%0 Journal Article %T OC6 Phase Ia: CFD Simulations of the Free-Decay Motion of the DeepCwind Semisubmersible %+ National Renewable Energy Laboratory (NREL) %+ Front Energies %+ Maritime Research Institute Netherlands (MARIN) %+ IFP Energies nouvelles (IFPEN) %+ Dalian University of Technology %+ Plymouth University %+ Faculty of Aerospace Engineering [Delft] %+ University of Strathclyde [Glasgow] %+ Centro Nacional de Energías Renovables - Fundación CENER-CIEMAT (CENER) %+ Nippon Kaiji Kyokai %+ Danmarks Tekniske Universitet = Technical University of Denmark (DTU) %+ Hamburg University of Technology (TUHH) %+ TECHNIP Energies %+ American Bureau of Shipping %A Wang, Lu %A Robertson, Amy %A Jonkman, Jason %A Kim, Jang %A Shen, Zhi-Rong %A Koop, Arjen %A Borràs Nadal, Adrià %A Shi, Wei %A Zeng, Xinmeng %A Ransley, Edward %A Brown, Scott %A Hann, Martyn %A Chandramouli, Pranav %A Viré, Axelle %A Ramesh Reddy, Likhitha %A Li, Xiang %A Xiao, Qing %A Méndez López, Beatriz %A Campaña Alonso, Guillén %A Oh, Sho %A Sarlak, Hamid %A Netzband, Stefan %A Jang, Hyunchul %A Yu, Kai %< avec comité de lecture %@ 1996-1073 %J Energies %I MDPI %V 15 %N 1 %P 389 %8 2022-01-05 %D 2022 %R 10.3390/en15010389 %K CFD %K Validation %K Free Decay %K Offshore Wind %K Semisubmersible %K Uncertainty %K OC6 %K IEA %Z Environmental Sciences %Z Environmental Sciences/Environmental Engineering %Z Sciences of the Universe [physics]Journal articles %X 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. %G English %2 https://ifp.hal.science/hal-03552625/document %2 https://ifp.hal.science/hal-03552625/file/OC6%20Phase%20Ia%20CFD%20Simulations%20of%20the%20Free-Decay%20Motion%20ofthe%20Free-Decay%20Motion%20of%20the%20DeepCwind%20Semisubmersible.%20pdf.pdf %L hal-03552625 %U https://ifp.hal.science/hal-03552625 %~ SDE %~ IFP %~ GIP-BE