Code Saturne - Compressible Flow

Dear CAE Linux Users,
Does anyone have an example where they have successfully used the compressible flow capability in Code Saturne. I would like to model the flow through a valve body with compressible flow. I understand that this is not possible through the GUI.

In the manual it says to "place the user subroutines in the FORT directory ( is this the FORT or the /FORT/USERS ?) I tried to transfer the files as stated on p16 of the manual, but I am kind of lost as to how to perform the next steps. Do I need to modify any of the files such as the XML, the 'lance' or the batch ? If so - where ?

I need to know how to run Saturne in batch mode, as I have only ever run through the GUI.

Thanks
Robin