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fluent中density based求解器的压力出口边界有三种
1. Weak enforcement of average pressure (default) 2. Strong enforcement of average pressure 3. Direct pressure specification |
默认是弱形式1.适用于大多数的情况。
如果出口处给定的压力值和实际计算值有差距,
(一般由于出口网格给定的太稀疏),
可以用强形式2,或者直接形式3。
通过TUI界面可以进行修改
define/boundary-conditions/bc-settings/pressure-outlet |
几点说明:
1. 如果用了无反射边界条件NRBC ,则出口压力由NRBC决定。
When one of the NRBC model, none of the above specification methods are relevant since face pressure will be obtained from special NRBC procedures.
这个回答了我之前的一个疑惑。link。
2. 如果在出口设置了profile,需要用direct类型出口边界。
If you are specifying a profile rather than a constant value for exit pressure, then you should not use this weak or strong enforcement of average pressure boundary. Instead, you should use the direct pressure specification method.
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