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Numerical and experimental investigation of the dynamic responses of an integrated semi-submersible floating wind-wave energy converter

Lookup NU author(s): Dr Yongchang Pu, Professor Zhiqiang HuORCiD

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Abstract

© 2025 Elsevier LtdThis paper introduces an integrated floating wind-wave energy conversion system, with a heave-type WEC attached to a semi-submersible braceless wind turbine's central column. Numerical simulations and a 1/80 scale physical model test were used to evaluate its dynamic responses under combined wind and wave conditions. Free decay tests confirmed the numerical model's accuracy in predicting the platform's natural periods for surge, heave, and pitch motions, with errors under 5 %. In regular waves, numerical and experimental results for motion responses and mooring tensions were highly consistent, with maximum errors not exceeding 15 %. Under irregular waves, the maximum errors in motion responses and mooring tensions were within 19 %. In combined wind-wave conditions, except for pitch motion, the maximum errors in other responses were no more than 20 %. In high wind speed combined wind-wave conditions (23.8 m/s), the pitch error reached 40.52 %. The findings confirm the reliability of the proposed integrated system design and underscore the importance of considering the coupled effects of wind and waves on the system's dynamic response, providing valuable insights for the design and optimization of offshore renewable energy systems.

Publication metadata

Author(s): Shi W, Cao L, Li J, Wan L, Pu Y, Hu Z, Michailides C, Ding B, Zhao H

Publication type: Article

Publication status: Published

Journal: Ocean Engineering

Year: 2025

Volume: 332

Print publication date: 15/07/2025

Online publication date: 03/05/2025

Acceptance date: 29/04/2025

ISSN (print): 0029-8018

ISSN (electronic): 1873-5258

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.oceaneng.2025.121427

DOI: 10.1016/j.oceaneng.2025.121427

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