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

Lu Wang, Amy Robertson, Jason Jonkman, Jang Kim, Zhi-Rong Shen, Arjen Koop, Adrià Borràs Nadal, Wei Shi, Xinmeng Zeng, Edward Ransley, Scott Brown, Martyn Hann, Pranav Chandramouli, Axelle Viré, Likhitha Ramesh Reddy, Xiang Li, Qing Xiao, Beatriz Méndez López, Guillén Campaña Alonso, Sho Oh, Hamid Sarlak, Stefan Netzband, Hyunchul Jang and Kai Yu
Additional contact information
Lu Wang: National Renewable Energy Laboratory, Golden, CO 80401, USA
Amy Robertson: National Renewable Energy Laboratory, Golden, CO 80401, USA
Jason Jonkman: National Renewable Energy Laboratory, Golden, CO 80401, USA
Jang Kim: Front Energies, Houston, TX 77084, USA
Zhi-Rong Shen: Front Energies, Houston, TX 77084, USA
Arjen Koop: Maritime Research Institute Netherlands, 6708 PM Wageningen, The Netherlands
Adrià Borràs Nadal: IFP Energies Nouvelles, 92852 Rueil-Malmaison, France
Wei Shi: State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
Xinmeng Zeng: State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
Edward Ransley: School of Engineering, Computing and Mathematics, University of Plymouth, Plymouth PL4 8AA, UK
Scott Brown: School of Engineering, Computing and Mathematics, University of Plymouth, Plymouth PL4 8AA, UK
Martyn Hann: School of Engineering, Computing and Mathematics, University of Plymouth, Plymouth PL4 8AA, UK
Pranav Chandramouli: Faculty of Aerospace Engineering, Delft University of Technology, 2629 HS Delft, The Netherlands
Axelle Viré: Faculty of Aerospace Engineering, Delft University of Technology, 2629 HS Delft, The Netherlands
Likhitha Ramesh Reddy: Faculty of Aerospace Engineering, Delft University of Technology, 2629 HS Delft, The Netherlands
Xiang Li: Department of Naval Architecture, Ocean and Marine Engineering, University of Strathclyde, Glasgow G1 1XQ, UK
Qing Xiao: Department of Naval Architecture, Ocean and Marine Engineering, University of Strathclyde, Glasgow G1 1XQ, UK
Beatriz Méndez López: National Renewable Energy Centre (CENER), 31621 Sarriguren, Spain
Guillén Campaña Alonso: National Renewable Energy Centre (CENER), 31621 Sarriguren, Spain
Sho Oh: Renewable Energy Department, Nippon Kaiji Kyokai, Tokyo 102-8567, Japan
Hamid Sarlak: Aero- and Fluid-Dynamics Section, Department of Wind Energy, Technical University of Denmark, 2800 Lyngby, Denmark
Stefan Netzband: Fluid Dynamics and Ship Theory, Hamburg University of Technology, 21073 Hamburg, Germany
Hyunchul Jang: Technip Energies, Houston, TX 77079, USA
Kai Yu: American Bureau of Shipping, Houston, TX 77389, USA

Energies, 2022, vol. 15, issue 1, 1-38

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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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