
Re: STUDY CASE: isentropic air flow through a convergentdivergent nozzle
Amit Katz Nov 23, 2015 11:54 AM (in response to Beatriz Pozo Arcos)I don't have a ton of experience in compressible flow, so this may come off as an ignorant comment, but I don't see why you should expect the flow in this nozzle to become choked. Your input is 1 ATM of pressure, and your outlet pressure is 88% of the input. I thought that typically you need a pressure ratio of P/P0 <= 0.5 to obtain choked flow through the convergent section of a nozzle like this.

Re: STUDY CASE: isentropic air flow through a convergentdivergent nozzle
Beatriz Pozo Arcos Nov 23, 2015 12:51 PM (in response to Amit Katz)as you can see in equation (9) on the link Isentropic Flow Equations . the mach number you obtain for isentropic flow depends only on the geometry of the nozzle. i have made the calculations for the one i am modeling and it should be 0.88.
anyways, i am more concern about understanding the program. any advice on the boundary conditions ? am i missing something?
