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Transition 3d elements- Tet to Wedge/ Hexa

ms
Hi all
I need to allow the mesher to generate tet mesh in some complicate solid areas.; however, I need to join the interface with another solid created with hexa solids. (typical example- crankshaft with webs. the webs are tets, shaft with hex. I need some easy way of creating transition elements. Thanks
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    If you're looking for a pyramid-shaped element to transition (1 four-sided bottom and 4 three-sided faces) there isn't one in Patran.
     
    Assuming there is a shared, commonly shaped, and congruent interface between the two solids, one way you could approach it is by creating quad elements on top of the hex element face that interfaces the tetmeshed solid using Create/Element/Edit, , Shape:Quad, Topology:Quad4, Pattern: Face.
     
    Then you would need to break the quads created into trias using Modify/Quad/Split (I suggest the two triangle pattern).
     
    The trias would then need to be associated to the face of the solid that would be tetmeshed. Once this is done, that solid has to be remeshed with tets, which should pick up the pattern on the tria mesh.
     
    If it is successful, the quad and tria meshes can be deleted.
     
    You can also equivalence.
    Note that even though there will be a common node connection at the node vertices on the shared faces between hex and tet, there will also be element edge discontinuities where each square is broken into two triangles.
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  • 0
    If you're looking for a pyramid-shaped element to transition (1 four-sided bottom and 4 three-sided faces) there isn't one in Patran.
     
    Assuming there is a shared, commonly shaped, and congruent interface between the two solids, one way you could approach it is by creating quad elements on top of the hex element face that interfaces the tetmeshed solid using Create/Element/Edit, , Shape:Quad, Topology:Quad4, Pattern: Face.
     
    Then you would need to break the quads created into trias using Modify/Quad/Split (I suggest the two triangle pattern).
     
    The trias would then need to be associated to the face of the solid that would be tetmeshed. Once this is done, that solid has to be remeshed with tets, which should pick up the pattern on the tria mesh.
     
    If it is successful, the quad and tria meshes can be deleted.
     
    You can also equivalence.
    Note that even though there will be a common node connection at the node vertices on the shared faces between hex and tet, there will also be element edge discontinuities where each square is broken into two triangles.
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