[求助]高手帮帮我！！
我在计算内螺纹管超临界水的传热，选的是RNG k-e模型，入口条件为质量入口，出口为OUTFLOW;其工质物性用UDF处理，问题好像就处在物性这里（保证UDF程序没有问题）：当将粘度的UDF 加上，就会出错（错误烦请详见附件），如果将粘度设为一定值，就可以。为什么？？请给我帮助！！！！谢谢！
iter continuity x-velocity y-velocity z-velocity energy k epsilon time/iter
turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 91960 cells
18 5.9446e-02 5.1724e-03 3.2169e-03 3.2276e-03 1.6463e-05 1.0998e-02 3.0948e-02 16:24:45 10000
Error: divergence detected in AMG solver: epsilon
Error Object: ()
iter continuity x-velocity y-velocity z-velocity energy k epsilon time/iter
18 5.9446e-02 5.1724e-03 3.2169e-03 3.2276e-03 1.6463e-05 1.0998e-02 3.0948e-02 16:24:45 10000
reversed flow in 508 faces on outflow 5.
Error: divergence detected in AMG solver: x-momentum
Error Object: ()
iter continuity x-velocity y-velocity z-velocity energy k epsilon time/iter
18 5.9446e-02 5.1724e-03 3.2169e-03 3.2276e-03 1.6463e-05 1.0998e-02 3.0948e-02 16:24:45 10000
reversed flow in 508 faces on outflow 5.
Error: divergence detected in AMG solver: x-momentum
Error Object: ()
iter continuity x-velocity y-velocity z-velocity energy k epsilon time/iter
18 5.9446e-02 5.1724e-03 3.2169e-03 3.2276e-03 1.6463e-05 1.0998e-02 3.0948e-02 16:24:45 10000
reversed flow in 508 faces on outflow 5.
Error: divergence detected in AMG solver: x-momentum
Error Object: ()
iter continuity x-velocity y-velocity z-velocity energy k epsilon time/iter
18 5.9446e-02 5.1724e-03 3.2169e-03 3.2276e-03 1.6463e-05 1.0998e-02 3.0948e-02 16:24:45 10000
reversed flow in 508 faces on outflow 5.
Error: divergence detected in AMG solver: x-momentum
Error Object: ()
iter continuity x-velocity y-velocity z-velocity energy k epsilon time/iter
18 5.9446e-02 5.1724e-03 3.2169e-03 3.2276e-03 1.6463e-05 1.0998e-02 3.0948e-02 16:24:45 10000
reversed flow in 508 faces on outflow 5.
Error: divergence detected in AMG solver: x-momentum
Error Object: ()
iter continuity x-velocity y-velocity z-velocity energy k epsilon time/iter
18 5.9446e-02 5.1724e-03 3.2169e-03 3.2276e-03 1.6463e-05 1.0998e-02 3.0948e-02 16:24:45 10000
reversed flow in 508 faces on outflow 5.
Error: divergence detected in AMG solver: x-momentum
Error Object: ()
iter continuity x-velocity y-velocity z-velocity energy k epsilon time/iter
18 5.9446e-02 5.1724e-03 3.2169e-03 3.2276e-03 1.6463e-05 1.0998e-02 3.0948e-02 16:24:45 10000
reversed flow in 508 faces on outflow 5.
Error: divergence detected in AMG solver: x-momentum
Error Object: ()
iter continuity x-velocity y-velocity z-velocity energy k epsilon time/iter
turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 2 cells
18 5.9446e-02 5.1724e-03 3.2169e-03 3.2276e-03 1.6463e-05 1.0998e-02 3.0948e-02 16:24:45 10000
reversed flow in 508 faces on outflow 5.
temperature limited to 1.000000e+00 in 5 cells on zone 2
temperature limited to 5.000000e+03 in 9 cells on zone 3
turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 61 cells
19 1.4495e+03 3.1185e-01 2.2079e-01 2.4335e-01 1.9082e-05 2.7210e+00 1.1999e+06 16:27:42 9999
reversed flow in 499 faces on outflow 5.
Error: divergence detected in AMG solver: temperature
Error Object: ()
回复：（wangweishu）[求助]高手帮帮我！！
改小Under-Relaxation Factors中的步长看看 我理解“改小Under-Relaxation Factors中的步长看看” ，就是改小松弛因子吧，我试了所有的松弛因子都小于0.3，但还是不行。还有别的办法？？？？
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