Nikhil Narale
Ansys Employee

In VOF, for two phase flows, an additional transport equation is solved for the VF of the secondary phase. For primary phase, volume fraction is simply calculated by: VF = 1 - VF of secondary phase. For more details, please check this section of the theory guide: 14.3.4. Volume Fraction Equation (ansys.com)

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Thanks! 

Nikhil