Modélisation de la turbulence engendrée par la morphologie du fond dans le Raz Blanchard : approche locale avec la LBM-LES

Abstract : Renewable energy development calls for exploitation of new energy resources. Tidal stream power harvesting is now close to the industrialisation step. Still, turbulent hydrodynamic conditions at tidal sites are not well understood. This thesis aims to investigate the local scale effect of sea bottom roughnesses on energetic vortex generation with computational fluid simulations using the lattice Boltzmann method. This method is highly indicated for unsteady flow simulations of complex domains. First, the physical phenomena involved in vortex emission around canonical macroroughnesses are described. Vortex merging is identified in the generation process of energetic vortices. Then, such physical events are reproduced in the case of environmental flow simulations using a real seabed morphology. These simulations are validated on in situ measured data, and lead to a better understanding of the sea bottom effect on tidal stream site turbulence. They demonstrate the role of geological faults on the local turbulence.
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Philippe Mercier. Modélisation de la turbulence engendrée par la morphologie du fond dans le Raz Blanchard : approche locale avec la LBM-LES. Mécanique des fluides [physics.class-ph]. Normandie Université, 2019. Français. ⟨NNT : 2019NORMC206⟩. ⟨tel-02310727⟩

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