Page 126 - ansys

4. (Eulerian model only) If the flow is turbulent, define the multiphase turbulence model.
Models –› Viscous –› Edit

5. If body forces are present, enable gravity and specify the gravitational acceleration.
Cell Zone Conditions –› Operating Conditions...
6. Specify the boundary conditions, including the secondary-phase volume fractions at flow
boundaries and (if you are modeling wall adhesion in a VOF simulation) the contact angles at walls.
Boundary Conditions

7. Set any model-specific solution parameters.
Solution Controls
8. Initialize the solution and set the initial volume fractions for the secondary phases.

Solution Initialization −→ Patch...
9. Calculate a solution and examine the results. Post processing and reporting of results are
available for each phase that is selected.

(b) Enabling the Multiphase Model

To enable the VOF, mixture, or Eulerian multiphase model, select Volume of Fluid, Mix-ture, or
Eulerian as the Model in the Multiphase Model dialog box (Figure 24.2.1).
Models –› Multiphase –› Edit

The dialog box will expand to show the relevant inputs for the selected multiphase model.
If you selected the volume of fluid (VOF) model, the inputs are as follows:
1. Number of phases

2. Volume fraction scheme (explicit or implicit)
3. (Optional) inclusion of open channel flow
4. (Optional) inclusion of open channel wave boundary conditions

5. (Optional) inclusion of the implicit body force formulation

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