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Journal Articles Flow, Turbulence and Combustion Year : 2022

Development and Validation of a new formulation of Hybrid Temporal Large Eddy Simulation

Abstract

Hybrid RANS-LES approaches have aroused interest for years since they provide unsteady information at a reduced numerical cost compared to LES. In the hybrid context, the use of temporal filtering, to control the energy partition between resolved and modeled scales, ensures a consistent bridging between RANS and LES models. In this regard, a new formulation of Hybrid Temporal Large Eddy Simulation (HTLES) is developed, aiming at improving the theoretical foundation of the model associated with an eddy-viscosity closure. The analytical development is performed, applying the Hybrid-Equivalence criterion, and the model is calibrated in decaying isotropic turbulence. In addition, an upgraded version of the approach is proposed to improve the behavior of the model in near-wall regions, introducing a two-fold shielding function and an internal consistency constraint to provide a suitable control of the RANS-to-LES transition. Applying HTLES to the k-w-SST model, the validation process is carried out on channel and periodic-hill flows, over a range of grids and Reynolds numbers. The predictive accuracy and the robustness to grid coarsening are assessed in these cases, ensuring that HTLES offers a cost-saving alternative to LES.
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Dates and versions

hal-03206747 , version 1 (23-04-2021)

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Vladimir Duffal, Benoît de Laage de Meux, Remi Manceau. Development and Validation of a new formulation of Hybrid Temporal Large Eddy Simulation. Flow, Turbulence and Combustion, 2022, 108, pp.42. ⟨10.1007/s10494-021-00264-z⟩. ⟨hal-03206747⟩
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