CFD Online Logo CFD Online URL
Home > Forums > FLUENT

mixture model

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

LinkBack Thread Tools Display Modes
Old   June 10, 2008, 02:14
Default mixture model
khar nab
Posts: n/a
hello I want to know what is the threshold value of the dispersed phase volume fraction for which the mixture model remains applicable. My mixture is gas bubbles dispersed in water. The gas becomes a continuous phase in some regions of the domain. The inlet volume fraction can vary from less than 5% to more than 70%. Thanks.
  Reply With Quote

Old   June 10, 2008, 09:43
Default Re: mixture model
Posts: n/a
i'm doing a similiar work where the dispersed phase is water. in your case, you should faced to numerical stability matters. i found that the default drag law in fluent is not the best one for our kind of flow. i advise you to choose a symmetric drag law(define->phases->interactions). in fluent documentation, you can read why this law is appropriated. however, the system doesn't became convergent if the volume fraction is to high. in this case, you should reduce under-relaxation number of volume fraction. but, do not reduce is drasticly, because fluent doesn't calculate if it's to small. ( divide the number by 10, it should be suffisant).

i wish i helped you. send me an email, if you want more details.
  Reply With Quote

Old   January 24, 2011, 02:06
New Member
Join Date: Jan 2011
Posts: 29
Rep Power: 6
sandisk is on a distinguished road
I am also working on mixture model for slurry flow simulation,( water and sand ( 0-5% vf)). I am not able to get simulations converge correctly. I am new to Fluent.Can you assist me in my case ?
Thanks in advance .
sandisk is offline   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
mixture model am.ya. FLUENT 0 March 3, 2007 01:46
mixture model JackJass FLUENT 0 February 25, 2007 04:37
Mixture model James FLUENT 0 February 7, 2007 06:34
Mixture Model mahmood FLUENT 0 June 15, 2006 05:35
About mixture model fpingqian FLUENT 2 June 7, 2005 07:42

All times are GMT -4. The time now is 23:55.