> On 4 Nov 2020, at 09:31, françois fraysse <[email protected]> wrote: > > Many thanks for your answer, > > In the meanwhile I found one of your articles which explains bounds for > triangles: > > https://gmsh.info/doc/preprints/gmsh_curved2_preprint.pdf > > Then, after digging more in my own code I found a mistake related with node > numbering, I was using vtk ordering for 10 node tets which is slighty > different (2 last mid-edges nodes are swapped). That did it. >
Ok, great! Christophe > My apologies... > > btw AnalyseMeshQuality returns minJ inside or very close to target > > Best regards > De : Christophe Geuzaine <[email protected]> > Envoyé : mercredi 4 novembre 2020 08:10 > À : françois fraysse <[email protected]> > Cc : [email protected] <[email protected]> > Objet : Re: [Gmsh] curved mesh and jacobian > > > > > On 29 Oct 2020, at 17:49, françois fraysse <[email protected]> > > wrote: > > > > Hello GMSH users and developers, > > > > I generated a simple quadratic tetrahedra based mesh using default settings > > with gmsh v4.6.0. After regularizing, minimum jacobian lies between default > > target, ScaledMinjac=0.102 so mesh seems valid, no warning or errors. > > > > Then in a separate code I post-process the mesh and build quadratic shape > > functions. I evaluate the determinant of the Jacobian at the 10 nodes of > > each tetra and it turns out that I get some small values below zero for > > some tetras : ~1e-2/1e-3. > > > > I do not exclude a mistake in the verification procedure, but I didn't find > > it so far. > > > > My question is : is ScaledMinJac an exact value or an approximation ? > > > > The value is not exact, but the validity check is a provable bound, i.e. we > we report that the element is correct it should be. Can you run the > AnalyseMeshQuality plugin and check the results? > > Christophe > > > > Thank you for developing such a great software :) > > _______________________________________________ > > gmsh mailing list > > [email protected] > > http://onelab.info/mailman/listinfo/gmsh > > — > Prof. Christophe Geuzaine > University of Liege, Electrical Engineering and Computer Science > http://people.montefiore.ulg.ac.be/geuzaine — Prof. Christophe Geuzaine University of Liege, Electrical Engineering and Computer Science http://people.montefiore.ulg.ac.be/geuzaine _______________________________________________ gmsh mailing list [email protected] http://onelab.info/mailman/listinfo/gmsh
