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Wave- and drag-driven subharmonic responses of a floating wind turbine

Published online by Cambridge University Press:  27 October 2021

Jana Orszaghova Open the ORCID record for Jana Orszaghova [Opens in a new window] ,
Paul H. Taylor ,
Hugh A. Wolgamot Open the ORCID record for Hugh A. Wolgamot [Opens in a new window] ,
Freddy J. Madsen ,
Antonio M. Pegalajar-Jurado Open the ORCID record for Antonio M. Pegalajar-Jurado [Opens in a new window]  and
Henrik Bredmose Open the ORCID record for Henrik Bredmose [Opens in a new window]
Jana Orszaghova*
Affiliation:
Oceans Graduate School and Wave Energy Research Centre, University of Western Australia,WA 6009, Australia
Paul H. Taylor
Affiliation:
Oceans Graduate School and Wave Energy Research Centre, University of Western Australia,WA 6009, Australia
Hugh A. Wolgamot
Affiliation:
Oceans Graduate School and Wave Energy Research Centre, University of Western Australia,WA 6009, Australia
Freddy J. Madsen
Affiliation:
Department of Wind Energy, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark
Antonio M. Pegalajar-Jurado
Affiliation:
Department of Wind Energy, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark
Henrik Bredmose
Affiliation:
Department of Wind Energy, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark
*
†Email address for correspondence: jana.orszaghova@uwa.edu.au
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Abstract

The nonlinear hydrodynamic responses of a novel spar-type soft-moored floating offshore wind turbine are investigated via analysis of motion measurements from a wave-basin campaign. A prototype of the TetraSpar floater, supporting a $1:60$ scale model of the DTU 10 MW reference wind turbine, was subjected to irregular wave forcing (with no wind) and shown to exhibit subharmonic resonant motions, which greatly exceeded the wave-frequency motions. These slow-drift responses are excited nonlinearly, since the rigid-body natural frequencies of the system lie below the incident-wave frequency range. Pitch motion is examined in detail, allowing for identification of different hydrodynamic forcing mechanisms. The resonant response is found to contain odd-harmonic components, in addition to the even harmonics expected a priori and excited by second-order difference-frequency hydrodynamic interactions. Data analysis utilising harmonic separation and signal conditioning suggests that Morison drag excitation or third-order subharmonic potential flow forcing could be at play. In the extreme survival-conditions sea state, the odd resonant responses are identified to be drag-driven. Their importance for the tested floater is appreciable, as their magnitude is comparable to the second-order potential flow effects. Under such severe conditions, the turbine would not be operating, and as such neglecting aerodynamic forcing and motion damping is likely to be reasonable. Additionally, other possible drivers of the resonant pitch response are explored. Both Mathieu-type parametric excitation and wavemaker-driven second-order error waves are found to have negligible influence. However, we note slight contamination of the measurements arising from wave-basin sloshing.

JFM classification

Waves/Free-surface Flows: Surface gravity waves

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JFM Papers
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Journal of Fluid Mechanics , Volume 929 , 25 December 2021 , A32
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© The Author(s), 2021. Published by Cambridge University Press

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References

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