[petsc-users] DMPlex in Fortran

Mike Michell mi.mike1021 at gmail.com
Thu Aug 25 11:52:34 CDT 2022

Hi, I am trying to find the function you commented,
DMPlexCreateInterpolator(), from DMPlex manual page, but I do not think
this function is visible. Any comment about this?

> On Fri, Jul 8, 2022 at 11:26 PM Mike Michell <mi.mike1021 at gmail.com>
> wrote:
>> I am using DMPlex for a code with written in Fortran in 2D and 3D. There
>> were two questions.
>> - As a follow up of the previous inquiry:
>> https://www.mail-archive.com/petsc-users@mcs.anl.gov/msg43856.html
>> Is the local-to-local halo exchange available in Fortran now or still
>> pending? Currently local-to-global and global-to-local communication are
>> used since local-to-local has not been allowed for Fortran.
> Sorry, it is still on my TODO list. I am trying to get stuff cleared out.
>> - One code solves discretized equations at each vertex, and another code
>> I want to couple physics is solving equations at each cell centroid.
>> Basically, the value at cell centroid needs to be mapped to vertex (or vice
>> versa) through interpolation/extrapolation for coupling of two codes. Does
>> petsc function provide this kind of mapping between cell centroid and
>> vertex? The grids for the two codes can be overlapped. I was trying to find
>> some FEM infrastructures in petsc, but so far havent found that kind of
>> functionality. Can I get any comments on that?
> Yes, you can create both P0 and P1 discretizations (PetscFECreateLagrange)
> in two different DMs using DMClone(), and then create an interpolation
> operator (DMPlexCreateInterpolator) which maps between them. Let me know if
> something is not clear there.
>   Thanks,
>     Matt
>> Thanks,
>> Mike
> --
> 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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