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[98546948]

Hello everyone,

      I'm struggling with a question about mass source term in multiphase flow during consulting the Fluent Help. There are some describes like these:

So,my question is ,for the VOF model, primary phase is one phase of p or q, whether the eqution above is established?

Thank you!

[Keyur Kanade]

Hi, 

Its when you have both models on ie vof and species. 

If you have only vof then eliminate species in the above description.  In case a particular phase does not have a mixture material associated with it, the mass transfer will be with the bulk phase.

Regards,

Keyur

[Keyur Kanade]

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[98546948]

Thanks for your reply, what's the meaning of "the mass transfer will be with the bulk phase"? Could the bulk phase  be ragard as the primary phase in single VOF model?

Regards

[DrAmine]

It does not depend on the primary or secondary phases as described in the documentation. mptoq is the mass transfer from p phase to q phase. This direction is positive.

[98546948]

Hello Amine, thanks for your explanation. By the way, how does the VOF method guarantee mass conservation?

Regards

[DrAmine]

Through the solution of the transport equations of the secondary phases and the compatibility condition

[98546948]

Excuse me, I can't understand the meaning of conpatibility condition. Please provide more details. Thank you.

Best wishes

[DrAmine]

Sum of all volume fractions needs to be equal to one

[98546948]

Thank you.