CFX boundary conditions setting

Aladinos05 · March 5, 2018, 08:17

Hello !

I wanted to know about how i can know the exact value of Static Pressure at the outlet of a Pump turbine to meet a certain experimentally found Head value. I have already set the inlet Boundary conditions to mass flow in.

Thank you !

Gert-Jan · March 5, 2018, 14:57

Heat at the oulet = Total Pressure = Pstatic + rho/2*v^2
Since you know the massflow, you should be able to calculate the average velocity at the outlet. From that, you can calculate Pstatic, not?
The accuracy depends on the velocity uniformity at the oulet. You should determine that using CFD. It it not very uniform, then you might be a bit off.

But then that is something to optimize. :-)

March 5, 2018, 08:17	CFX boundary conditions setting	#1
Aladinos05 New Member Binama Maxime Join Date: Mar 2015 Location: Harbin-China Posts: 9 Rep Power: 11	Hello ! I wanted to know about how i can know the exact value of Static Pressure at the outlet of a Pump turbine to meet a certain experimentally found Head value. I have already set the inlet Boundary conditions to mass flow in. Thank you !

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March 5, 2018, 14:57		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	Heat at the oulet = Total Pressure = Pstatic + rho/2*v^2 Since you know the massflow, you should be able to calculate the average velocity at the outlet. From that, you can calculate Pstatic, not? The accuracy depends on the velocity uniformity at the oulet. You should determine that using CFD. It it not very uniform, then you might be a bit off. But then that is something to optimize. :-)