Hi,

I have simulated compressible flow in a CD nozzle. If I set Total Guage Pressure = 10.84 atm and operating pressure = 1atm, what would be the Absolute Pressure? As far I know,

Abs Pressure = Gauge Pressure + Operating Pressure.

So, Absolute Pressure should be 11.84 atm. But Fluent is showing Abs Pressure = 10.48 atm at inlet. What is the reason?

What is the Initial guage pressure for pressure inlet? I have set this value 9.7 atm so that I can get 124 m/s velocity that will give expected Mach number at Inlet. Am I right?

What is the difference between Total Pressure and Absolute pressure?

Thanks,

Raju.