OpenFoam Plotting Issue

H@rry · June 21, 2018, 10:02

Good evening openFoamers. I have OpenFoam for Windows and i have an issue on how to plot residuals graphs. I searched for that and i found only for plotting in linux. Can anyone help ? Thank you.

student666 · June 22, 2018, 01:15

You should use the CLI commands (see user guide) 6.2.1.7

https://cfd.direct/openfoam/user-gui...#x31-2330006.2

and plot with gnuplot the .dat file e.g:

Code:

set terminal wxt 
set title "Ux residuals"   
set logscale y  
set grid 
set ylabel "Residuals" 
set xlabel "Iterations" 
plot 'residuals.dat' u 1 2 w l (explanations of the command line? use google for gnuplotting)

RobertHB · June 22, 2018, 05:26

Hello Harry,
can you use the residual function object? See e.g. here (section 6.3.4, for OF 5.x) and here (for OF v1712).

H@rry · June 25, 2018, 14:48

Thank you very much. I will check it now and i will reply to you. I am sorry for the delay.

H@rry · June 25, 2018, 14:57

Mr. student666, I checked your advice but still nothing happens. I try to plot Ux versus the height of my channel and I can't do it. Your help would be greatful if you know how to do it.

Thank you very much

H@rry · June 25, 2018, 15:00

Mr Robert, the function is "streamlines" in my case.

RobertHB · June 26, 2018, 05:29

Quote:

Originally Posted by H@rry

Mr Robert, the function is "streamlines" in my case.

I'm sorry, but i don't understand your quote. Obviously streamlines is something different than residuals.

H@rry · June 26, 2018, 06:26

Mr Robert, I can use the residual function but i can't plot Ux versus height of the channel in different pissitions of x (along the length and height of the channel).

RobertHB · June 26, 2018, 06:35

Quote:

Originally Posted by H@rry

[...]but i can't plot Ux versus height of the channel in different pissitions of x (along the length and height of the channel).

Which is no area of application of the residual function object. To plot profiles of Ux (or any other variable) take a look at the singleGraph function (see section 6.3.2.). For postprocessing you can use paraview's plot over line filter.

H@rry · June 26, 2018, 09:15

I will check it out. Thank you very much.

June 21, 2018, 10:02	OpenFoam Plotting Issue	#1
H@rry New Member Harry Join Date: Feb 2018 Posts: 6 Rep Power: 8	Good evening openFoamers. I have OpenFoam for Windows and i have an issue on how to plot residuals graphs. I searched for that and i found only for plotting in linux. Can anyone help ? Thank you.

June 22, 2018, 01:15		#2
student666 Senior Member M. C. Join Date: May 2013 Location: Italy Posts: 286 Blog Entries: 6 Rep Power: 17	You should use the CLI commands (see user guide) 6.2.1.7 https://cfd.direct/openfoam/user-gui...#x31-2330006.2 and plot with gnuplot the .dat file e.g: Code: set terminal wxt set title "Ux residuals" set logscale y set grid set ylabel "Residuals" set xlabel "Iterations" plot 'residuals.dat' u 1 2 w l (explanations of the command line? use google for gnuplotting) H@rry likes this.

June 22, 2018, 05:26		#3
RobertHB Senior Member Robert Join Date: May 2015 Location: Bremen, GER Posts: 292 Rep Power: 12	Hello Harry, can you use the residual function object? See e.g. here (section 6.3.4, for OF 5.x) and here (for OF v1712). H@rry likes this.

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June 25, 2018, 14:48		#4
H@rry New Member Harry Join Date: Feb 2018 Posts: 6 Rep Power: 8	Thank you very much. I will check it now and i will reply to you. I am sorry for the delay.

June 25, 2018, 14:57		#5
H@rry New Member Harry Join Date: Feb 2018 Posts: 6 Rep Power: 8	Mr. student666, I checked your advice but still nothing happens. I try to plot Ux versus the height of my channel and I can't do it. Your help would be greatful if you know how to do it. Thank you very much

June 25, 2018, 15:00		#6
H@rry New Member Harry Join Date: Feb 2018 Posts: 6 Rep Power: 8	Mr Robert, the function is "streamlines" in my case.

June 26, 2018, 06:26		#8
H@rry New Member Harry Join Date: Feb 2018 Posts: 6 Rep Power: 8	Mr Robert, I can use the residual function but i can't plot Ux versus height of the channel in different pissitions of x (along the length and height of the channel).

June 26, 2018, 09:15		#10
H@rry New Member Harry Join Date: Feb 2018 Posts: 6 Rep Power: 8	I will check it out. Thank you very much.