2012/2/14 Steve Daley <[email protected]>: > I am very interested in using gmsh to generate tet meshes for my own CFD > code development. I can see that gmsh will potentially be very useful to me > to genertae my tet meshes but is it possible for gmsh to output whether a > triangle element in a tet mesh is a surface triangle ?
Normally Gmsh only outputs triangular elements in three-dimensional meshes if they belong to a defined surface, typically used for boundaries and interfaces; that is, the faces of tetrahedra are not generated or output. In the finite element method, the domain elements are defined in terms of nodes and faces don't really enter; if you do need the faces, e.g. for a finite volume method, you'll need to do further postprocessing. > Also can you explain what "physical 99" and "elementary 2" means in the > example on Page 85. I'm not sure what document you're referring to, but I'm guessing Page 85 is the same as Section 9.1 `MSH ASCII file format' of the on-line manual <http://geuz.org/gmsh/doc/texinfo/gmsh.html#MSH-ASCII-file-format>. If so, see Section `6.2 Elementary vs. physical entities' <http://geuz.org/gmsh/doc/texinfo/gmsh.html#Elementary-vs-physical-entities>. In brief: an element's elementary entity merely refers to the geometry it meshes; its physical entity is like a subdomain or patch that the user has deliberately tagged, e.g. in order to impose different values of coefficients or boundary conditions. _______________________________________________ gmsh mailing list [email protected] http://www.geuz.org/mailman/listinfo/gmsh
