snappyHexMeshDict 字典文件
// Geometry. Definition of all surfaces. All surfaces are of class
// searchableSurface.
// Surfaces are used
// - to specify refinement for any mesh cell intersecting it? ?定義需要網(wǎng)格精細化的部分
// - to specify refinement for any mesh cell inside/outside/near
// - to 'snap' the mesh boundary to the surface
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