[petsc-users] How to construct DMPlex of cells with different topological dimension?

[Mark Adams]

>
>>    Is there anything wrong in my above consideration?  Any suggestions?
>>
>>         ------------
>>       /|             /|
>>      / |           /  |  cell 0: Hex
>>     /  |          /   |
>>    ------------/   |
>>    |   |         |   |
>>    |   |         |   |   cell 1: Quad
>>    |   --------|---|------------
>>    |  /          |  /             /
>>    | /           | /             /
>>    |/            |/             /
>>    -------------------------------------------
>>                                   cell 2: line
>>
>> Much thanks for your help.
>>
>
> If you are solving something where everything is embedded in a volumetric
> mesh, then there is no problem. However, if you really have
> the mesh above, where lower dimensional pieces are sticking out of the
> mesh, then Plex can represent the mesh, but automatic interpolation
> (creation of edges and faces) will not work.
>

Yuan: can you add a fake Hex over the hanging shell here? Give them zero
stiffness and constrain the hanging nodes that the fake elements create.
Mark
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