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On Tue, Jun 25, 2024 at 4: 50 AM onur. notonur via petsc-users <petsc-users@ mcs. anl. gov> wrote: Hi, I'm trying to implement a Tetgen mesh importer for my Petsc/DMPlex-based solver. I am encountering some issues and suspect they might
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<div dir="ltr"><div dir="ltr">On Tue, Jun 25, 2024 at 4:50 AM onur.notonur via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg2380158508772164299">
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Hi, I'm trying to implement a Tetgen mesh importer for my Petsc/DMPlex-based solver. I am encountering some issues and suspect they might be due to my import process. The Tetgen mesh definitions can be found here for reference: https: //wias-berlin. de/software/tetgen/fformats. htmlI
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<div style="font-family:Arial,sans-serif;font-size:14px"><span style="font-size:10.5pt;line-height:normal"></span></div><div style="line-height:30px"><span style="line-height:normal;font-family:Arial,sans-serif;font-size:14px;font-weight:400">Hi, </span><div><span style="font-family:Arial,sans-serif;font-size:14px;line-height:normal;font-weight:400"><br></span></div><div><span style="font-family:Arial,sans-serif;font-size:14px;line-height:normal;font-weight:400">I'm trying to implement a Tetgen mesh importer for my Petsc/DMPlex-based solver. I am encountering some issues and suspect they might be due to my import process. The Tetgen mesh definitions can be found here for reference: <span><a rel="noreferrer nofollow noopener" href="https://urldefense.us/v3/__https://wias-berlin.de/software/tetgen/fformats.html__;!!G_uCfscf7eWS!c6srXdHHqgkq5FoeJpfHljLrP0U3UJOmz6A1-jLgkMBEtv8NTqRKgVTgoP_ArdJT5e5kx9lX53ecjbzZ3iu3-eoV4-Qq_g$" target="_blank">https://wias-berlin.de/software/tetgen/fformats.html</a></span></span></div><div><span style="font-family:Arial,sans-serif;font-size:14px;line-height:normal;font-weight:400"><br></span></div><div><span style="font-family:Arial,sans-serif;font-size:14px;line-height:normal;font-weight:400">I am building DMPlex using the DMPlexBuildFromCellList function and using the exact ordering of nodes I get from the Tetgen mesh files (.ele file). The resulting mesh looks good when I export it to VTK, but I encounter issues when solving particular PDEs. (I can solve them while using other importers I write) I suspect there may be orientation errors or something similar.</span></div><span style="font-family:Arial,sans-serif;font-size:14px;line-height:normal;font-weight:400"><div style="line-height:30px"><span style="font-family:Arial,sans-serif;font-size:14px;line-height:normal;font-weight:400"><br></span></div>So, my question is, Is the ordering of nodes in elements important for tetrahedral elements while using DMPlexBuildFromCellList? If so, how should I arrange them?</span></div></div></blockquote><div><br></div><div>Yes, TetGen inverts tetrahedra compared to Plex, since I use all outward facing normals, whereas those in TetGen are not consistently ordered. However, why not just use DMPlexGenerate() with TetGen?</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg2380158508772164299"><div style="line-height:30px"><font face="Arial, sans-serif">Thanks,</font></div><div style="line-height:30px"><font face="Arial, sans-serif">Onur</font></div><div style="line-height:30px"><span style="font-family:Arial,sans-serif;font-size:14px;line-height:normal;font-weight:400"><br></span></div>
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</div></blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener</div><div><br></div><div><a href="https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!fZrK2yb2VL8fOhEwFSop4QgqPuB1M2_C1OMkfebpI6V32422apR69VnseJBVL8CTE5Gn4r6jRSz7K8DmkxpU$" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>