[Gmsh] Problem meshing 2 volumes
Christophe Geuzaine
cgeuzaine at ulg.ac.be
Wed May 9 11:34:50 CEST 2007
jordi poblet wrote:
> Thanks.
>
> My doubt has been clarified. I though that only the surfaces included in
> the surface loop were considered by the algorithm. I could not
> understand why the second volume was modifying the mesh of the first volume.
>
> I also had a similar problem with single volumes that are thin (like
> layers or shells not modelled using surface meshes) but I assumed that
> it was a normal error and I should use another meshing algorithm like an
> extrusion. I guess that it can also be related with the small distance
> between surfaces.
Yes, that's right. Your best bet in such cases is to use the Netgen
algorithm: due to its hybrid Delaunay/frontal nature, it will never
(provided that it converges...) change the original surface mesh.
>
>
> Jordi Poblet Puig
>
>
>
> On 5/9/07, *Christophe Geuzaine* <cgeuzaine at ulg.ac.be
> <mailto:cgeuzaine at ulg.ac.be>> wrote:
>
> Christophe Geuzaine wrote:
> >
> > Use a more recent version of Gmsh (version 2): the new algorithm does
> > not have this problem.
>
> More precisely, the new algorithm should not produce *invalid* meshes.
>
> But with the Delaunay the quality might still degrade when the distance
> is reduced, since the initial mesh is built using all the surfaces in
> the model (we don't process non-connected volumes separately at the
> moment with the Delaunay algorithm; we might introduce this as an
> enhancement later on.)
>
> Ch.
>
>
>
> >
> >
> >
> >
> >
> >> Thanks in advance,
> >>
> >> Jordi Poblet Puig
> >>
> >>
> >>
> >>
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>
> --
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://www.montefiore.ulg.ac.be/~geuzaine
>
>
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--
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine