Theory question about suction pressure of a pump and CFX Simulation

iloc86 · July 11, 2015, 21:30

Hi guys, im in a research project about artificial lift systems for oil wells. we are discusing about put a pump in surface and its capacity to lift the oil. As all we know, in atmosferic conditions, if we have a vertical pipe that in the bottom we have a tank of water and in the end we have a pump, the maximum heigh that we going to lift is nearly 10.3 m cuz is what 14 psi of the atmosphere pressure can lift if we get near to zero pressure at the outlet.

I did in cfx a 20m vertical pipe, where in the inlet (bottom) have 1 atm and in the outlet have 1 atm, and i did a subdomain with general momentum source to v=1 m/s, that simulate the pump near the end of the pipe. i got convergence and i found that it flows, i was waiting no convergence cuz in realit it can flow with that conditions. Whats going on??

ghorrocks · July 12, 2015, 07:11

Please post some images of what you are modelling, your mesh and your CCL.

iloc86 · July 13, 2015, 11:45

i hope it could help

ghorrocks · July 13, 2015, 19:56

You have not included your mesh or CCL. I do not know what the images mean without it.

Steffen595 · July 16, 2015, 19:21

put an expression in for AreaAve(Pressure)@outlet
or better still outlet - inlet? Or both, see, what they are up to

July 11, 2015, 21:30	Theory question about suction pressure of a pump and CFX Simulation	#1
iloc86 New Member ivan Join Date: Dec 2014 Posts: 14 Rep Power: 11	Hi guys, im in a research project about artificial lift systems for oil wells. we are discusing about put a pump in surface and its capacity to lift the oil. As all we know, in atmosferic conditions, if we have a vertical pipe that in the bottom we have a tank of water and in the end we have a pump, the maximum heigh that we going to lift is nearly 10.3 m cuz is what 14 psi of the atmosphere pressure can lift if we get near to zero pressure at the outlet. I did in cfx a 20m vertical pipe, where in the inlet (bottom) have 1 atm and in the outlet have 1 atm, and i did a subdomain with general momentum source to v=1 m/s, that simulate the pump near the end of the pipe. i got convergence and i found that it flows, i was waiting no convergence cuz in realit it can flow with that conditions. Whats going on??

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July 12, 2015, 07:11		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Please post some images of what you are modelling, your mesh and your CCL.

July 13, 2015, 19:56		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	You have not included your mesh or CCL. I do not know what the images mean without it.

July 16, 2015, 19:21		#5
Steffen595 Senior Member Join Date: May 2012 Location: Melbourne Posts: 161 Rep Power: 14	put an expression in for AreaAve(Pressure)@outlet or better still outlet - inlet? Or both, see, what they are up to