Advanced refinement technique

The necessity to refine area that sometimes require a complex shape can be satisfied through the usage of an STL file as a cellZone entry. First, define a closed STL file through “snappyHexMeshDict.geometry” then use this frame in the respective snappyHexMeshDict sector:

    ...

    refinementSurfaces
    {
        <closedSTLFileYouWantToRefine>
        {
            level (1 2);

            cellZone        <nameCellZone>;
            faceZone        <nameFaceZone>;
            cellZoneInside  inside;
        }
      
    …

    refinementRegions
    {
        <closeSTLFileYouWantToRefine>
        {
            mode   <mode>;            // can be "distance" , "inside" or "outside"
            levels ((0.000008 3));
        }
    }
    ...