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Lookup NU author(s): Professor Zhiqiang Hu
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
In this paper, the dynamic responses of a Spar-type floating offshore wind turbine (FOWT) are simulated andanalyzed under the scenarios with freak wave superimposed a uniform current. The wave-current interaction isconsidered in the process of freak wave generation. An improved phase modulation algorithm is used to generatethe free surface profile of the freak wave. Compared with the deterministic wave modeling method, this methodcan realize the randomness of the sea state and also achieve high efficiency. The effect of the presence of currenton the wave energy spectra is firstly investigated. Then the OC3 Hywind Spar-type FOWT in the parked conditionis chosen as an example to study the dynamic responses under the extreme wave scenarios. An in-houseMATLAB code based on a nonlinear aero-hydro-mooring coupled model is adopted to perform these numericalinvestigations. The simulations are conducted in the time domain and then the results of wave forces andplatform motions in the surge, heave and pitch are summarized and analyzed considering the presence of currentwith different velocities. The results of mooring lines tension and the acceleration at nacelle are also investigated.Through the simulation results, we can have a clear understanding of the mechanism of the wavecurrentinteraction phenomenon for extremely high waves in Gaussian seas. Furthermore, it also allows identifyingthe severest wave conditions which are important for the analysis of the floating structure ultimate designconditions
Author(s): Qu X, Li Y, Tang Y, Hu Z, Zhang P, Yin T
Publication type: Article
Publication status: Published
Journal: Applied Ocean Research
Year: 2020
Volume: 100
Print publication date: 01/07/2020
Online publication date: 15/05/2020
Acceptance date: 20/04/2020
Date deposited: 15/05/2020
ISSN (print): 0141-1187
ISSN (electronic): 1879-1549
Publisher: Elsevier Ltd
URL: https://doi.org/10.1016/j.apor.2020.102178
DOI: 10.1016/j.apor.2020.102178
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