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Research Papers: Ocean Renewable Energy

Influence of Vortex-Induced Loads on the Motion of SPAR-Type Wind Turbine: A Coupled Aero-Hydro-Vortex-Mooring Investigation

[+] Author and Article Information
Yan Li

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300072, China;
Department of Structural Engineering,
University of California, San Diego
La Jolla, CA 92093;
Collaborative Innovation Center for Advanced
Ship and Deep-Sea Exploration,
Shanghai 200240, China
e-mail: liyan_0323@tju.edu.cn

Liqin Liu

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300072, China
e-mail: liuliqin@tju.edu.cn

Qiang Zhu

Department of Structural Engineering,
University of California, San Diego,
La Jolla, CA 92093
e-mail: qizhu@ucsd.edu

Ying Guo

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300072, China
e-mail: yynocry@tju.edu.cn

Zhiqiang Hu

School of Engineering,
Newcastle University,
Newcastle upon Tyne NE1 7RU, UK
e-mail: zhiqiang.hu@ncl.ac.uk

Yougang Tang

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300072, China
e-mail: tangyougang_td@163.com

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 October 10, 2017; final manuscript received April 8, 2018; published online May 21, 2018. Assoc. Editor: Qing Xiao.

J. Offshore Mech. Arct. Eng 140(5), 051903 (May 21, 2018) (13 pages) Paper No: OMAE-17-1185; doi: 10.1115/1.4040048 History: Received October 10, 2017; Revised April 08, 2018

The nonlinear coupling effect between degree-of-freedom (DOFs) and the influence of vortex-induced loads on the motion of SPAR-type floating offshore wind turbine (FOWT) are studied based on an aero-hydro-vortex-mooring coupled model. Both the first- and second-order wave loads are calculated based on the three-dimensional (3D) potential theory. The aerodynamic loads on the rotor are acquired with the blade element momentum (BEM) theory. The vortex-induced loads are simulated with computational fluid dynamics (CFD) approach. The mooring forces are solved by the catenary theory and the nonlinear stiffness provided by the SPAR buoy is also considered. The coupled model is set up and a numerical code is developed for calculating the dynamic response of a Hywind SPAR-type FOWT under the combined sea states of wind, wave, and current. It shows that the amplitudes of sway and roll are dominated by lift loads induced by vortex shedding, and the oscillations in roll reach the same level of pitch in some scenarios. The mean value of surge is changed under the drag loads, but the mean position in pitch, as well as the oscillations in surge and pitch, is little affected by the current. Due to the coupling effects, the heave motion is also influenced by vortex-induced forces. When vortex-shedding frequency is close to the natural frequency in roll, the motions are increased. Due to nonlinear stiffness, super-harmonic response occurs in heave, which may lead to internal resonance.

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Figures

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Fig. 1

Definition of the physical problem

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Fig. 6

Hydrodynamic coefficients and vortex-shedding frequency of SPAR buoy

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Fig. 5

Mesh of the flow area

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Fig. 8

Trajectory of VIMs: (a) Uc = 0.4 m/s, (b) Uc = 0.6 m/s, (c) Uc = 0.8 m/s, (d) Uc = 1.0 m/s, (e) Uc = 1.2 m/s, and (f) Uc = 1.5 m/s

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Fig. 3

Validation of the aerodynamic model

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Fig. 7

Coupling effects in free-decay tests

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Fig. 9

Statistic results of motions and mooring tensions

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Fig. 10

Time histories and response spectra of sway and lift force

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Fig. 11

Time histories and response spectra of roll and lift moment

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Fig. 12

Time histories and response spectra of surge and drag force

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Fig. 15

Time histories and response spectrum of heave

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Fig. 16

Time histories and response spectrum of tension in line #2

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Fig. 17

Resonance in roll and nonlinear coupling effect in heave

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Fig. 13

Time histories and response spectra of pitch and drag moment

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Fig. 14

Magitude of drag and wave loads on the platform in LC3

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