Creating Phases and Selecting Phase Models

Here you create two phases and define the physics models for each. The continuous phase is water and the dispersed phase is hexane. The water and hexane phases are both modeled as liquid with constant density. The Adaptive Multiple Size-Group (AMUSIG) model is used to predict the size distribution of hexane droplets in the flow.

To create the phases and select the phase models:

Create the continuous liquid phase, water.
  1. In the Physics 1 continuum, right-click the Models > Multiphase > Phases node and select New.
  2. Rename the Phase 1 node to Water.
The Reynolds Stress Turbulence model is applied as the turbulence in the water phase is anisotropic.
  1. For the Water phase, right-click the Models node and select the following models in order:
    Group Box Model
    Enabled Models

    Turbulent (selected automatically)

    Flow (selected automatically)

    Material

    Liquid

    Equation of State

    Constant Density

  2. Click Close.
To define the dispersed liquid phase, hexane:
  1. Create a second phase and rename it to Hexane.
  2. For the Hexane phase, select the following models in order:
    Group Box Model
    Enabled Models

    Turbulent (selected automatically)

    Flow (selected automatically)

    Material

    Liquid

    Equation of State

    Constant Density

    Optional Models

    Particle Size Distribution

    Particle Size Distribution

    Adaptive Multiple Size-Group

  3. Click Close.
    The tree below the Phases node now appears as shown below.


For the dispersed phase, replace the default fluid with Hexane.
  1. Right-click Phases > Hexane > Models > Liquid > H2O and click Replace with....
  2. In the Replace Material dialog, select C6H14 (Hexane) and then click OK.

    The default material properties of both fluids are suitable for this simulation.

To specify the Adaptive Multiple Size-Group properties for the dispersed hexane phase:

  1. Edit the Phases > Hexane > Models node and set the following properties:
    Node Property Setting
    Adaptive Multiple Size-Group Number of Size-Groups 5
    Velocity Option Multi-Speed
  2. Save the simulation.