CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

backflow volume fraction

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   December 30, 2012, 01:35
Default backflow volume fraction
  #1
New Member
 
Join Date: Dec 2011
Posts: 29
Rep Power: 5
crispysalt is on a distinguished road
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.
crispysalt is offline   Reply With Quote

Old   December 30, 2012, 02:34
Default
  #2
Senior Member
 
SSL
Join Date: Oct 2012
Posts: 227
Rep Power: 5
msaeedsadeghi is on a distinguished road
Yes. By setting zero, no secondary phase will come into your domain from outlet.
msaeedsadeghi is offline   Reply With Quote

Old   December 30, 2012, 02:54
Default
  #3
New Member
 
Join Date: Dec 2011
Posts: 29
Rep Power: 5
crispysalt is on a distinguished road
Thanks!

It means no secondary phase will go out of the outlet?
crispysalt is offline   Reply With Quote

Old   January 2, 2013, 06:49
Smile
  #4
Member
 
Yanlong Li
Join Date: Jan 2013
Location: BeiJing
Posts: 47
Rep Power: 4
Yanlong Li is on a distinguished road
Quote:
Originally Posted by crispysalt View Post
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.
Yanlong Li is offline   Reply With Quote

Old   January 2, 2013, 09:55
Default
  #5
Senior Member
 
kbaker's Avatar
 
Khalid Baker
Join Date: Mar 2009
Location: IRAQ
Posts: 118
Rep Power: 8
kbaker is on a distinguished road
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 15:04.
kbaker is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
how to set periodic boundary conditions Ganesh FLUENT 13 January 22, 2014 05:11
mesh airfoil NACA0012 anand_30 OpenFOAM Meshing & Mesh Conversion 12 December 12, 2011 05:16
On the damBreak4phaseFine cases paean OpenFOAM Running, Solving & CFD 0 November 14, 2008 22:14
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
Axisymmetrical mesh Rasmus Gjesing (Gjesing) OpenFOAM Native Meshers: blockMesh 10 April 2, 2007 14:00


All times are GMT -4. The time now is 08:14.