[Ronnie-Du]

I was eager to know why the vf-phase-2 (the phase to which mass was transfered) residual turned to a high level (above 1) when the mass transfer occured from the phase-1 to the phase-2 (you could see it from the attached fig). I have also tried to reduced the under-relaxation factors, but it just works a little. I am looking forward your great reply soon. thank you so much much much.

[Ahmed Alkaisi]

Can you describe the problem first
Why Do You Use Eulieran Model
Where Is The VOF P1
And you do you use 2D
Anyway try less time step 1e-8
And URF 0.1-0.5 maximum

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[Ronnie-Du]

Quite good Suggestion! I have tried reducing the time step to 1e-2 at the first 5s. Because my case is a quasi-unsteady mass transfer process (2D-modeling) within several hours, so it is not expected to utilize an extrem time step during the whole process. I really aprreciate your reply.

[Ahmed Alkaisi]

Also try PISO solution method and hybrid intialization

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