CFX boundary conditions setting

Aladinos05 · March 5, 2018, 07:17

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, 13:57

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, 07:17	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 !

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Centrifugal fan	j0hnny	CFX	13	October 1, 2019 13:55
Out File does not show Imbalance in %	Mmaragann	CFX	5	January 20, 2017 10:20
Error - Solar absorber - Solar Thermal Radiation	MichaelK	CFX	12	September 1, 2016 05:15
Problem in setting Boundary Condition	Madhatter92	CFX	12	January 12, 2016 04:39
symmetry boundary conditions in cfx	lost.identity	CFX	41	May 22, 2013 07:21

March 5, 2018, 13:57		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,854 Rep Power: 27	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. :-)