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两个计算域（大的计算域内嵌套小的计算域），计算域交界面，Fluent中有interface和interior的边界条件，OpenFOAM中如何设置这种边界条件呢？
cfd-online.com/Forums/openfoam-pre-processing/116270-boundary-conditions-internal-faces.html
这篇叙述的挺详细的
