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continuity equation for the mixture

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Old   May 2, 2003, 03:59
Default continuity equation for the mixture
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mateus
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Hi!

I posted this message some time ago on fluent forum but ive got no responce. So ill try my luck here...

Im dealind with cavitation problem with so called mixture model. Its very simmilar to VOf model. Anyway the problem is with continuity equation with the mixture.

d/dt(rho_m)+nabla(rho_m*v_m)=mass transfer

Its equation 20.3.1 in fluent manual. index m means mixture (all the parameters of each phase - like velocity and density are averaged to a single mixture phase).The question is how can there be mass transfer between phases inluded in this equation if its averaged for the mixture????

The other equation is volume fraction equation for secondary phase (20.3.15) To get the void fraction of each phase in a cell fluent solves this equation:

d/dt(alpha_k*rho_k)+nabla(alpha_k*rho_k*v_k)=0

where alpha_k is the volume fraction of k-th phase. - shouldnt mass transfer be included here????

please help

regards MATEUS

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