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Special Section Articles

Aero-Hydro-Elastic Simulation of a Semi-Submersible Floating Wind Turbine

[+] Author and Article Information
Maxime Philippe

LHEEA Lab. (ECN-CNRS),
École Centrale Nantes,
LUNAM Université,
Nantes 44321, France
e-mail: maxime.philippe@ec-nantes.fr

Aurélien Babarit

LHEEA Lab. (ECN-CNRS),
École Centrale Nantes,
LUNAM Université,
Nantes 44321, France
e-mail: aurelien.babarit@ec-nantes.fr

Pierre Ferrant

LHEEA Lab. (ECN-CNRS),
École Centrale Nantes,
LUNAM Université,
Nantes 44321, France
e-mail: pierre.ferrant@ec-nantes.fr

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received January 15, 2013; final manuscript received May 8, 2013; published online March 24, 2014. Assoc. Editor: Krish Thiagarajan.

J. Offshore Mech. Arct. Eng 136(2), 020908 (Mar 24, 2014) (8 pages) Paper No: OMAE-13-1006; doi: 10.1115/1.4025031 History: Received January 15, 2013; Revised May 08, 2013

This paper presents an aero-hydro-elastic model of a semi-submersible floating wind turbine. A specific attention is drawn to hydrodynamic modeling options and their effect on the dynamic response of the platform. The NREL 5 MW reference wind turbine mounted on the historical concept of semi-submersible platform Dutch tri-floater is considered. A specific hydrodynamic model of loads on a semi-submersible platform is used within the wind turbine design code FAST from NREL. This hydrodynamic model includes nonlinear hydrostatic and Froude-Krylov forces, diffraction/radiation forces obtained from linear potential theory, and Morison forces to take into account viscous effects on the braces and damping plates. The effect of the different hydrodynamic modeling options is investigated. As one could have expected, it is found that the effect of viscous drag on braces, and nonlinear Froude-Krylov loads, becomes larger with increasing wave height. Their effect remains of small order. Simulations also are run with directional waves, it is found that wave directionality induces larger transverse motions.

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Figures

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Fig. 1

Directional wave spectrum for γ = 1 (Pierson-Moskowitz) and s = 40

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Fig. 2

Simulation of the Dutch tri-floater in irregular directional waves

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Fig. 3

(a) View of the platform, (b) mesh of the braces for Morison drag loads calculation, (c) mesh of Dutch tri-floater platform used with Aquaplus for potential flow calculation, and (d) mesh used for nonlinear Froude-Krylov loads calculation

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Fig. 4

Picture of the mooring system modeling with OrcaFlex [23]

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Fig. 11

Comparison of tower base moment for the case of irregular unidirectional and directional waves

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Fig. 10

Comparison of pitch and yaw motions in irregular directional waves and unidirectional waves

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Fig. 9

Wave elevation for irregular directional waves and unidirectional waves

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Fig. 8

Amplitude of pitch motion and tower base pitching moment around a mean value with regards to wave amplitude for an incident wave of pulsation ω = 0.6 rad s−1

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Fig. 7

Amplitude of pitch motion and tower base pitching moment around a mean value with regards to wave amplitude for an incident wave of pulsation ω = 1 rad s−1

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Fig. 6

Effective RAOs of the tower top deflection and out of plane blade tip deflection

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Fig. 5

Effective RAOs of the platform surge, heave, pitch, and yaw motions

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