2010/5/26 Philippe Miron <[email protected]>: > Hi everyone, > > I'm using the Medit .mesh file format to export my mesh generated with this > test model (see attachment and generate the default 3D mesh). Question: is > it normal that there are nodes numbers that doesn't appear anywhere in the > Tetrahedra list (for exemple node # 1) ? > > Maybe I'm doing something wrong, but your help would really be appreciated!
Hello. There's not really a problem here. You haven't defined any physical entities, so when Gmsh saves the mesh, it saves everything. This means a vertex is saved for each geometric point, edges along each geometric line, triangles over each surface, and tetrahedra through each volume. Vertex 1 corresponds to Point (1), which is just a construction point in your geometry, a centre of a circle. Actually the meshing step ended up in your case putting a node right there at the same coordinates (0, 0, 0), vertex 51, and that is mentioned in Tetrahedra list. Anyway, that's the long complicated answer. The short answer is that you probably want to define physical entities for the pieces relevant to your finite element problem. See http://geuz.org/gmsh/doc/texinfo/gmsh.html#Elementary-vs-physical-entities. Here you might want a Physical Volume for the cylinder and maybe two or three Physical Surfaces for its ends and cylindrical wall. If you do that, you probably also want to set Mesh.SaveElementTagType = 2, so the MEDIT tags correspond to the Physical entities. _______________________________________________ gmsh mailing list [email protected] http://www.geuz.org/mailman/listinfo/gmsh
