About Initial Turbulence

Initial turbulence defines the values of certain turbulence parameters at the start of a flow simulation.

See Also
Applying Initial Turbulence for the SST k-omega Turbulence Model
Applying Initial Turbulence for the Realizable k-epsilon Turbulence Model
Applying Initial Turbulence for the Spalart-Allmaras Turbulence Model

Turbulence Specification Method

The available set of initial turbulence specification options depends on your choice of turbulence model in fluid physics. The following table summarizes the specification methods available for each model:

Turbulence Model
Specification Method SST k-omega Realizable k-epsilon Spalart-Allmaras
Viscosity ratio

Intensity - Length scale





Intensity - Viscosity ratio



Turbulent viscosity

K-omega

K-epsilon

The specification methods define turbulence in the following ways:

Option Description
Viscosity ratio Define turbulence by specifying the eddy viscosity ratio.
Intensity - Length scale Define turbulence by specifying the turbulence intensity, characteristic length scale, and velocity scale.
Intensity - Viscosity Ratio Define turbulence by specifying the turbulence intensity, characteristic length scale, and velocity scale.
Turbulent viscosity Define turbulence by specifying the kinematic eddy viscosity.
K-Omega Define turbulence by specifying the turbulent kinetic energy and energy dissipation rate.
K-epsilon Define turbulence by specifying the turbulent kinetic energy and dissipation rate.