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A CFD Study of Vortex-Induced Motions of a Semi-Submersible Floating Offshore Wind Turbine

Author

Listed:
  • Yuanchuan Liu

    (College of Engineering, Ocean University of China, Qingdao 266400, China)

  • Dunjie Ge

    (College of Engineering, Ocean University of China, Qingdao 266400, China)

  • Xinglan Bai

    (School of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan 316022, China)

  • Liang Li

    (College of Engineering, Ocean University of China, Qingdao 266400, China
    Shandong Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao 266400, China)

Abstract

Vortex-induced motion (VIM) is a critical issue for floating structures made of one or more columns, due to its significant impacts on their operational stability. Supported by column-type floating platforms, floating offshore wind turbines (FOWTs) may also experience large-amplitude VIM responses in current flow. Existing research on FOWTs has mostly focused on their wind/wave induced responses, yet less attention has been paid to their responses in current flow. In this paper, the VIM of the OC4 semi-submersible FOWT platform is studied numerically over a wide range of flow velocity. Three incidence angles, i.e., 0°, 90°, and 180°, are considered and the effect of current incidence on platform VIM is analysed. Results show that the so-called lock-in phenomenon is present and that a large transverse response amplitude of more than 0.3 D persists until V r = 30, with its maximum reaching over 0.8 D at V r = 8. Meanwhile, the transverse response amplitude for cases with the incidence angle of 180° is generally smaller, with a narrower lock-in regime, than those under the other two incidence scenarios. Flow field visualisation reveals that upstream vortices continuously interact with the downstream side column when the incidence angle turns to 180°, impacting the vortex shedding process and consequently fluid forces of the downstream column.

Suggested Citation

  • Yuanchuan Liu & Dunjie Ge & Xinglan Bai & Liang Li, 2023. "A CFD Study of Vortex-Induced Motions of a Semi-Submersible Floating Offshore Wind Turbine," Energies, MDPI, vol. 16(2), pages 1-27, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:2:p:698-:d:1028003
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    References listed on IDEAS

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    1. Chen, Ziwen & Wang, Xiaodong & Guo, Yize & Kang, Shun, 2021. "Numerical analysis of unsteady aerodynamic performance of floating offshore wind turbine under platform surge and pitch motions," Renewable Energy, Elsevier, vol. 163(C), pages 1849-1870.
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