[mesh manipulation] How to export an OpenFoam mesh

Alczem · October 3, 2022, 12:35

Hey everyone!

I am looking for a way to export a mesh written in the polymesh folder of an OpenFoam case, so that I can save it to a .cgns, .unv or .med file, and eventually use it in code_saturne.

I tried several things:

read the mesh in Paraview and save it as a CGNS file, but I cannot use it after the conversion

import the Paraview-generated CGNS in Salome Mesh. It creates two bodies (one for the surfaces, one for the volumes). I create a compound but somehow it distorts the elements and the mesh is useless.

foamToEnsight with several options, but the file misses the index of the vertices according to code_saturne

From Paraview, save the different boundary patches to stl files, import them in Salome then use them to create a 3D mesh, but I cannot figure out that last step.

I also looked into softwares that would allow the user to read an openfoam case and then save the mesh separately (I know cfMesh+ can do that, I also tried with Helyx OS and simflow without any success).

There is also a community utility foamToMed written for OF2.0 if I remember correctly, but I have to work with OFv2206...

And now I am running out of ideas

does anyone have any experience with this kind of issue? Thanks for the help!

Alczem · October 4, 2022, 10:48

Hey!

I eventually found a workaround which does not need to use OF meshers: I used the Reverse Engineering module of FreeCad to map a bspline surface to my elevation map. Then I could use all the boolean operations needed in Salome.

If anyone does have an actual solution for the original question, feel free to post it

October 3, 2022, 12:35	How to export an OpenFoam mesh	#1
Alczem Senior Member Join Date: Dec 2021 Posts: 241 Rep Power: 5	Hey everyone! I am looking for a way to export a mesh written in the polymesh folder of an OpenFoam case, so that I can save it to a .cgns, .unv or .med file, and eventually use it in code_saturne. I tried several things: read the mesh in Paraview and save it as a CGNS file, but I cannot use it after the conversion import the Paraview-generated CGNS in Salome Mesh. It creates two bodies (one for the surfaces, one for the volumes). I create a compound but somehow it distorts the elements and the mesh is useless. foamToEnsight with several options, but the file misses the index of the vertices according to code_saturne From Paraview, save the different boundary patches to stl files, import them in Salome then use them to create a 3D mesh, but I cannot figure out that last step. I also looked into softwares that would allow the user to read an openfoam case and then save the mesh separately (I know cfMesh+ can do that, I also tried with Helyx OS and simflow without any success). There is also a community utility foamToMed written for OF2.0 if I remember correctly, but I have to work with OFv2206... And now I am running out of ideas does anyone have any experience with this kind of issue? Thanks for the help!

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October 4, 2022, 10:48		#2
Alczem Senior Member Join Date: Dec 2021 Posts: 241 Rep Power: 5	Hey! I eventually found a workaround which does not need to use OF meshers: I used the Reverse Engineering module of FreeCad to map a bspline surface to my elevation map. Then I could use all the boolean operations needed in Salome. If anyone does have an actual solution for the original question, feel free to post it