[Gmsh] Nonconformal mesh (AW: import external-generated geometry in gmsh)

[Christophe Geuzaine]

On 01 Feb 2013, at 09:56, "Zenker, Dr. Matthias" <Matthias.Zenker at erbe-med.com> wrote:

> Hi,
>  
> the problem of nonconformal mesh at volume interfaces is still not resolved (see old posts below); the “cut and merge faces” algorithm works only in simple cases. I would like to know if there is work going on to solve this problem within gmsh. A full solution would have to be able to treat partially overlapping faces of arbitrary shape.
>  
> What is your point of view regarding this problem?
>  

Nothing new for us on that front... (unfortunately)



> Thank you,
>  
> Matthias
>  
> ----------------------------------------------------------------
> Von: Zenker, Dr. Matthias 
> Gesendet: Mittwoch, 26. September 2012 13:05
> An: 'Jean-François Remacle'
> Cc: gmsh at geuz.org
> Betreff: AW: [Gmsh] import external-generated geometry in gmsh
>  
> Hi,
>  
> the problem of nonconformal mesh at volume interfaces is really annoying.
>  
> I have tried to find a solution by processing a surface mesh with a scilab script, cutting and merging duplicated interfaces, redefining the volumes and doing the 3D mesh in gmsh. My tool is not mature yet since the handling of partially overlapping surfaces is not working like it should. But it works for duplicated surfaces which are identical, even in cases when the “cut and merge faces” recently implemented in gmsh fails.
>  
> Do I understand correctly from the message below (“We can imagine to modify the algorithm and mesh series of connected volumes together.”) that there is a solution within gmsh in sight? Is there actually work going on at this field?
>  
> If I can contribute to a solution, I would be glad to do so.
>  
> Best regards,
>  
> Matthias
>  
>  
> Von: Jean-François Remacle [mailto:jean-francois.remacle at uclouvain.be] 
> Gesendet: Mittwoch, 26. September 2012 11:10
> An: Stefan.Kremer at Schoeck.de
> Cc: gmsh at geuz.org
> Betreff: Re: [Gmsh] import external-generated geometry in gmsh
>  
>  
> Le 25 sept. 2012 à 08:59, Stefan.Kremer at Schoeck.de a écrit :
>  
> Hello Prof. Geuzaine 
> hello Prof. Remacle, 
> 
> i have a question to your great tool gmsh: 
> 
> Is there any possibility to generate a three-dimensional geometry (with several domains (=different materials) with an external software 
> then import and mesh it with gmsh?
> 
>  
> Yes : we handle STEP, BREP and IGES inputs.
>  
> I have tried this with freeCAD and exported a brep-file of my geometry but the problem is that common faces of volume bodies in the geometry 
> was saved twice (each belongs to one domain) and so the gmsh' mesh-algorithmus was not able to mesh the domains correctly.
> 
>  
> It is possible that freecad outputs volumes that have one face in common and that face is duplicated. In this case, our basic 3D mesh
> actually fails because all volumes are meshed together and this particular situation generates duplicated points. We can imagine to
> modify the algorithm and mesh series of connected volumes together. Another way is to save volumes separately with freecad, mesh
> them and merge meshes.
>  
> Maybe there is another way, generating a 3D-geometry (should be scriptable) and match the domains with material properties so that getdp could solve the problem. 
> 
> Do you have any ideas or hints? 
> 
> Thanks in advance for your help 
> 
> Best regards from south-germany 
> Stefan Kremer 
> 
> 
> Dipl.-Phys. Stefan Kremer 
> Strategic Productmanagement 
> 
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> ------------------------------------------------------------------
> Prof. Jean-Francois Remacle
> Universite catholique de Louvain (UCL)
> Ecole Polytechnique de Louvain (EPL) - Louvain School of Engineering
> Institute of Mechanics, Materials and Civil Engineering (iMMC)
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine