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比如现在有一个非常大的油箱，我想缩比之后计算。这个咋弄啊(^～^)，是不是要乘一个系数。
啥...网格画小一点不就行了？
缩小模型只能保证一个无量纲数相同，一般的流动考虑雷诺数就行，缩放会带来一些非真实的物理效应，但是计算量不够就不要讲究了
