backflow volume fraction in pressure outlet

haghshenasfard · January 23, 2018, 05:11

in multiphase modeling, the backflow volume fraction should be defined at the pressure outlet, Is it right that the value being set as "1" means the second phase total reflux?
what about the value being set as "0.5"?
What should we do if we want exit of one of species in outlet?

CeesH · March 5, 2018, 11:10

You should set it to what is the most realistic for your problem. If you have, say, a column with a gas-filled headspace, then backflow should be 100% gas, Just regard it as an additional inlet - in case the flow would be inward here, what would be flowing back in?

January 23, 2018, 05:11	backflow volume fraction in pressure outlet	#1
haghshenasfard New Member a Join Date: Feb 2010 Posts: 14 Rep Power: 16	in multiphase modeling, the backflow volume fraction should be defined at the pressure outlet, Is it right that the value being set as "1" means the second phase total reflux? what about the value being set as "0.5"? What should we do if we want exit of one of species in outlet?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Generating water waves - backflow at the outlet	Luke92	CFX	1	November 18, 2017 06:27
Free surface issues with interDyMFoam for hydroturbine	oumnion	OpenFOAM Running, Solving & CFD	0	October 6, 2017 15:05
Wrong flow in ratating domain problem	Sanyo	CFX	17	August 15, 2015 07:20
Finding Volume fraction at outlet when it changes its phase.	praveen.jpk	Main CFD Forum	1	August 18, 2014 08:18
Backflow occuring at a pressure outlet?	Dave	FLUENT	1	August 12, 2004 18:39

March 5, 2018, 11:10		#2
CeesH Senior Member Cees Haringa Join Date: May 2013 Location: Delft Posts: 607 Rep Power: 0	You should set it to what is the most realistic for your problem. If you have, say, a column with a gas-filled headspace, then backflow should be 100% gas, Just regard it as an additional inlet - in case the flow would be inward here, what would be flowing back in?