[mmohaqeqf]

Hi guys;


I am using OpenFOAM version 2006 (20 06) in Windows 10, through Ubuntu 18.04 (Ubuntu 18.04.2 LTS, bionic, bash version 4.4.19(1)-release).


The OpenFOAM itself has been running flawlessly so far.

My question is about setting up the requirements to use pyFoamPlotWatcher to monitor the residuals from simpleFoam.


So, I ran one of my cases and also output a log file called log.simpleFoam in my case directory. When I type pyFoamPlotWatcher.py log.simpleFoam in the bash, first the bash opens the log file and at the end it says:


gnuplot: unable to open display ''
gnuplot: X11 aborted.


I currently have python (Version 3.8.0a1), gnuplot (Version 5.2 patchlevel 8), and Xming (Version 6.9), installed on my windows.


I have been spending the last 5 hours digging into different discussion forums, but have been unable to come up with a solution for my issue.


I have also taken a look at this post (Tutorial of how to plot residuals !), which did not help me much.


Any help is appreciated.


Thanks

[mmohaqeqf]

Ok I found the answer for my own question, so I am posting the solution here in case others get stuck with similar issue.

Please refer to the following link for the solution:


https://askubuntu.com/questions/9488...-on-windows-10

[mmohaqeqf]

Just a few more points for future reference, in order to be able to plot anything using gnuplot from the bash that is installed within the windows:


1) You need gnuplot only installed on your bash, not on your windows.


2) You need Xming on your windows, not on your bash.


3) You need to add the following line to your bashrc (and source it once) to set a terminal for the gnuplot to be able to show the plots:


export DISPLAY=:0 gnuplot



Note: Make sure the Xming is active and running on your Windows (double click on the Xming icon and look at the taskbar to make sure it is running) when you try to plot residuals from the bash terminal.


Hope this information helps some one.

[OlivierM]

Originally Posted by mmohaqeqf

Just a few more points for future reference, in order to be able to plot anything using gnuplot from the bash that is installed within the windows:


1) You need gnuplot only installed on your bash, not on your windows.


2) You need Xming on your windows, not on your bash.


3) You need to add the following line to your bashrc (and source it once) to set a terminal for the gnuplot to be able to show the plots:


export DISPLAY=:0 gnuplot



Note: Make sure the Xming is active and running on your Windows (double click on the Xming icon and look at the taskbar to make sure it is running) when you try to plot residuals from the bash terminal.


Hope this information helps some one.

Hi,

I am a bit lost because your last step is:
export DISPLAY=:0 gnuplot

but in tle link you shared the last step was:
export DISPLAY=localhost:0.0

and then the way you succeed to monitor the residuals remains unclear for me.

do you use a script ?
which command do you use ?
do you launch a specific program ?

I am able to run simpleFoam but all I have tested so far, pyFoam or gnuplot, has failed ...

would you mind clarifying your monitoring process ?

thanks

[mmohaqeqf]

Originally Posted by OlivierM

Hi,

I am a bit lost because your last step is:
export DISPLAY=:0 gnuplot

but in tle link you shared the last step was:
export DISPLAY=localhost:0.0

and then the way you succeed to monitor the residuals remains unclear for me.

do you use a script ?
which command do you use ?
do you launch a specific program ?

I am able to run simpleFoam but all I have tested so far, pyFoam or gnuplot, has failed ...

would you mind clarifying your monitoring process ?

thanks

Hi there;
Regarding the link I sent in the above post, I was talking about the answer by the user Ptheguy.


Regarding the plotting itself, first you have to make sure you are logging the residuals from the simpleFoam. When you want to run simpleFoam, use the following command, this will create a log file:


$ simpleFoam > log.simpleFoam


(NOTE: you don't need to type the $ sign; it is actually the prompt!)



Once the simulation is finished, make sure the log.simpleFoam is present in your case root directory. Then run the following command (make sure Xming is running in your Windows before running the following command):


$ pyFoamPlotWatcher.py log.simpleFoam



(NOTE= depending on your system setting, you may not need to use .py at the end of the pyFoamPlotWatcher. If you use the tab to auto-complete the command, the auto-complete tells you which one you have to use.)


Let me know if it works for you.

[OlivierM]

Hi,
thanks for your help

I did it on the icoFoam cavity case.

The log.icoFoam goes properly in the case root directory.
Also 'VcXsrv windows xserver' is running (which includes Xming)

Then here is what I got whit the command 'pyFoamPlotWatcher.py':

#
$ pyFoamPlotWatcher.py log.icoFoam

> Traceback (most recent call last):
File "/usr/local/bin/pyFoamPlotWatcher.py", line 4, in <module>
__import__('pkg_resources').run_script('PyFoam==20 20.5', 'pyFoamPlotWatcher.py')
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 667, in run_script
self.require(requires)[0].run_script(script_name, ns)
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 1452, in run_script
raise ResolutionError(pkg_resources.ResolutionError: Script 'scripts/pyFoamPlotWatcher.py' not found in metadata at
'/home/<USER>/.local/lib/python3.8/site-packages/PyFoam-2020.5.dist-info'
#

Do you have any idea of what's going on ?

[mmohaqeqf]

Originally Posted by OlivierM

Hi,
thanks for your help

I did it on the icoFoam cavity case.

The log.icoFoam goes properly in the case root directory.
Also 'VcXsrv windows xserver' is running (which includes Xming)

Then here is what I got whit the command 'pyFoamPlotWatcher.py':

#
$ pyFoamPlotWatcher.py log.icoFoam

> Traceback (most recent call last):
File "/usr/local/bin/pyFoamPlotWatcher.py", line 4, in <module>
__import__('pkg_resources').run_script('PyFoam==20 20.5', 'pyFoamPlotWatcher.py')
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 667, in run_script
self.require(requires)[0].run_script(script_name, ns)
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 1452, in run_script
raise ResolutionError(pkg_resources.ResolutionError: Script 'scripts/pyFoamPlotWatcher.py' not found in metadata at
'/home/<USER>/.local/lib/python3.8/site-packages/PyFoam-2020.5.dist-info'
#

Do you have any idea of what's going on ?

Try typing pyFoamPlotW (note that it is missing the last few letters) and then hit tab, if it doesn't auto complete it, then it means you don't have pyFoam installed.


More info: https://openfoamwiki.net/index.php/Contrib/PyFoam


Otherwise, I am not really sure where the issue is coming from.

[Sakun]

Originally Posted by OlivierM

Hi,
thanks for your help

I did it on the icoFoam cavity case.

The log.icoFoam goes properly in the case root directory.
Also 'VcXsrv windows xserver' is running (which includes Xming)

Then here is what I got whit the command 'pyFoamPlotWatcher.py':

#
$ pyFoamPlotWatcher.py log.icoFoam

> Traceback (most recent call last):
File "/usr/local/bin/pyFoamPlotWatcher.py", line 4, in <module>
__import__('pkg_resources').run_script('PyFoam==20 20.5', 'pyFoamPlotWatcher.py')
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 667, in run_script
self.require(requires)[0].run_script(script_name, ns)
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 1452, in run_script
raise ResolutionError(pkg_resources.ResolutionError: Script 'scripts/pyFoamPlotWatcher.py' not found in metadata at
'/home/<USER>/.local/lib/python3.8/site-packages/PyFoam-2020.5.dist-info'
#

Do you have any idea of what's going on ?

did you mange to get the solution ?

[denbjornen]

Thought I'd chime in.

I've never had luck using a Windows X Server like XMing, VcXsrv, etc (maybe got it to work once on one of my machines after hours and hours of testing). I've found an excellent tutorial on using an RDP connection to your WSL Ubuntu instance that works much better.

This video shows how to setup xrdp on WSL Ubuntu. This solution is much easier to achieve, and produced no errors for me. I'll post the steps followed here, in case this video gets taken down.

# Refresh/upgrade apt/ubuntu

sudo apt update && sudo apt -y upgrade

# Install xrdp

sudo apt install xrdp

# Install our desktop "xfce4" use another if you like

sudo apt install -y xfce4

Select "gdm3" when prompted

# Install additional goodies for xfce4

sudo apt install -y xfce4-goodies

# Make Changes to the xfce4 configuration. Primarily, we are changing the screen resolution and default connection port from 3389 to 3390. This is recommended but not necessary

sudo cp /etc/xrdp/xrdp.ini /etc/xrdp/xrdp.ini.bak
sudo sed -i 's/3389/3390/g' /etc/xrdp/xrdp.ini
sudo sed -i 's/max_bpp=32/#max_bpp=32\nmax_bpp=128/g' /etc/xrdp/xrdp.ini

# Edit the startup script

sudo nano /etc/xrdp/startwm.sh

Comment out the last two lines
Add the line:

startxfce4

# Save changes to the xsession

echo xfce4-session > ~/.xsession

# Start the xrdp server

sudo /etc/init.d/xrdp start

# Access ubuntu via the xrdp server on windows
Open up RDP (Remote Desktop Connection)
Address: localhost:3390 (or default port 3389, or whatever you changed it to)
Login using your ubuntu credentials.

As long as you have gnuplot, etc installed, you should be able to run your commands via this RDP and have zero issues getting UIs like gnuplot to work.

Happy foaming.