On 11/11/22 07:06, Alex Quinlan wrote:
Thanks very much for your reply. I'm happy to hear that you think my problems
can be resolved without too much difficulty. I'd like to try writing a patch
for the mixed 3D meshes. I have done some development work before, but I have
never sent it out of our group; your advice on writing the steps to write a
patch would be most welcome!
Alex:
At the most basic level, the steps to contribute patches is outlined here:
https://dealii.org/participate.html
Let me know if you have questions and I'll be happy to walk you through
whatever is missing in these documents.
I will re-review the relevant code and see if I can put together a general
plan on how to approach this.
And here too: Feel free to discuss it with me or here on this list.
For the specific code where you ended up with an exception: This is the place
where a finite element describes how the degrees of freedom on one of its
faces should interact with the degrees of freedom of the finite element on a
neighboring cell. For example, if you have a P1 and a P2 element on
neighboring cells (let's assume triangles for the moment), then the mid-edge
degree of freedom of the P2 element needs to have a specific value to ensure
that the resulting finite element field is continuous. In your situation, the
function has simply not been taught what these constraints should be if you
have a FE_SimplexP(1) element on a tetrahedron's triangular face meet the
degrees of freedom of a FE_WedgeP(1) or FE_PyramidP(1) on that common
triangular face. The answer is that the degrees of freedom should all be equal
to each other, as in some of the other cases handled by the function.
Best
Wolfgang
--
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Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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