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近壁面网格长宽比本来就很大,如果用RANS计算,有的模型对近壁面y+要求很小,比如SST k-omega要求y+≈1,但是对x+或者z+基本没有明确的限制,为了减少网格数量,一般流向和展向的网格无量纲参数可以在百千量级,这样的话近壁面网格长宽比就会很大,也是可以正常计算的。