[Gmsh] nodes don't align with geometry for simple rectangle

CHAMPANEY Laurent laurent.champaney at meca.uvsq.fr
Thu Aug 25 09:54:01 CEST 2005


Hi,
on my version (the same one : gmsh 1.60.1 via apt-get on debian),
the mesh (.msh) is correct : see attached file.
Laurent


Al Danial a écrit :

>Here's something curious:  I create a rectangle having dimensions
>of 6 x 2 units with
>
>Point(1) = {0, 0, 0, 0.5};
>Point(2) = {6, 0, 0, 0.5};
>Point(3) = {6, 2, 0, 0.5};
>Point(4) = {0, 2, 0, 0.5};
>Line (1) = {1, 4};
>Line (2) = {2, 3};
>Line (3) = {4, 3};
>Line (4) = {1, 2};
>Line Loop (1000006) = {1, 3, -2, -4};
>Ruled Surface (6) = {1000006};
>
>then mesh it with triangular elements.  It gives 66 nodes and
>130 elements and visually the nodes along the boundary line 
>up perfectly with the geometric Line entities.  So far, so good.
>
>However when I save the mesh, the nodal coordinates on the 
>right edge don't match the geometry.  Node 3, which is located
>where Point 3 is, has coordinates of 5.7, 1.9 instead of
>6.0, 2.0.  In fact all nodes on the right edge of the rectangle
>have an X value of 5.7 instead of 6.0, and all nodes on the top 
>edge have a Y value of 1.9 instead of 2.0.
>
>I'm using version 1.60-1 (via Debian apt-get).
>
>Any hints as to why my boundary nodes don't match the
>geometric boundary?            -- Al
>
>_______________________________________________
>gmsh mailing list
>gmsh at geuz.org
>http://www.geuz.org/mailman/listinfo/gmsh
>
>  
>

-- 
Laurent CHAMPANEY - UVSQ Dept de Mecanique
Laboratoire d'Etudes Mécaniques des Assemblages (CNRS-FRE2481)
RC 28 - Bat Descartes 
45, av des Etats Unis - 78035 VERSAILLES Cedex
Tel 01 39 25 30 26 - Fax 01 39 25 30 15
http://www.lema.uvsq.fr
http://www.ipsi.asso.fr (IPSI)
http://www.librecours.org (Cours en Ligne)



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