Defining Turbulence in Fluid Physics

You can specify the algorithm that describes the behavior of turbulent flow.

  1. From the Procedures section of the action bar, click Physics .
  2. Select the Turbulence model you want to use, if any, for the simulation:
    OptionDescription
    None Turbulence effects are not included. You might want to select this option if the Reynolds number is relatively low, because this value indicates that the flow is laminar and turbulence is not present. In addition, specifying no turbulence model in the fluid physics can reduce solution time.

    However, if the Reynolds number is large enough for turbulence to exist, you should specify a turbulence model. Otherwise, the calculation will be inaccurate because the solver wlil not account for the effects of turbulence.
    SST k − ω The shear-stress transport (SST) model is a two-equation model that evolves equations for the turbulent kinetic energy ( k ) and the specific energy dissipation rate ( ω ≈ ε / k ).
    Realizable k − ε A two-equation model that solves equations for the turbulent kinetic energy ( k ) and the energy dissipation rate ( ε ).
    Spalart-Allmaras A one-equation model that evolves a variable representing a pseudo-eddy viscosity.
  3. After you select a turbulence model, you can also adjust any of its parameters if you want to customize aspects of the turbulence behavior. Expand the Turbulence model parameters expander and change the parameters to ones suitable for your simulation.