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[OpenFOAM] Can't change timestep on a decomposed case with python scripts

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Old   May 6, 2020, 09:11
Default Can't change timestep on a decomposed case with python scripts
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Edoardo Gamba
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Hi everyone, need to postprocess a 140GB transient LES OpenFOAM case.
Basically what i'm doing is a bunch of 'for' cycles in python that pick a timestep, pick a slice plane, pick a parameter between U/p/vorticity, print the screenshot, then move the plane and so on, what i get is a lot of images of U/p/vorticity sliced in different positions and trough time.
I've tried using the script on a decomposed case (i have included casefoam.CaseType = 'Decomposed Case' in the .py file, paraview opens it as a decomposed case) but it won't cycle timesteps.
On a reconstructed case everything works fine except that it runs on a single core (I have a Xeon E5 2620 v3 CPU)
I am on windows 10 with paraview 5.7.0

TL;DR I need to cycle timesteps on a decomposed transient case with a python script, the one i made only works with reconstructed and not decomposed cases.


Thanks in advance
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Old   May 11, 2020, 08:49
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Kasper
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I don't know if this solves your problem, but a suggestion would be to place .foam files in each processor directory and open them in your script. So instead of opening 1 .foam file for your entire case, you'd open x number of files and process them as reconstructed cases.
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Old   May 21, 2020, 09:16
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Rishikesh
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I am facing the exact problem as yours. It seems that for a decomposed case, the variable casefoam.TimestepValues only lists [0.0]. It outputs the correct list for a reconstructed case allowing for selection.



Insterestingly, even with TimestepValues information missing in our reader, if I use the TemporalStatistics filter, it successfully traverses all timesteps (evident from some warnings that pop up in the process).
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