Impact of aerodynamic modeling on seakeeping performance of a floating horizontal axis wind turbine

Leroy, Vincent; Gilloteaux, Jean‐Christophe; Lynch, Mattias; Babarit, Aurélien; Ferrant, P.

doi:10.1002/we.2337

Cited by 9 publications

(5 citation statements)

References 24 publications

(56 reference statements)

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“…From the wave-structure interaction point of view, the horizontal side-to-side motions of an FOWT can be divided primarily into two groups, i.e. those in the wave frequencies and those at the natural frequencies of the sway or the roll motion (Jonkman & Musial 2010;Robertson et al 2014;Leroy et al 2019). For this reason, the present work selects a rather large frequency range to analyse the influence of different motions from both groups, as shown in table 2.…”

Section: Side-to-side Motionsmentioning

confidence: 99%

Onset of wake meandering for a floating offshore wind turbine under side-to-side motion

Dong

Yang

2022

J. Fluid Mech.

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Wind turbine wakes, being convectively unstable, may behave as an amplifier of upstream perturbations and make downstream turbines experience strong inflow fluctuations. In this work, we investigate the effects of the side-to-side motion of a floating offshore wind turbine (FOWT) on wake dynamics using large-eddy simulation and linear stability analysis (LSA). When the inflow turbulence intensity is low, simulation results reveal that the turbine motion with certain Strouhal numbers $St = fD/U_\infty \in (0.2,0.6)$ (where $f$ is the motion frequency, $D$ is the rotor diameter, and $U_\infty$ is the incoming wind speed), which overlap with the Strouhal numbers of wake meandering induced by the shear layer instability, can lead to wake meandering with amplitudes being one order of magnitude larger than the FOWT motion for the most unstable frequency. For high inflow turbulence intensity, on the other hand, the onset of wake meandering is dominated by the inflow turbulence. The probability density function of the spanwise instantaneous wake centres is observed being non-Gaussian and closely related to that of the side-to-side motion. This complements the existing wake meandering mechanisms, that the side-to-side motion of an FOWT can be a novel origin for the onset of wake meandering. It is also found that LSA can predict the least stable frequencies and the amplification factor with acceptable accuracy for motion amplitude $0.01D$ . Effects of nonlinearity are observed when motion amplitude increases to $0.04D$ , for which the most unstable turbine oscillations shift slightly to lower frequencies and the amplification factor decreases.

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Section: Side-to-side Motionsmentioning

confidence: 99%

Onset of wake meandering for a floating offshore wind turbine under side-to-side motion

Dong

Yang

2022

J. Fluid Mech.

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“…They however noted the advantages of using FVW models to study dynamic inflow as it provides access to the induced velocities along the blade, as opposed to blade‐resolved CFD where these values are more complicated to obtain. The surge motion of a wind turbine on a floater as an oscillating motion has been previously studied with an actuator disk method by de Vaal et al 14 and with the FVW method by Leroy et al 15 …”

Section: Introductionmentioning

confidence: 99%

“…They however noted the advantages of using FVW models to study dynamic inflow as it provides access to the induced velocities along the blade, as opposed to blade-resolved CFD where these values are more complicated to obtain. The surge motion of a wind turbine on a floater as an oscillating motion has been previously studied with an actuator disk method by de Vaal et al 14 and with the FVW method by Leroy et al 15 An experimental analysis of the dynamic inflow effect was done in the NREL Phase VI project. 16,17 Measurements were done at five different radial positions along the blade, giving some insight into the radial behavior of the dynamic inflow.…”

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confidence: 99%

The aerodynamics of a blade pitch, rotor speed, and surge step for a wind turbine regarding dynamic inflow

2022

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Floater motions introduce unsteadiness in the aerodynamics of floating offshore wind turbines. The aerodynamics of a wind turbine after three perturbations are studied: a blade pitch step, a rotor speed step for which dynamic inflow is expected, and a surge velocity step. The free vortex wake method and an analytical helical vortex model based on the Joukowsky rotor model are used to study the dynamic behavior of the induced velocity at the blades. As expected, the dynamic inflow effect is clear for the blade pitch and rotor speed changes, but for a surge velocity step, the models show that very little dynamic inflow effect takes place because the velocity induced by the vortex helix is not significantly modified: the tip vortex helix circulation change is partially compensated by the geometry change of the helix. For the rate of change, the velocities induced on the rotor by the vortex helix for the pitch and rotor speed changes show a rapid adjustment at the blade tip, with a slower change throughout the rest of the blade and at the center of the rotor.The convection velocity of the tip vortices is shown to be the main variable of the temporal evolution of the dynamic inflow effect.

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“…A similar study has been done following the same methodology on a floating HAWT in Leroy et al. The study here compares PVW and FVW unsteady aerodynamic solvers with a state‐of‐the‐art blade element momentum quasi‐steady aerodynamic solver.…”

Section: Resultsmentioning

confidence: 99%

Impact of aerodynamic modelling on seakeeping performance of a floating vertical axis wind turbine

Leroy

Gilloteaux

Lynch³

et al. 2019

Wind Energy

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This study focuses on the impact of the aerodynamic model on the dynamic response of a floating vertical axis wind turbine (VAWT). It compares a state‐of‐the‐art quasi‐steady double multiple streamtube (DMS) solver, a prescribed vortex wake (PVW), and a free vortex wake (FVW) solver. The aerodynamic loads acting on a bottom‐fixed VAWT and computed with the three aerodynamic solvers are compared, then the dynamic responses of the floating turbine in irregular waves and turbulent wind with the different aerodynamic solvers are compared. Differences are observed, particularly in the mean motions of the platform. Eventually, the aerodynamic damping computed by the solvers are estimated with aerodynamic simulations on the turbine with imposed surge and pitch motions. The estimated damping can then be correlated with the dynamic response amplitude of the VAWT. Substantial discrepancies are observed between the three solvers at high tip speed ratio, when the rotor is highly loaded. It is shown that the quasi‐steady DMS solver seems to give greater amplitude of motions for the floating VAWT because of strong rotor/wake interaction that are not correctly accounted for.

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Impact of aerodynamic modeling on seakeeping performance of a floating horizontal axis wind turbine

Cited by 9 publications

References 24 publications

Onset of wake meandering for a floating offshore wind turbine under side-to-side motion

Onset of wake meandering for a floating offshore wind turbine under side-to-side motion

The aerodynamics of a blade pitch, rotor speed, and surge step for a wind turbine regarding dynamic inflow

Impact of aerodynamic modelling on seakeeping performance of a floating vertical axis wind turbine

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