CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

under what circumstances would interFoam have alpha > 1?

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

Like Tree1Likes
  • 1 Post By duongquaphim

Reply
 
LinkBack Thread Tools Display Modes
Old   February 21, 2013, 16:04
Default under what circumstances would interFoam have alpha > 1?
  #1
New Member
 
Yanxiang Shi
Join Date: Mar 2012
Location: Cambridge, MA, US
Posts: 29
Rep Power: 5
yanxiang is on a distinguished road
Dear Foamers,

As per the title, in OF211, what would make the alpha go above 1 when using interFoam? Shouldn't the MULES solver ensure the volume fraction be bounded at all times?

I constantly get unbounded alpha when trying to simulating a microscale reactor with good quality mesh. Sometimes it could go up to 6 or even higher if allowed to run longer. I partially solved the problem by changing the mesh/BC. However, it is good to know what causes this issue.

Thanks,
Yanxiang
yanxiang is offline   Reply With Quote

Old   July 15, 2013, 16:29
Default
  #2
Member
 
Duong A. Hoang
Join Date: Apr 2009
Location: Delft, Netherlands
Posts: 92
Rep Power: 8
duongquaphim is on a distinguished road
Send a message via Yahoo to duongquaphim
Are you running cases with the same settings as in the damBreak tutorial? Could you put the case here such that I can give it a try? I never had any things like that.

Also for the term div(phi,alpha), using vanLeer01 instead of vanLeer might be helpful. This might also be helpful http://www.cfd-online.com/Forums/ope...erdymfoam.html

Regards,

Duong
vbnhfylbh likes this.
duongquaphim 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
InterFoam negative alpha karasa03 OpenFOAM 7 December 12, 2013 04:41
alphaEqn.H in twoPhaseEulerFoam cheng1988sjtu OpenFOAM Bugs 14 September 18, 2011 13:46
alpha becomes bigger than 1 in interFoam ata OpenFOAM 0 February 27, 2011 06:09
Moving from simpleFoam to interFoam with alpha = 0 kjetil OpenFOAM Running, Solving & CFD 1 November 8, 2009 21:04
alpha or alpha1 in interFoam & interDyMFoam wavytracy OpenFOAM Bugs 3 September 10, 2009 02:51


All times are GMT -4. The time now is 04:39.