CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > Siemens > STAR-CCM+

Outlet BC with Vof?

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 26, 2012, 06:24
Question Outlet BC with Vof?
  #1
New Member
 
Join Date: Mar 2012
Posts: 2
Rep Power: 0
Januel is on a distinguished road
Hello,

Question from a beginner:

I am running an analysis of a buoy with Vof and eulerian multiphase air/sea water. But what is the difference between the "Volum fraction air/sea water" and "Volume fraction Heavy/light fluid" boundary conditions? Manuals from CD-adapco suggest that "Heavy/light" fluid be used for velocity inlet and "air/sea water" for pressure outlet. When I use these settings it does not converge, but using "heavy/light" BC on outlet gives good convergence...

Running with 2DOF, z-translation and y-rotation (the latter rather large; <25 deg pitch-up).

Thanks!
Januel is offline   Reply With Quote

Old   May 28, 2012, 16:29
Default
  #2
Member
 
Join Date: May 2010
Posts: 40
Rep Power: 15
Ladnam is on a distinguished road
Heavy/light is the undisturbed volume fraction. Air/water is the resulting/disturbed volume fraction. So heavy/light should be used for BC.
Ladnam is offline   Reply With Quote

Old   May 28, 2012, 16:48
Default
  #3
New Member
 
Join Date: Mar 2012
Posts: 2
Rep Power: 0
Januel is on a distinguished road
Thanks alot! Been wondering about that one and was unable to find an answer...
Januel is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
UDF Defining VOF Free Surface at Outlet Alex Fluent UDF and Scheme Programming 13 August 8, 2012 17:50
Downstream Pressure outlet BC - FLUENT VOF amwitt FLUENT 2 May 14, 2012 12:46
VOF outlet BC zhi FLUENT 2 April 9, 2008 08:29
VOF Outlet boundary condition in cfd - ace JM Main CFD Forum 0 December 15, 2006 09:07
VOF for flow problems with inlet and outlet Jannifer FLUENT 11 April 6, 2006 15:56


All times are GMT -4. The time now is 04:37.