# pressure inlet

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 September 26, 2013, 11:15 pressure inlet #1 Member   Sa.Baraty Join Date: Apr 2013 Location: Iran Posts: 50 Rep Power: 6 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 Member   Daniel Oliden Join Date: May 2012 Location: Arizona Posts: 36 Rep Power: 7 "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 Member   Sa.Baraty Join Date: Apr 2013 Location: Iran Posts: 50 Rep Power: 6 thanks a lot How i compute this items? __________________ thanks

 September 27, 2013, 04:37 #4 Member   Daniel Oliden Join Date: May 2012 Location: Arizona Posts: 36 Rep Power: 7 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

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