Hi Matthias, There are two separate problems:
1) Currently MMG3D does not like having internal surfaces in the volume. Attached is a file with a single volume, which works ok. @JF : have you tried MMG3D in such cases with internal surfaces? 2) "h2 / 100" pushes the initial tetrahedralization to the limit; h2/90 works fine over here. All of this is still very experimental, though. It all needs to be tested and documented. Thanks for the feedback! Christophe
layers.geo
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On 11 Jul 2013, at 17:29, "Zenker, Dr. Matthias" <[email protected]> wrote: > I forgot to say that the crash happens under Windows 7 with gmsh 2.8.0 64bit > and with 2.7.1 32bit and 64bit. > > Matthias > > _____________________________________________ > Von: Zenker, Dr. Matthias > Gesendet: Donnerstag, 11. Juli 2013 16:57 > An: '[email protected]' > Cc: 'Christophe Geuzaine [[email protected]] ([email protected])' > Betreff: crash on 3D meshing (AW: Anisiotropic mesh in stacked layers) > > > Hi, > > now that I have successfully created a anisotropic mesh width field for my > geometry, I get a crash when I do the 3D meshing. 2D meshing works without > problem. I have the impression that the desired mesh width may be too small. > Is this so, and what is the smallest mesh width gmsh can cope with? > > Thanks for an answer, this time… > > Matthias > > < Datei: layers.geo >> > _____________________________________________ > Von: Zenker, Dr. Matthias > Gesendet: Donnerstag, 11. Juli 2013 16:41 > An: '[email protected]' > Cc: 'Christophe Geuzaine [[email protected]] ([email protected])' > Betreff: AW: Anisiotropic mesh in stacked layers > > > Hi again, > > I have got it to work, but I still don’t understand why. It seems that the > fields in MathEvalAniso have to be 1/(mesh_width)^2. But why? > I have read the relevant part of the gmsh manual, but didn’t find the answer > there. > A short explanation and/or a pointer to more info would be highly appreciated. > > Matthias > > _____________________________________________ > Von: Zenker, Dr. Matthias > Gesendet: Mittwoch, 10. Juli 2013 17:09 > An: [email protected] > Cc: Christophe Geuzaine [[email protected]] ([email protected]) > Betreff: Anisiotropic mesh in stacked layers > > > Hi, > > I want to mesh a geometry with layers stacked in z direction, where each > layer should have a mesh width in the xy plane, and a different one in z > direction. I have tried to combine the Box, Min and MathEval Aniso fields to > achieve this (see attachment). But the mesh widths are not as I expect, in > particular in layer 2 in z direction it should be 1/20 its height. What do I > do wrong? > How is the mesh width derived from the m11, m22 and m33 fields in > MathEvalAniso? > > Thanks for some explanations and hints, > > Matthias > > < Datei: layers.geo >> > > > > _____________________________________________________________________ > ERBE Elektromedizin GmbH > Firmensitz: 72072 Tuebingen > Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede > Registergericht: Stuttgart HRB 380137 > > <layers.geo> -- Prof. Christophe Geuzaine University of Liege, Electrical Engineering and Computer Science http://www.montefiore.ulg.ac.be/~geuzaine
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