FN Archimer Export Format
PT C
TI Experimental characterisation of the waves propagating against current effects on the wake of a wide bathymetric obstacle
BT 
AF SAOULI, Yanis
   MAGNIER, Maelys
   GERMAIN, Gregory
   GAURIER, Benoît
   DRUAULT, Philippe
AS 1:1;2:1,2;3:1;4:1;5:2;
FF 1:PDG-REM-RDT-LHYMAR;2:PDG-REM-RDT-LHYMAR;3:PDG-REM-RDT-LHYMAR;4:PDG-REM-RDT-LHYMAR;5:;
C1 Ifremer, Marine Hydrodynamic Laboratory, Boulogne-sur-Mer, France
   Institut Jean Le Rond d’Alembert, Sorbonne Université, CNRS, Paris
C2 IFREMER, FRANCE
   UNIV SORBONNE, PARIS
SI BOULOGNE
SE PDG-REM-RDT-LHYMAR
UR https://archimer.ifremer.fr/doc/00809/92076/98033.pdf
LA English
DT Proceedings paper
AB 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. 
PY 2022
PD NOV
CT Actes des 18èmes Journées de l'Hydrodynamique - JH2022, du 22 au 24 novembre 2022, Poitiers. Session : Energies marines renouvelables. 12p.
ID 92076
ER

EF