Dear all,
I am need to solve a PDE in which different kinds of boundry
conditions are applied in different portions of the boundary. I can do
that if I generate the mesh with libmesh and using
MeshTools::Modification::change_boundary_id. However I will need to deal
with complicated geometries and thus would like to use an external
program to generate the mesh, but I am getting lost in the docs and
examples.
Can anyone suggest a combination of a program (free and running under
Linux) that can generate a mesh and save it into a file format, so that
I can later load it in libmesh together with tags for boundary
conditions? I have been playing around with triangle and gmsh and
various file formats, but without much luck. I cannot find a format for
the mesh file that is both supported by the meshing program and loads
the correct boundary tags in libmesh. As the possibile combination of
programs/formats are quite a lot, I thought that someone out there might
have already gone through this...
In order to be concrete, say that I want a square domain with a hole and
that, once loaded by libmesh, the outer boundary of the square must have
boundaryID=0 and the boundary of the hole must have boundaryID=1.
Another (related) question is wether ex29.C can be modified to tag the
boundaries of the generated mesh. The last time I looked at this it
seemed that the libmesh triangle interface does not support tagging of
boundaries (line 257 of mesh_triangle_interface.C in svn 4823 sets the
"B" option). Am I right?
Matteo
--
Matteo Semplice Dip. di Fisica e Matematica
Phone: 031-2386132 Università dell'Insubria
Fax: 031-2386209 Via Valleggio, 11
22100 Como
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