CFD Online Logo CFD Online URL
Home > Forums > FLUENT

liquid-gas free surface and VOF

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

LinkBack Thread Tools Display Modes
Old   February 16, 2009, 07:22
Default liquid-gas free surface and VOF
Posts: n/a
Hi all,

I want to simulate a box filled water and air motion above it in 2d. left wall of the box is hot, right wall is cold. I wolud like to investigate streamlines, isotherms and heat transfer coefficient in different air temperatures and different aspect ration.

But, I have no idea, how can i model in gambit. image of model is above.

right, left and bootom walls of box are ok. but, for other walls, i have been try alot of BC but, nothing nothing nothing.

can you say, how can I draw the problem in gambit, how can I define phases and free surface. which model is nessesery in fluent. can I use "open channel flow" model.

please help me.

thanks in advance
  Reply With Quote

Old   February 18, 2009, 20:13
Default Re: liquid-gas free surface and VOF
Posts: n/a
please help!!!
  Reply With Quote

Old   February 19, 2009, 02:49
Default Re: liquid-gas free surface and VOF
Ameya Durve
Posts: n/a
Even i am simulating box filled with water and motion of the air above and conditions required for entrapment of air in water.

What i do is I simply draw a rectangular face in gambit and export a 2d mesh. BC's are simply "walls " and "fluid". I define phases in fluent. interface is created by patching appropriate volume fractions of water and air. (The patching has to be done in fluent). Hot and cold walls can be deifined by changing wall BC in fluent.

To be frank I don't see the problem to be that critical. May be if you can be more specific as to where you are stuck, I can try to help you in a better way.

Regards Ameya
  Reply With Quote

Old   February 19, 2009, 17:19
Default Re: liquid-gas free surface and VOF
Posts: n/a
thanks. i draw a rectangular face and define phases in gambit. in fluent, initalize and patch are done. after iteration, solution converged. this is good. but, I have to use boussinesq approximation for water and air. I think, boussinesq aproximation can use for only a phase in vof model. what can I do for this problem??

  Reply With Quote


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
free-surface liquid filling a fuel tank lee CFX 2 June 4, 2008 21:01
add Marangoni Stress for a free liquid surface wanghong FLUENT 1 November 29, 2004 04:26
free RANS code with free surface ability Lou jing Main CFD Forum 1 July 11, 2003 14:43
[surface tension effect at free-surface ?] name Main CFD Forum 1 September 21, 2001 09:54
free convection heat transfer from a heated horizontal surface through a liquid to a thin cooled fin Kaushik FLUENT 1 May 8, 2000 06:47

All times are GMT -4. The time now is 17:00.