This Section describes snapphyHexMesh parameters defined in snappyHexHeshDict file and explains their meaning. Open the snappyHexHeshDict in system directory and go steb-by-step through the file:

// Which of the steps to run
castellatedMesh true;
snap true;
addLayers true;

• sf snappyHexMesh mesh generation consists of three main phases:
  • castellating phase – the background mesh is being gradually refined with respect to the input geometry and defined parameters; at the end of this phase, the cells which are out of the region to be meshed are deleted
  • snapping phase – this phase does not perform any cell refinement, it transforms and modifies cells to achieve best alignment with the input geometry
  • add layers phase – it adds a boundary layer
• Each phase can be enabled or disabled by appropriate keyword:
  • YES: true, yes, on
  • NO: false, no, off
• An example of results after each phase is depicted in Figure