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在User';s Guide里,讲Wall Roughness参数设置的最后一句:
Note that it is not physically meaningful to have a mesh size such that the wall-adjacent cell is smaller than the roughness height .
For best results,make sure that the distance from the wall to the centroid of the wall-adjacent cell is greater than Ks.
要得到好的结果,就需要保证近壁面单元的质心大于粗糙高度Ks。
可是,这样做的原因到底是什么呢? |
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