[Gmsh] Crash at mesh3d for layred structure

[Zenker, Dr. Matthias]

Hi,

problem solved: since now I am not using the MathEvalAniso field any more, but a Threshold Field, I don't need the MMG3D algorithm. I can create a 2D mesh with the Bamg algorithm and do the 3D meshing with Delaunay, Frontal or the like. This is not anisotropic, but is OK for the current application.

Nevertheless I hope that MMG3D will be available for volumes with internal boundaries so that real anisotropic meshes can be created directly.
In the meantime, I use a trick consisting in blowing up the geometry anisotropically (e.g. in z direction), meshing isotropically and reshrinking the mesh to the original size of the geometry.

Matthias

> -----Ursprüngliche Nachricht-----
> Von: Christophe Geuzaine [mailto:cgeuzaine at ulg.ac.be]
> Gesendet: Freitag, 12. Juli 2013 18:46
> An: Zenker, Dr. Matthias
> Cc: gmsh at geuz.org; Jean François Remacle
> Betreff: Re: Crash at mesh3d for layred structure
>
>
> On 12 Jul 2013, at 14:25, "Zenker, Dr. Matthias" <Matthias.Zenker at erbe-
> med.com> wrote:
>
> > Hi,
> >
> > next attempt in my quest for meshing a layered structure. The goal is to
> have a refined mesh at one of the edges. This time I use a combination of an
> Attractor and a Threshold field, as suggested in demos/fields.geo in the gmsh
> distribution. I am still under gmsh 2.8.0 64bit, Windows 7.
> >
> > I have attached 2 examples. layers.geo has two layers and works (even
> though it takes a loong time). layers2.geo does the 2D mesh, but crashes
> when the 3D meshing is launched.
> >
> > Any suggestions/workarounds/bugfixes permitting to get a 3D mesh in
> > this structure (layers2.geo) which is refined around the lower edge of
> > the topmost layer are welcome... (And yes, I need 3 volumes since I want
> > to assign different properties to the layers in a simulation.)
>
> As said before and confirmed by Jean-François, the MMG3D interface is not
> ready for volumes with internal boundaries...
>
>
>
> >
> > Thank you, and have a nice weekend!
> >
> > Matthias
> >
> >
> >
> >
> >
> __________________________________________________________
> ___________
> > ERBE Elektromedizin GmbH
> > Firmensitz: 72072 Tuebingen
> > Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede
> > Registergericht: Stuttgart HRB 380137
> >
> > <layers.geo><layers2.geo>
>
> --
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://www.montefiore.ulg.ac.be/~geuzaine
>
>



_____________________________________________________________________
ERBE Elektromedizin GmbH
Firmensitz: 72072 Tuebingen
Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede
Registergericht: Stuttgart HRB 380137