<div dir="auto">Thanks, I'll check it out. <div dir="auto"><br></div><div dir="auto">Best,</div><div dir="auto">Nikhil</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Nov 26, 2020, 12:53 PM Christophe Geuzaine <<a href="mailto:cgeuzaine@uliege.be">cgeuzaine@uliege.be</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
<br>
> On 23 Nov 2020, at 11:19, Nikhil Vaidya <<a href="mailto:nikhilvaidya91@gmail.com" target="_blank" rel="noreferrer">nikhilvaidya91@gmail.com</a>> wrote:<br>
> <br>
> 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?<br>
<br>
"-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.<br>
<br>
Christophe<br>
<br>
> <br>
> Best,<br>
> Nikhil<br>
> <br>
> On Sat, Sep 5, 2020 at 7:32 AM Stephen Wornom <<a href="mailto:stephen.wornom@inria.fr" target="_blank" rel="noreferrer">stephen.wornom@inria.fr</a>> wrote:<br>
> <br>
> Hello<br>
> Please let the list know if <br>
> > Try the high-order mesh optimizer: "-optimize_ho" on the command line.<br>
> fixed the problem,<br>
> Stephen<br>
> <br>
> <br>
> <br>
> ----- Original Message -----<br>
> > From: "Christophe Geuzaine" <<a href="mailto:cgeuzaine@uliege.be" target="_blank" rel="noreferrer">cgeuzaine@uliege.be</a>><br>
> > To: "Nikhil Vaidya" <<a href="mailto:nikhilvaidya91@gmail.com" target="_blank" rel="noreferrer">nikhilvaidya91@gmail.com</a>><br>
> > Cc: "gmsh" <<a href="mailto:gmsh@onelab.info" target="_blank" rel="noreferrer">gmsh@onelab.info</a>><br>
> > Sent: Friday, September 4, 2020 2:19:36 PM<br>
> > Subject: Re: [Gmsh] Negative Jacobians in 2nd Order Mesh<br>
> <br>
> >> On 4 Sep 2020, at 13:49, Nikhil Vaidya <<a href="mailto:nikhilvaidya91@gmail.com" target="_blank" rel="noreferrer">nikhilvaidya91@gmail.com</a>> wrote:<br>
> >> <br>
> >> Hello,<br>
> >> <br>
> >> I have a geometry for which 1st order tetrahedral meshing works fine (with no<br>
> >> negative jacobians). For the 2nd order case, I get a few negative jacobians.<br>
> >> This problem does not go away even when I try to regularize the mesh or reduce<br>
> >> mesh sizes in certain regions with small geometric features.<br>
> >> <br>
> >> Does someone have a suggestion?<br>
> > <br>
> Hello<br>
> > <br>
> > Christophe<br>
> > <br>
> >> <br>
> >> Best regards,<br>
> >> Nikhil<br>
> >> _______________________________________________<br>
> >> gmsh mailing list<br>
> >> <a href="mailto:gmsh@onelab.info" target="_blank" rel="noreferrer">gmsh@onelab.info</a><br>
> >> <a href="http://onelab.info/mailman/listinfo/gmsh" rel="noreferrer noreferrer" target="_blank">http://onelab.info/mailman/listinfo/gmsh</a><br>
> > <br>
> > —<br>
> > Prof. Christophe Geuzaine<br>
> > University of Liege, Electrical Engineering and Computer Science<br>
> > <a href="http://www.montefiore.ulg.ac.be/~geuzaine" rel="noreferrer noreferrer" target="_blank">http://www.montefiore.ulg.ac.be/~geuzaine</a><br>
> > <br>
> > <br>
> > <br>
> > <br>
> > _______________________________________________<br>
> > gmsh mailing list<br>
> > <a href="mailto:gmsh@onelab.info" target="_blank" rel="noreferrer">gmsh@onelab.info</a><br>
> > <a href="http://onelab.info/mailman/listinfo/gmsh" rel="noreferrer noreferrer" target="_blank">http://onelab.info/mailman/listinfo/gmsh</a><br>
> _______________________________________________<br>
> gmsh mailing list<br>
> <a href="mailto:gmsh@onelab.info" target="_blank" rel="noreferrer">gmsh@onelab.info</a><br>
> <a href="http://onelab.info/mailman/listinfo/gmsh" rel="noreferrer noreferrer" target="_blank">http://onelab.info/mailman/listinfo/gmsh</a><br>
<br>
— <br>
Prof. Christophe Geuzaine<br>
University of Liege, Electrical Engineering and Computer Science <br>
<a href="http://people.montefiore.ulg.ac.be/geuzaine" rel="noreferrer noreferrer" target="_blank">http://people.montefiore.ulg.ac.be/geuzaine</a><br>
<br>
<br>
<br>
<br>
</blockquote></div>