15.8. Setting Up the Transition SST Model

If you choose the Transition SST model (also known as the - model), the following options are available:

roughness correlation (Transition SST and Rough Walls in the Theory Guide)
near wall treatment (y+-Insensitive Near-Wall Treatment for ω-based Turbulence Models in the Fluent Theory Guide)
viscous heating (always enabled for the density-based solvers) (Including the Viscous Heating Effects)
inclusion of curvature correction (Including the Curvature Correction for the Spalart-Allmaras and Two-Equation Turbulence Models)
inclusion of production limiters (Including Production Limiters for Two-Equation Models)
scale-resolving simulation options: either Scale-Adaptive Simulation (Setting Up Scale-Adaptive Simulation (SAS) Modeling), Detached Eddy Simulation (Setting Up DES with the Transition SST Model), Stress-Blended Eddy Simulation (Including the SDES or SBES Model with RANS Models), or Shielded Detached Eddy Simulation (Including the SDES or SBES Model with RANS Models).

Figure 15.16: The Viscous Model Dialog Box for the Transition SST Model

You can customize your transition correlations, which are used in conjunction with the Transition SST model. The user-defined functions that you can hook are:

transition length function (F_length).
critical momentum thickness Reynolds number (Re_thetac).
transition onset momentum thickness Reynolds number (Re_thetat).

For detailed information about the transition correlation UDFs, see DEFINE_TRANS UDFs in the Fluent Customization Manual.