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February 14, 2014, 05:34 
Residual Plotting Script

#1 
Senior Member
Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,287
Rep Power: 18 
Hi all,
I made some handy script to plot residuals during runtime using gnuplot. It works with SIMPLE and PIMPLE, probably also with other solvers. First of all, you need to get the OpenFOAM terminal output into a file. This is done by starting OpenFoam with the ">log" command, such as: mpirun np 4 pimpleFoam parallel >log or just simple >log where "log" is the name of the file with the output. Now, create some new file "plotscript" in the same folder and copy this text into it: Code:
set logscale y set title "Residuals" set ylabel 'Residual' set xlabel 'Iteration' set key outside set grid nCorrectors=1 nNonOrthogonalCorrectors=3 nCont = nCorrectors nP = (nNonOrthogonalCorrectors+1)*nCont nPSkip = nP1 nContSkip = nCont1 plot "< cat log  grep 'Solving for Ux'  cut d' ' f9  tr d ','" title 'Ux' with linespoints,\ "< cat log  grep 'Solving for Uy'  cut d' ' f9  tr d ','" title 'Uy' with linespoints,\ "< cat log  grep 'Solving for Uz'  cut d' ' f9  tr d ','" title 'Uz' with linespoints,\ "< cat log  grep 'Solving for k'  cut d' ' f9  tr d ','" title 'k' with linespoints,\ "< cat log  grep 'Solving for epsilon'  cut d' ' f9  tr d ','" title 'epsilon' with linespoints,\ "< cat log  grep 'time step continuity errors :'  cut d' ' f9  tr d ','" every nCont::nContSkip title 'continuity' with linespoints,\ "< cat log  grep 'Solving for p'  cut d' ' f9  tr d ','" every nP::nPSkip title 'p' with linespoints lc 8 pause 1 xmax = GPVAL_DATA_X_MAX+2 xmin = xmax40 set xrange [xmin:xmax] reread You need to adapt the upper two numbers nCorrectors and nNonOrthogonalCorrectors to your case, because they need to delete all the intermediate steps of the pressure solving. Also, for long runs I implemented the stuff between "pause 1" and "reread" which will show only the last 40 steps. You can change it to any number or switch off completely by putting a "#" at the beginning of each line. Of course, change "epsilon" to "omega" if you use some komega turbulence model. Have fun, Philipp.
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February 14, 2014, 10:42 

#2 
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Joachim Herb
Join Date: Sep 2010
Posts: 354
Rep Power: 10 
Using your code I get the following error message:
Code:
"Residuals", line 26: undefined variable: GPVAL_DATA_X_MAX > gnuplot version gnuplot 4.2 patchlevel 3 

February 14, 2014, 11:09 

#3 
Senior Member
Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,287
Rep Power: 18 
Hi Joachim,
I got two ideas: i) Your version is too old, I use 4.6 ii) The initial "plot" command did not work. Variable "GPVAL_DATA_X_MAX" is created by gnuplot after a plot was successfully done. Thus, if the lines before didn't work for some reason, also the GPVAL_DATA_X_MAX variable is not known. Does the script run without these three lines?
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February 14, 2014, 18:40 

#4 
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Joachim Herb
Join Date: Sep 2010
Posts: 354
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If I remove the three lines between pause and reread the script works.


February 17, 2014, 05:27 

#5 
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Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,287
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Hi,
You can start a gnuplot terminal gnuplot Then just do some random plot plot 1 and let gnuplot show all the created variables show variables all Does it show the GPVAL_DATA_X_MAX?
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February 17, 2014, 05:45 

#6  
Senior Member
Joachim Herb
Join Date: Sep 2010
Posts: 354
Rep Power: 10 
Quote:
Actually, no: Code:
gnuplot> show variables all All available variables: pi = 3.14159265358979 NaN = NaN GNUTERM = "x11" GPVAL_TERM = "x11" GPVAL_TERMOPTIONS = "" GPVAL_OUTPUT = "" GPVAL_VERSION = 4.2 GPVAL_PATCHLEVEL = "3 " GPVAL_COMPILE_OPTIONS = "READLINE +LIBREADLINE +HISTORY +BACKWARDS_COMPATIBILITY +BINARY_DATA \n+GD_PNG +GD_JPEG +GD_TTF +GD_GIF +ANIMATION \n+NOCWDRC +X11 +X11_POLYGON +MULTIBYTE +USE_MOUSE +GNUGRAPH +HIDDEN3D_QUADTREE \n+DATASTRINGS +HISTOGRAMS +OBJECTS +STRINGVARS +MACROS +THIN_SPLINES +IMAGE \n" GPVAL_X_MIN = 10.0 GPVAL_X_MAX = 10.0 GPVAL_X_REVERSE = 0 GPVAL_X_LOG = 0.0 GPVAL_Y_MIN = 0.99 GPVAL_Y_MAX = 1.01 GPVAL_Y_REVERSE = 0 GPVAL_Y_LOG = 0.0 GPVAL_X2_MIN = 10.0 GPVAL_X2_MAX = 10.0 GPVAL_X2_REVERSE = 0 GPVAL_X2_LOG = 0.0 GPVAL_Y2_MIN = 0.99 GPVAL_Y2_MAX = 1.01 GPVAL_Y2_REVERSE = 0 GPVAL_Y2_LOG = 0.0 GPVAL_Z_MIN = 10.0 GPVAL_Z_MAX = 10.0 GPVAL_Z_REVERSE = 0 GPVAL_Z_LOG = 0.0 GPVAL_CB_MIN = 8.98846567431158e+307 GPVAL_CB_MAX = 8.98846567431158e+307 GPVAL_CB_REVERSE = 0 GPVAL_CB_LOG = 0.0 GPVAL_T_MIN = 5.0 GPVAL_T_MAX = 5.0 GPVAL_T_REVERSE = 0 GPVAL_T_LOG = 0.0 GPVAL_U_MIN = 10.0 GPVAL_U_MAX = 10.0 GPVAL_U_REVERSE = 0 GPVAL_U_LOG = 0.0 GPVAL_V_MIN = 10.0 GPVAL_V_MAX = 10.0 GPVAL_V_REVERSE = 0 GPVAL_V_LOG = 0.0 

February 17, 2014, 05:54 

#7 
Senior Member
Joachim Herb
Join Date: Sep 2010
Posts: 354
Rep Power: 10 
Ok, with the current version of gnuplot (4.6.4) it is working.
Thank your for the script. 

February 17, 2014, 05:56 

#8 
Senior Member
Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,287
Rep Power: 18 
You could have changed the GPVAL_DATA_X_MAX to GPVAL_X_MAX?
Seems like they renamed that in the newer versions...
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