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23.10.4 Setting Time-Dependent Parameters for the VOF Model

If you are using the time-dependent VOF formulation in FLUENT, an explicit solution for the volume fraction is obtained either once each time step or once each iteration, depending upon your inputs to the model. You also have control over the time step used for the volume fraction calculation.

To compute a time-dependent VOF solution, you will need to enable the Unsteady option in the Solver panel (and choose the appropriate Unsteady Formulation, as discussed in Section  25.17.1). If you choose the Explicit scheme, FLUENT will turn on the first-order unsteady formulation for you automatically, so you need not visit the Solver panel yourself.

Define $\rightarrow$ Models $\rightarrow$ Solver...

There are two inputs for the time-dependent calculation for the VOF model:

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