Characterisation of an idealised offshore wind farm foundation, under waves and the combination of waves and currents
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1 Characterisation of an idealised offshore wind farm foundation, under waves and the combination of waves and currents Isabel García-Hermosa, J. Lebunetel, N. Abcha, J. Brossard, A. Ezersky, D. Mouazé, G. Perret Laboratoire Ondes et Milieux Complexes U. Le Havre Laboratoire de Morphodynamique Continentale et Côtière U Caen Basse-Normandie igarciahermosa@gmail.com
2 Universities of Caen and Le Havre - Plymouth University Offshore wind farm Foundation EnvironmentaL Impact Assessment INTERREG IV RELEVANCE Marine renewable energy meet governmental targets Offshore wind tech. from onshore -- deeper/ +ø /+masts igarciahermosa@gmail.com INTRO EXP LH EXP CAEN RESULTS SUMMARY 1
3 Characterise changes in hydrodynamics and sea bed around the cylinder Improve understanding of scour processes Objectives Experiments to collect data to inform about processes velocity deficit/ bss/ eddies/ wakes/ turbulence/ scour INTRO EXP LH EXP CAEN RESULTS SUMMARY 2
4 Processes wave and current + cylinder + sediment (interactions) Flow structures: Horseshoe vortex Lee wake vortex The Keulegan-Carpenter number associated to presence/ absence of horseshoe vortex in oscillatory flows U m T KC D U m T D bottom orbital velocity, wave period and the cylinder diameter. Sumer, Christiansen and Fredsoe, 1997 Sumer & Fresdsoe (1997) and Zanke et al (2011) horseshoe vortex suppressed for KC < 6 INTRO EXP LH EXP CAEN RESULTS SUMMARY 3
5 PIV experiments Cylinder + wave + flat immobile bed Changes of wave properties near the structure Incoming wave 35 m long 0.9 m wide 1.2 m depth Glass floor Mobile bed exp Cylinder + REGULAR wave + current + mobile bed Impact of cylinder on waves, currents and mobile bed Incoming wave Mobile bed Wave probes Incoming current 18 m long 0.51 m wide 0.6 m depth INTRO EXP LH EXP CAEN RESULTS SUMMARY 4
6 Cylinder + IRREGULAR wave + flat immobile bed - Le Havre - wave properties near the structure PIV experiments Le Havre vertical Le Havre horizontal Current Wave Bed No No Regular/ Irregular Regular/ Irregular Caen Yes Regular Fixed/ flat Fixed/ flat Mobile sand Flow velocity Free surface PIV U x, U z vertical Next to plane PIV U x, U y horizontal Next to plane U x, U y, U z ADV point u/s and d/s Bed profile N/A N/A laser/ camera igarciahermosa@gmail.com INTRO EXP LH EXP CAEN RESULTS SUMMARY 5
7 PIV upstream jet Flume floor INTRO EXP LH EXP CAEN RESULTS SUMMARY 6
8 PIV vertical laser plane * downstream Extraction of vertical line Smoothing of profile polynomial to calculate derived variables Wave phase velocity igarciahermosa@gmail.com INTRO EXP LH EXP CAEN RESULTS SUMMARY 7
9 PIV vertical laser plane * eddy downstream igarciahermosa@gmail.com INTRO EXP LH EXP CAEN RESULTS SUMMARY 8
10 PIV vertical laser plane * eddy downstream igarciahermosa@gmail.com INTRO EXP LH EXP CAEN RESULTS SUMMARY 8
11 PIV vertical laser plane * eddy downstream igarciahermosa@gmail.com INTRO EXP LH EXP CAEN RESULTS SUMMARY 8
12 Caen - Cylinder + REGULAR wave + current + mobile bed Assessing changes in waves, currents and mobile bed due to the presence of a mast Mobile sediment Le Havre vertical Le Havre horizontal Current Wave Bed No No Regular/ Irregular Regular/ Irregular Caen Yes Regular Fixed/ flat Fixed/ flat Mobile sand Flow velocity Free surface PIV U x, U z vertical Next to plane PIV U x, U y horizontal Next to plane U x, U y, U z ADV point u/s and d/s Bed profile N/A N/A laser/ camera igarciahermosa@gmail.com INTRO EXP LH EXP CAEN RESULTS SUMMARY 9
13 Plan view Approximate position of ADV vertical velocity profiles Current flow Incident wave Data acquisition: laser - camera igarciahermosa@gmail.com INTRO EXP LH EXP CAEN RESULTS SUMMARY 10
14 Bed profile - vertical Plan view Approximate position of ADV vertical velocity profiles Current flow Incident wave Data acquisition: laser - camera igarciahermosa@gmail.com INTRO EXP LH EXP CAEN RESULTS SUMMARY 10
15 S/D Courseulles sur mer & resonance cases 1 min dpt Sy max dpt Sy min dpt Cou max dpt Cou 0, Time (hr) Model time igarciahermosa@gmail.com INTRO EXP LH EXP CAEN RESULTS SUMMARY 11
16 Increase scour depth and extent Top view Data acquired with laser/camera method INTRO EXP LH EXP CAEN RESULTS SUMMARY 12
17 Side view Bed evolution with time INTRO EXP LH EXP CAEN RESULTS SUMMARY 13
18 INTRO EXP LH EXP CAEN RESULTS SUMMARY 14 Data collated for wave/wave + current to characterise changes in flow field around cylinders; PIV exp Velocity fields and free surface - for regular irregular waves Encouraging - flow structures observed: vortices, low KC; Observed structures associated to scour processes; Eddy presence not continuous -> Causes prelim. wave history Mobile bed exp Detailed regular intervals; point velocity, free surface Clear water scour regime S/D converges with time
19 Analysis and post-processing is on-going PIV and mobile bed Relate changes in bed and velocity responses Estimate of turbulent kinetic energy and bed shear stress from vertical velocity profiles Compare measured scour depth to empirical formulae and scour models Derive and implement parametrisation into models INTRO EXP LH EXP CAEN RESULTS SUMMARY 15
20 Associated Posters Ezersky et al. Laboratory modelling of resonant wave-current interaction in the vicinity of wind farrm masts. B45 Rivier et al. Assessment by regional modelling of the impact of monopile foundations on the on the hydrodynamics and sediment transport: case of Courseulles sur mer (France) wind farm. Y249 The OFELIA project was selected under the European cross-border cooperation programme INTERREG IV A France (Channel) - England, co-funded by the ERDF
21 2801 i no.18 Visualisation, video laser with high suspension Courseulles conditions re suspension up to mid depth 2801 il no il no.134 igarciahermosa@gmail.com INTRO EXP CAEN ANALYSIS RESULTS CONCLUSION
22 Particle Image Velocimetry (PIV) Synchronised laser and camera; Laser illuminates particles in area of interest at two consecutive instants (dt << 1 s); Camera captures two consecutive images (dt << 1 when laser is illuminating the field; Laser shutter opening open Aperture of camera shutter t dt Analysis - Pair of images Particle displacement Calibration (pixel to mm) - Particle velocity igarciahermosa@gmail.com INTRO EXP PIV ANALYSIS RESULTS CONCLUSION
23 INTRO EXP PIV ANALYSIS RESULTS CONCLUSION Field of view captured Extent of lase sheet Areas covered by the camera D D General view 1.4 cm d/d 3.2 cm 0.21 d/d 7.5 cm 0.5 d/d Large zoom zoom
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