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

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

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    Abstract

    In this paper, we present a numerical modelling work on the investigation of dynamic responses of a floating offshore wind turbine subject to focused waves. The modelling is carried out by using a Computational Fluid Dynamics (CFD) tool. We start with the generation of a focused wave in a numerical wave tank based on a first-order irregular wave theory, then validate the developed numerical method for wave-structure interaction via a study of a floating production storage and offloading (FPSO) to focused wave. Subsequently, we investigate wave-/wind-structure interaction of a fixed semi-submersible platform, a floating semi-submersible platform and a parked National Renewable Energy Laboratory (NREL) 5MW floating offshore wind turbine. To understand the nonlinear effect, which usually occurs under severe sea states, we carry out a systematic study on the motion responses, hydrodynamic and mooring tension loads of floating offshore wind turbine (FOWT) over a range of wave steepness, and compare 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 find 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.