Investigation of various wall modeling approaches for LES in the presence of mild pressure gradients

Thiry, Olivier;Duponcheel, Matthieu;Winckelmans, Grégoire
(2016) 11th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements (ETMM11) — Location: Palerme, Sicile, Italie (21.September.2016)

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This work focuses on the investigation of various wall modeling strategies for the large-eddy simulation (LES) of high Reynolds number wall-bounded turbu- lent flows with mild pressure gradients. A half channel flow setup at Reτ = 2000 is considered. A periodic blowing and suction at the upper boundary is added to obtain a fluctuating pressure gradient. A wall-resolved LES is first performed to provide a reference solution and insight into the flow topology. Wall-modeled LES is then considered. Two strategies are investigated and compared. First, algebraic models are considered, without and with pressure gradient correction to the law of the wall used by the model. We also investigate various spatial and temporal averaging techniques when using the model. Second, RANS sub-layer models are considered, without and with pressure gradient corrections to the turbulent eddy viscosity model.
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Thiry, O., Duponcheel, M., & Winckelmans, G. (2016). Investigation of various wall modeling approaches for LES in the presence of mild pressure gradients. 11th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements (ETMM11), Palerme, Sicile, Italie. https://hdl.handle.net/2078.5/268568