4.17.2. Selecting a Model

In principle, there are a large number of models that can be combined. Generally, all RANS models in Ansys Fluent can be selected in the RANS region. The RANS model not compatible with ELES is the Spalart-Allmaras model, as a one-equation model cannot provide the required turbulent length scale to the interface method.

With respect to LES models, all algebraic LES models are available (this excludes the Dynamic Kinetic Energy Subgrid-Scale Model — see Dynamic Kinetic Energy Subgrid-Scale Model). While for the RANS portion, a general recommendation is difficult due to the different strength of RANS models for different applications, for the LES region, the WALE model is generally considered a suitable choice.