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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Dear Florent,<br>
we have an example in MOAB, you can take a look<br>
It has to be modified to export just the boundary quads<br>
We usually run it in parallel for big meshes, and its output is in hdf5 format.<br>
<a href="http://ftp.mcs.anl.gov/pub/fathom/moab-docs/GenLargeMesh_8cpp-example.html" target="_blank">http://ftp.mcs.anl.gov/pub/fathom/moab-docs/GenLargeMesh_8cpp-example.html</a><br>
<br>
You can afterwards run mbconvert to export in exodus format<br>
mbconvert large.h5m large.exo<br>
We used this to generate billions of hexas, to test I/O<br>
<br>
our exodus is in serial, and never pushed it this high, but you could try<br>
<br>
geometry is very regular<br>
<br>
you can control though dx, dy, etc<br>
<br>
Would something like this work?<br>
<br>
Iulian<br>
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<div style="direction: ltr;" id="divRpF393876"><font face="Tahoma" color="#000000" size="2"><b>From:</b> De Martin Florent [F.DeMartin@brgm.fr]<br>
<b>Sent:</b> Friday, March 11, 2016 4:09 AM<br>
<b>To:</b> Grindeanu, Iulian R.; cgma-dev@mcs.anl.gov<br>
<b>Subject:</b> RE: CGM doc<br>
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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Dear Iulian,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D" lang="EN-US">Thank you for your prompt response and your advices.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D" lang="EN-US">To answer your questions, EFISPEC3D reads ExodusII mesh file generated by CUBIT. Boundary conditions are either free surface (made of QUAD) or
absorbing boundaries (made of QUAD). But unfortunately, the NetCDF API inside CUBIT fail to generate a mesh of 200+ millions of hexa. The mesh is very basic: only a cubic domain meshed by millions of hexa. So I was looking for an open-source code (CUBIT is
not) to generate such a mesh…</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D" lang="EN-US">Best regards,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D" lang="EN-US">Florent</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D" lang="EN-US"> </span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">De :</span></b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> Grindeanu, Iulian R. [mailto:iulian@mcs.anl.gov]
<br>
<b>Envoyé :</b> jeudi 10 mars 2016 17:00<br>
<b>À :</b> De Martin Florent; cgma-dev@mcs.anl.gov<br>
<b>Objet :</b> RE: CGM doc</span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:black">Hello,<br>
CGM alone would not be enough to generate a mesh<br>
CGM is mostly a wrapper around other geometry kernels, ACIS or OCC/OCE based.<br>
To generate a mesh you would need the SIGMA stack.<br>
<a href="http://sigma.mcs.anl.gov/" target="_blank"><span lang="EN-US">http://sigma.mcs.anl.gov/</span></a></span><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:black" lang="EN-US"><br>
<br>
I am not familiar with what format you need your mesh for EFISPEC3D; I assume it is similar to NEK5000 solver, which is a spectral element method too.
</span><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:black">(so Nek needs a hexahedral mesh)<br>
<br>
And what is the input geometry format? Terrain data? <br>
We have some capabilities developed for ice sheet modeling. At the core, they do need a quadrilateral mesher for surfaces, which are then extruded/swept to form hexahedral elements. Also, it is assumed that the domain of interest does not have internal caves/tunnels,
so the sweeping in vertical direction is trivial.<br>
<br>
I am not sure how these would help your project.<br>
<br>
Iulian</span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:black" lang="EN-US">From:</span></b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:black" lang="EN-US">
</span><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:black"><a href="mailto:cgma-dev-bounces@mcs.anl.gov" target="_blank"><span lang="EN-US">cgma-dev-bounces@mcs.anl.gov</span></a></span><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:black" lang="EN-US">
[cgma-dev-bounces@mcs.anl.gov] on behalf of De Martin Florent [F.DeMartin@brgm.fr]<br>
<b>Sent:</b> Thursday, March 10, 2016 9:19 AM<br>
<b>To:</b> </span><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:black"><a href="mailto:cgma-dev@mcs.anl.gov" target="_blank"><span lang="EN-US">cgma-dev@mcs.anl.gov</span></a></span><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:black" lang="EN-US"><br>
<b>Subject:</b> [cgma-dev] CGM doc</span><span style="color:black" lang="EN-US"></span></p>
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<p class="MsoNormal"><span style="color:black" lang="EN-US">Dear CGM support,</span><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:black"></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US"> </span><span style="color:black"></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US">I am interested to generate large scale finite element meshes for the spectral-element code EFISPEC3D (<a href="http://efispec.free.fr" target="_blank">http://efispec.free.fr</a>)</span><span style="color:black"></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US">I have downloaded (from git) and compiled CGM, but I can hardly find a user documentation. Would you please send it to me ?</span><span style="color:black"></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US"> </span><span style="color:black"></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US">Best regards,</span><span style="color:black"></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US">Florent DE MARTIN</span><span style="color:black"></span></p>
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