721 Volume of Fluid VOF Approach

In the VOF approach, the present phases share a single set of conservation equations as discussed in Chapter 4. The essential feature of the VOF model is that it simulates the motion of a fluid-fluid interface embedded in the overall motion. It is important to maintain a compact interface thickness (one computational cell thick) to realize accurate simulations. VOF methods employ a marker function F(x,t) (or a volume fraction) that uniquely identifies the fluid under consideration. A unit value for F indicates a cell completely filled with one phase, whereas a zero value indicates a cell containing only the other phase. Therefore, computational

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