On the characteristics of the wake of a wind turbine undergoing large motions caused by a floating structure: an insight based on experiments and multi-fidelity simulations from the OC6 project Phase III
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- Univ. of Florence (Italy)
- Technical Univ. of Denmark, Lyngby (Denmark)
- Electricite de France (EDF) R&D, Chatou (France)
- Electricite de France (EDF) R&D, Palaiseau (France)
- eureka!, Errigoiti (Spain)
- ONERA, The French Aerospace Lab., Paris (France)
- Politecnico di Milano (Italy)
- Shanghai Jiao Tong Univ. (China)
- Netherlands Organisation for Applied Scientific Research, Petten (Netherlands)
- Siemens Gamesa Renewable Energy, Saint-Étienne-du-Rouvray (France); Delft Univ. of Technology (Netherlands)
- Delft Univ. of Technology (Netherlands)
- Hamburg University of Technology (Germany)
- Universidad de la Frontera, Temuco (Chile)
- Technische Univ. Berlin (Germany)
- Centro Nacional de Energias Renovables (CENER), Sarriguen (Spain)
- Universitat Politècnica de Catalunya, Barcelona (Spain)
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
This study reports the results of the second round of analyses of the Offshore Code Comparison, Collaboration, Continued, with Correlation and unCertainty (OC6) project Phase III. While the first round investigated rotor aerodynamic loading, here, focus is given to the wake behavior of a floating wind turbine under large motion. Wind tunnel experimental data from the UNsteady Aerodynamics for FLOating Wind (UNAFLOW) project are compared with the results of simulations provided by participants with methods and codes of different levels of fidelity. The effect of platform motion on both the near and the far wake is investigated. More specifically, the behavior of tip vortices in the near wake is evaluated through multiple metrics, such as streamwise position, core radius, convection velocity, and circulation. Additionally, the onset of velocity oscillations in the far wake is analyzed because this can have a negative effect on stability and loading of downstream rotors. Results in the near wake for unsteady cases confirm that simulations and experiments tend to diverge from the expected linearized quasi-steady behavior when the rotor reduced frequency increases over 0.5. Additionally, differences across the simulations become significant, suggesting that further efforts are required to tune the currently available methodologies in order to correctly evaluate the aerodynamic response of a floating wind turbine in unsteady conditions. Regarding the far wake, it is seen that, in some conditions, numerical methods overpredict the impact of platform motion on the velocity fluctuations. Moreover, results suggest that the effect of platform motion on the far wake, differently from original expectations about a faster wake recovery in a floating wind turbine, seems to be limited or even oriented to the generation of a wake less prone to dissipation.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office; Dutch Research Council (NWO)
- Grant/Contract Number:
- AC36-08GO28308
- OSTI ID:
- 2280961
- Report Number(s):
- NREL/JA--5000-88496; MainId:89275; UUID:617a582b-f1ba-4558-a009-ac838102512e; MainAdminID:71497
- Journal Information:
- Wind Energy Science (Online), Journal Name: Wind Energy Science (Online) Journal Issue: 11 Vol. 8; ISSN 2366-7451
- Publisher:
- Copernicus PublicationsCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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