Comparative design space exploration of centred and off-centred semisubmersible configurations for floating offshore wind turbines

Claudio A. Rodríguez Castillo*, Maurizio Collu, Feargal Brennan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Achieving net-zero carbon goals demands an accelerated energy transition, with offshore wind energy emerging as a key contributor due to its vast potential. While floating offshore wind turbines (FOWTs) have seen significant progress through demonstrators, scaling up turbine capacities and deploying large-scale wind farms require further research and innovation. This study explores the design trade-offs between centred and off-centred semisubmersible configurations in FOWTs, using the UMaine and WindFloat designs as base for representative case studies. Parametric analyses were conducted to evaluate key aspects such as dimensioning, mass properties, equilibrium, intact stability, natural periods, and wave-induced loads, applied to the 15-MW IEA reference wind turbine at Scotland's NE8 offshore site. The findings reveal that off-centred semisubmersible configurations face significant challenges due to stringent ballast distribution constraints, which restrict the feasible design space. Conversely, centred semisubmersible configurations demonstrated better overall performance across key design metrics, achieving these outcomes with notably less hull steel mass. These results highlight the critical influence of tower placement on floating substructure design, emphasising the importance of refining and optimising proven configurations to support the development of efficient, large-scale floating wind energy systems.
Original languageEnglish
Article number120740
Number of pages14
JournalOcean Engineering
Volume324
Early online date22 Feb 2025
DOIs
Publication statusE-pub ahead of print - 22 Feb 2025

Funding

This work was funded by the UK Engineering and Physical Sciences Research Council (EPSRC) as part of the Ocean-REFuel (Ocean Renewable Energy Fuels) Programme Grant EP/W005212/1 awarded to the University of Strathclyde, Newcastle University, University of Nottingham, Cardiff University, and Imperial College London.

Keywords

  • floating substructure
  • floating platform
  • hull optimisation
  • ocean renewable energy
  • marine hydrodynamics

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