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<p>Dear Matthew,</p>
<p>Thank you so much. <br />I have a attached a small 8-noded quadrilateral mesh file (Version 4 ASCII) generated with gmsh 4.8.4. </p>
<p>Best wishes,<br />Susanne</p>
<p id="reply-intro">On 10.02.2022 16:23, Matthew Knepley wrote:</p>
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<div dir="ltr">On Thu, Feb 10, 2022 at 10:12 AM Susanne Claus <<a href="mailto:susanne.claus@onera.fr" rel="noreferrer">susanne.claus@onera.fr</a>> wrote:</div>
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<p>Hello,</p>
<p>I am using DMPlex for the mesh structure of a solid mechanics finite element code. I mainly use gmsh as input file format. When I try to read in 8-noded Quadrilaterals (Element type 16 in gmsh) DMPlex tells me that this element type is unknown. However a 9-noded Quadrilateral can be read without problem. On inspecting the plexgmsh.c source code I can see that 8-noded quadrilaterals are deactivated:</p>
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<a name="m_500319354635037670_line146"></a>146: {20, GMSH_TRI, 2, 3, 3, 9, NULL},
<a name="m_500319354635037670_line147"></a>147: {16, GMSH_QUA, 2, 2, 4, 8, NULL},<br /><br /><span style="font-family: verdana,geneva,sans-serif; font-size: 10pt;">For our application these 8-noded quadrilateral are very important. </span></pre>
<pre style="color: #000000; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; text-decoration-style: initial; text-decoration-color: initial;" width="80"><span style="font-family: verdana,geneva,sans-serif; font-size: 10pt;">Is there any reason why they have not been implemented/deactivated in the dmplex gmsh reader? </span></pre>
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<div>No, we can handle them in the same way I think. Let me look at it. Hopefully it is easy.</div>
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<div> Thanks,</div>
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<div> Matt</div>
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<pre style="color: #000000; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; text-decoration-style: initial; text-decoration-color: initial;" width="80"><span style="font-family: verdana,geneva,sans-serif; font-size: 10pt;">Thank you for all the great work you are doing. PETSc is amazing. </span><br /><br /><span style="font-family: verdana,geneva,sans-serif; font-size: 10pt;">Best wishes,</span><br /><span style="font-family: verdana,geneva,sans-serif; font-size: 10pt;">Susanne Claus </span></pre>
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<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>
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<div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank" rel="noopener noreferrer">https://www.cse.buffalo.edu/~knepley/</a></div>
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<p><img src="cid:3bb899cc22ffbad8f707be3717357bb5@onera.fr" alt="" width="138" height="31" /> </p>
<p><span style="color: #0000ff; font-size: 8pt;">Susanne Claus </span><br /><span style="color: #0000ff; font-size: 8pt;">Ingénieur Chercheur</span><br /><span style="color: #0000ff; font-size: 8pt;">Applied Mathematics and Scientific Computing Group</span><br /><span style="color: #0000ff; font-size: 8pt;">DTIS</span><br /><br /><span style="font-size: 8pt;">ONERA - The French Aerospace Lab </span><br /><span style="font-size: 8pt;">6 Chemin de la Vauve aux Granges, 91120 Palaiseau </span></p>
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