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OC6 Phase Ia: CFD Simulations of the Free-Decay Motion of the DeepCwind Semisubmersible

Lu Wang 1 Amy Robertson 1 Jason Jonkman 1 Jang Kim 2 Zhi-Rong Shen 2 Arjen Koop 3 Adrià Borràs Nadal 4 Wei Shi 5 Xinmeng Zeng 5 Edward Ransley 6 Scott Brown 6 Martyn Hann 6 Pranav Chandramouli 7 Axelle Viré 7 Likhitha Ramesh Reddy 7 Xiang Li 8 Qing Xiao 8 Beatriz Méndez López 9 Guillén Campaña Alonso 9 Sho Oh 10 Hamid Sarlak 11 Stefan Netzband 12 Hyunchul Jang 13 Kai Yu 14
1 NREL - National Renewable Energy Laboratory
2 Front Energies
3 MARIN - Maritime Research Institute Netherlands
4 IFPEN - IFP Energies nouvelles
5 Dalian University of Technology
6 Plymouth University
7 Faculty of Aerospace Engineering [Delft]
8 University of Strathclyde [Glasgow]
9 CENER - Centro Nacional de Energías Renovables - Fundación CENER-CIEMAT
10 Nippon Kaiji Kyokai
11 DTU - Technical University of Denmark [Lyngby]
12 TUHH - Hamburg University of Technology
13 TECHNIP Energies
14 American Bureau of Shipping
Abstract : Currently, the design of floating offshore wind systems is primarily based on mid-fidelity models with empirical drag forces. The tuning of the model coefficients requires data from either experiments or high-fidelity simulations. As part of the OC6 (Offshore Code Comparison Collaboration, Continued, with Correlation, and unCertainty (OC6) is a project under the International Energy Agency Wind Task 30 framework) project, the present investigation explores the latter option. A verification and validation study of computational fluid dynamics (CFD) models of the DeepCwind semisubmersible undergoing free-decay motion is performed. Several institutions provided CFD results for validation against the OC6 experimental campaign. The objective is to evaluate whether the CFD setups of the participants can provide valid estimates of the hydrodynamic damping coefficients needed by mid-fidelity models. The linear and quadratic damping coefficients and the equivalent damping ratio are chosen as metrics for validation. Large numerical uncertainties are estimated for the linear and quadratic damping coefficients; however, the equivalent damping ratios are more consistently predicted with lower uncertainty. Some difference is observed between the experimental and CFD surge-decay motion, which is caused by mechanical damping not considered in the simulations that likely originated from the mooring setup, including a Coulomb-friction-type force. Overall, the simulations and the experiment show reasonable agreement, thus demonstrating the feasibility of using CFD simulations to tune mid-fidelity models.
Keywords : CFD Validation Free Decay Offshore Wind Semisubmersible Uncertainty OC6 IEA
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Submitted on : Wednesday, February 2, 2022 - 1:14:20 PM
Last modification on : Tuesday, February 8, 2022 - 3:07:44 AM
Long-term archiving on: : Tuesday, May 3, 2022 - 7:01:43 PM

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Lu Wang, Amy Robertson, Jason Jonkman, Jang Kim, Zhi-Rong Shen, et al.. OC6 Phase Ia: CFD Simulations of the Free-Decay Motion of the DeepCwind Semisubmersible. Energies, MDPI, 2022, 15 (1), pp.389. ⟨10.3390/en15010389⟩. ⟨hal-03552625⟩

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