Use of Large-Eddy Simulation for the bed shear stress estimation over a dune |
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Institution: | Normandy University,University of Caen Normandy,LUSAC,EA 4253,60 Rue Max Pol Fouchet,CS 20082,50130,Cherbourg-en-Cotentin,France;LNHE,EDF R&D,6 Quai Watier,78400,Chatou,France;Normandy University,University of Caen Normandy,LUSAC,EA 4253,60 Rue Max Pol Fouchet,CS 20082,50130,Cherbourg-en-Cotentin,France;LNHE,EDF R&D,6 Quai Watier,78400,Chatou,France |
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Abstract: | Environmental flows are generally characterized by complex bed morphology and high current speeds. Such configurations favor the formation of vortex structures that strongly affect hydrody-namics and sediment transport. Large-Eddy Simulation (LES) enables investigation of the dynam-ics of the largest turbulence scales and, thanks to enhanced calculation resources, has now become applicable for simulating environmental flows. In this paper, a LES approach is developed in a CFD code (TELEMAC-3D), which was originally developed to simulate free surface flows using RANS methods. The present developments involve implementing subgrid models, boundary con-ditions and numerical schemes suitable for LES. The LES version of TELEMAC-3D was validated by comparing results on the model with experimental data for flow past a cylinder. Then, the model was applied to a test case representing flow over dunes. After validating the hydrodynamics, the model was used to assess the bottom shear stress, using both a RANS and a LES approach. Com-parison highlighted the potential contribution of LES to investigating the hydrodynamic forces acting on the bottom. |
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Keywords: | Turbulence Environmental flows Large eddy simulations Bed shear stress |
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