A hybrid temporal LES/RANS formulation based on a two-equation subfilter model

Yacine Bentaleb (1) , Remi Manceau (2, 1)

1 PPrime [Poitiers] - Institut Pprime [UPR 3346]
2 CNRS - Centre National de la Recherche Scientifique

A novel hybrid model for statistically stationary flow simulations at moderate to high Reynolds numbers is presented. Based on a consistent formalism developed for seamless hybrid temporal LES/RANS methodologies (Fadai-Ghotbi et al., 2010b; Schiestel and Dejoan, 2005), the Temporal Partially-Integrated Transport Model (TPITM) approach is used to derive a two-equation subfilter model, consistent with the k − ω SST model in the RANS limit, i.e., when the temporal filter width goes to infinity. Comparisons are made with a widespread hybrid RANS/LES model, the DES-SST formulation (Menter et al., 2003), which tends to the same RANS model in the RANS zones, but uses the Detached Eddy Simulation (DES) methodology to control the transition from RANS to LES. The paper discusses the features and capabilities of both approaches.

Domaines: Milieux fluides et réactifs

Yacine Bentaleb, Remi Manceau. A hybrid temporal LES/RANS formulation based on a two-equation subfilter model. Seventh International Symposium on Turbulence and Shear Flow Phenomena, 2011, Ottawa, Canada. ⟨hal-02130108⟩