This should be fixed in the highly build JFR Le 31 janv. 2013 à 18:39, Christophe Geuzaine <[email protected]> a écrit :
> > Hi Paul, > > Apparently we broke this (again) in 2.6. (It works fine in 2.5.) > > We will investigate. > > Thanks for the report, > > Christophe > > > On 25 Oct 2012, at 17:44, Paul Cristini <[email protected]> wrote: > >> Hello all, >> >> I am just trying to do the extrusion of a spline and depending on the >> position of a point of the spline I got 2 elements with a negative jacobian. >> >> Here is the .geo file. If Point(3) = { -L/2, l+dl/2, 0, lc}; is changed to >> Point(3) = { -L/2, l+dl/3, 0, lc}; ,which means that one point is lowered, >> then no problem. >> >> I am generating all quads meshes and I am also using second order elements. >> I noticed that if I use first order or incomplete second order element there >> is no element with a negative jacobian. >> >> Any idea of what's going on ? >> >> Thanks >> >> Paul >> >> // Gmsh project created on Sat Apr 10 19:26:34 2010 >> lambda = 30; >> lc=lambda/4; >> // >> L = 10 * lambda; // Width >> l = 8 * lambda; // Height >> dl = 2 * lambda; // Decalage >> >> Point(1) = { L, l+dl, 0, lc}; >> Point(2) = {-L, l, 0, lc}; >> // >> Point(3) = { -L/2, l+dl/2, 0, lc}; >> Point(4) = { 0, l+dl/3, 0, lc}; >> Point(5) = { L-L/4, l+dl/2, 0, lc}; >> >> //lx1 = newl; Line(lx1) = {cx2, cx1}; >> lx1 = newl; Spline(lx1) = {2, 3, 4, 5, 1}; >> Extrude {0,1.5*lambda,0} {Line{lx1}; Layers{3};Recombine; }; >> >> -- >> *--------------------------------------------------------------------------* >> Paul CRISTINI Charge de Recherche CNRS / CNRS Research Scientist >> -------- >> CNRS - Laboratoire de Mecanique et d'Acoustique (UPR 7051) >> >> 31 chemin Joseph Aiguier, F-13402 Marseille Cedex 20 - France >> mailto: [email protected] >> phone number: +33 (0)4 91 16 42 89 >> fax number: +33 (0)4 91 16 44 81 >> http://www.lma.cnrs-mrs.fr/ >> *--------------------------------------------------------------------------* >> >> >> _______________________________________________ >> gmsh mailing list >> [email protected] >> http://www.geuz.org/mailman/listinfo/gmsh > > -- > Prof. Christophe Geuzaine > University of Liege, Electrical Engineering and Computer Science > http://www.montefiore.ulg.ac.be/~geuzaine > > > ------------------------------------------------------------------ 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) Center for Systems Engineering and Applied Mechanics (CESAME) Tel : +32-10-472352 -- Mobile : +32-473-909930
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