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How to quickly extract a huge number of field files in parallel |
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January 25, 2021, 04:54 |
How to quickly extract a huge number of field files in parallel
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#1 |
New Member
Join Date: Apr 2018
Posts: 14
Rep Power: 8 |
Hi openfoam experts here,
I recently encountered a weird problem to me, where I found the postprocess utility could not perform consistently when using it to extract data from field files onto a surface. I want to obtain a time history of enstrophy on a surface in the 3D domain, so I firstly ran simulations in parallel using 200 cores to calculate the enstrophy fields. Those fields were output at every 0.01, so that about 10000 fields were generated. Then I ran postprocess also in parallel to extract the info through the -func surfaces objective. However, the performance for different runnings is pretty diversified. Sometimes it can give out 4000 output per run, but sometimes only just a few hundreds. This is much despairing, because I have a lot of cases to deal with. I didn't dig too much into this at first and didn't realise as well if there might be a convenient way to extract surfaces info in runtime?? Can anyone give me any idea to save this? The environment is OpenFOAM+ v1712 and processors stored in collocated filehandler. |
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January 28, 2021, 03:17 |
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#2 |
Senior Member
Join Date: Dec 2019
Location: Cologne, Germany
Posts: 365
Rep Power: 8 |
if i understand you correctly, you want to output a certain quantity just for a surface at runtime.
you can do that with a little bit of coding. you can write a code within controlDict -> functions that writes out that quantity of interest whenever you want. https://www.openfoam.com/documentati...hp#x7-390002.2 here is an example. |
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January 29, 2021, 17:01 |
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#3 |
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Ran
Join Date: Aug 2016
Posts: 69
Rep Power: 10 |
What postprocess utility do you use to extract Enstrophy?
__________________
Yours in CFD, Ran |
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Tags |
extract surfaces, large data, postprocessing, runtime postprocessing |
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