Abstract
Tidal turbines are entering an industrial phase and farms will soon be installed. In order to optimize the power output of tidal farms, a good understanding of the interactions between the ambient turbulence and a single turbine is crucial. Computational Fluid Dynamics, and more precisely Large Eddy Simulation, is one way of acquiring such knowledge. This study proposed a comparison between a Lattice Boltzmann Method LES approach and a Navier-Stokes LES approach to model the wake of a tidal turbine. Numerical results are compared with experimental results and a relatively good concordance is observed. Differences inherent to the approaches are then pointed out.
Highlights
T IDAL turbines are Marine Renewable Energy (MRE) devices that extract the kinetic energy from tidal currents
The Lattice Boltzmann Method (LBM) and NS simulations are compared with the experiment described in Mycek et al (2014) [4]
Simulations were compared to experimental results obtained from flume tank measurements
Summary
T IDAL turbines are Marine Renewable Energy (MRE) devices that extract the kinetic energy from tidal currents. Most of tidal turbines only work in areas where tidal currents are over 2.0m.s−1. All those sites are characterized by high turbulence rates. Turbulence rate at EMEC site, Fall of Warness, is around 10 % [1]. Turbulence acts on the machine in several ways [2]. It can affects the power coefficient [3] and the wake [4]. Tidal turbines will be set up in farms in order to maximize energy extraction and reduce costs. A good knowledge of the wake of a single tidal turbine in a turbulent flow is essential to optimize the layout of a farm
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