## 7.16. Boundary Conditions in Multiphase Flow

The use of boundary conditions for multiphase flow is very similar to that for single-phase flow. For details, see Boundary Condition Modeling. The main differences are:

- Boundary conditions need to be specified for all fluids for all variables except the shared pressure field.

- Volume fractions of all phases must be specified on inlet and opening boundary conditions. These must sum to unity.

- A degassing boundary condition is available for multiphase flow containing a dispersed phase. For details, see Degassing Condition (Multiphase only).

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