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-   -   Cavitation in venturi (http://www.cfd-online.com/Forums/fluent/40947-cavitation-venturi.html)

pranav May 12, 2006 05:08

Cavitation in venturi
 
Hi

I am working on venturi cavitation by using fluent. Does anybody know how to get the temperature at collapse phase of Cavitation?

Thanks

CFDtoy May 13, 2006 12:51

Re: Cavitation in venturi
 
Hi Pranav: In reality, the temperature increase incase of venturi cav is that not high. Thts why people decouple energy eqn, If you want to solve for temp.

Include, Energy Eqn and make vapor phase compressible. You will get what you want :)

CFDtoy !

pranav May 13, 2006 15:59

Re: Cavitation in venturi
 
Hi CFDtoy,

Thank you for your response.

I am interested on vapour phase temperature & pressure not for mixtures. In reality, the temperature & pressure rise is more in vapour phase while collapsing stage of cavitation bubbles.

Please share with me, If you have any other ideas.

Pranav


Donald May 14, 2006 11:45

Re: Cavitation in venturi
 
It is not possible to do this in fluent without a correct equation of state. You need gas E.O.S. more adanced than ideal gas.

D.

mateus May 15, 2006 01:19

Re: Cavitation in venturi
 
Hi!

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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