Turbulence

On the Turbulence tab you set the special parameters required by turbulent convection computation.

Convection dialog, Turbulence tab 

Figure 49. Convection dialog, Turbulence tab

Item

Description

Underrelaxation

The underrelaxation factors for k-ε turbulence transport equations.

  • Turbulent energy: underrelaxation factor for turbulent energy equation, recommended is 0.1.

  • Eddy dissipation: underrelaxation factor for eddy dissipation equation, recommended is 0.1.

  • Turbulent viscosity: underrelaxation for the change in the turbulent viscosity, recommended is 0.08.

Parameters

Specifies the parameters for the linear equation solvers.

  • Max. inner iterations

  • Desired residuum

  • Set last triangle at

    Specifies the value of k-ε equations residuum when the turbulent viscosity starts to be computed in the triangles laying at the fluid-solid boundaries. Notice that the turbulent viscosity is not computed from the beginning, because of the numerical stability reasons.

Related Procedures

Setting turbulent convection on unstructured mesh parameters