[chanfire]

I am trying to simulate the fueling process of gas cylinder using CFX.
My concern is the pressure rising during the filling of gas into the closed vessel. So, the computational domain is very simple, consist of a pressure boundary condition as inlet and walls without any outlet.

After CFX-pre, I have an error in a few iterations(3 iterations), and the solving has been stopped.
Do I need any technique to model the compress flow in a closed vessel ?
I already got some results with FLUENT model considering operating pressure option. But I can not find such option in CFX model.

the error message was as follows:
"The ANSYS CFX solver could not be started, or exited with return code 255:", ". No results file has been created."

Thanks in advance.