[求助]reversed flow in 751 faces on outflow 4是怎么回事？

jzj981

我做的体网格，计算时总是出现  
reversed flow in 136 faces on outflow 4.
     2 1.0000e+00 7.4770e+01 1.4964e-02 1.4588e-02 6.5560e-07 6.9185e-01 7.8901e-01 3.7172e-01 3.7199e-01 3.7208e-01 1.0449e+01 5.2346e-01 9.1707e+00  1:26:28  198
reversed flow in 751 faces on outflow 4.
     3 7.1158e-01 6.6110e-02 3.6212e-02 3.4851e-02 4.6123e-07 5.4197e-01 7.6794e-01 4.3357e-01 4.3452e-01 4.3479e-01 7.9929e+01 1.1728e+01 8.1848e+01  1:19:59  197
reversed flow in 676 faces on outflow 4
算不出来结，不收敛， 是不是 说有回流出现了？reversed flow in 676 faces on outflow 是怎么回事？网格划分有问题吗？请高手指点，谢谢。