8.2 Turbulence models

The turbulenceProperties dictionary is read by any solver that uses models for turbulence or large-eddy simulation (LES). The entries required in the turbulenceProperties dictionary differ depending on whether the solver models turbulence or LES. The entries are listed for both turbulence and LES in Table 8.4.

Entries for turbulence modelling turbulenceModel Name of turbulence model turbulence Switch to turn turbulence modelling on/off <turbulenceModel>Coeffs Dictionary of coefficients for the respective turbulenceModel wallFunctionCoeffs Dictionary of wall function coefficients Entries for LES LESmodel Name of LES model delta Name of delta model <LESmodel>Coeffs Dictionary of coefficients for the respective LESmodel <delta>Coeffs Dictionary of coefficients for each delta model kappa von Kármán’s constant wallFunctionCoeffs Dictionary of wall function coefficients Table 8.4: Keyword entries in the turbulenceProperties dictionary.

The incompressible and compressible turbulence models, isochoric and anisochoric LES models and delta models are all named and described in Table 3.9. The user may consult turbulenceProperties dictionary from a relevant example case to get a full list of coefficients required for each model and their default values. The required coefficients may differ depending on whether the turbulence models are incompressible or compressible and whether the LES models are isochoric or anisochoric. For reference, these different categories of turbulence/LES models are represented in the turbulenceProperties dictionaries of the following example cases in the $OpenFOAM_TUTORIALS directory:

turbFoam/cavity

Incompressible turbulent models;

sonicTurbFoam/prism

Compressible turbulent models;

oodles/pitzDaily

Isochoric LES models;

Xoodles/pitzDaily

Anisochoric LES models;