15.10. Setting Up the Reynolds Stress Model

If you choose the RSM, the following submodels are available:

-based Reynolds stress models:
- linear pressure-strain model (see Linear Pressure-Strain Model in the Theory Guide)
- quadratic pressure-strain model (see Quadratic Pressure-Strain Model in the Theory Guide)
-based Reynolds stress models:
- Stress-Omega (see Stress-Omega Model in the Theory Guide)
- Stress-BSL (see Stress-BSL Model in the Theory Guide)

Figure 15.18: The Viscous Model Dialog Box Displaying the Reynolds Stress Model Options

The following options are specific to the Reynolds-stress models based on the -equation:

wall boundary conditions for the Reynolds stresses from the equation (Solving the k Equation to Obtain Wall Boundary Conditions) for the linear and quadratic pressure-strain models
wall reflection effects on Reynolds stresses (Including the Wall Reflection Term) for the linear pressure-strain model
near-wall treatments (see Near-Wall Treatments for Wall-Bounded Turbulent Flows in the Theory Guide):
- standard wall functions
- scalable wall functions
- non-equilibrium wall functions
- enhanced wall treatment (only for the linear pressure-strain model)

If you choose the enhanced wall treatment, the following options are available:

pressure gradient effects (Including Pressure Gradient Effects)
thermal effects (Including Thermal Effects)

Both the Reynolds stress models based on the - (Stress-Omega) and BSL-equation (Stress-BSL) use a -insensitive wall treatment. For details on the available options, see y+-Insensitive Near-Wall Treatment for ω-based Turbulence Models in the Fluent Theory Guide. A low Re-number (LRN) mesh is recommended for these models.

For Stress-Omega, you do have the option of selecting any or all of the following options:

low-Re corrections (Low-Re Corrections)
shear flow corrections (Shear Flow Corrections)

For Stress-BSL, you have the option of combining the GEKO model with the Stress-BSL model. For details on the GEKO model, see Setting up the Generalized k-ω (GEKO) Model.

For both Stress-Omega and Stress-BSL, the following scale-resolving simulation option is available: Scale-Adaptive Simulation (Setting Up Scale-Adaptive Simulation (SAS) Modeling).

Figure 15.19: The Viscous Model Dialog Box Displaying the Stress-Omega Model Options

Other options that are available for both - and -based Reynolds stress models depending on your case setup include:

viscous heating (always enabled for the density-based solvers) (Including the Viscous Heating Effects)
inclusion of compressibility effects (Including the Compressibility Effects Option)
inclusion of buoyancy effects on (see Effects of Buoyancy on Turbulence in the k-ε Models in the Theory Guide)

Note: The -based Reynolds stress models are not compatible with the Eulerian multiphase model.