Posters - WindEurope Annual Event 2024

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We would like to invite you to come and see the posters at our upcoming conference. The posters will showcase a diverse range of research topics, and will give delegates an opportunity to engage with the authors and learn more about their work. Whether you are a seasoned researcher or simply curious about the latest developments in your field, we believe that the posters will offer something of interest to everyone. So please join us at the conference and take advantage of this opportunity to learn and engage with your peers in the academic community. We look forward to seeing you there!

PO106: An engineering method to assess extreme breaking wave loads in design of floating offshore wind turbines

Jean Francois Filipot, Scientific Director, France Energies Marines


Although extreme wave loads on bottom-fixed offshore wind turbines (BOWT) have been widely studied over the past 20 years, there is limited guidance when it comes to breaking wave loads in design of floating offshore wind turbines (FOWT). This represents an important gap for the industry since extreme wave loads on FOWTs and BOWTs may differ significantly due to differences in water depth that influence wave dynamics and in the wave-structure interactions due to the FOWT motion. This work addresses this lack of knowledge and guidance and presents a specific methodology to account for extreme wave loads including breaking-wave induced slamming loads in the design of FOWT. The work relies on the following major results obtained in the frame of the collaborative DIMPACT project : 1) A new approach to define the design sea states from a response-based design approach. It relies on the assessment of the hydrodynamic load magnitude associated with a given wave, using its severity, extending the results from Derakhthi et al. (2018). 2) FOWT-specific engineering formula derived in the DIMPACT project (Renaud & al. 2023a,b), refining the classical engineering hydrodynamic loads formula and incorporating the effect of FOWT-specific parameters (tilt and motion of the floater) on the effects of breaking and non-breaking wave loads. 3) The implementation in aero-hydro-servo-elastic solvers (DIEGO & OpenFAST) of a novel method to assess extreme wave loads from the knowledge of the linear wave properties only. The above results were derived and validated using flume tank experiments conducted at Ifremer (Hulin et al. 2022), featuring impact of a variety of breaking waves on a cylinder equipped with load cells and mounted on an hexapod able to reproduce tilt and motions similar to those experienced by FOWT. Further numerical investigations with a CFD solver (Batlle & al., 2023), complete the project results.

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