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snappyHexMesh has problems if surface intersections are incompatible with volume assignment

  • shm baffles existing faces
  • on complex geometries this can give cells being disconnected i.e. forming a separate region
  • this gets resolved by assigning these regions to a connected neighbouring region
  • this can occasionally cause bleeding
  • an alternative method is to reset the connecting neighbouring region instead (through erosion)

EP 509.