Taking a 500+ psi drop across and orifice and trying to perform a harmonic - fatigue analysis of piping downstream.

Fluid is nitrogen gas and the orifice is assumed choked. Applying the "Harmonic Frequencies" of between 0.2 V/D and 0.3 V/D produces obvious high frequencies (1500 - 2500 Hz).

Applying the phase formula for the high frequency, relatively short pipe length results in a phase number that doesn't make sense (a number greater than 360).

I guess my basic question is, "Is this type of application something that Caesar II is capable of performing?".