Regarding parallel run

[anuragray20]

I hope you are doing well in life. I have recently come across this code, and it has very positive prospects; however, I have a query regarding this code. I want to use this code in parallel mode to speed up the calculations. I compiled the code using the mpicc flag (compiler). The code has been successfully compiled using the Intel compiler without warnings. By looking at the help guide, I see the command to run the code in parallel mode is:
./artracfd -m mpi -n nxnynz
Am I correct? If I want to fire the job in parallel mode, do I have to do something else, e.g., decompose the domain into subdomains, etc., or change inputs in the artracfd.case file? I am awaiting your reply.
Thanks, and regards!