On 12/12/09 14:18, Hoessler, Julien wrote:
Hi David,
Thanks for the quick answer. The stl importation crashes with the stl file or a
msh file obtained from the stl,
Hi Julien,
does it print an error message before crashing ?
but I guess that's because my stl is too fine (214K elements), I'll try again
with a coarser mesh.
As far as the prism extrusion is concerned,it works well and after recombining,
the prism look perfectly fine on a curved surface, except that I get errors
telling me that the prisms are degenerated. Is it an unnecessary warning or
should I be worried?
Can you send a copy of these warnings ?
I also have a bonus question if you don't mind.
You're welcome
When I generate the extrusion of the surfaces and put them on a list surf[], is
it possible to access the edges and vertices of the top surfaces to define the
volume above?
No. But the Tools -> Visibility -> Tree browser can help tou to quickly
retrieve it.
I could extrude the edges and vertices too but it would mean that some entities
would be duplicated.
Not necessarily, after each extrusion operation, Gmsh issues the "Coherence;" command which should eliminate duplicated
entities.
Regard,
Dave
Best regards
Julien
________________________________________
De : David Colignon [[email protected]]
Date d'envoi : vendredi 11 décembre 2009 14:40
À : Hoessler, Julien
Cc : [email protected]
Objet : Re: [Gmsh] stl and prism extrusion
On 11/12/09 15:00, Hoessler, Julien wrote:
Good afternoon all,
First of all, thanks for writing this code, I'm using it a lot to generate
2D/3D meshes for DNS and stability analysis. I was wondering if it is possible
to extrude a layer of prisms using the surface normals instead of a specific
direction. I need to generate a layer of prisms out of a wall which is curved
and there is more than 80 degrees of angular difference between the two extreme
locations of the surface (it is smooth, but twists a bit like a sinh).
Hi Julien,
it is still experimental and quite hidden in the documentation
( http://www.geuz.org/gmsh/doc/texinfo/gmsh.html#Structured-grids ),
but you can try:
Extrude { Surface { expression-list }; layers }
which extrudes a boundary layer along the normals of the specified surfaces (if
they are smooth and do not form acute
angles).
My second question is about the stl importation. I have a stl file which is a
3D box that I can read and visualise without problems, but I'd like to remesh it
The undocumented "Compound Surface" command is also very experimental, but you
can try the attached file (reparam.geo)
which here use a .msh file but should also work with a .stl file.
, mesh the volume inside and split the box surface to assign different
physical groups for boundary conditions (and add
a layer of prisms on one of the surfaces). Is it possible with Gmsh? I've
searched through the questions in this mailing
list, do I need the opencascade support for this?
Regards,
Dave
--
David Colignon, Ph.D.
Collaborateur Logistique du F.R.S.-FNRS
CÉCI - Consortium des Équipements de Calcul Intensif
ACE - Applied& Computational Electromagnetics
Sart-Tilman 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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