This section describes the theory behind the Standard, RNG, and Realizable 
-
models. Information is presented in the following sections:
- 4.3.1. Standard k-ε Model
- 4.3.2. RNG k-ε Model
- 4.3.3. Realizable k-ε Model
- 4.3.4. Modeling Turbulent Production in the k-ε Models
- 4.3.5. Remarks on the Linearization of Destruction Terms
- 4.3.6. Effects of Buoyancy on Turbulence in the k-ε Models
- 4.3.7. Turbulence Damping
- 4.3.8. Effects of Compressibility on Turbulence in the k-ε Models
- 4.3.9. Convective Heat and Mass Transfer Modeling in the k-ε Models
For details about using the models in Ansys Fluent, see Modeling Turbulence and Setting Up the k-ε Model in the User's Guide.
This section presents the standard, RNG, and realizable 
-
models. All three models have similar forms, with transport equations for
and 
. The major differences in the models are as follows:
the method of calculating turbulent viscosity
the turbulent Prandtl numbers governing the turbulent diffusion of
and 
the generation and destruction terms in the
equation
The transport equations, the methods of calculating turbulent viscosity, and model constants are presented separately for each model. The features that are essentially common to all models follow, including turbulent generation due to shear buoyancy, accounting for the effects of compressibility, and modeling heat and mass transfer.