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-   -   two energy equations in Fluent (http://www.cfd-online.com/Forums/fluent-udf/76170-two-energy-equations-fluent.html)

louiza May 17, 2010 05:53

two energy equations in Fluent
 
Hi

I try to modeled arc burning discharge, and i didn't know how to introduce two temperature or energy equation, one for electrons and for heavey species in Fluent.
if you have any suggestion answer me.
Thant's
louiza

dmoroian May 17, 2010 06:47

I don't know how you intend to model this phenomenon, but , as far as I know in fluent, you can add scalar transport equations and species transport equations, not extra energy equations.

louiza May 17, 2010 08:33

1 Attachment(s)
Quote:

Originally Posted by dmoroian (Post 259065)
I don't know how you intend to model this phenomenon, but , as far as I know in fluent, you can add scalar transport equations and species transport equations, not extra energy equations.

thank you dmoroian for your note and the reply, infact I modeled the arc in LTE (with a single temperature : local temperatureequilibrium ) where I add a single source term for energy equation in the form of a UDM

my question is: in the case when i suppose two different temperatures for a species and another for heavy electrons (no LTE), how to define two equations of energy in Fluent
see equation 1 and 2

dmoroian May 17, 2010 14:11

Your equations contain mixed derivatives, and I'm not sure how to implement those. But, as I said before, you have to use either scalar transport equations or species transport equations. I'm not aware of any way to implement extra energy equations, maybe for multiphase flows with euler-euler approach... but is a long shot.

louiza May 18, 2010 03:29

Quote:

Originally Posted by dmoroian (Post 259139)
Your equations contain mixed derivatives, and I'm not sure how to implement those. But, as I said before, you have to use either scalar transport equations or species transport equations. I'm not aware of any way to implement extra energy equations, maybe for multiphase flows with euler-euler approach... but is a long shot.


Thank you very much Dmoroian for your answer and suggestion.


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