What Is the Standard Spalart-Allmaras Model?

In its standard form, the Spalart-Allmaras model is a low-Reynolds number model, meaning that it is designed to be applied without wall functions. According to the model's formulation, the entire turbulent boundary layer, including the viscous sublayer, ought to be accurately resolved and the model can be applied on fine meshes (small values of

). This model can be used with the all

wall treatment for all simulations.

Standard Spalart-Allmaras Properties

Deformation Option

Selects the modified or standard production term.

Modified

Selects the modified production term. This is recommended for most simulations. See Eqn. 175.

Original

Selects the standard production term. This option allows comparison with results from other CFD codes that lack the modified production term. See Eqn. (173).

Convection

For guidance on selecting a convection, see Diffusion Term .

1st-order

Selects the first-order convection.

2nd-order

Selects the second-order convection.

Standard Spalart-Allmaras Expert Properties

Unless you are thoroughly familiar with the theoretical aspects of this model and the discretization techniques used in STAR-CCM+, we recommend that you not make any changes within the Expert category. The values in that category reflect both the model's design and discretization approaches that have been optimized for accuracy and performance. Tampering with them may diminish the effectiveness of the model.