Numerical Approaches for Loads and Motions Assessment of Floating WECs Moored by Means of Catenary Mooring Systems
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2022
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Springer Science and Business Media B.V.
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Abstract
Technologies for harvesting offshore renewable energy based on floating platforms, such as offshore wind, wave and tidal energies, are currently being developed with the purpose of achieving a competitive cost of energy. The economic impact of the mooring system is significant within the total cost of such deployments, and large efforts are being carried out to optimize designs. Analysis of mooring systems at early stages generally require a trade-off between quick analysis methods and accuracy to carry out multi-variate sensitivity analyses. Even though the most accurate approaches are based on the non-linear finite element method in the time domain, these can result in being very time consuming. The most widely used numerical approaches for mooring line load estimates are introduced and discussed in this paper. It is verified that accurate line tension estimates require lines drag and inertia forces to be accounted for. A mooring and floating structure coupled model based on the lumped mass finite element approach is also discussed, and it is confirmed that the differences found in the coupled numerical model are mainly produced by the uncertainty on hydrodynamic force estimates on the floating structure rather than by the lumped mass method. In order to enable quick line tension estimates, a linearization of the structure and mooring coupled model is discussed. It shows accurate results in operational conditions and enables modal analysis of the coupled system.
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Publisher Copyright: © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.
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Affordable and clean energy (SDG7) , Catenary mooring , Multibody dynamics , Offshore renewable energy , Oscillating water column , Affordable and clean energy (SDG7) , Multibody dynamics , Catenary mooring , Offshore renewable energy , Oscillating water column , Mechanics of Materials , Mechanical Engineering , SDG 7 - Affordable and Clean Energy , Funding Info , This work was funded by Project IT949-16 (Departamento de Educación, Política Lingüística y Cultura, Regional). Government of the Basque Country. , This work was funded by Project IT949-16 (Departamento de Educación, Política Lingüística y Cultura, Regional). Government of the Basque Country.
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Touzon , I , Petuya , V , Nava , V , Alonso-Reig , M & Mendikoa , I 2022 , Numerical Approaches for Loads and Motions Assessment of Floating WECs Moored by Means of Catenary Mooring Systems . in G Quaglia , A Gasparetto , V Petuya & G Carbone (eds) , Proceedings of I4SDG Workshop 2021 - IFToMM for Sustainable Development Goals . vol. 108 , Mechanisms and Machine Science , vol. 108 MMS , Springer Science and Business Media B.V. , pp. 59-69 , 1st Workshop IFToMM for Sustainable Development Goals, I4SDG 2021 , Virtual, Online , 25/11/21 . https://doi.org/10.1007/978-3-030-87383-7_7
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