2011/2/21 Paavo Mäkelä <[email protected]>: > Hi, > > I have had a working workflow for making 2D meshes from trimmed NURBS > geometry made in Aliasstudio. I use the Elmer solver to perform flow > simulations. > > I recently continued my work on my personal design project and noticed that > GMSH will produce meshes that contain 3 dimensional elements (as per Elmer > software's log) and sometimes Elmer software detects 3 dimensional mesh, > even though the original geometry is/was a 2D plane! What am I doing wrong > here? Loading the original IGES file straight into Elmer software results in > 2D mesh with 2D elements which implies the exported cad file is Ok (but > because elmer can't handle trimmed 2d NURBS planes, I must always go through > Gmsh). I think only 2D elements should be generated if you only use the 2D > meshing functionality in Gmsh? I can post my IGES file if there is need for > that.
Hello, I haven't tried Elmer (yet), but I believe Gmsh only outputs three-dimensional meshes, even if your geometry is two-dimensional or even one-dimensional; i.e. the nodes always have three coordinates. Which output format do you use? For FreeFem++, for two-dimensional problems, I output in MEDIT .mesh from Gmsh, but then modify it in AWK to cull the z-coordinates. Perhaps a workaround like that would be reasonable? _______________________________________________ gmsh mailing list [email protected] http://www.geuz.org/mailman/listinfo/gmsh
