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renumberMesh while solving

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Old   March 16, 2022, 13:55
Default renumberMesh while solving
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qutadah
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Hello everyone,


I have used renumberMesh on a case that was already being solved, and I am not sure if it has messed up anything, since whenever I open my solution in paraview, the field looks weird and somehow wrong.



Attached are photos of same fields of the renumberMesh case and the normal case.


Thanks!
Attached Images
File Type: jpg renumberMesh.jpg (50.6 KB, 16 views)
File Type: jpg normal.jpg (44.9 KB, 15 views)
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Old   March 17, 2022, 02:43
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Gerhard Holzinger
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Depending on what actually happened, you might have seriously messed up your case.

When you start your solver, the solver reads the mesh from the polyMesh directory, and then holds this information in memory. This information is then used when writing the fields.

If you execute renumberMesh while the solve is running, you are changing the information in the polyMesh directory. The solver, most probably will not be aware of the changes.

Hence, the solver writes its fields using the old mesh data, while all you post-processing operations use the new mesh data.


This is akin to remodelling the flat of a blind person, without telling him/her.
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Old   March 17, 2022, 13:18
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aha i understand, I do have some timestep solutions from before i executed the renumberMesh. I will try to replace the polyMesh data with the old one and open the old solutions.



Thanks!
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Old   March 18, 2022, 02:27
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Gerhard Holzinger
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If you have run renumberMesh with the -overwrite option, then the old mesh is lost.
Whether you can fix your case or not, depends on what exactly you did, and whether the necessary information exists somewhere else.

The best way forward, would be to clear the slate; renumber the mesh, and then afterwards run the simulation. If you are unlucky, the already computed time steps are junk.
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Old   March 18, 2022, 04:57
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I have the old polyMesh data and already computed some timesteps before running the renumberMesh. I tried however copying the old mesh data into the case and viewing it with the old timesteps in paraview, this has not fixed anything.



What might be the problem?


Thanks!
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