Defining the Phase Interactions

Using the Multiphase Interaction model, you can define the interaction between the air and liquid phases.

In this tutorial, you are interested in the surface tension of glycerine. Therefore, use the Surface Tension Force and VOF multiphase interaction models.

When you create a phase interaction, you select the primary phase first, and then the secondary phase. In this simulation, the primary phase is glycerine and the secondary phase is air.

To define the phase interactions:

  1. In the Injector continuum, right-click the Models > Multiphase Interaction > Phase Interactions node and select New > C3H8O3 > Air.
  2. For the Phase Interaction 1 phase interaction, select the following models:

    Group Box

    Model

    Optional Models

    Interface Momentum Dissipation

    Surface Tension Force

    Multiphase Material (selected automatically)

  3. Click Close.
The value of the surface tension coefficient is changed for the phase interaction.
  1. Select the Phase Interaction 1 > Models > Multiphase Material > Material Properties > Surface Tension > Constant node and set Value to 0.059688 N/m.
  2. Save the simulation.