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0_1519692297906_捕获.JPG 是否是这样？应力张量我可以理解。我的疑问是速度梯度在笛卡尔坐标系下变换之后直接就变成在极坐标系中了速度梯度了？
计算不准这个问题，你或许可以看看改变下网格。我之前看过一些文献，这种圆柱绕流用的都是那种园网格。比如这个帖子里面的讨论：http://www.cfd-china.com/topic/664/cd计算不准的问题-les-re3900-三维圆柱绕流-pisofoam/6
