pyfoamPlotRunner and Watcher do not show any plots, only terminal outputs

manle0312 · August 15, 2022, 04:21

I am running the Vortex Shedding c2 case. I run my case using the following commands:

Code:

foamCleanTutorials

Code:

fluent3DMeshesToFoam ../../../meshes_geometries/vortex_shedding/ascii.msh

Code:

checkMesh

Code:

renumberMesh -overwrite

Code:

icoFoam | tee log.icofoam

Code:

pyFoamPlotWatcher.py log.icofoam

Code:

gnuplot scripts0/plot_coeffs

Code:

paraFoam

I managed to run the case using icoFoam, plot the coefficients and visualize it using openFoam. However, I am unable to get

Code:

pyFoamPlotWatcher.py log.icofoam

to show any plots.
I made sure that my simulation does have a lot of time step data (350 seconds in total, and plot_coeffs do have a lot of time data). I also tried to use

Code:

pyFoamPlotRunner.py icoFoam

. But, both of these only give terminal outputs and no plots.

So, to sum up:

Code:

pyFoamPlotWatcher.py log.icofoam

gives these output:
https://pastebin.com/iKqkDD07

Code:

pyFoamPlotRunner.py icoFoam

gives these output:
https://pastebin.com/nzJPPzCr

I see no plot outputs popping up. I am on Arch Linux and also tried to switch Desktop Environment to see if it helps, still didnt get any plots.

Also, i made sure that my

Code:

gnuplot

command works.

Any help is appreciated.

hyunko · August 26, 2022, 09:43

Do you use openfoam10?
In OF10, I have a same issue for PyFoam.

gschaider · August 29, 2022, 04:19

Trigger warning: this posting may contain sarcasm. Don't read if you find that disturbing

Quote:

Originally Posted by hyunko

Do you use openfoam10?
In OF10, I have a same issue for PyFoam.

Yeah. It is OF10

PyFoam needs to the detect the current time to do the plotting. For the last 20 years OF printed out the time in this format

Code:

Time = 42

Now it seems that the Foundation found out that one of the major problems that made using OpenFOAM hard was that people thought this might 42 years. So it seems that they changed it to

Code:

Time = 42s

to make things easier for the user. Unfortunately the extra "s" means that PyFoam doesn't recognize it as Time and therefore doesn't plot anything

As a temporary fix you can create a file ~/.pyFoam/pyfoamrc.d/of10.cfg with the content

Code:

[SolverOutput]
timeregexp: ^(Time =|Iteration:) (.+)s$

This makes PyFoam recognize the time format of OF10 but breaks it for all distros that value backwards-compatibility (and also OF9 and earlier)

For the next PyFoam-version I'll hardcode a time-expression that
- works for older versions (because I think that backwards-compatibility is courtesy towards the user)
- recognizes the alternate format
- does not accept everything that has "Time =" in it as a valid time (this is the hard part because there are outputs like "ExecutionTime =" that should not fit)

hyunko · August 29, 2022, 07:52

Thanks for your kind explanation.

August 15, 2022, 04:21	pyfoamPlotRunner and Watcher do not show any plots, only terminal outputs	#1
manle0312 New Member Marrie Join Date: Dec 2014 Posts: 13 Rep Power: 0	I am running the Vortex Shedding c2 case. I run my case using the following commands: Code: foamCleanTutorials Code: fluent3DMeshesToFoam ../../../meshes_geometries/vortex_shedding/ascii.msh Code: checkMesh Code: renumberMesh -overwrite Code: icoFoam \| tee log.icofoam Code: pyFoamPlotWatcher.py log.icofoam Code: gnuplot scripts0/plot_coeffs Code: paraFoam I managed to run the case using icoFoam, plot the coefficients and visualize it using openFoam. However, I am unable to get Code: pyFoamPlotWatcher.py log.icofoam to show any plots. I made sure that my simulation does have a lot of time step data (350 seconds in total, and plot_coeffs do have a lot of time data). I also tried to use Code: pyFoamPlotRunner.py icoFoam . But, both of these only give terminal outputs and no plots. So, to sum up: Code: pyFoamPlotWatcher.py log.icofoam gives these output: https://pastebin.com/iKqkDD07 Code: pyFoamPlotRunner.py icoFoam gives these output: https://pastebin.com/nzJPPzCr I see no plot outputs popping up. I am on Arch Linux and also tried to switch Desktop Environment to see if it helps, still didnt get any plots. Also, i made sure that my Code: gnuplot command works. Any help is appreciated.

August 26, 2022, 09:43		#2
hyunko Member Hyun Ko Join Date: Jun 2009 Posts: 35 Rep Power: 17	Do you use openfoam10? In OF10, I have a same issue for PyFoam.

August 29, 2022, 07:52		#4
hyunko Member Hyun Ko Join Date: Jun 2009 Posts: 35 Rep Power: 17	Thanks for your kind explanation.