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-   -   backflow volume fraction (http://www.cfd-online.com/Forums/fluent/111165-backflow-volume-fraction.html)

crispysalt December 30, 2012 00:35

backflow volume fraction
 
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 (Post 399431)
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.


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