[foamiste]

hello foamers,

I need to plot residuals with gnuplot in openFoam, I followed all instructions in this link http://www.cfd-online.com/Forums/ope...residuals.html but it doesn't work
I attached two files log and Residuals!! Can someone please plot it for me and then explain how did he do it?

[pupo]

Hi.

Are you running on windows or in Linux?

If you are using Linux, please remove the .txt extensions and run "gnuplot Residuals". It works, the problem is you are capturing all the pressure sub iterations, that's why you see way more pressure curves than velocity curves. In your case you 6 GAMG solver iterations per iteration, therefore, the "p" line should only present every 6th point.

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 p'  | cut -d' ' -f9 | tr -d ','" every 6 title 'p'   with lines
pause 1
reread

If you are using windows ( which i suspect you are because of the .txt) gnupot is not installed by default. how are you trying to run?

cheers

[foamiste]

I am using windows , i have installed gnuplot and i try to load "residuals" file and plot it and I get this error message "Bad data on line 1"

And for the extension .txt I just add it to load files here in this forum otherwise it can't be loaded

[pupo]

the problem is, this file mostly uses linux functions to parse the file.

every line of the log is read by a combo of

< cat log | grep 'Solving for Ux' | cut -d' ' -f9 | tr -d ','

Functions like cat, grep, cut, and tr are not available in windows

The only solution is for you to program your own parsing file using python, mathlab or something like that. And if you are doing that, you might just as well cut gnuplot completely and use either of those tools to plot the graphs.

I know there is a python residual script somewhere on the internet, but i've not been able to find it yet.

Good luck

[foamiste]

In fact i have a partition of linux in my computer.. I try with it to plot residuals but It doesn't respond .. I update gnuplot and I follow all the instructions but it react as if I don't give any command..

[pupo]

are you sure you have navigated to the folder where you have both the residuals and log files?

once there run "gnuplot Residuals" and the plot should pop.

In case you missed it, for the graph to look good for your particular case, Residuals should look like this:

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 p' | cut -d' ' -f9 | tr -d ','" every 6 title 'p'   with lines
pause 1
reread

[foamiste]

As you see I tried both of commands and I don't get anything

[pupo]

This is really weird. The command is running, you should see a gnuplot window popping up.

For example, have me running "gnuplot Residuals" in a folder "CFDProblem" containing only the 2 folders you have attached.

I'm sorry, i can't help any further

[foamiste]

Ok thank you

[Carno]

I have similar problem.
when I give command

gnuplot Residuals

Following output comes,

$ gnuplot Residuals -

plot "< cat log | grep 'Solving for p' | cut -d' ' -f9 | tr -d ','" title 'p' with lines,"< cat log | grep 'Solving f                                             or 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,"< c                                             at log | grep 'Solving for k' | cut -d' ' -f9 | tr -d ','" title 'k' with lines,"< cat log | grep 'time step continui                                             ty errors' | cut -d' ' -f9 | tr -d ','" title 'continuity error' with lines,"< cat log | grep 'Solving for omega' | c                                             ut -d' ' -f9 | tr -d ','" title 'omega' with lines
                                                                                                                                                                                                                                                                                                                                                                                                                                                     ^
"Residuals", line 11: Bad data on line 208 of file < cat log | grep 'Solving for k' | cut -d' ' -f9 | tr -d ','

Earlier I use to plot very nicely. Suddenly this started happening.
My Residual file is,

set logscale y
set title "Residuals"
set ylabel 'Residual'
set xlabel 'Iteration'
plot "< cat log | grep 'Solving for p' | cut -d' ' -f9 | tr -d ','" title 'p' with lines,\
"< 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 k' | cut -d' ' -f9 | tr -d ','" title 'k' with lines,\
"< cat log | grep 'time step continuity errors' | cut -d' ' -f9 | tr -d ','" title 'continuity error' with lines,\
"< cat log | grep 'Solving for omega' | cut -d' ' -f9 | tr -d ','" title 'omega' with lines

pause 1
reread

[manishm.cfd]

go to required directory

Depending on solver type following command to generate "log" folder
simpleFoam > log &

type following command to generate individual residual files like Ux_0,p_0 etc.

foamLog log >/dev/null


Now, Open gnuplot console and follow this

set logscale y
set title "Residuals"
set ylabel 'Residual'
set xlabel 'Iteration'

now for plotting Ux residues type following command
plot "logs/Ux_0" with lines,



Hope this helps


Now I am looking for "continuous residual plots as run goes on" in windows ( as we see it in any commercial tool)

[gigifumagalli]

Hello everyone!
Has anyone found a way to plot the residuals on windows?
Thanks

[crizpi21]

Originally Posted by foamiste

As you see I tried both of commands and I don't get anything

Hi foamiste, did you manage to solve your problem?
I am experiencing the same, when I run gnuplot Residuals in my Ubuntu shell for Windows 10 I don't get anything.

Hope someone can help me!

[mmohaqeqf]

Look here:
Plot the residuals using pyFoamPlotWatcher

[chriscabaq96]

Hello Community, I have problems with the residuals. I have the residuals and the log file, but when I put the command gnuplot residuals I have the following announcement:
Traceback (most recent call last):
File "/usr/lib/command-not-found", line 28, in <module>
from CommandNotFound import CommandNotFound
File "/usr/lib/python3/dist-packages/CommandNotFound/CommandNotFound.py", line 19, in <module>
from CommandNotFound.db.db import SqliteDatabase
File "/usr/lib/python3/dist-packages/CommandNotFound/db/db.py", line 5, in <module>
import apt_pkg
ImportError: /opt/OpenFOAM/OpenFOAM-v2012/ThirdParty/platforms/linux64/gcc-6.3.0/lib64/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by /lib/x86_64-linux-gnu/libapt-pkg.so.6.0)

Thanks in advance.
Christian