1- Install Code Saturne

mkdir code_saturne
cd code_saturne/
git clone https://github.com/code-saturne/code_saturne.git
./sbin/bootstrap

#Install Pre-requisites if needed
Install Python and then PyQt5 (apt-get install python3-PyQt5)

#Create a build folder and launch the install script:
mkdir ../code_saturne_build
cd ../code_saturne_build
./install_saturne.py

#Edit the setup file and replace "no" by "yes" to download and install the pre-requisites
It should look like this
Name Use Install Path
hdf5 yes yes none
cgns yes yes none
med yes yes none
scotch yes yes none
parmetis yes yes none

#Then save and launch again the script
./install_saturne.py

If everything goes well, Code_Saturne should be installed now
If you get error messages, look at them to debug

#Open and past the following in your .bashrc
cspath=/home/cyprien/Code_Saturne/7.0.4/code_saturne-7.0.4/arch/Linux_x86_64/bin
alias code_saturne="$cspath/code_saturne"

You should now be able to open code_saturne with the "code_saturne" command
(reload your terminal first)

2- Install Salome

Download and untar the SALOME-9.8.0-native-UB20.04-SRC archive

#Check prerequisites
[code]cd SALOME-9.8.0-native-UB20.04-SRC
./sat config SALOME-9.8.0-native --check_system[/code]

#Install what's missing with synaptic

Launch the script ./install_bin.sh
This will create an INSTALL folder with all the binaries

#You should now be able to launch salome with:
./salome

#If you get problem with libQt5Core.so.5
i.e you get error message:
libqt5core.so.5 version qt_5.15 not found (or something similar)

You have 2 ways to install PyQt5
Either using pip (pip install PyQt5)
Or using apt-get (apt-get install python3-pyqt5)
If you install both, you will have some conflict, so uninstall the one installed with pip and that should solve the problem
pip uninstall PyQt5

3- Install Salome-CFD-Extension

#clone the repository
git clone https://github.com/code-saturne/salome_cfd_extensions.git

cd salome_cfd_extensions/
#If you are using Code_Saturne 7.0 or above you need to switch to the v7.0 branch
git checkout v7.0


Go into the salome_cfd_extensions repository
#This command is not mentioned in the doc, but it is important to initialize some files
./sbin/bootstrap

#Create an env variable to tell were your Salome folder is located
export SALOME_ROOT_DIR=/home/cyprien/salome/SALOME-9.8.0-native-UB20.04-SRC

#Load Salome Environment
$SALOME_ROOT_DIR/salome shell

You should see the beginning of the terminal promt change and display:
[NS=no_host:no_port]$

#From there, you need to create the following env variables so
export CS_ROOT_DIR=/home/cyprien/Code_Saturne/7.0.2/code_saturne-7.0.2/arch/Linux_x86_64/bin
export CFDMODULE_ROOT_DIR=/home/cyprien/salome/salome_cfd_extensions/cfd_study

#make sure you are located in the salome_cfd_extensions directory
#you can use the ubuntu "pwd" command to check

./configure --with-salome=$SALOME_ROOT_DIR

Check the log to make sure there is no error and check that you have the following at the end:

Configuration options:
use debugging code: no
SALOME KERNEL support: yes
SALOME GUI support: yes

make

sudo make install

----------------------------------------------
In case you are getting this error:
omniidl: ERROR!
omniidl: Could not open IDL compiler module _omniidlmodule.so

I realized that indeed _omniidlmodule.so was not present in the folder /home/cyprien/salome/SALOME-9.8.0-native-UB20.04-SRC/INSTALL/omniORB/lib

What I did is that I unzipped the omniORB-4.2.3.tar.gz archive present in /home/cyprien/salome/SALOME-9.8.0-native-UB20.04-SRC/ARCHIVES and then I compiled it using configure - make - make install

After that redo the previous sudo make install for the cfd_module_extension and it should work

-------------------------------------------------

an executable salome_cfd will be created at the location /usr/local/bin/
This is the one that should be used to launch salome_cfd
(not the one located in the bin folder of the salome_cfd_extensions directory)

#Launch Salome CFD
go out of the salome env with "exit"
(If you try to launch salome_cfd from within the Salome env, the CFD study module will not be found)

#In case the CFD study module can't find the code_saturne python module, you have to set the PYTHONPATH variable manually like this:
export PYTHONPATH=/home/cyprien/Code_Saturne/7.0.2/code_saturne-7.0.2/arch/Linux_x86_64/lib/python3.8/site-packages

#Launch Salome CFD

/usr/local/bin/salome_cfd

#This should work now!
#Now configure your bashrc file to load more easily salome CFD

emacs ~/.bashrc

#Paste the following code in it
export PYTHONPATH=/home/cyprien/Code_Saturne/7.0.2/code_saturne-7.0.2/arch/Linux_x86_64/lib/python3.8/site-packages
alias salome_cfd=/usr/local/bin/salome_cfd