Modeling Mixture Turbulence

You can model the effects of turbulence on the multiphase mixture.

The steps in this procedure are intended to follow on from Step 2 in Modeling Eulerian Multiphase Flow.

To model mixture turbulence:

  1. In the Physics Model Selection dialog, choose the following models:

    Group Box

    Model

    Turbulence Reynolds-Averaged Navier-Stokes (selected automatically when Mixture Turbulence is activated)
    Reynolds-Averaged Turbulence

    One of the following:

    • K-Epsilon Turbulence

      This model provides a good compromise between robustness, computational cost and accuracy. It is appropriate for industrial-type applications that contain complex recirculation, with or without heat transfer.

      See K-Epsilon Turbulence.

    • K-Omega Turbulence

      This model is similar to the K-Epsilon model in that two transport equations are solved, but differ in the choice of the second transported turbulence variable. This model is suitable for aerospace applications.

      See K-Omega Turbulence.

    • Reynolds Stress Turbulence

      These models can predict complex flows more accurately than eddy viscosity models because the transport equations for the Reynolds stresses naturally account for the effects of turbulence anisotropy, streamline curvature, swirl rotation and high strain rates.

      See Reynolds Stress Transport (RST) Turbulence.
    K-Epsilon Turbulence Models, K-Omega Turbulence Models, or Reynolds Stress Turbulence Models (corresponding to previous selection) Select any model.

    See Mixture Turbulence Models.
    Wall Treatment (corresponding to previous selection) Corresponding model selected automatically.
    Wall Distance Wall Distance (selected automatically)
    Optional Models

    • If you want to apply a custom scaling factor to the turbulent viscosity, select Turbulent Viscosity User Scaling

      Use this model when the turbulent flow includes a range or mixture of densities.

      See Scaling Turbulent Viscosity.

    • If you want to suppress turbulence in a particular region, select Turbulence Suppression.

      See Turbulence Suppression Model.

Open the Phase Interaction Model Selection dialog and select the appropriate optional models.
  1. If you want to model the interaction between the dispersed phase and the surrounding turbulent eddies, select Turbulent Dispersion Force.
    See Turbulent Dispersion Force.
  2. If you want to model the turbulence due to the presence of bubbles, droplets, or particles in the continuous phase, select Particle Induced Turbulence Source.
    See Particle Induced Turbulence Source Models.
  3. Set the appropriate solver settings.
    See K-Epsilon Solvers Reference, K-Omega Solvers Reference, or Reynolds Stress Solvers Reference.

Return to Modeling Eulerian Multiphase Flow and continue with Step 3.