Modélisation des effets de sillage d'une hydrolienne avec la méthode de Boltzmann sur réseau

Abstract : In a global context where access to energy is a major problem, the exploitation of tidal currents with tidal turbines is of particular interest. Flows in areas with high energy potential suitable for the installation of tidal turbines are often highly turbulent. However, the ambient turbulence has a strong impact on the surrounding hydrodynamics and the turbine operation. A precise prediction of turbulence and wake is fundamental to the optimization of a tidal farm. A numerical model of the flow around the turbine must therefore be accurate and take into account the ambient turbulence. A tool based on the Lattice Boltzmann Method (LBM) is used for this purpose, in combination with a Large Eddy Simulation (LES) approach. The LBM is an unsteady method for modelling fluid flows. A synthetic turbulence method is implemented to take into account the ambient turbulence of tidal sites. Complex geometries, potentially in motion, are modelled using the Immersed Boundary Method (IBM). The implementation of a wall model is carried out in order to reduce the cost of the simulations. These tools are then used to model a turbine in a turbulent environment. The calculations, performed at two different turbulence rates, are compared with experimental and NS-LES results. The LBM-LES models are then used to analyze the wake of the turbine. In particular, it is observed that a low turbulence rate has a significant impact on the propagation of tip-vortices.
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  • HAL Id : tel-02141153, version 1

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Mikaël Grondeau. Modélisation des effets de sillage d'une hydrolienne avec la méthode de Boltzmann sur réseau. Mécanique des fluides [physics.class-ph]. Normandie Université, 2018. Français. ⟨NNT : 2018NORMC257⟩. ⟨tel-02141153⟩

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