[twinturbotom]

All, I'm writing to gain a better understanding of creating internal patches from snappyHexMesh. I have been using the snappyMultiRegionHeater tutorial in conjunction with a few other snappy / external flow cases.

I would like to know how you typically define patches when using snappy

I am currently having trouble getting all of the target cells into an internal patch (sometimes I get 10 out of 100 cells).

I have a piece of equipment exhausting gas in a large surrounding environment.

The exhaust input to the domain is represented as a surface (zero thickness) on one of the faces of the equipment (large box).

geometry
{
    equipment.stl
    {
        type triSurfaceMesh;
        name equipment;
        scale 0.001;
        regions
        {
            equipment
            {
                name equipment;
            }
            exhaust // Sometimes this is a separate stl
            {
                name exhaust;
            }
        }
    }

    refinementSurfaces
    {
        equipment
        {
            level (4 4);
            patchInfo { type wall; }
        }
        exhaust
        {
            level (4 4);
            patchInfo { type patch;}
            faceZone exhaust;
            cellZone exhaust;
            cellZoneInside inside;
        }

After I run splitMeshRegion (with options for -useFaceZone or not) I get an output showing no zones are found and / or I have several but not all of the cells making up the exhaust.

Is this an stl tolerance issue? Am I missing a few steps or files in the process (createPatch, createBaffles, setSet topoSet,..etc.)?

Thanks for the help!

[twinturbotom]

Works with no overlap, is a non overlap a requirement?