> On Sep 22, 2024, at 07:26, Blaise Bourdin <bour...@mcmaster.ca> wrote: > > > >> On Sep 21, 2024, at 9:54 AM, neil liu <liufi...@gmail.com >> <mailto:liufi...@gmail.com>> wrote: >> >> Caution: External email. >> >> Thanks a lot, David. That works. >> Then I tried another example from Cubit. The script is defined as follows, >> >> reset >> brick x 1 >> mesh vol 1 >> block 1 volume 1 >> sideset 1 surface 1 >> block 2 surface 1 #sides of these elements can now be referenced in a sideset >> block 2 element type quad >> sideset 2 curve 1 >> >> Then the mesh was exported as a exodus file (attached), and imported into >> Petsc. >> Here, the code was stuck by the function, DMPlexCreateExodus(). >> I think maybe this is due to block 1 is 3D while block 2 is 2D. >> But this seems necessary to define an edge using sideset. > > > That is corrrect. > As far as I understand, one of the few assumptions in dmplex is that “cells” > have the same topological dimension > Here sideset 1 and 2 have different dimensions. > As far as I remember, exodusII does not have “Edge sets”, so your best bet > would be to define a node set for curve 1.
I have not seen the concept of edge sets discussed in the official exodusII doc [1]. However, they have an enum called ex_entity_type which does have a EX_EDGE_SET [2] value :thinking: IDK, how much developed that is. I have not used this myself. Most codes I have seen just use SIDE/NODE sets… Just sharing something I recently spotted… [1] https://urldefense.us/v3/__https://sandialabs.github.io/seacas-docs/exodusII-new.pdf__;!!G_uCfscf7eWS!ZXJZphkaSn_4MhiE6JwD78s0zYdnwitEqgRtuh997d8-EpF-ebRBxfAqlqjCsPAyPs6UAv6MOex2ksU4efI$ [2] https://urldefense.us/v3/__https://sandialabs.github.io/seacas-docs/html/exodusII_8h.html*a1f649ed288d305ab55773ffd1d220490__;Iw!!G_uCfscf7eWS!ZXJZphkaSn_4MhiE6JwD78s0zYdnwitEqgRtuh997d8-EpF-ebRBxfAqlqjCsPAyPs6UAv6MOex2PdimBKk$ — David > > Regards, > Blaise > >> >> Thanks, >> >> Xiaodong >> >> On Fri, Sep 20, 2024 at 3:15 PM David Andrs <and...@gmail.com >> <mailto:and...@gmail.com>> wrote: >>> Before you export the mesh from Cubit, change the element type to something >>> like QUAD4. PETSc does not automatically remap SHELL elements to QUADs. >>> >>> -- >>> David >>> >>> On Fri, Sep 20, 2024 at 8:05 AM neil liu <liufi...@gmail.com >>> <mailto:liufi...@gmail.com>> wrote: >>>> Dear Petsc developers and users, >>>> >>>> I am trying to read an exodus II file from coreform cubit, but without >>>> success, >>>> Then I used petsc's built-in exodus file, >>>> /share/petsc/datafiles/meshes/sevenside.exo. >>>> This file can be read by petsc successfully. >>>> >>>> And I did a test. This file, sevenside.exo, is imported into coreform >>>> Cubit, and then is saved as a new exodus file. This new exodus file can >>>> not be read by petsc successfully. >>>> >>>> [0]PETSC ERROR: Invalid argument >>>> [0]PETSC ERROR: Unrecognized element type SHELL >>>> [0]PETSC ERROR: See >>>> https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!ZXJZphkaSn_4MhiE6JwD78s0zYdnwitEqgRtuh997d8-EpF-ebRBxfAqlqjCsPAyPs6UAv6MOex2BOTP4BI$ >>>> >>>> <https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!fcN-KL0rs3WRHNRfT47zioS4djjyXM7OCr32LT2olmZHm3X1NIk-WMdU9-UR3rNotQSpINEm8NrcMtWTCFqKEg$> >>>> for trouble shooting. >>>> [0]PETSC ERROR: Petsc Release Version 3.21.1, Apr 26, 2024 >>>> [0]PETSC ERROR: ./app on a arch-linux-c-opt named localhost.localdomain by >>>> xiaodongliu Fri Sep 20 09:36:16 2024 >>>> [0]PETSC ERROR: Configure options -download-mumps -download-scalapack >>>> --with-cc=gcc --with-fc=gfortran --with-cxx=g++ --download-fblaslapack >>>> --download-mpich --with-scalar-type=complex --download-triangle >>>> --with-debugging=no --download-parmetis --download-metis >>>> -download-ptscotch --download-bison --download-hdf5 >>>> -download-mmg=/home/xiaodongliu/Documents/3rdPartyLib/d5c43d1bcefe598d51428f6a7fee10ec29478b79.tar.gz >>>> --download-ctetgen --download-pragmatic --download-eigen >>>> --download-netcdf=/home/xiaodongliu/Documents/3rdPartyLib/netcdf-c-4.9.2-p1.tar.gz >>>> --download-zlib --download-pnetcdf --download-exodusii >>>> [0]PETSC ERROR: #1 ExodusGetCellType_Internal() at >>>> /home/xiaodongliu/Documents/petsc-with-docs-3.21.1/petsc-3.21.1/src/dm/impls/plex/plexexodusii.c:1470 >>>> [0]PETSC ERROR: #2 DMPlexCreateExodus() at >>>> /home/xiaodongliu/Documents/petsc-with-docs-3.21.1/petsc-3.21.1/src/dm/impls/plex/plexexodusii.c:1551 >>>> [0]PETSC ERROR: #3 DMPlexCreateExodusFromFile() at >>>> /home/xiaodongliu/Documents/petsc-with-docs-3.21.1/petsc-3.21.1/src/dm/impls/plex/plexexodusii.c:1390 >>>> >>>> Thanks a lot. >>>> >>>> Xiaodong >>>> Compose: >>>> Inquiry about reading an exodus II file from coreform Cubit >>>> >>>> >>>> PETSc users list >>>> >> <test.e> > > — > Canada Research Chair in Mathematical and Computational Aspects of Solid > Mechanics (Tier 1) > Professor, Department of Mathematics & Statistics > Hamilton Hall room 409A, McMaster University > 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada > https://urldefense.us/v3/__https://www.math.mcmaster.ca/bourdin__;!!G_uCfscf7eWS!ZXJZphkaSn_4MhiE6JwD78s0zYdnwitEqgRtuh997d8-EpF-ebRBxfAqlqjCsPAyPs6UAv6MOex2EiOeyPQ$ > | +1 (905) 525 9140 ext. 27243
