Development and validation of a hybrid RANS/LES approach based on temporal filtering

Vladimir Duffal (1) , Benoît de Laage de Meux (1) , Remi Manceau (2, 3, 4)

1 EDF R&D MFEE - Mécanique des Fluides, Energies et Environnement
2 CAGIRE - Computational AGility for internal flows sImulations and compaRisons with Experiments
3 LMAP - Laboratoire de Mathématiques et de leurs Applications [Pau]
4 CNRS - Centre National de la Recherche Scientifique

To address the challenge of controlling the energy partition in hybrid RANS-LES methods, the use of a consistent operator based on temporal filtering is desirable. This formalism leads to the development of a consistent continuous hybrid RANS-LES approach called Hybrid Temporal LES (HTLES). In this paper, an upgraded version of HTLES is presented, focusing on improving the model for wall-bounded flows. Notably, a shielding function is integrated in the model to impose the RANS behavior in the near-wall regions. The calibration and validation of the hybrid method applied to the standard k-ω -SST model is then carried out on several test cases: decaying isotropic turbulence, channel flow and periodic-hill flow. The new version of the model fulfills the specifications: the correct subfilter dissipation; the correct migration from RANS to LES in the boundary layer; the robustness of the results to grid coarsening; the accuracy of the predictions at a reasonable computational cost.

Domaines: Milieux fluides et réactifs

Vladimir Duffal, Benoît de Laage de Meux, Remi Manceau. Development and validation of a hybrid RANS/LES approach based on temporal filtering. ASME - JSME - KSME Joint Fluids Engineering Conference 2019, Jul 2019, San Francisco, CA, United States. ⟨hal-02128250⟩