Thanks for replying.nI set the density to ideal-gas, not ideal-gas-incompressible. I hope this is correct.nFLUENT gives me a warning saying 'For compressible (ideal and real) gas models with buoyancy, it is recommended that you use a specified operating density value of zero:' . I'm assuming I don't have to pay heed to this as it's not buoyancy driven.nAlso, I'm running with these settings for operating pressure. I hope they're OK. nI'm running this on a CPU only solver, so want to make sure of the settings as it takes a lot of time. Also, I've set up another monitor on flow rate, so I can stop the simulation once it flattens right?n