pressure inlet

sara22 · September 26, 2013, 11:15

Hello.
I want to use 'Pressure inlet' boundary condition so i must understand two parameter such as 'Gauge total pressure' & ' Supper sonic / initial gauge pressure'
in my model the inlet pressure is (Pi=1050 psi).
please help me to adjust two parameter : 1-Gauge total pressure
2-Supper sonic / initial gauge pressure
Be mentioned that in my model maximum velocity is 20 m/s

Panboy · September 26, 2013, 17:29

"Gauge Total Pressure" is the total pressure of your fluid.
"Supersonic/Initial Gauge Pressure" is the static pressure of your fluid.

With pressure inlet, you do not enter velocity. It is computed from either Bernoulli's equation for noncompressible flow, or isentropic relations for compressible flow.
However, you can verify that the velocity is correct by going to the reference tab and selecting the inlet boundary and see what the velocity is displaying.

Panboy

sara22 · September 27, 2013, 04:07

thanks a lot
How i compute this items?

Panboy · September 27, 2013, 04:37

what values do you have for inputs?

I am assuming the 1050 psi is static pressure?
You are going to have to find total pressure somehow.

Total pressure = P_static + P_dynamic

the dynamic pressure for incompressible flow is (1/2)rho*v^2.

Also, this is most likely subsonic, right? Unless the temperature is extremely low. You also need to input temperature

September 26, 2013, 11:15	pressure inlet	#1
sara22 Member Sa.Baraty Join Date: Apr 2013 Location: Iran Posts: 50 Rep Power: 13	Hello. I want to use 'Pressure inlet' boundary condition so i must understand two parameter such as 'Gauge total pressure' & ' Supper sonic / initial gauge pressure' in my model the inlet pressure is (Pi=1050 psi). please help me to adjust two parameter : 1-Gauge total pressure 2-Supper sonic / initial gauge pressure Be mentioned that in my model maximum velocity is 20 m/s __________________ thanks

September 26, 2013, 17:29	pressure inlet	#2
Panboy Member Daniel Oliden Join Date: May 2012 Location: Arizona Posts: 36 Rep Power: 13	"Gauge Total Pressure" is the total pressure of your fluid. "Supersonic/Initial Gauge Pressure" is the static pressure of your fluid. With pressure inlet, you do not enter velocity. It is computed from either Bernoulli's equation for noncompressible flow, or isentropic relations for compressible flow. However, you can verify that the velocity is correct by going to the reference tab and selecting the inlet boundary and see what the velocity is displaying. Panboy

September 27, 2013, 04:07		#3
sara22 Member Sa.Baraty Join Date: Apr 2013 Location: Iran Posts: 50 Rep Power: 13	thanks a lot How i compute this items? __________________ thanks

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September 27, 2013, 04:37		#4
Panboy Member Daniel Oliden Join Date: May 2012 Location: Arizona Posts: 36 Rep Power: 13	what values do you have for inputs? I am assuming the 1050 psi is static pressure? You are going to have to find total pressure somehow. Total pressure = P_static + P_dynamic the dynamic pressure for incompressible flow is (1/2)rho*v^2. Also, this is most likely subsonic, right? Unless the temperature is extremely low. You also need to input temperature