Hello, I had success using the exodusII file format, which I had generated with cubit[1]. In addition to generating the geometry and meshing it, you have to create "sidesets" containing the surfaces on which you want to apply your BC.
Robert [1] http://cubit.sandia.gov/ On Wed, Oct 19, 2011 at 11:33:48AM +0200, Matteo Semplice wrote: > 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 > > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure contains a > definitive record of customers, application performance, security > threats, fraudulent activity and more. Splunk takes this data and makes > sense of it. Business sense. IT sense. Common sense. > http://p.sf.net/sfu/splunk-d2d-oct > _______________________________________________ > Libmesh-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/libmesh-users ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2d-oct _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
