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

Cioni, Stefano; Papi, Francesco; Pagamonci, Leonardo; Bianchini, Alessandro; Schulz, Christian; Ramos García, Néstor; Pirrung, Georg; Corniglion, Rémi; Lovera, Anaïs; Galvan, Josean; Boisard, Ronan; Fontanella, Alessandro; Schito, Paolo; Zasso, Alberto; Belloli, Marco; Sanvito, Andrea G.; Persico, Giacomo Bruno Azzurro; Zhang, Lijun; Li, Ye; Zhou, Yarong

doi:10.15480/882.8929

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

Citation Link: https://doi.org/10.15480/882.8929

Publikationstyp

Journal Article

Date Issued

2023-11-10

Sprache

English

TORE-DOI

10.15480/882.8929

TORE-URI

https://hdl.handle.net/11420/44586

Journal

Wind energy science

Volume

8

Issue

11

Start Page

1659

End Page

1691

Citation

Wind Energy Science 8 (11): 1659-1691 (2023-11-10)

Publisher DOI

10.5194/wes-8-1659-2023

Scopus ID

2-s2.0-85178243716

Publisher

Copernicus Publications

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.

DDC Class

333.7: Natural Resources, Energy and Environment

Funding(s)

Validierung, Messung und Optimierung von schwimmenden Windenergiesystemen; Teilvorhaben: Erweiterung und Validierung einer Panelmethode zur Simulation des dynamischen Betriebsverhaltens schwimmender Windenergiesysteme

Publication version

publishedVersion

Lizenz

https://creativecommons.org/licenses/by/4.0/

Name

wes-8-1659-2023.pdf

Type

Main Article

Size

8.58 MB

Format

Adobe PDF

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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