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Hydrodynamic performance of a multi-float pendulum wave energy converter coupled with a monopile wind turbine

Author

Listed:
  • Jin, Yeqing
  • Chen, Zichuan
  • Ren, Guangyan
  • Zhang, Tianhao
  • Zhang, Jianbo
  • Zou, Guoqiang

Abstract

To enhance the energy yield per unit area of an offshore monopile wind turbine, this paper introduces a novel approach by integrating a pendulum wave energy converter with a monopile wind turbine. This integration is achieved through a hinged circumferential array, creating a multi-floating pendulum wave energy converters (MFP-WECs). A three-dimensional numerical tank was constructed using the dynamic mesh technology in STAR-CCM + software. By replacing the mechanical power take-off (PTO) system with a damping coefficient equivalent, a numerical computational model for hydrodynamic and power generation performance prediction of damping-containing multi-float hinged systems is developed to investigate the hydrodynamic performance and energy capture characteristics of MFP-WECs. In addition, a 1:40 scaled-down model of MFP-WECs is developed. Hydrodynamic and power generation experimental studies are conducted using a wave-making tank. Comparison between numerical and experimental results for the MPF-WECs scale model demonstrates maximum errors of approximately 4.21 % in RAO and 4.60 % in power output, verifying the validity of the numerical model presented in this study. Based on this, the study explores the effects of single-float geometric parameters, pendulum arm parameters, PTO damping parameters, and multi-float interactions on the hydrodynamic performance and power generation characteristics of the system. The results show that the RAO and power output of MPF-WECs first increase and then decrease with wave period, while increasing with wave height. Under the specific wave periods and heights, MPF-WECs have an optimal diameter, draft, and equivalent damping coefficient. The maximum capture width ratio of MPF-WECs is approximately 21.17 %. The circumferentially uniform six-buoy configuration exhibits good wave-following capability. However, due to hydrodynamic interference, the actual total power output of the six-float array shows a reduction ratio of about 0.7026 compared to the theoretical sum of six isolated floats. This value provides data guidance for engineering design.

Suggested Citation

  • Jin, Yeqing & Chen, Zichuan & Ren, Guangyan & Zhang, Tianhao & Zhang, Jianbo & Zou, Guoqiang, 2025. "Hydrodynamic performance of a multi-float pendulum wave energy converter coupled with a monopile wind turbine," Energy, Elsevier, vol. 341(C).
    • Handle: RePEc:eee:energy:v:341:y:2025:i:c:s0360544225049990
    DOI: 10.1016/j.energy.2025.139357
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