OC6 Phase Ia : CFD simulations of the free-decay motion of the DeepCwind semisubmersible

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Wang, Lu and Robertson, Amy and Jonkman, Jason and Kim, Jang and Shen, Zhi-Rong and Koop, Arjen and Borràs Nadal, Adrià and Shi, Wei and Zeng, Xinmeng and Ransley, Edward and Brown, Scott and Hann, Martyn and Chandramouli, Pranav and Viré, Axelle and Ramesh Reddy, Likhitha and Li, Xiang and Xiao, Qing and Méndez López, Beatriz and Campaña Alonso, Guillén and Oh, Sho and Sarlak, Hamid and Netzband, Stefan and Jang, Hyunchul and Yu, Kai (2022) OC6 Phase Ia : CFD simulations of the free-decay motion of the DeepCwind semisubmersible. Energies, 15 (1). 389. ISSN 1996-1073 (https://doi.org/10.3390/en15010389)

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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.

ORCID iDs

Wang, Lu, Robertson, Amy, Jonkman, Jason, Kim, Jang, Shen, Zhi-Rong, Koop, Arjen, Borràs Nadal, Adrià, Shi, Wei, Zeng, Xinmeng, Ransley, Edward, Brown, Scott, Hann, Martyn, Chandramouli, Pranav, Viré, Axelle, Ramesh Reddy, Likhitha, Li, Xiang, Xiao, Qing ORCID logoORCID: https://orcid.org/0000-0001-8512-5299, Méndez López, Beatriz, Campaña Alonso, Guillén, Oh, Sho, Sarlak, Hamid, Netzband, Stefan, Jang, Hyunchul and Yu, Kai;
CORE (COnnecting REpositories)