Hi Martin, I have downloaded the sources via svn and also searched in the tgz nightly source snapshot, but there is neither a “benchmarks” directory nor a file called CubeAniso.geo. Could you tell me where to find it, or send it to me? A working example would be very helpful as I have no idea how to use anisotropy, and I am not going to delve in to the gmsh sources.
Thank you, Matthias Von: Zenker, Dr. Matthias [mailto:[email protected]] Gesendet: Donnerstag, 16. Februar 2012 15:42 An: 'Martin Vymazal'; [email protected] Betreff: Re: [Gmsh] anisostropic meshing / bamg algorithm Hi Martin, thanks for the pointers. I will try them out and may come back with more questions in 10 days or so (on vacation next week… ;) ) Matthias ---------------------------------------------------------------- Von: Martin Vymazal [mailto:[email protected]]<mailto:[mailto:[email protected]]> Gesendet: Donnerstag, 16. Februar 2012 14:21 An: [email protected]<mailto:[email protected]> Betreff: Re: [Gmsh] anisostropic meshing / bamg algorithm Hello Matthias, you can specify the entries of the mesh metric using a field which is called 'MathEvalAniso'. In case you have svn sources of gmsh, you can find an example using MathEvalAniso in GMSH_SOURCE_ROOT/benchmarks/3d/CubeAniso.geo The source code of this field is in Mesh/Field.[h/cpp] Some more examples concerning background fields and their usage are also available in gmsh reference manual. Best regards, Martin Vymazal On Thursday 16 February 2012 13:05:33 Zenker, Dr. Matthias wrote: Hi Martin, thank you for your answer. How do I define such an anisotropic mesh size field? Do you have a short example, or is this described somewhere? I did not find it in the Reference manual. Best regards, Matthias Von: Martin Vymazal [mailto:[email protected]]<mailto:[mailto:[email protected]]> Gesendet: Donnerstag, 16. Februar 2012 12:17 An: [email protected]<mailto:[email protected]> Betreff: Re: [Gmsh] anisostropic meshing / bamg algorithm Hello Matthias, you can use the bamg algorithm by calling 'gmsh -2 -algo bamg my_file.geo' from command line. For 3d anisotropic mesh, you do the same with '-3 -algo mmg3d'. You need to supply a mesh size field which will tell the anisotropic algorithm in which direction to refine the mesh. Best regards, Martin Vymazal On Thursday 16 February 2012 10:56:06 Zenker, Dr. Matthias wrote: Hi, does anyone have an answer to the question below? It was said that an anisotropic mesh can be achieved using the bamg algorithm. I have some questions: 1. My 3D geometry consists of several layers stacked in z direction. Some of these layers are rather thin. I would like to have a mesh which is finer in z direction than in x and y direction. Can this be achieved using the bamg algorithm? If so, how? 2. How can I access this algorithm from the GUI? I did not find it in Options – Mesh. 3. If not accessible from the GUI, how else can I use it? 4. Is there any documentation available concerning this topic? I did not find anything in the gmsh manual (which is from October 2010 btw). Thank you, Matthias ---------------------------------------------------------------- ERBE Elektromedizin GmbH Dr.rer.nat. Matthias Zenker Dipl. Phys. Grundlagenentwicklung / Fundamental Development Waldhoernlestrasse 17 72072 Tuebingen Germany Phone + 49 (0) 7071 755 - 226 Fax + 49 (0) 7071 755 - 5226 E-Mail: <mailto:[email protected]> URL: http://www.ERBE-med.com ---------------------------------------------------------------- _____________________________________________________________________ ERBE Elektromedizin GmbH Firmensitz: 72072 Tuebingen Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede Registergericht: Stuttgart HRB 380137 _____________________________________________________________________ ERBE Elektromedizin GmbH Firmensitz: 72072 Tuebingen Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede Registergericht: Stuttgart HRB 380137 _____________________________________________________________________ ERBE Elektromedizin GmbH Firmensitz: 72072 Tuebingen Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede Registergericht: Stuttgart HRB 380137 _____________________________________________________________________ ERBE Elektromedizin GmbH Firmensitz: 72072 Tuebingen Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede Registergericht: Stuttgart HRB 380137
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