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Journal Articles Energies Year : 2022

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

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Lu Wang
  • Function : Author
  • PersonId : 1140817
Jason Jonkman
  • Function : Author
  • PersonId : 1092736
Jang Kim
Zhi-Rong Shen
  • Function : Author
Arjen Koop
  • Function : Author
  • PersonId : 1125021
Adrià Borràs Nadal
  • Function : Author
  • PersonId : 1140819
Wei Shi
  • Function : Author
  • PersonId : 1140820
Xinmeng Zeng
Edward Ransley
Scott Brown
Martyn Hann
  • Function : Author
Pranav Chandramouli
  • Function : Author
  • PersonId : 1125022
Axelle Viré
Xiang Li
Qing Xiao
Sho Oh
Stefan Netzband
Hyunchul Jang
  • Function : Author
  • PersonId : 1125023
Kai Yu
  • Function : Author
  • PersonId : 1125024

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.
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Origin : Publication funded by an institution

Dates and versions

hal-03552625 , version 1 (02-02-2022)

Licence

Attribution - CC BY 4.0

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Cite

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, 2022, 15 (1), pp.389. ⟨10.3390/en15010389⟩. ⟨hal-03552625⟩

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