On 26/12/09 20:58, Durufle marc wrote:
Hello,
your help has been very useful for the problem of the cavity, thanks
very much. I have another problem with
the geo file attached. I want that "ruled surfaces" 36, 38, 40, 46, 48
and 50 are part of a cylinder, so I tried to
construct nurbs which are belonging the cylinder, but the generated
ruled surfaces are not part of the cylinder :(
Hi Marc,
the mesh seems fine here. How do you have verified that these ruled surfaces
are not part of the cylinder ?
Do you know a way to generate those surfaces correctly ?
We have an option to force the mesh on the surface of a sphere, but not on a
cylinder...
http://geuz.org/gmsh/doc/texinfo/gmsh.html#Surfaces
Ruled Surface ( expression ) = { expression-list } < In Sphere { expression } >;
Creates a ruled surface, i.e., a surface that can be interpolated using transfinite interpolation. The expression
inside the parentheses is the ruled surface's identification number; the first expression-list on the right hand side
should the identification number of a line loop composed of either three or four elementary lines. The optional In
Sphere argument forces the surface to be a spherical patch (the extra parameter gives the identification number of the
center of the sphere).
Is it possible
(or soon possible) to specify directly
a nurb surface in gmsh (not only a nurb curve), so that I could
approximate the cylinder with nurb patches ?
I don't think we will add nurbs surfaces support natively in Gmsh ( Christophe,
Jean-François, a comment ? )
You could/should generate these critical nurbs surfaces in a real CAD
software/Solid Modeler
( Salome http://www.salome-platform.org/ is free and based on the same CAD
engine as Gmsh, OpenCascade),
export it in the STEP format, import in Gmsh, finalize the geometry and mesh
...
Regards,
Dave
--
David Colignon, Ph.D.
Collaborateur Logistique du F.R.S.-FNRS
CÉCI - Consortium des Équipements de Calcul Intensif
ACE - Applied & Computational Electromagnetics
Institut Montefiore B28
Université de Liège
4000 Liège - BELGIQUE
Tél: +32 (0)4 366 37 32
Fax: +32 (0)4 366 29 10
WWW: http://hpc.montefiore.ulg.ac.be/
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