[Gmsh] Negative Jacobians in 2nd Order Mesh

[Nikhil Vaidya]

Thanks, I'll check it out.

Best,
Nikhil

On Thu, Nov 26, 2020, 12:53 PM Christophe Geuzaine <cgeuzaine at uliege.be>
wrote:

>
>
> > On 23 Nov 2020, at 11:19, Nikhil Vaidya <nikhilvaidya91 at gmail.com>
> wrote:
> >
> > I changed my geometry slightly, and the negative jacobians problem has
> returned. Is there some general second-order meshing workflow (involving
> smoothing steps) one can follow to avoid this problem?
>
> "-optimize_ho" applies the default strategy (elastic smoothing followed by
> brute-force optimization). See all the "HighOrder" options to fine-tune the
> parameters. With the API you can also call all the steps individually.
>
> Christophe
>
> >
> > Best,
> > Nikhil
> >
> > On Sat, Sep 5, 2020 at 7:32 AM Stephen Wornom <stephen.wornom at inria.fr>
> wrote:
> >
> > Hello
> > Please let the list know if
> > > Try the high-order mesh optimizer: "-optimize_ho" on the command line.
> > fixed the problem,
> > Stephen
> >
> >
> >
> > ----- Original Message -----
> > > From: "Christophe Geuzaine" <cgeuzaine at uliege.be>
> > > To: "Nikhil Vaidya" <nikhilvaidya91 at gmail.com>
> > > Cc: "gmsh" <gmsh at onelab.info>
> > > Sent: Friday, September 4, 2020 2:19:36 PM
> > > Subject: Re: [Gmsh] Negative Jacobians in 2nd Order Mesh
> >
> > >> On 4 Sep 2020, at 13:49, Nikhil Vaidya <nikhilvaidya91 at gmail.com>
> wrote:
> > >>
> > >> Hello,
> > >>
> > >> I have a geometry for which 1st order tetrahedral meshing works fine
> (with no
> > >> negative jacobians). For the 2nd order case, I get a few negative
> jacobians.
> > >> This problem does not go away even when I try to regularize the mesh
> or reduce
> > >> mesh sizes in certain regions with small geometric features.
> > >>
> > >> Does someone have a suggestion?
> > >
> > Hello
> > >
> > > Christophe
> > >
> > >>
> > >> Best regards,
> > >> Nikhil
> > >> _______________________________________________
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> > >> gmsh at onelab.info
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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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> > _______________________________________________
> > gmsh mailing list
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>
> —
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://people.montefiore.ulg.ac.be/geuzaine
>
>
>
>
>
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