Setting Boundary Conditions

Define the boundary types and specify the appropriate property values. The geometry that is used for this tutorial has six boundaries. Assign no-slip wall conditions to five of them, and assign the remaining boundary a pressure boundary condition.

To set the boundary conditions:

  1. Rename the Default_Fluid 2D node to Fluid.
  2. Edit the Fluid > Boundaries node and set the boundary types as follows:

    Boundary

    Type

    Bottom

    Wall

    Left

    Wall

    Middle

    Wall

    Right

    Wall

    TopRight

    Wall

    TopLeft

    Pressure Outlet

The default conditions are suitable for the wall boundaries, but the conditions for the pressure boundary must be reset.

  1. Edit the TopLeft > Physics Values node and set the following properties:
    Node Property Setting
    Turbulence Intensity Value 0.01
    Turbulent Viscosity Ratio Value 100.0
    Volume Fraction Value [1.0, 0.0]

    The Volume Fraction setting enforces the condition that only liquid water enters the solution domain through that boundary.

  2. Save the simulation.