[求助]

jzj981

静水中的射流，网格怎么划分？只是一个长方体，在其中一个面上开一个空射流，另一个短面为出口，计算过程总是出现 reversed flow in 66 faces on outflow 4。
1 1.0000e+00 4.0148e-03 3.2189e-06 4.3515e-06 3.3529e-08 6.1582e-01 5.2744e-01  0:14:57  299
reversed flow in 66 faces on outflow 4.
     2 1.0000e+00 6.0764e+00 2.2318e-03 1.9086e-03 3.4137e-07 4.3882e-01 3.5339e-01  0:12:55  298
reversed flow in 403 faces on outflow 4.
     3 2.8622e-01 2.2628e-01 2.9164e-02 2.9011e-02 1.5483e-07 2.7040e-01 3.0462e-01  0:12:17  297
reversed flow in 371 faces on outflow 4.
     4 2.4501e-01 1.2214e-01 4.0158e-02 3.2511e-02 1.2765e-07 1.4065e-01 2.5823e-01  0:11:46  296
reversed flow in 398 faces on outflow 4.
     5 1.2826e-01 6.6043e-02 1.9948e-02 1.8341e-02 9.6859e-08 9.3943e-02 2.1064e-01  0:11:21  295
reversed flow in 409 faces on outflow 4.
这是怎么回事呀？网格有问题吗？用其他模型也是这样。请高手指点。