How Fluent calculate the shared velocity at the interface using VOF method

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  • Last Post 19 February 2020
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Billyyee posted this 18 February 2020

As the theory manual, "A single momentum equation is solved throughout the domain, and the resulting velocity field is shared among the phase. So how Fluent calculates the velocity at the interface? Thanks 

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kkanade posted this 18 February 2020

Based on the local value of α_q, the appropriate properties and variables are assigned to each control volume within the domain

kkanade posted this 18 February 2020

if this help you, please mark this post as 'Is Solution' to help others. 

abenhadj posted this 18 February 2020

There is only one single velocity field. As kknade highlighted all other properties like density, viscosity are phase averaged. Fluent does a sort of mass weighted average here to get the bulk velocity. 

 

Just add the equations from Eulerian Model together and you will get the ones for Mixture and VOF model. This is not Fluent only this is also Test Book and all Multiphase References.

Please mark this as Is solved.

Best regards, Amine

Billyyee posted this 18 February 2020

Hi,

Thanks for your reply. You mean V at the interface is obtained by

 

V_interface = Σ α_q . v_q?  Correct?

Billyyee posted this 18 February 2020

Hi,

Thanks for your reply. You mean V at the interface is obtained by

 

V_interface = Σ α_q . v_q?  Correct?

abenhadj posted this 19 February 2020

With density to weight and divide by bulk density

Best regards, Amine

Billyyee posted this 19 February 2020

Thanks.

 

Bill

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