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: crist...@lma.cnrs-mrs.fr
phone number: +33 (0)4 91 16 42 89
fax number: +33 (0)4 91 16 44 81
http://www.lma.cnrs-mrs.fr/
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