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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If one layer of tetrahedra in the thin layer is OK for you, you can set the characteristic lengths at the corners, try different algorthms (Delaunay,
tetgen) and see if you get the mesh you want that way. If you really need anisotropic mesh width, then it depends on the actual state of the MMG3D algorithm, which I don’t know…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Matthias<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Von:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Drew D [mailto:drewd423@gmail.com]
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<b>Gesendet:</b> Dienstag, 7. Oktober 2014 14:37<br>
<b>An:</b> Zenker, Dr. Matthias<br>
<b>Cc:</b> Christophe Geuzaine; gmsh@geuz.org<br>
<b>Betreff:</b> Re: [Gmsh] Meshing stackup with thin & thick layers<o:p></o:p></span></p>
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<p class="MsoNormal">Thanks for the response, Dr. Zenker. So it doesn't sound like there is a good way to do what I want currently?<br>
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Drew<o:p></o:p></p>
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<p class="MsoNormal">On Tue, Oct 7, 2014 at 4:14 AM, Zenker, Dr. Matthias <<a href="mailto:Matthias.Zenker@erbe-med.com" target="_blank">Matthias.Zenker@erbe-med.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">AFAIK in Elmer you cannot assign a material to a surface in a 3D simulation, so you
need those very flat volumes.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">There is a 3D meshing algorithm in gmsh (MMG3D) which in principle allows anisotropic
mesh width. I have not succeeded in the past to get it working for a similar problem, as it was not available for volumes with internal boundaries. See the following post from the mailing list:
<a href="http://www.geuz.org/pipermail/gmsh/2013/008379.html" target="_blank">http://www.geuz.org/pipermail/gmsh/2013/008379.html</a>. This is a year ago, however, and things might have evolved since then.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">@Christophe: Have they…? ;)</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">HTH,</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Von:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Drew D [mailto:<a href="mailto:drewd423@gmail.com" target="_blank">drewd423@gmail.com</a>]
<br>
<b>Gesendet:</b> Montag, 6. Oktober 2014 14:52<br>
<b>An:</b> Christophe Geuzaine<br>
<b>Cc:</b> <a href="mailto:gmsh@geuz.org" target="_blank">gmsh@geuz.org</a><br>
<b>Betreff:</b> Re: [Gmsh] Meshing stackup with thin & thick layers</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Christophe,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks for the response. Don't I need to treat them as volumes so that I can assign them different materials in my solver? I'm using Elmer, btw.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Drew<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Mon, Oct 6, 2014 at 4:16 AM, Christophe Geuzaine <<a href="mailto:cgeuzaine@ulg.ac.be" target="_blank">cgeuzaine@ulg.ac.be</a>> wrote:<o:p></o:p></p>
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On 01 Oct 2014, at 22:23, Drew D <<a href="mailto:drewd423@gmail.com" target="_blank">drewd423@gmail.com</a>> wrote:<br>
<br>
> I have a composite stackup with alternating thin & thick layers. The thick ones are are rougly 10x the thickness of the thin ones, and the aspect ratio is on the order of 100:1. The mesh for something like this is always huge. Is there a way to treat the
thin layers as 2D shells, while keeping the thicker ones 3D? The model is being exported as a STEP file and brought into Gmsh.<br>
><br>
<br>
Just include the surfaces in your model; Gmsh generates conformal meshes so this internal surface can then be treated as a thin layer in your solver. If you need duplicated nodes on the surface (which Gmsh normally does not generate), you can run Plugin(Crack)
on the resulting mesh.<br>
<br>
<br>
> Thanks,<br>
> Drew<br>
> _______________________________________________<br>
> gmsh mailing list<br>
> <a href="mailto:gmsh@geuz.org" target="_blank">gmsh@geuz.org</a><br>
> <a href="http://www.geuz.org/mailman/listinfo/gmsh" target="_blank">http://www.geuz.org/mailman/listinfo/gmsh</a><br>
<span style="color:#888888"><br>
--<br>
Prof. Christophe Geuzaine<br>
University of Liege, Electrical Engineering and Computer Science<br>
<a href="http://www.montefiore.ulg.ac.be/~geuzaine" target="_blank">http://www.montefiore.ulg.ac.be/~geuzaine</a><br>
<br>
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