Numerical modelling of dynamic responses of a floating offshore wind turbine subject to focused waves

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Zhou, Yang and Xiao, Qing and Liu, Yuanchuan and Incecik, Atilla and Peyrard, Christophe and Li, Sunwei and Pan, Guang (2019) Numerical modelling of dynamic responses of a floating offshore wind turbine subject to focused waves. Energies, 12 (18). 3482. ISSN 1996-1073 (https://doi.org/10.3390/en12183482)

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Abstract

In this paper, we present numerical modelling for the investigation of dynamic responses of a floating offshore wind turbine subject to focused waves. The modelling was carried out using a Computational Fluid Dynamics (CFD) tool. We started with the generation of a focused wave in a numerical wave tank based on a first-order irregular wave theory, then validated the developed numerical method for wave-structure interaction via a study of floating production storage and offloading (FPSO) to focused wave. Subsequently, we investigated the wave-/wind-structure interaction of a fixed semi-submersible platform, a floating semi-submersible platform and a parked National Renewable Energy Laboratory (NREL) 5 MW floating offshore wind turbine. To understand the nonlinear effect, which usually occurs under severe sea states, we carried out a systematic study of the motion responses, hydrodynamic and mooring tension loads of floating offshore wind turbine (FOWT) over a range of wave steepness, and compared the results obtained from two potential flow theory tools with each other, i.e., Électricité de France (EDF) in-house code and NREL Fatigue, Aerodynamics, Structures, and Turbulence (FAST). We found that the nonlinearity of the hydrodynamic loading and motion responses increase with wave steepness, revealed by higher-order frequency response, leading to the appearance of discrepancies among different tools.

ORCID iDs

Zhou, Yang, Xiao, Qing ORCID logoORCID: https://orcid.org/0000-0001-8512-5299, Liu, Yuanchuan, Incecik, Atilla, Peyrard, Christophe, Li, Sunwei and Pan, Guang;
CORE (COnnecting REpositories)