Set Up Immiscible Multiphase Modeling

  1. From the Flow ribbon, click the Physics tool.

    Figure 1.
  2. Under the Physics models settings, change the flow radio button to Multiphase.
  3. Change the Multifluid type to Immiscible.
  4. Select a field interaction material model from the drop-down menu or click Material Library to create, edit, and manage custom material models.
After setting up the immiscible multiphase physics, you have the option to choose the incoming fluid when defining inlet boundary conditions.

Figure 2.
In addition, you can select the fluid as a variable when defining initial conditions in the Solution ribbon.

Figure 3.