[petsc-users] DMPlex and CGNS

[Ferrand, Jesus A.]

Dear PETSc team:

I would like to use DMPlex to partition a mesh stored as a CGNS file. I configured my installation with --download_cgns = 1, got me a .cgns file and called DMPlexCreateCGNSFromFile() on it. Doing so got me this error:

[0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
[0]PETSC ERROR: Error in external library
[0]PETSC ERROR: CGNS file must have a single section, not 4
[0]PETSC ERROR: See https://petsc.org/release/faq/ for trouble shooting.
[0]PETSC ERROR: Petsc Release Version 3.18.3, unknown
[0]PETSC ERROR: ./program.exe on a arch-linux-c-debug named F86 by jesus Mon Jan 16 17:25:11 2023
[0]PETSC ERROR: Configure options --download-mpich=yes --download-hdf5=yes --download-cgns=yes --download-metis=yes --download-parmetis=yes --download-ptscotch=yes --download-chaco=yes --with-32bits-pci-domain=1
[0]PETSC ERROR: #1 DMPlexCreateCGNS_Internal() at /home/jesus/Desktop/JAF_NML/3rd_Party/PETSc/petsc/src/dm/impls/plex/cgns/plexcgns2.c:104
[0]PETSC ERROR: #2 DMPlexCreateCGNS() at /home/jesus/Desktop/JAF_NML/3rd_Party/PETSc/petsc/src/dm/impls/plex/plexcgns.c:60
[0]PETSC ERROR: #3 DMPlexCreateCGNSFromFile_Internal() at /home/jesus/Desktop/JAF_NML/3rd_Party/PETSc/petsc/src/dm/impls/plex/cgns/plexcgns2.c:27
[0]PETSC ERROR: #4 DMPlexCreateCGNSFromFile() at /home/jesus/Desktop/JAF_NML/3rd_Party/PETSc/petsc/src/dm/impls/plex/plexcgns.c:29

I looked around mail archives for clused and found this one (https://lists.mcs.anl.gov/pipermail/petsc-users/2018-June/035544.html). There, Matt provides a link to the source code for DMPlexCreateCGNSFromFile() and another (seemingly broken) link to CGNS files that can be opened with the former.  After reading the source code I now understand that it is hardcoded for CGNS files that feature a single "base" and a single "section", whatever those are.

After navigating the CGNS documentation, I can sympathize with the comments in the source code.

Anyhow, I wanted to ask if I could be furnished with one such CGNS file that is compatible with DMPlexCreateCGNSFromFile() to see if I can modify my CGNS files to conform to it. If not, I will look into building the DAG myself using DMPlex APIs.


Sincerely:

J.A. Ferrand

Embry-Riddle Aeronautical University - Daytona Beach FL

M.Sc. Aerospace Engineering

B.Sc. Aerospace Engineering

B.Sc. Computational Mathematics


Phone: (386)-843-1829

Email(s): ferranj2 at my.erau.edu

    jesus.ferrand at gmail.com
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