[Sargam05]

Hello everyone,

I am using OpenFOAM-ext for the stressAnalysis problem. I have successfully used Residual script to plot gnuplot in OpenFOAM1.7.1. I have made changes in the Residual script based on OpenFAOM-ext log file but it is showing some error.

Following is the log file in my case:

Time: 1

Time 1, Corrector 0, Solving for U using DICPCG, residual = 1, relative residual = 59362.4

Time 1, Solving for U, Initial residual = 1, Final residual = 1, Relative residual = 59362.4, No outer iterations 1
ExecutionTime = 26.44 s ClockTime = 27 s
ExecutionTime = 26.6 s


Time: 2

Time 2, Corrector 0, Solving for U using DICPCG, residual = 1, relative residual = 1

Time 2, Solving for U, Initial residual = 1, Final residual = 1, Relative residual = 1, No outer iterations 1
ExecutionTime = 37.93 s ClockTime = 38 s
ExecutionTime = 38.12 s


Time: 3

Time 3, Corrector 0, Solving for U using DICPCG, residual = 0.305633, relative residual = 1

Time 3, Solving for U, Initial residual = 0.305633, Final residual = 0.305633, Relative residual = 1, No outer iterations 1
ExecutionTime = 54.7 s ClockTime = 55 s
ExecutionTime = 54.9 s


Time: 4

Time 4, Corrector 0, Solving for U using DICPCG, residual = 0.229696, relative residual = 1

Time 4, Solving for U, Initial residual = 0.229696, Final residual = 0.229696, Relative residual = 1, No outer iterations 1
ExecutionTime = 66.4 s ClockTime = 67 s
ExecutionTime = 66.59 s


Time: 5

Time 5, Corrector 0, Solving for U using DICPCG, residual = 0.155004, relative residual = 1

Time 5, Solving for U, Initial residual = 0.155004, Final residual = 0.155004, Relative residual = 1, No outer iterations 1
ExecutionTime = 83.12 s ClockTime = 83 s
ExecutionTime = 83.3 s


Time: 6

Time 6, Corrector 0, Solving for U using DICPCG, residual = 0.088822, relative residual = 1

Time 6, Solving for U, Initial residual = 0.088822, Final residual = 0.088822, Relative residual = 1, No outer iterations 1
ExecutionTime = 96.02 s ClockTime = 96 s
ExecutionTime = 96.21 s


Time: 7

Time 7, Corrector 0, Solving for U using DICPCG, residual = 0.0763407, relative residual = 1

Time 7, Solving for U, Initial residual = 0.0763407, Final residual = 0.0763407, Relative residual = 1, No outer iterations 1
ExecutionTime = 109.27 s ClockTime = 110 s
ExecutionTime = 109.45 s


Time: 8

Time 8, Corrector 0, Solving for U using DICPCG, residual = 0.0426613, relative residual = 1

Time 8, Solving for U, Initial residual = 0.0426613, Final residual = 0.0426613, Relative residual = 1, No outer iterations 1
ExecutionTime = 121.37 s ClockTime = 122 s
ExecutionTime = 121.57 s


The script I am using to plot gnuplot is:

set terminal png
set output "filename.png"

set logscale y
set title "Residuals"
set ylabel 'Residual'
set xlabel 'Time'
cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'U' with lines
pause 1
reread


It is showing following error:

cat log | grep 'Solving for U' | cut -d' ' -f9
^
"Residuals", line 8: invalid command

sangeeta@sangeeta-laptop:~/Desktop/plateHole0.0001stress$ gnuplot Residuals

cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'Ux' with lines"
^
"Residuals", line 8: invalid command

sangeeta@sangeeta-laptop:~/Desktop/plateHole0.0001stress$ gnuplot Residuals

cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'Ux' with lines"
^
"Residuals", line 8: invalid command


Am I using wrong script? Can anyone explain how I can change the script to plot residual gnuplot based on log file (which I have mentioned above)?

Best regards,
Sangeeta

[Tushar@cfd]

Originally Posted by Sargam05

Hello everyone,

I am using OpenFOAM-ext for the stressAnalysis problem. I have successfully used Residual script to plot gnuplot in OpenFOAM1.7.1. I have made changes in the Residual script based on OpenFAOM-ext log file but it is showing some error.

Following is the log file in my case:

Time: 1

Time 1, Corrector 0, Solving for U using DICPCG, residual = 1, relative residual = 59362.4

Time 1, Solving for U, Initial residual = 1, Final residual = 1, Relative residual = 59362.4, No outer iterations 1
ExecutionTime = 26.44 s ClockTime = 27 s
ExecutionTime = 26.6 s


Time: 2

Time 2, Corrector 0, Solving for U using DICPCG, residual = 1, relative residual = 1

Time 2, Solving for U, Initial residual = 1, Final residual = 1, Relative residual = 1, No outer iterations 1
ExecutionTime = 37.93 s ClockTime = 38 s
ExecutionTime = 38.12 s


Time: 3

Time 3, Corrector 0, Solving for U using DICPCG, residual = 0.305633, relative residual = 1

Time 3, Solving for U, Initial residual = 0.305633, Final residual = 0.305633, Relative residual = 1, No outer iterations 1
ExecutionTime = 54.7 s ClockTime = 55 s
ExecutionTime = 54.9 s


Time: 4

Time 4, Corrector 0, Solving for U using DICPCG, residual = 0.229696, relative residual = 1

Time 4, Solving for U, Initial residual = 0.229696, Final residual = 0.229696, Relative residual = 1, No outer iterations 1
ExecutionTime = 66.4 s ClockTime = 67 s
ExecutionTime = 66.59 s


Time: 5

Time 5, Corrector 0, Solving for U using DICPCG, residual = 0.155004, relative residual = 1

Time 5, Solving for U, Initial residual = 0.155004, Final residual = 0.155004, Relative residual = 1, No outer iterations 1
ExecutionTime = 83.12 s ClockTime = 83 s
ExecutionTime = 83.3 s


Time: 6

Time 6, Corrector 0, Solving for U using DICPCG, residual = 0.088822, relative residual = 1

Time 6, Solving for U, Initial residual = 0.088822, Final residual = 0.088822, Relative residual = 1, No outer iterations 1
ExecutionTime = 96.02 s ClockTime = 96 s
ExecutionTime = 96.21 s


Time: 7

Time 7, Corrector 0, Solving for U using DICPCG, residual = 0.0763407, relative residual = 1

Time 7, Solving for U, Initial residual = 0.0763407, Final residual = 0.0763407, Relative residual = 1, No outer iterations 1
ExecutionTime = 109.27 s ClockTime = 110 s
ExecutionTime = 109.45 s


Time: 8

Time 8, Corrector 0, Solving for U using DICPCG, residual = 0.0426613, relative residual = 1

Time 8, Solving for U, Initial residual = 0.0426613, Final residual = 0.0426613, Relative residual = 1, No outer iterations 1
ExecutionTime = 121.37 s ClockTime = 122 s
ExecutionTime = 121.57 s


The script I am using to plot gnuplot is:

set terminal png
set output "filename.png"

set logscale y
set title "Residuals"
set ylabel 'Residual'
set xlabel 'Time'
cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'U' with lines
pause 1
reread


It is showing following error:

cat log | grep 'Solving for U' | cut -d' ' -f9
^
"Residuals", line 8: invalid command

sangeeta@sangeeta-laptop:~/Desktop/plateHole0.0001stress$ gnuplot Residuals

cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'Ux' with lines"
^
"Residuals", line 8: invalid command

sangeeta@sangeeta-laptop:~/Desktop/plateHole0.0001stress$ gnuplot Residuals

cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'Ux' with lines"
^
"Residuals", line 8: invalid command


Am I using wrong script? Can anyone explain how I can change the script to plot residual gnuplot based on log file (which I have mentioned above)?

Best regards,
Sangeeta

You missed to use the keywords: plot "< before your command.
plot "< cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'U' with lines

[Tushar@cfd]

Also, refer the following page:

Tutorial of how to plot residuals !

[Sargam05]

Hi Tushar,

Thank so much for the inputs. I have used "plot" as you suggested:

set terminal png
set output "filename.png"
set logscale y
set title "Residuals"
set ylabel 'Residual'
set xlabel 'Iteration'
plot "< cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'U' with lines
pause 1
reread

but still it is showing following error:

plot "< cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'U' with lines
^
"Residuals", line 8: Bad data on line 1

I did go through some posts for plotting gnuplot for residuals and I have tried to do this as mentioned in the posts but still it is showing some error. Do you have any idea way it is coming?

Thanks,
Sangeeta

[Tushar@cfd]

Originally Posted by Sargam05

Hi Tushar,

Thank so much for the inputs. I have used "plot" as you suggested:

set terminal png
set output "filename.png"
set logscale y
set title "Residuals"
set ylabel 'Residual'
set xlabel 'Iteration'
plot "< cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'U' with lines
pause 1
reread

but still it is showing following error:

plot "< cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'U' with lines
^
"Residuals", line 8: Bad data on line 1

I did go through some posts for plotting gnuplot for residuals and I have tried to do this as mentioned in the posts but still it is showing some error. Do you have any idea way it is coming?

Thanks,
Sangeeta

Try these steps.. I always follow these for plotting residuals.


Open the case folder in your console window (terminal).

execute the $application (for eg. icoFoam or any $Foam which you are using) and simultaneously write a log file using the following command in the terminal:

$application >log

Then open gnuplot in the same console window, and execute the following command:

set logscale y
set title "Residuals"
set ylabel 'Residual'
set xlabel 'Iteration'
plot "< cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'U' with lines
pause 1
reread

I wish this will solve your problem.

[Tushar@cfd]

Try to edit your output log file like the following and then follow the procedure as mentioned in my earlier post....


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0

Reading transportProperties

Reading field p

Reading field U

Reading/calculating face flux field phi


Starting time loop

Time: 1

Solving for U using DICPCG, Initial residual = 1, Final residual = 1, Relative residual = 59362.4, No outer iterations 1
ExecutionTime = 26.44 s ClockTime = 27 s
ExecutionTime = 26.6 s


Time: 2

Solving for U using DICPCG, Initial residual = 1, Final residual = 1, Relative residual = 1, No outer iterations 1
ExecutionTime = 37.93 s ClockTime = 38 s
ExecutionTime = 38.12 s


Time: 3

Solving for U using DICPCG, Initial residual = 0.305633, Final residual = 0.305633, Relative residual = 1, No outer iterations 1
ExecutionTime = 54.7 s ClockTime = 55 s
ExecutionTime = 54.9 s


Time: 4

Solving for U using DICPCG, Initial residual = 0.229696, Final residual = 0.229696, Relative residual = 1, No outer iterations 1
ExecutionTime = 66.4 s ClockTime = 67 s
ExecutionTime = 66.59 s


Time: 5

Solving for U using DICPCG, Initial residual = 0.155004, Final residual = 0.155004, Relative residual = 1, No outer iterations 1
ExecutionTime = 83.12 s ClockTime = 83 s
ExecutionTime = 83.3 s

Time: 6

Solving for U using DICPCG, Initial residual = 0.088822, Final residual = 0.088822, Relative residual = 1, No outer iterations 1
ExecutionTime = 96.02 s ClockTime = 96 s
ExecutionTime = 96.21 s


Time: 7

Solving for U using DICPCG, Initial residual = 0.0763407, Final residual = 0.0763407, Relative residual = 1, No outer iterations 1
ExecutionTime = 109.27 s ClockTime = 110 s
ExecutionTime = 109.45 s


Time: 8

Solving for U using DICPCG, Initial residual = 0.0426613, Final residual = 0.0426613, Relative residual = 1, No outer iterations 1
ExecutionTime = 121.37 s ClockTime = 122 s
ExecutionTime = 121.57 s

#########

I think that was the problem with your case, I hope now you are able to plot.

[Sargam05]

Hi Tushar,

Thank you so much for the suggestions! I have edited some of the initial part of the log file and used the command you mentioned in gnuplot but it is still showing following error:

Terminal type set to 'wxt'
gnuplot> set logscale y
gnuplot> set title "Residuals"
gnuplot> set ylabel 'Residual'
gnuplot> set xlabel 'Iteration'
gnuplot> plot "< cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'U' with lines
^
Bad data on line 1

gnuplot> pause 1
gnuplot> reread

I do not know if something is wrong in logs file. I am also attaching the log and logs folders as attachment. Please let me know if something is wrong in these folders.

Best regards,
Sangeeta

[Tushar@cfd]

Originally Posted by Sargam05

Hi Tushar,

Thank you so much for the suggestions! I have edited some of the initial part of the log file and used the command you mentioned in gnuplot but it is still showing following error:

Terminal type set to 'wxt'
gnuplot> set logscale y
gnuplot> set title "Residuals"
gnuplot> set ylabel 'Residual'
gnuplot> set xlabel 'Iteration'
gnuplot> plot "< cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'U' with lines
^
Bad data on line 1

gnuplot> pause 1
gnuplot> reread

I do not know if something is wrong in logs file. I am also attaching the log and logs folders as attachment. Please let me know if something is wrong in these folders.

Best regards,
Sangeeta

Can you please upload the controlDict file?

[billie]

Originally Posted by Sargam05

Time: 8

Time 8, Corrector 0, Solving for U using DICPCG, residual = 0.0426613, relative residual = 1

Time 8, Solving for U, Initial residual = 0.0426613, Final residual = 0.0426613, Relative residual = 1, No outer iterations 1
ExecutionTime = 121.37 s ClockTime = 122 s
ExecutionTime = 121.57 s

Originally Posted by Sargam05

gnuplot> plot "< cat log | grep 'Solving for U' | cut -d' ' -f9 | tr -d ','" title 'U' with lines
^
Bad data on line 1

You grep for 'Solving for U' split by space and use the 9th field but as you can see there are different lines in your log file containing the grep string. The problem is for the line with the corrector the 9th field is "DICPCG" and gnuplot only works with numbers. You have restrict your grep string so it only matches the line with your residual.

[Sargam05]

Hi Tushar and Daniel,

Thank you for the reply. Tushar please find controlDict file as attachment.

Daniel even after changing the script based on log file following error is comping:

plot "< cat log | grep 'Solving for U using DICPCG' | cut -d' ' -f9 | tr -d ','" title 'U' with lines
^
"Residuals", line 8: Bad data on line 1

[billie]

Originally Posted by Sargam05

Hi Tushar and Daniel,

Thank you for the reply. Tushar please find controlDict file as attachment.

Daniel even after changing the script based on log file following error is comping:

plot "< cat log | grep 'Solving for U using DICPCG' | cut -d' ' -f9 | tr -d ','" title 'U' with lines
^
"Residuals", line 8: Bad data on line 1

It is always a good idea to test this first in a console.

Check the output of:

cat log | grep 'Solving for U using DICPCG' | cut -d' ' -f9 | tr -d ','

It should give you a series of "DICPCG". This is because the line you are grepping for the residual is in field 12 and not in field 9. So you can either use

cat log | grep 'Solving for U using DICPCG' | cut -d' ' -f12 | tr -d ','

or

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

[Sargam05]

Hi Daniel,

Thank you so much for the suggestions. Now it plotting residuals. I appreciate your help!

I also like to thank Tushar for his inputs.

Best regards,
Sangeeta

[Tushar@cfd]

Originally Posted by Sargam05

Hi Daniel,

Thank you so much for the suggestions. Now it plotting residuals. I appreciate your help!

I also like to thank Tushar for his inputs.

Best regards,
Sangeeta

It's good to see, you are getting your residual plots.