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crack at interface of hexahedron & tetrahedron mes

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Old   April 1, 2002, 16:52
Default crack at interface of hexahedron & tetrahedron mes
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KS
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Hello,

The geometry was meshed by using hexahedron meshes while a small part was meshed with tetrahedron meshes. At the interface of these two types of cells, cell faces match nicely. vmerge merged all multiple vertices. However there is a crack region all over the interface. I think this shouldn't be there. Anybody has any idea about this issue? Thanks in advance for any response.

KS
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Old   April 1, 2002, 21:43
Default Re: crack at interface of hexahedron & tetrahedron
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cjtune
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I think you need some kinda coupling, either arbitrary or integral. I use ICEM-CFD for creating hybrid meshes and at the interfaces beween the hexa and tetras, ICEM always creates pyramid elements for 1-to-1 connectivity. 1-to-1 as in cell surface, not just vertices. Note that you need at least 2 tets to cover any one side of a hex (2 triangles = 1 square). I can't comment on Pro*AM as I haven't used it for anything other than trimmed cell meshes.
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Old   April 2, 2002, 04:04
Default Re: crack at interface of hexahedron & tetrahedron
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cjtune
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You need a 1-to-1 match not only with the vertices but also with the surfaces. Since you can only cover on side of a hex (square) with two tets (triangles), I suggest you try arbitrary or integral coupling. If you want perfect matching, you need pyramids as intermediate cells between the hexs and the tets. I use ICEM-CFD for hybrid meshes and this is the way it matches hex and tet domains. Not sure about how Pro*AM handles hybrids meshes...
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Old   April 2, 2002, 04:07
Default Sorry, internet connection lag... (n/t)
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cjtune
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Old   April 2, 2002, 13:35
Default Re: crack at interface of hexahedron & tetrahedron
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steve
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You need to add cpmatches at the hex/tet interface. If they match exactly (ie 2 triangles to each quad face) then you can you integral cpmatches. If not then you need the arbitraries.
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