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CFD-Post run session on hpc

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Old   September 19, 2019, 09:23
Default CFD-Post run session on hpc
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Dear all

Currently I have a large transient simulation which I try to post process in CFD-post. However as this can be tedious I am exporting data from multiple planes in the domain through a session file (perl script). This works fine if I have only a few planes. However I need to do the same for a large amount of planes (>100). This takes time and the workstation is hammering my harddrives as it accesses every time step individual.

So my question is how can I do exactly this but on an hpc. This may not go quicker but it is of my computer. Does anyone know how I can run CFD-post on the hpc, load a results file and play a session file?

Thank you for your suggestions.
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Old   September 22, 2019, 19:19
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You might also consider a high-end post processing package like Ensight, Fieldview or Tecplot. They have are designed to handle massive data sets.
Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.
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Old   September 23, 2019, 13:20
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Working off a SSD or RAID SSD will also speed this up compared to using hard drives. What type of drive is the .res file and transient files saved to?
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Old   October 3, 2019, 10:02
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Thank you very much for your replies. I agree with all suggestions. Working of an SSD definitely helps and a different post-processing package as well. The reason for moving the post-processing onto the HPC is not necessarily to speed it up, but to free local resources.

I did see that cfd-post can be run through the command window and I tried the following:


#SBATCH -p hipri #select partition (hipri, medpri, lowpri)
#SBATCH -J Post #Job name
#SBATCH -o slurm-%j.out #Output
#SBATCH --nodes=1 #number of nodes
#SBATCH -n 1 #number of cores
#SBATCH -t 0-00:10 #time (D-HH-MM)

module load ansys/182
#SBATCH -cwd

cfx5post -batch HPC.cse

where HPC.cse is the session file I want to run. However I get the following errors:
viewer_ogl.exe: cannot connect to X server localhost:13.0
Socket::waitForConnection - Connection timeout after 120s

I assume that this has something to do with the interface. I am using PuTTY and have enabled X11 forwarding. Technically I don't need an interface but I assume that CFD-Post only runs with and interface? How do I set it up correctly so I can run it on the HPC?

This afternoon I was able to run exactly what I want to do on the cluster on my local machine through the command line window. I did notice that I had to adjust a few commands. But with the fillowing command line it did work on the local computer:
cfx5post -line -batch HPC.cse Test.res
However when running on the HPC I still have the same issue described above. Does anyone have an advice?

Last edited by hand90; October 3, 2019 at 12:16.
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cfd-post, hpc

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