Set inlet velocity and pressure in cavitational model

GerardX89 · June 27, 2012, 09:45

Hello people,

I want to set the BCs in my venturi tunnel set with a cavitational model.
my intial condition are:
V= 18 m/s
P0 = 39700 Pa

When I set the cavitational model I have to put at 0 the operating pressure so I cannot modify it.

I tried to use the pressure inlet.
I assumed that the:
gauge total pressure = total pressure
the supersonic/initial gauge pressure = static pressure

so using this formula: p_0 = p_s + 1/2 ro*v^2
p_0= total pressure
p_s= static pressure
v=velocity
ro=density

I should find my static pressure and put those values in the inlet right?
But unfortunally in postprocessing I don't have in the inlet the velocity that I want or better that I thought I imposed.

Please help me

Best
Gerardo

GerardX89 · July 5, 2012, 16:17

Sorry for the delay and thanks for your help.
here is the case and data file:
https://dl.dropbox.com/u/8252311/Sez_gola_Press.zip

Ps: I just noticed that even if I change the supersonic/initial gauge pressure
the result doesn't change it's like fluent is not considering it.

June 27, 2012, 09:45	Set inlet velocity and pressure in cavitational model	#1
GerardX89 New Member Gerardo Join Date: Apr 2012 Location: Trento Italy Posts: 5 Rep Power: 14	Hello people, I want to set the BCs in my venturi tunnel set with a cavitational model. my intial condition are: V= 18 m/s P0 = 39700 Pa When I set the cavitational model I have to put at 0 the operating pressure so I cannot modify it. I tried to use the pressure inlet. I assumed that the: gauge total pressure = total pressure the supersonic/initial gauge pressure = static pressure so using this formula: p_0 = p_s + 1/2 ro*v^2 p_0= total pressure p_s= static pressure v=velocity ro=density I should find my static pressure and put those values in the inlet right? But unfortunally in postprocessing I don't have in the inlet the velocity that I want or better that I thought I imposed. Please help me Best Gerardo

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July 5, 2012, 16:17		#2
GerardX89 New Member Gerardo Join Date: Apr 2012 Location: Trento Italy Posts: 5 Rep Power: 14	Sorry for the delay and thanks for your help. here is the case and data file: https://dl.dropbox.com/u/8252311/Sez_gola_Press.zip Ps: I just noticed that even if I change the supersonic/initial gauge pressure the result doesn't change it's like fluent is not considering it.