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pranav22 May 13, 2006 16:46

Bubble Dynamics & VOF
Hi fluent experts,

Is it possible to incorparate bubble dynamics behavior using VOF model?

I am trying with the venturi model & introducing spherical bubbles at inlet.please share your suggestions to me.

Any help would be very much appreciated.

regards, Pranav

mIn May 13, 2006 17:50

Re: Bubble Dynamics & VOF
yes, dynamics of bubble motion can be captured using the VOF model. What is this venturi model?

pranav22 May 14, 2006 10:15

Re: Bubble Dynamics & VOF
Hi mln,

My computational domain is venturi. I am injecting a spherical air bubble at the inlet of geometry. Primary Phase of my analysis is water.The main aim of this study is to predict the variation in temperature of the bubble while travelling in different cross section of venturi.

Is it possible to enable Energy Eqn and make secondary phase is compressible?. If so, where can i get the variable property of air with respect to pressure & temperature?

Any help is highly appreciated


Pete May 14, 2006 10:30

Re: Bubble Dynamics & VOF
You can define a mixture phase and use species transport. I think Fluent will allow for at least one compressible phase. Check the manual.

mateus May 15, 2006 03:34

Re: Bubble Dynamics & VOF

I think that what you try to do is wery interesting but also very hard. There was a paper of cfd simulation including thermal effects at the CAV2003 conference (just write cav2003 in google - you´ll find a link to the papers there). But there they used a different approach of modelling - the barotropic cavitation model. You´ll probably also not get far with vof and bubble dynamics (reyleigh plesset equation) because you´d need a very dense mesh for that - cell size 1/10 of the bubble size...that´s approximatelly 10^-5m (or even less in the beginning and end stage of bubble evolution).

I hope I helped a bit...

If you have any questions about cavitation modeling i am heppy to help, just write me an email - i did a lot of work in this area (but none considering thermal effects.

By mateus

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