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发表于 2010-4-18 09:54:14
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来自 韩国
4# 水若无痕
昨天笔下误,按照你的意见作了修改。
气体,在马赫数小于0.3的时候都是看做不可压缩的。如果考虑压缩出现收敛困难,那么肯定与马赫数较高很有关系。我不知道你所做问题的流速是多大,如果很大的话,在帮助文件中有这么两段话,可以做一下参考:
1. For transonic and supersonic flows, the most difficult flow regime is around Mach 1. If this is your flow regime of interest, you should first try a flow velocity lower or higher than Mach 1 and see how that converges. If this is successful, you can then modify your problem specification to your requirements and use the previous result as your initial value field
2. With increasing Mach number (Ma > 3), the accuracy of the wall-functions approach degrades, which can result in substantial errors in predicted shear stress, wall heat transfer and wall temperature for supersonic flows. |
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