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-   -   Plotting residual in OpenFoam (https://www.cfd-online.com/Forums/openfoam-post-processing/113841-plotting-residual-openfoam.html)

andrei.cimpoeru February 27, 2013 14:20
Plotting residual in OpenFoam
 
Has anyone any idea how to plot the residuals in OpenFoam from a >.log file ?

Many thanks

Andrei

cutter February 27, 2013 15:58
Hi,

you could try pyFoamPlotWatcher.py from the PyFoam utilities.

cutter

sasanghomi February 27, 2013 16:18
Hi ,

Copy the code in a txt file and set it in the case directory,
Code:
set logscale y
set title "Residuals"
set ylabel 'Residual'
set xlabel 'Iteration'
plot "< cat log | grep 'Solving for Ux' | cut -d' ' -f9 | tr -d ','" title 'Ux' with lines,\
"< cat log | grep 'Solving for Uy' | cut -d' ' -f9 | tr -d ','" title 'Uy' with lines,\
"< cat log | grep 'Solving for Uz' | cut -d' ' -f9 | tr -d ','" title 'Uz' with lines,\
"< cat log | grep 'Solving for omega' | cut -d' ' -f9 | tr -d ','" title 'omega' with lines,\
"< cat log | grep 'Solving for k' | cut -d' ' -f9 | tr -d ','" title 'k' with lines,\
"< cat log | grep 'Solving for p' | cut -d' ' -f9 | tr -d ','" title 'p' with lines
pause 1
reread

gnuplot Residuals -
Now type (in the terminal):
Code:
gnuplot residual
It needs gnuplot ...

Sasan.

Bernhard February 28, 2013 07:08
Quote:
Originally Posted by andrei.cimpoeru (Post 410519)
Has anyone any idea how to plot the residuals in OpenFoam from a >.log file ?
The foamLog utility is designed for it. It will extract the residuals and put them in different files.

andrei.cimpoeru February 28, 2013 07:13
I used the foamLog and I have the files I used excel package which comes with ubuntu 11.10 but i want to something which is automatically ........

Bernhard February 28, 2013 07:15
Then you should dig into the first answer you got.

wyldckat February 28, 2013 08:24
Quick answer: http://www.cfd-online.com/Forums/ope...residuals.html

wernsen March 1, 2013 08:00
pyFoamPlot... is the best to do this job ad its simple too!

Jackie Chen October 24, 2013 06:31
Quote:
Originally Posted by wernsen (Post 410874)
pyFoamPlot... is the best to do this job ad its simple too!
no command found. is this a valid command?thanks

eysteinn October 24, 2013 06:45
Quote:
Originally Posted by Jackie Chen (Post 458743)
no command found. is this a valid command?thanks
You need to install pyFoam:
http://openfoamwiki.net/index.php/Contrib_PyFoam


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