<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">This should be fixed in the highly build<br><div><div><br></div><div>JFR</div><div>Le 31 janv. 2013 à 18:39, Christophe Geuzaine <<a href="mailto:cgeuzaine@ulg.ac.be">cgeuzaine@ulg.ac.be</a>> a écrit :</div><br class="Apple-interchange-newline"><blockquote type="cite"><br>Hi Paul,<br><br>Apparently we broke this (again) in 2.6. (It works fine in 2.5.)<br><br>We will investigate.<br><br>Thanks for the report,<br><br>Christophe<br><br><br>On 25 Oct 2012, at 17:44, Paul Cristini <<a href="mailto:cristini@lma.cnrs-mrs.fr">cristini@lma.cnrs-mrs.fr</a>> wrote:<br><br><blockquote type="cite">Hello all,<br><br>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.<br><br>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.<br><br>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.<br><br>Any idea of what's going on ?<br><br>Thanks<br><br>Paul<br><br>// Gmsh project created on Sat Apr 10 19:26:34 2010<br>lambda = 30;<br>lc=lambda/4;<br>//<br>L = 10 * lambda; // Width<br>l = 8 * lambda; // Height<br>dl = 2 * lambda; // Decalage<br><br>Point(1) = { L, l+dl, 0, lc};<br>Point(2) = {-L, l, 0, lc};<br>//<br>Point(3) = { -L/2, l+dl/2, 0, lc};<br>Point(4) = { 0, l+dl/3, 0, lc};<br>Point(5) = { L-L/4, l+dl/2, 0, lc};<br><br>//lx1 = newl; Line(lx1) = {cx2, cx1};<br>lx1 = newl; Spline(lx1) = {2, 3, 4, 5, 1};<br>Extrude {0,1.5*lambda,0} {Line{lx1}; Layers{3};Recombine; };<br><br>-- <br>*--------------------------------------------------------------------------*<br>Paul CRISTINI Charge de Recherche CNRS / CNRS Research Scientist<br>--------<br>CNRS - Laboratoire de Mecanique et d'Acoustique (UPR 7051)<br><br>31 chemin Joseph Aiguier, F-13402 Marseille Cedex 20 - France<br>mailto: <a href="mailto:cristini@lma.cnrs-mrs.fr">cristini@lma.cnrs-mrs.fr</a><br>phone number: +33 (0)4 91 16 42 89<br>fax number: +33 (0)4 91 16 44 81<br><a href="http://www.lma.cnrs-mrs.fr/">http://www.lma.cnrs-mrs.fr/</a><br>*--------------------------------------------------------------------------*<br><br><br>_______________________________________________<br>gmsh mailing list<br>gmsh@geuz.org<br>http://www.geuz.org/mailman/listinfo/gmsh<br></blockquote><br>-- <br>Prof. Christophe Geuzaine<br>University of Liege, Electrical Engineering and Computer Science <br><a href="http://www.montefiore.ulg.ac.be/~geuzaine">http://www.montefiore.ulg.ac.be/~geuzaine</a><br><br><br><br></blockquote></div><br><div apple-content-edited="true">
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