Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Cormier, Marion; Caboni, Marco; Lutz, Thorsten; Boorsma, K.; Krämer, Ewald

doi:10.1088/1742-6596/1037/7/072048

Cited by 23 publications

(28 citation statements)

References 15 publications

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“…For future measurements, the calibration of the (conical) five-hole probes could simply be expanded to larger angles up to ±40 • (Fingersh and Robinson, 1998). This then allows for a lower TAS of the UAV, which in turn results in lower pressures at the pressure transducers and a better spacial resolution of the data.…”

Section: Discussionmentioning

confidence: 99%

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First identification and quantification of detached-tip vortices behind a wind energy converter using fixed-wing unmanned aircraft system

et al. 2019

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Abstract. In the present study, blade-tip vortices have been experimentally identified in the wake of a commercial wind turbine using the Multi-purpose Airborne Sensor Carrier Mark 3 (MASC Mk 3) unmanned aircraft system (UAS) of the University of Tübingen. By evaluation of the wind components, detached blade-tip vortices were identified in the time series. From these measurements, the circulation and core radius of a pair of detached blade-tip vortices is calculated using the Burnham–Hallock (BH) wake vortex model. The presented data were captured under a dominating marine stratification about 2km from the North Sea coastline with northern wind direction. The measured vortices are also compared to the analytical solution of the BH model for two vortices spinning in opposite directions. The model has its origin in aviation, where it describes two aircraft wake vortices spinning in opposite directions. An evaluation method is presented to measure detached-tip vortices with a fixed-wing UAS. The BH model will be used to describe wake vortex properties behind a wind energy converter (WEC). The circulation and core radius of detached blade-tip vortices will be calculated. Also a proposition of the model for WEC wake evaluations will be made to describe two independent co-rotating vortices. Quantifying blade-tip vortices helps to understand the process of vortices detaching from a rotor blade of a wind turbine, their development in the wake until finally dissipating in the far wake and contributing to overall atmospheric turbulence. This is especially interesting for set-ups of numerical simulations when setting the spatial resolution of the simulation grid.

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Section: Discussionmentioning

confidence: 99%

“…The modelled rotor is a stand-alone generic model of the Enercon E-112 WEC rotor, based on free-access airfoil data. For more details regarding the numerical methods, please refer to Cormier et al (2018) in which the same methods have been applied and described. Figures 5 and 6 give a qualitative impression of the presence of the WEC wake.…”

Section: Methodsmentioning

confidence: 99%

First identification and quantification of detached-tip vortices behind a wind energy converter using fixed-wing unmanned aircraft system

et al. 2019

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“…The modelled rotor is a stand alone generic recreation of the Enercon E-112 WEC rotor, based on free access airfoil data. For more details regarding the numerical methods, please refer to Cormier et al (2018) in which the same methods have been applied and described. Figures 5 and 6 give a qualitative impression of the presence of the WEC wake.…”

Section: Methodsmentioning

confidence: 99%

First Identification and Quantification of Detached Tip VorticesBehind a WEC Using Fixed Wing UAS

Mauz

Rautenberg

Platis

et al. 2019

Preprint

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Abstract. Quantifying blade tip vortices helps to understand the process of vortices detaching from the wind converter blade and their development in the wake until finally dissipating in the far wake, contributing to overall turbulence. This is especially interesting for set-ups of numerical simulations when setting the spatial resolution of the simulation grid. The MASC MK 3 (Multi-purpose Airborne Sensor Carrier Mark 3) UAS (Unmanned Aircraft System) by the University of Tübingen measured atmospheric and meteorological quantities during the HeliOW campaign in July 2018 data behind a wind energy converter (WEC) (Enercon E-112) north of Wilhelmshaven, Germany, at the Jade Wind Park. Aside turbulence distribution, air temperature, humidity and the three wind components u, v, w in front of the WEC and in the wake were measured. By evaluation of the wind components, detached blade tip vortices were identified in the time series. The presented data were captured under a dominating marine stratification about 2 km from the North Sea coast line with northern wind direction. The measured vortices are compared to the analytical Burnham-Hallock model for two vortices spinning in opposite direction. The model has its origin in aviation, where it describes two aircraft wake vortices. It will be shown that the BH model can be used to describe wake vortices behind a WEC. An evaluation method is presented to measure detached tip vortices with a fixed wing UAS. Also an improvement for the model in WEC wake use will be proposed.

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“…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). Moreover, an inconsistency in the set up of several simulations was later discovered, explaining the large discrepancies found in the comparison.…”

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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Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Cited by 23 publications

References 15 publications

First identification and quantification of detached-tip vortices behind a wind energy converter using fixed-wing unmanned aircraft system

First identification and quantification of detached-tip vortices behind a wind energy converter using fixed-wing unmanned aircraft system

First Identification and Quantification of Detached Tip VorticesBehind a WEC Using Fixed Wing UAS

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

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