[alexm]

Hello All,

I would like to use OpenFOAM for shiptank-modeling, now after using icoFoam and turbFoam, with rasInterFoam. Now my actual problem, where I stuck, is to create a sharp interface in the model-mesh, which should act as boundary-surface of the two phases in the rasInterFoam case.

First with blockMesh I created a hexahedronal quadratic mesh with the dimensions of the tank. The ship-hull is available as a geometry in iges or step format. Gmesh (http://www.geuz.org/gmsh/) creates a triangular surface mesh out of this, which is saved as STL-File.

These parts are needed by snappyHexMesh to build the desired mesh of the model area. So far, this works fine (nevertheless until now not all arguments are perfectly understood by me) but the resulting mesh is satisfactory - for single phase modeling the top patch is set to the water-level, the part of the hull that lies over the surface will be truncated.

But for 2 phase modeling I think an internal face or patch is needed, which marks the water-level and separates these phases in the resulting mesh.

So far I've tried a lot of things. The last had been using snappyHexMesh first with the water-phase, then the same with the air-phase, then merging these resulting meshes with 'mergeMeshes' - but at last stitchMesh failed.

Now I hope, that someone here has an idea, suggestion or a solution for my problem.
Something like a "How-To" for creating an boundary layer between two phases for usage in snappyHexMesh would be great.
(what about the layer sub-dict in the snappyHexMeshDict? but here an internal face is needed?)

Maybe there is a simple apparently solution, but I can't see it ...

Thanks in advance for your help!

bye and greetings, Axel