[petsc-users] Generating data on dmplex with varying DOFs

[Prateek Gupta]

Thanks!
On a similar note, is it possible to define data on faces of a parallel
(distributed) dmplex? I have seen the example particular to finite volume
methods. But the examples I am building are block-spectral where each
element has a higher order polynomial running (much like spectral element
methods without the nuisance to separate edge modes and nodal modes).
What I am interested in is,

1. Define face data with multiple DOFs.

2. A quick way of exchanging this face data between processors for
calculating fluxes.

I have written all of this by hand already. Just wanted to check and
compare if dmplex would offer some performance improvement. Additionally,
petscFV could be extended to petscSD (SD stands for spectral difference),
where finite volume implementation is the zeroth order special case.

Thank you.
Sincerely,
Prateek Gupta, PhD


On Fri, Jul 15, 2022 at 5:43 PM Matthew Knepley <knepley at gmail.com> wrote:

> On Fri, Jul 15, 2022 at 7:08 AM Prateek Gupta <prateekgupta1709 at gmail.com>
> wrote:
>
>> Hi,
>> Is it possible to generate data using PetscSection with varying degrees
>> of freedom? I am building a sample example on a mixed grid (with both
>> hexahedra and tetrahedra) and thinking if it is possible to generate the
>> face data using PetscSection (or something else) on the resulting. The quad
>> faces have p*p data points and tri faces have p*(p-1)/2 data points.
>>
>
> Yes, you can set the size to whatever you want using
>
>   PetscSectionSetDof()
>   PetscSectionSetFieldDof()
>
> The DMPlexCreateSection() routine is overly simplistic here since I assume
> all k-cells have the same layout.
>
>   Thanks,
>
>      Matt
>
>
>> Thank you.
>> Sincerely,
>> Prateek Gupta, PhD
>>
> --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>
> https://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
>
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