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

liquid decreases in bubble column E-E simulation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 24, 2010, 22:19
Default liquid decreases in bubble column E-E simulation
  #1
New Member
 
Join Date: Sep 2009
Posts: 1
Rep Power: 0
jhchen is on a distinguished road
Hi, I have a problem in bubble column simulation. the column is 0.1 m in diameter and 2m in height. Initially quiescent water is filled at the lower half. the gas is introduced at the bottom. The top surface is set as pressure outlet. k-eps model(mixture version) and QUICK scheme is used.
Question is: at heigher Ug(>0.1 m/s), the liquid will decrease dramatically, but not because entrainment since I have monitored the flux on outlet.
I guess some convegence problem causes this problem. Possibly the gas cap above the liquid bulk region, the backflow settings about the pressure outlet BC may be potential sticking points.

would u help me? Welcome constructive discussions.

ps: I know the degassing BC and it seems not practical for the simulation with gas cap. I have also extend the simulation domain but it doesn't help.
jhchen is offline   Reply With Quote

Old   August 3, 2010, 10:49
Default
  #2
New Member
 
Simon Hans's Avatar
 
Simon Hans Niemann
Join Date: Mar 2009
Location: Geleen, Netherlands
Posts: 2
Rep Power: 0
Simon Hans is on a distinguished road
Did you set a minumum vf for the liquid phase? In that case your mass balance will not be satisfgied in regeions where vf_liq should go to zero
Simon Hans is offline   Reply With Quote

Reply

Tags
bubble column, e-e, gas cap, gas-liquid

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
Turbulent boundary conditions for bubble column anjai FLUENT 12 October 17, 2005 06:34
simulation of taylor bubble merrouche djemai Main CFD Forum 0 December 18, 2002 05:34
compressible liquid simulation kaiser Main CFD Forum 0 October 13, 2002 04:32
Simulation of bubble growth Jean van der Merwe Main CFD Forum 3 May 1, 2001 19:40
Gas Bubbling through Liquid Column marakib FLUENT 0 March 18, 2001 09:19


All times are GMT -4. The time now is 00:09.