12.10 Setting Up the Reynolds Stress Model

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

• Linear pressure-strain model (see this section in the separate Theory Guide)

• Quadratic pressure-strain model (Section  12.13.14)

• Low-Re Stress-Omega (Section  12.13.15)

Figure 12.10.1: The Viscous Model Dialog Box Displaying the Reynolds Stress Model Options

The following Reynolds-stress options are available:

• wall boundary conditions for the Reynolds stresses from the $k$ equation (Section  12.13.13) for the linear and quadratic pressure-strain models

• wall reflection effects on Reynolds stresses (Section  12.13.12) for the linear pressure-strain model

Other options that are available based on your case setup include:

• viscous heating (always activated for the density-based solvers) (Section  12.13.1)

• inclusion of buoyancy effects on $\epsilon$ (see this section in the separate Theory Guide)

For the Reynolds stress model, the following near-wall treatments are available (see this section in the separate Theory Guide):

• standard wall functions

• non-equilibrium wall functions

• enhanced wall treatment

If wall boundary conditions for the Reynolds stresses from the $k$ equation and/or wall reflection effects on Reynolds stresses are/is selected, then all the above near-wall treatments are available for selection.

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

• pressure gradient effects (Section  12.13.10)

• thermal effects (Section  12.13.11)

If the quadratic pressure-strain model is selected, then you can set either the standard wall functions or the non-equilibrium wall functions.

If Low-Re Stress-Omega is selected, you cannot select any near-wall treatments and should use an LRN mesh. You do have the option of selecting any or all of the following $k-\omega$ options:

• low-Re corrections (Section  12.13.7)

• shear flow corrections (Section  12.13.9)

Figure 12.10.2: The Viscous Model Dialog Box Displaying the Low-Re Stress-Omega Model Options