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Matteo Semplice <matteo. semplice@ uninsubria. it> writes: >> The way that periodic coordinates work is that it stores a DG >> coordinate field by cell. Faces default back to the vertices. You >> could think about also
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<meta charset="utf-8"></head><body><pre style="font-family: sans-serif; font-size: 100%; white-space: pre-wrap; word-wrap: break-word">Matteo Semplice <matteo.semplice@uninsubria.it> writes:
>> The way that periodic coordinates work is that it stores a DG
>> coordinate field by cell. Faces default back to the vertices. You
>> could think about also putting DG coordinates on faces, but no one
>> had asked, and it is potentially expensive.
>>
>> If you really need them to keep going, face coordinates can be
>> extracted from cell coordinates. Otherwise, I can do it after the
>> PETSc Meeting. Or, we are happy to take contributions adding this.
>
> Hi.
>
> I mainly wanted to check that this was expected and not a result of a
> setup of my DM. No need to change Petsc now except maybe issuing a
> warning if the fallback to continuous coordinates will give wrong
> results. As for my code, I think I can extract the info from the cell
> coordinates in a pre-processing phase and if this crazy FV methods I am
> implementing will survive for long enough, I'll think about contributing.
You can also check out the "isoperiodic" example (src/dm/impls/plex/tests/ex49.c) if you want the semantic that donor and image points are separate points that map to the same global dofs. This avoids having any "DG coordinate field".
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