Publisher DOI: 10.1016/j.oceaneng.2021.110026
Title: OC6 Phase Ib: Validation of the CFD predictions of difference-frequency wave excitation on a FOWT semisubmersible
Language: English
Authors: Wang, Lu 
Robertson, Amy 
Jonkman, Jason 
Yu, Yi Hsiang 
Koop, Arjen 
Borràs Nadal, Adrià 
Li, Haoran 
Bachynski, Erin E. 
Pinguet, Romain 
Shi, Wei 
Zeng, Xinmeng 
Zhou, Yang 
Xiao, Qing 
Kumar, Rupesh 
Sarlak, Hamid 
Ransley, Edward 
Brown, Scott 
Hann, Martyn 
Netzband, Stefan 
Wermbter, Malwin 
Méndez López, Beatriz 
Keywords: Bichromatic wave;CFD;Nonlinear excitation;OC6;Offshore wind;Validation
Issue Date: 1-Dec-2021
Source: Ocean Engineering 241: 110026 (2021-12-01)
Journal: Ocean engineering 
Abstract (english): 
During the previous OC511 project, state-of-the-art mid-fidelity engineering tools for floating wind systems were found to consistently underpredict the nonlinear, low-frequency responses of semisubmersible offshore wind platforms, leading to substantial errors in the structural loads because of low-frequency surge and pitch resonance. To examine this underprediction, a coordinated investigation with computational fluid dynamics (CFD) simulations and model-basin experiments was carried out. Both investigations involved a fixed and simplified OC5-DeepCwind semisubmersible in bichromatic waves. The wave excitations—especially the nonlinear, difference-frequency excitation—on the structure from the CFD simulations were compared to the experimental measurements for validation, with uncertainty analyses for both the experimental and the CFD results. Further, the wave excitations on each column of the semisubmersible were measured separately in the experiment, allowing the validation of the CFD results to be done on a per-column basis. Overall, the CFD predictions of the difference-frequency excitations agree with the experimental measurements, suggesting the CFD solutions can be used as a reference for tuning and improving the engineering-level tools and can provide a means to better understand the underprediction at low frequencies.
ISSN: 0029-8018
Institute: Fluiddynamik und Schiffstheorie M-8 
Document Type: Article
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