应力弱化现象的讨论
A Review of Weakening of Reynolds Stress in Cylindrical Flow

基于对圆柱绕流的直接数值仿真的数据的调查，我们讨论了k-ò模型对雷诺应力的预测与实际雷诺应力的差别，并发现在圆柱后方的雷诺应力湍流时有弱化的趋势，此外在渠道两翼侧存在应力强化的区域，描述这些趋势的比例系数没有表现出和墙壁距离的相关性。
With the result of direct numerical simulation on cylindrical flow, it was discussed of the differences of Reynolds stress between that from prediction of k-epsilon model and that from realistic velocity of flow. It was found that the Reynolds stress tends to be weakened in the area behind the cylinder, but tend to be enhanced at the wing-side of the channel; the coefficient for description of the weak-ening didn’t show correlations to the distance to the wall.