CFD Online Discussion Forums - [snappyHexMesh] Using addLayers to create boundary layers OUTside of the added .stl file

Hello foamers,

the title says it all I believe. I want to add a boundary layer on the outside of the .stl file that I'm adding to my mesh.

What I have tried so far is using SHM, splitting the mesh in two regions, then use SHM again with only addLayers activated and an entry for the second region. But it does not work like that. I believe there should be an easy command to solve my problem...

This is what my addLayersControls looks like right now:

Code:

addLayersControls                                            

{

    relativeSizes           true;



    minThickness            0.05;

    finalLayerThickness     0.5;

    expansionRatio            1.2;

    nGrow                           1;



    featureAngle                 90;

    slipFeaterAngle             30;

    nRelaxIter                      5;

    nSmoothSurfaceNormals     1;

    nSmoothNormals            3;

    nSmoothThickness       10;

    maxFaceThicknessRatio     0.5;

    maxThicknessToMedialRatio 0.3;

    minMedianAxisAngle     90;

    nBufferCellsNoExtrude     0;

    nLayerIter                   100;

     

    layers

        {

        fluid                

        {

        nSurfaceLayers 8;

        }

    }

}

The .stl that I added is stored in the cylinder region, the rest of the mesh is stored as fluid region.

Thank you already!
Vince