Hi Eric,
there is the "Boundary{}" command :
http://www.geuz.org/gmsh/doc/texinfo/gmsh.html#Transformations
Boundary { transform-list }
(Not a transformation per-se.) Returns the boundary of the elementary
entities in transform-list.
with
transform-list:
Point | Line | Surface | Volume { expression-list };
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/
Agenda: http://www.google.com/calendar/embed?src=david.colignon%40gmail.com
On 26/02/10 08:39, Eric Nutsch wrote:
Christophe,
It appears that the surface loop method to the boundary layer will
work in most all cases, but I may have found a more efficient way.
The BL extrude command returns a volume number as well. If it were
possible to take the farfield and preform a boolean operation with the
BL volumes, it would make the process very simple even for complex
BLs.
I attempted this for in your sphere example:
Volume(1001) = {1002, 1,2,3,4,5,6,7,8};
,but gmsh replied with "Unknown surface loop 1"
Is there any way to convert a volume (created via extrude for example)
to be converted into a surface loop?
Perhaps I am missing an important leap in the coding structure, but if
it was possible it would be an extremely handy function.
What are your thoughts?
Thanks,
Eric Nutsch
On Wed, Feb 24, 2010 at 4:03 AM, Christophe Geuzaine
<[email protected]> wrote:
On 24/02/10 11:26, julien hoessler wrote:
Hi Eric,
If it is a flat surface or if you know where the interface would be
located you can just move your domain line/surface to the interface and
extrude it towards the outside, but otherwise I can't seem to find a way
to link the interface with the rest of the mesh
Hi Guys - boundary layers are still a bit experimental, but the basics are
there to connect them with other geometrical entities. Attached are two
examples:
* sphere_boundary_layer.geo shows how to connect volumes to boundary layer
faces ;
* t1_boundary_layer_connection.geo shows how you can also connect things to
the lines or vertices created during the boundary layer generation.
Retrieving the id numbers of the extruded entities can be done in a script
the usual way (list[] = Extrude...), but as usual this only gives access to
the ids of the "top" surface, the new volume and the "lateral" surfaces.
To retrieve the ids of the new lines and the new points, you have at the
moment to resort to the GUI (in "Tools->Options->General->General" select
"Enable mouse hover over meshes" to see the numbers displayed at the bottom
of the graphical window).
Hope this helps,
Christophe
regards
Julien
On 24 Feb 2010, at 02:03, Eric Nutsch wrote:
Hi,
Has anyone successfully gotten an extruded boundary layer to interface
with a mesh?
Thanks,
Eric Nutsch
_______________________________________________
gmsh mailing list
[email protected]
http://www.geuz.org/mailman/listinfo/gmsh
Julien Hoessler
PhD Student
Department of Aeronautics
Imperial College London
Phone: +44 (0) 20759 45042
Email: [email protected]
_______________________________________________
gmsh mailing list
[email protected]
http://www.geuz.org/mailman/listinfo/gmsh
--
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine
_______________________________________________
gmsh mailing list
[email protected]
http://www.geuz.org/mailman/listinfo/gmsh
_______________________________________________
gmsh mailing list
[email protected]
http://www.geuz.org/mailman/listinfo/gmsh
