Specifying Initial Conditions and Gravity

As initial condition, the aeration tank is completely filled with water and no air. You set gravity to act in the negative y direction. You use the density of the continuous phase as the reference density.

To set the initial conditions and gravity:

  1. Edit the Physics 1 > Models > Multiphase > Phases > Water > Initial Conditions > Volume Fraction node and set Value to 1.0.
  2. Edit the Reference Values node and set the following properties:
    Node Property Setting
    Gravity Value [0.0, -9.81, 0.0] m/s^2
    Reference Density Value 997.561 kg/m^3
  3. Save the simulation.