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A comprehensive assessment of turbulence at a tidal-stream energy site influenced by wind-generated ocean waves 5
Thiébaut, Maxime; Filipot, Jean-francois; Maisondieu, Christophe; Damblans, Guillaume; Duarte, Rui; Droniou, Eloi; Chaplain, Nicolas; Guillou, Sylvain.
Velocity measurements collected by an upward-looking acoustic Doppler current profiler were used to provide the first study of ambient turbulence in Alderney Race. Turbulence metrics were estimated at mid-depth during peak flooding and ebbing tidal conditions. The dissipation rate ε and the integral lengthscale (L) were estimated using two independent methods: the spectral method and the structure function method. The spectral method provided ε and (L) estimates with standard deviations twice lower than that obtained from the structure function method. Removal of wave and Doppler noise-induced bias when estimating the dissipation rate was shown to be a crucial step in turbulence characterization. It allowed for a significant refining in (L) estimates...
Tipo: Text Palavras-chave: Turbulence; Tidal energy; Wave; Doppler noise; ADCP; Alderney Race.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00592/70394/68478.pdf
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Experimental investigation of the seabed roughness effect on the hydrodynamical behavior of a submarine cable under current and wave conditions. 5
Marty, Antoine; Germain, Gregory; Facq, Jean-valery; Gaurier, Benoit; Damblans, Guillaume; Germain, Nicolas; Harris, Jeffrey; Maison, Antoine; Peyrard, Christophe; Relun, Nicolas.
Submarine cable behaviour is experimentally studied in the frame of the France Energies Marines project STHYF. In order to evaluate on-bottom stability of cables placed on rocky seabed with high roughness and submitted to combined wave and strong current, hydrodynamic loads are measured on a fixed slender cylinder closely fixed to a horizontal plate, with or without large roughness. A specified set of load cases (forced oscillations, current, forced oscillation + current) is considered to assess the hydrodynamic loads acting on the cylinder placed near a wall for varying gap-to-diameter ratios. The roughness effects on cylinder loads and on the flow are studied in detail. The result show a significant difference between rough and smooth bottom...
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Ano: 2020 URL: https://archimer.ifremer.fr/doc/00660/77244/78696.pdf
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Marine growth effect on the hydrodynamical behavior of a submarine cable under current and wave conditions. 5
Marty, Antoine; Berhault, Christian; Damblans, Guillaume; Facq, Jean-valery; Gaurier, Benoit; Germain, Gregory; Soulard, Thomas; Schoefs, Franck.
This document describes the experimental set-up of OMDYN2 and LEHERO-MG projects. The study aims to quantify the impact of biofouling on the dynamic behaviour of an underwater power cable by analysing the hydrodynamic coefficients, such as drag and added mass coefficients. Experiments have been carried out in the wave and current basin of IFREMER, located at Boulogne-sur-mer, in order to compare the dynamics of several cylinders with or without roughness. Three cylinders are tested, two cylinders with different roughnesses and one smooth cylinder. The studied roughnesses concern realistic marine growth and have therefore significantly bigger dimensions (like mussels) than roughness studied in the research literature on the subject. Tests are conducted...
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Ano: 2020 URL: https://archimer.ifremer.fr/doc/00660/77245/78697.pdf
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