UNAFLOW project: UNsteady Aerodynamics of FLOating Wind turbines

Bayati, Ilmas; Belloli, Marco; Bernini, Luca; Boldrin, Davide Maria; Boorsma, K.; Caboni, Marco; Cormier, Marion; Mikkelsen, Robert Flemming; Lutz, Thorsten; Zasso, Alberto

doi:10.1088/1742-6596/1037/7/072037

Cited by 29 publications

(27 citation statements)

References 1 publication

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“…No real-time controller is used neither in the experiments nor in the simulations. A more detailed description of the experimental setup, on which the current numerical study is based, and of the background and purposes of the project is to be found in [13].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Cormier

Caboni

Lutz

et al. 2018

J. Phys.: Conf. Ser.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Cormier

Caboni

Lutz

et al. 2018

J. Phys.: Conf. Ser.

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“…The level of uncertainty of current numerical codes to predict the actual pitch aerodynamic damping still requires further research efforts [8,12,9,13,6]. A FAST model of the system object of HIL test was created and simulations equivalent to experiments were run, to assess the prediction capability of the first with respect to the effect of wind turbine loads.…”

Section: Discussionmentioning

confidence: 99%

“…Aerodynamic loads were measured for different imposed sinusoidal motions [8,12] and combined to a linear model [9] to understand how the aerodynamic forcefield affects the response of the platform rigid-body motion modes. Particle image velocimetry (PIV) and hot-wire measurements were recently performed [13,6] to describe the flow field in the wind turbine wake and improve the understanding of unsteady rotor loads.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Wind Tunnel Analysis of Aerodynamic Effects on a Semi-Submersible Floating Wind Turbine Response

Fontanella

Bayati

Taruffi

et al. 2019

Volume 10: Ocean Renewable Energy

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This paper presents the main results of an experimental campaign about the DeepCwind semi-submersible floating offshore wind turbine (FOWT), that was carried out at Politecnico di Milano wind tunnel, adopting a hybrid hardware-in-the-loop (HIL) testing technique. Differently from previous works by the authors, this further analysis herein reported, is specifically focused on evaluating the effects of aerodynamic loads on the FOWT platform motions. In order to reproduce the FOWT response to combined wind and waves in a wind tunnel, exploiting the high-quality flow, a HIL system was used. The aerodynamic and rotor loads were reproduced by means of a wind turbine scale model operating inside the wind tunnel and were combined with numerically generated wave loads for real-time integration of the FOWT rigid-body motion equations. The resulting platform motions were imposed to the wind turbine scale model by a hydraulic actuation system. A series of HIL tests was performed to assess the rotor loads effect on the FOWT response. Free-decay tests in still water under laminar un-sheared wind were carried out to evaluate how the aerodynamic forcefield modifies the platform modes frequency and damping. Irregular wave tests for different steady winds were performed to investigate the dependency of platform motion from the wind turbine operating conditions. A FAST v8 model of the studied floating system was developed to support the analysis and numerical simulations were performed to reproduce environmental conditions equivalent to those of the experimental tests. The FAST model prediction capability is discussed against HIL wind tunnel tests results.

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“…airfoil, steady and unsteady full turbine loads and PIV wake measurements. Latter were investigated by (Bayati et al, 2017b(Bayati et al, , 2018b and an overview of the main results was given in Bayati et al (2018a). Concerning CFD results, only those obtained with the axisymmetric model were published in Cormier et al (2018) and included in the final project report (2018).…”

Section: Introductionmentioning

confidence: 99%

Characterization of the unsteady aerodynamic response of a floating offshore wind turbine

Mancini¹,

Boorsma²,

Caboni³

et al. 2020

Preprint

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Abstract. The disruptive potential of floating wind turbines has attracted the interest of both industry and scientific community. Lacking a rigid foundation, such machines are subject to large displacements whose impact on the aerodynamic performance is not yet fully acknowledged. In this work, the unsteady aerodynamic response to an harmonic surge motion of a scaled version of the DTU10MW turbine is investigated in detail. The imposed displacements have been chosen representative of typical platform motions. The results of different numerical models are validated against high fidelity wind tunnel tests specifically focused on the aerodynamics. Also a linear analytical model, relying on the quasi-steady assumption, is presented as a theoretical reference. The unsteady responses are shown to be dominated by the first surge harmonic and a frequency domain characterization, mostly focused on the thrust oscillation, is conducted involving aerodynamic damping and mass parameters. A very good agreement among codes, experiments and quasi-steady theory has been found clarifying some literature doubts. A convenient way to describe the unsteady results in non-dimensional form is proposed, hopefully serving as reference for future work.

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UNAFLOW project: UNsteady Aerodynamics of FLOating Wind turbines

Cited by 29 publications

References 1 publication

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Numerical and Experimental Wind Tunnel Analysis of Aerodynamic Effects on a Semi-Submersible Floating Wind Turbine Response

Characterization of the unsteady aerodynamic response of a floating offshore wind turbine

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