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Experimental Study on the Hydrodynamic Analysis of a Floating Offshore Wind Turbine Under Focused Wave Conditions.

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Title: Experimental Study on the Hydrodynamic Analysis of a Floating Offshore Wind Turbine Under Focused Wave Conditions.
Authors: Zhai, Hanbo1 (AUTHOR), Yan, Chaojun2 (AUTHOR), Shi, Wei2,3 (AUTHOR), Zhang, Lixian3,4 (AUTHOR), Zeng, Xinmeng4,5 (AUTHOR), Han, Xu1,2 (AUTHOR) xu.han@dlut.edu.cn, Michailides, Constantine2,5 (AUTHOR)
Source: Energies (19961073). Aug2025, Vol. 18 Issue 15, p4140. 20p.
Subjects: Hydrodynamics, Water waves, Ocean waves, Aquatic resources, Mooring of ships, Wind power
Abstract: The strong nonlinearity of shallow-water waves significantly affects the dynamic response of floating offshore wind turbines (FOWTs), introducing additional complexity in motion behavior. This study presents a series of 1:80-scale experiments conducted on a 5 MW FOWT at a 50 m water depth, under regular, irregular, and focused wave conditions. The tests were conducted under regular, irregular, and focused wave conditions. The results show that, under both regular and irregular wave conditions, the platform's motion and mooring tension increased as the wave period became longer, indicating a greater energy transfer and stronger coupling effects at lower wave frequencies. Specifically, in irregular seas, mooring tension increased by 16% between moderate and high sea states, with pronounced surge–pitch coupling near the natural frequency. Under focused wave conditions, the platform experienced significant surge displacement due to the impact of large wave crests, followed by free-decay behavior. Meanwhile, the pitch amplitude increased by up to 27%, and mooring line tension rose by 16% as the wave steepness intensified. These findings provide valuable insights for the design and optimization of FOWTs in complex marine environments, particularly under extreme wave conditions. Additionally, they contribute to the refinement of relevant numerical simulation methods. [ABSTRACT FROM AUTHOR]
Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Experimental Study on the Hydrodynamic Analysis of a Floating Offshore Wind Turbine Under Focused Wave Conditions.
– Name: Author
  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Zhai%2C+Hanbo%22">Zhai, Hanbo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yan%2C+Chaojun%22">Yan, Chaojun</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shi%2C+Wei%22">Shi, Wei</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Lixian%22">Zhang, Lixian</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zeng%2C+Xinmeng%22">Zeng, Xinmeng</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Han%2C+Xu%22">Han, Xu</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> xu.han@dlut.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Michailides%2C+Constantine%22">Michailides, Constantine</searchLink><relatesTo>2,5</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Aug2025, Vol. 18 Issue 15, p4140. 20p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Hydrodynamics%22">Hydrodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Water+waves%22">Water waves</searchLink><br /><searchLink fieldCode="DE" term="%22Ocean+waves%22">Ocean waves</searchLink><br /><searchLink fieldCode="DE" term="%22Aquatic+resources%22">Aquatic resources</searchLink><br /><searchLink fieldCode="DE" term="%22Mooring+of+ships%22">Mooring of ships</searchLink><br /><searchLink fieldCode="DE" term="%22Wind+power%22">Wind power</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The strong nonlinearity of shallow-water waves significantly affects the dynamic response of floating offshore wind turbines (FOWTs), introducing additional complexity in motion behavior. This study presents a series of 1:80-scale experiments conducted on a 5 MW FOWT at a 50 m water depth, under regular, irregular, and focused wave conditions. The tests were conducted under regular, irregular, and focused wave conditions. The results show that, under both regular and irregular wave conditions, the platform's motion and mooring tension increased as the wave period became longer, indicating a greater energy transfer and stronger coupling effects at lower wave frequencies. Specifically, in irregular seas, mooring tension increased by 16% between moderate and high sea states, with pronounced surge–pitch coupling near the natural frequency. Under focused wave conditions, the platform experienced significant surge displacement due to the impact of large wave crests, followed by free-decay behavior. Meanwhile, the pitch amplitude increased by up to 27%, and mooring line tension rose by 16% as the wave steepness intensified. These findings provide valuable insights for the design and optimization of FOWTs in complex marine environments, particularly under extreme wave conditions. Additionally, they contribute to the refinement of relevant numerical simulation methods. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/en18154140
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        Text: English
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        PageCount: 20
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      – SubjectFull: Hydrodynamics
        Type: general
      – SubjectFull: Water waves
        Type: general
      – SubjectFull: Ocean waves
        Type: general
      – SubjectFull: Aquatic resources
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      – SubjectFull: Mooring of ships
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      – SubjectFull: Wind power
        Type: general
    Titles:
      – TitleFull: Experimental Study on the Hydrodynamic Analysis of a Floating Offshore Wind Turbine Under Focused Wave Conditions.
        Type: main
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          Name:
            NameFull: Zhai, Hanbo
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            NameFull: Yan, Chaojun
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            NameFull: Shi, Wei
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            NameFull: Zeng, Xinmeng
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            NameFull: Han, Xu
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            – D: 01
              M: 08
              Text: Aug2025
              Type: published
              Y: 2025
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