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[求助] 关于平均风压系数和净风压的讨论

请问用FLUENT计算风压的时候,参考位置应该设置在哪呢,(x,y,z)应该怎么确定?参考位置的作用是什么?为什么我改变参考点时风压结果也会相应改变?
还有怎么计算净风压系数的等值线云图,怎么上表面减下表面的值???
FLUENT的后处理中怎么通过分区求不同区域的体型系数?
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