Hello,
I have a 3D volumetric mesh inside paraview, I would like to create the ‘physical groups’ of define the ‘boundaries groups’ to use it in a simulation. currently the mesh is only composed of hexahedrals. the physical groups are on the faces, so firts i tried:
extract surface
group data with the extract surface and the 3D mesh
this gave (at least in logic) what i was looking for, ie., a object that has quads and hexas, but now i can not export anymore in gmsh format. I can only use it on the fully hexa mesh, but if i do this i dont have any physical group.
I would like to be able to divide my exterior faces manually in paraview (creating physical groups), regroup each of this groups with the 3D mesh and export it to a gmsh file (or a openFoam compatible format). is there a correct way to do this?
one can began from waveleght + unstructured cell types filter as 3D mesh to simulate the original workflow without the data.
Your best bet might be to use pyNastran to output a BDF file for the nodes and elements and then import that into gmesh. You can group the elements by property IDs
Hello,
thanks for the answer but i was looking to export directly from paraview, the I/O would be a bottleneck, I know (I think) how to do this using salome, i just wanted to do directly mesh creation → OpenFOAM without more programs involved. for the moment, i will use some utilities of OpenFOAM to be able to create the patches (reason for me of asking for the physical groups).
@mwestphal I allow myself to tag you as you are a direct developer of the pluging. could you confirm me if it is possible to create 2D physical groups for a 3D mesh directly from paraview so one can export the mesh in gmsh format directly?.
I thought about extracting the surface with extract surface filter, divide this filter by different regions and then use group data with the original volumetric mesh?
I would love to be able to not require 2 steps export/import.