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   定义需要网格精细化的部分

// - to specify refinement for any mesh cell inside/outside/near

// - to 'snap' the mesh boundary to the surface