Thank you for your prompt assistance, Christophe. That was exactly my issue.
Best regards, Robert Jaeger On Thu, Dec 27, 2018 at 11:42 AM Christophe Geuzaine <[email protected]> wrote: > > My guess is that you have selected "Save all elements" (or have > "Mesh.SaveAll = 1" in your option file). In the MSH2 format, this option > discards the physical group definitions. (The MSH4 format's behaviour is > more intuitive - it keeps the physical groups.) > > Christophe > > > On 27 Dec 2018, at 20:21, Robbie Jaeger <[email protected]> wrote: > > > > Hi, > > > > I'm having difficulty exporting a .msh ASCII file (format version 2) > that includes the physical entity tags for elements. I've created a box > volume and have assigned the 6 surfaces and volume to separate physical > groups. I'd like to export the mesh as a .msh ASCII file (format version 2) > as an input for a finite element program. As such, I am using the physical > groups to identify regions where boundary conditions apply and where > material types are assigned. I'm using gmsh version 4.0.7 Win64 on Windows > 10. > > > > The .geo commands for the box are as follows: > > > > SetFactory("OpenCASCADE"); > > Box(1) = {0, 0, 0, 10, 10, 5}; > > Physical Surface("DS") = {2}; > > Physical Surface("US") = {1}; > > Physical Volume("Solid") = {1}; > > Physical Surface("Other Surface") = {3, 5, 6, 4}; > > > > I created 1d, 2d, and 3d meshes using the GUI. When I export this to a > .msh file (format version 2), the elements are exported with their > elementary tags rather than their physical tags. For example, here is the > line from the .msh file for element 500 which falls on elementary surface 6 > and physical surface 4: > > 500 2 2 0 6 15 247 237 > > > > Three-dimensional elements are similarly exported using their elementary > surface tags. Here is a 4-node tetrahedron within elementary volume 1 and > physical volume 5: > > 924 4 2 0 1 169 306 196 293 > > > > Based on the documentation, I expected the first tag after the number of > tags to be the physical entity tag: > > > > number-of-tags > > gives the number of integer tags that follow for the n-th element. By > default, the first tag is the tag of the physical entity to which the > element belongs; the second is the tag of the elementary geometrical entity > to which the element belongs;... > > > > However, I'm receiving a zero tag for all elements. Am I > misunderstanding the documentation or is this the intended behavior? Is > there a way to export a .msh with the physical entity tags or do I need to > go about this in a different way? > > > > Best regards, > > Robert Jaeger > > _______________________________________________ > > gmsh mailing list > > [email protected] > > http://onelab.info/mailman/listinfo/gmsh > > — > Prof. Christophe Geuzaine > University of Liege, Electrical Engineering and Computer Science > http://www.montefiore.ulg.ac.be/~geuzaine > > Free software: http://gmsh.info | http://getdp.info | http://onelab.info > >
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