Experimental characterisation of the waves propagating against current effects on the wake of a wide bathymetric obstacle

Type Proceedings paper
Date 2022-11
Language English
Other localization https://jh2022.sciencesconf.org/413878
Author(s) Saouli Yanis1, Magnier MaelysORCID1, 2, Germain GregoryORCID1, Gaurier BenoîtORCID1, Druault Philippe2
Affiliation(s) 1 : Ifremer, Marine Hydrodynamic Laboratory, Boulogne-sur-Mer, France
2 : Institut Jean Le Rond d’Alembert, Sorbonne Université, CNRS, Paris
Meeting JH2022 - 18èmes Journées de l'Hydrodynamique, 22-24 Novembre 2022, Poitiers
Source Actes des 18èmes Journées de l'Hydrodynamique - JH2022, du 22 au 24 novembre 2022, Poitiers. Session : Energies marines renouvelables. 12p.
Abstract

The upcoming development of tidal turbine farms requires a great understanding of the environment in which they will be installed. The aim of this study is to better understand the effects of surface waves on the high-energy turbulence generated by the interaction between tidal currents and the bathymetry. To do so, specific conditions are reproduced in the IFREMER’s flume tank at Boulogne-sur-Mer. The bathymetry is represented by a square-based cylinder mounted on the tank floor perpendicularly to the current, in Froude similarity, at a scale of 1:20. The chosen wave conditions make it possible to study the wave frequency and wave amplitude effects on the obstacle wake development. From PIV measurements, the results show that, for a current speed of 0.8 m/s, low frequency waves (T p > 13 s at sea) are the most impactful. When the frequency is high, the surface wave amplitude must be greater (Hs > 3 m at sea) to modify the vortex shedding behind the obstacle. Whenever the cylinder wake is altered by the waves, the wake goes faster towards the surface. The vortex shedding, already present without waves, becomes more energetic and focuses on a sub-harmonic of the wave frequency.

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Saouli Yanis, Magnier Maelys, Germain Gregory, Gaurier Benoît, Druault Philippe (2022). Experimental characterisation of the waves propagating against current effects on the wake of a wide bathymetric obstacle. Actes des 18èmes Journées de l'Hydrodynamique - JH2022, du 22 au 24 novembre 2022, Poitiers. Session : Energies marines renouvelables. 12p. https://archimer.ifremer.fr/doc/00809/92076/