[Talaat]

Hello everyone,

What free or opensource meshing software do you recommend for multiregion cases (conjugate heat transfer) and CAD imported geometry? I know about Salome but I am getting really poor meshes with it. The geometries I am using are complex and are difficult to construct with the utilities that come with OpenFOAM. Suggestions are appreciated.

[TobiF]

I'm working a lot with multi-region cases using salome for the surface-triangulation and snappyhexmesh for the mesh.

The touching surfaces of the different regions should have the same surface-triangulation, then shm works fine (definement is then your choice)

[Talaat]

Originally Posted by TobiF

I'm working a lot with multi-region cases using salome for the surface-triangulation and snappyhexmesh for the mesh.

The touching surfaces of the different regions should have the same surface-triangulation, then shm works fine (definement is then your choice)

But from what I read snappyHexMesh removes the cells on one side of the mesh. How could I create a multi-region mesh for conjugate heat transfer with snappyHexMesh? I need to keep the meshes on both sides but as two different zones/regions.

[TobiF]

That's not correct.
If you define cellZones in snappy then everything works as it should.

For that define in geometry-part

yourSTLFile.stl
    { 
    type     triSurfaceMesh;
    name   yourSTLFile;
    }

And in therefinementSurface where you usually define your patches use:

yourSTLFile
    {
        level (1 1); //or what refinement you want to
        faceZone              yourSTLFile;
        cellZone               yourSTLFile;
       cellZoneInside       inside;
    }

That will keep the inner and the outer cells and after snappyHexMesh use the splitMeshRegions -cellZones to create the single regions...

But what I told you now is not a secret - please have a look at the chtMultiRegionFoam - tutorial "snappyMultiRegionHeater".

Everything is shown in this tutorial

regards
Tobi