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Plot residuals over Iterations instead of time steps

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Old   July 29, 2016, 02:56
Default Plot residuals over Iterations instead of time steps
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Charles K.
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Hello everyone,

I would like to plot the residuals over the Pimple Iterations instead of every completed time step in order to see the PIMPLE-Loops. Usually i use pyFoamPlotWatcher.py to plot the residuals.

Is there a special extension to use with pyFoamPlotWatcher or do i have to change any setting?

Cheers,

Charles
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Old   July 29, 2016, 03:46
Default Have you gone through this
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Hey McCharles, I am not sure if pyFoamPlots have that option while running a transient case.

http://www.cfd-online.com/Forums/ope...residuals.html

But if you haven't gone through the above link I suggest going through it thougroughly. Of course it isnt as straight forward as the pyFoamPlots but this gets the job done and you have a much better control on the graphs I think

Last edited by vikramaditya91; July 29, 2016 at 04:34. Reason: incomplete
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Old   July 29, 2016, 07:10
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Quote:
Originally Posted by vikramaditya91 View Post
Hey McCharles, I am not sure if pyFoamPlots have that option while running a transient case.

http://www.cfd-online.com/Forums/ope...residuals.html

But if you haven't gone through the above link I suggest going through it thougroughly. Of course it isnt as straight forward as the pyFoamPlots but this gets the job done and you have a much better control on the graphs I think
Hi Vikramaditya, do you maybe know how to just plot the last iteration of a variable per timestep? For example, pressure makes several iterations per timestep and hence the plot contains all these values, as the word pressure is stated many times. I thought maybe to do a search for the last instance of the word but I'm not sure how to do this.

Greetings,

Bruno
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Old   July 29, 2016, 07:35
Default Convergence plot
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Hey Bruno, the post I referred to actually makes that distinction. But anyway, here is the code

Code:
set logscale y
set title "Residuals"
set ylabel 'Residual'
set xlabel 'Iteration'
plot "< cat log_parallel.txt | grep 'Solving for Urelx' | cut -d' ' -f9 | tr -d ','" title 'Urelx' with lines,\
     "< cat log_parallel.txt | grep 'Solving for Urely' | cut -d' ' -f9 | tr -d ','" title 'Urely' with lines,\
     "< cat log_parallel.txt | grep 'Solving for Urelz' | cut -d' ' -f9 | tr -d ','" title 'Urelz' with lines,\
     "< cat log_parallel.txt | grep 'Solving for p' | cut -d' ' -f9 | sed -n '0~6p'| tr -d ','" title 'p' with lines
pause 1
reread
You replace the 6 in '0~6p' to the number of corrections you make
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Old   July 29, 2016, 07:46
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Wow, thank you very much for your reply Vik !
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