backflow volume fraction

crispysalt · December 30, 2012, 00:35

Hi,

I am using pressure outlet boundary condition with multiphase flow. Can the backflow volume fraction be used to restrict the secondary phase from leaving the system at a pressure outlet?

Thanks.

msaeedsadeghi · December 30, 2012, 01:34

Yes. By setting zero, no secondary phase will come into your domain from outlet.

crispysalt · December 30, 2012, 01:54

Thanks!

It means no secondary phase will go out of the outlet?

Yanlong Li · January 2, 2013, 05:49

Quote:

Originally Posted by crispysalt

Thanks!

It means no secondary phase will go out of the outlet?

Actually, you can set your outlet face type as wall, and open a near face that the secondary phase can not reach as pressure outlet. hope it can help.

kbaker · January 2, 2013, 08:55

By settings vof value at pressure outlet as zero (default value of vof) then fluent will estimate the backflow volume fraction for the secondary phase from the downstream flow depending on your inlet conditions.

December 30, 2012, 00:35	backflow volume fraction	#1
crispysalt New Member Join Date: Dec 2011 Posts: 29 Rep Power: 14	Hi, I am using pressure outlet boundary condition with multiphase flow. Can the backflow volume fraction be used to restrict the secondary phase from leaving the system at a pressure outlet? Thanks.

January 2, 2013, 08:55		#5
kbaker Senior Member Khalid Baker Join Date: Mar 2009 Location: IRAQ Posts: 168 Rep Power: 17	By settings vof value at pressure outlet as zero (default value of vof) then fluent will estimate the backflow volume fraction for the secondary phase from the downstream flow depending on your inlet conditions. Last edited by kbaker; January 2, 2013 at 14:04.

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December 30, 2012, 01:34		#2
msaeedsadeghi Senior Member SSL Join Date: Oct 2012 Posts: 226 Rep Power: 14	Yes. By setting zero, no secondary phase will come into your domain from outlet.

December 30, 2012, 01:54		#3
crispysalt New Member Join Date: Dec 2011 Posts: 29 Rep Power: 14	Thanks! It means no secondary phase will go out of the outlet?