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    Rights statement: This is the author’s version of a work that was accepted for publication in Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Energy, 128, 2017 DOI: 10.1016/j.energy.2017.04.017

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Darrieus wind turbine blade unsteady aerodynamics: a three-dimensional Navier-Stokes CFD assessment

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Darrieus wind turbine blade unsteady aerodynamics : a three-dimensional Navier-Stokes CFD assessment. / Balduzzi, Francesco; Drofelnik, Jernej; Bianchini, Alessandro; Ferrara, Giovanni; Ferrari, Lorenzo; Campobasso, Michele Sergio.

In: Energy, Vol. 128, 01.06.2017, p. 550-563.

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Balduzzi, Francesco ; Drofelnik, Jernej ; Bianchini, Alessandro ; Ferrara, Giovanni ; Ferrari, Lorenzo ; Campobasso, Michele Sergio. / Darrieus wind turbine blade unsteady aerodynamics : a three-dimensional Navier-Stokes CFD assessment. In: Energy. 2017 ; Vol. 128. pp. 550-563.

Bibtex

@article{1649a94517f24c8a95a7e392eeade925,
title = "Darrieus wind turbine blade unsteady aerodynamics: a three-dimensional Navier-Stokes CFD assessment",
abstract = "Energized by the recent rapid progress in high-performance computing and the growing availability of large computational resources, computational fluid dynamics (CFD) is offering a cost-effective, versatile and accurate means to improve the understanding of the unsteady aerodynamics of Darrieus wind turbines, increase their efficiency and delivering more cost-effective and structurally sound designs.In this study, a Navier-Stokes CFD research code featuring a very high parallel efficiency was used to thoroughly investigate the three-dimensional unsteady aerodynamics of a Darrieus rotor blade. Highly spatially and temporally resolved unsteady simulations were carried out using more than 16,000 processor cores on an IBM BG/Q cluster. The study aims at providing a detailed description and quantification of the main three-dimensional effects associated with the periodic motion of this turbine type, including tip losses, dynamic stall, vortex propagation and blade/wake interaction. Presented results reveal that the three-dimensional flow effects affecting Darrieus rotor blades are significantly more complex than assumed by the lower-fidelity models often used for design applications, and strongly vary during the rotor revolution. A comparison of the CFD integral estimates and the results of a blade-element momentum code is also presented to highlight strengths and weaknesses of low-fidelity codes for Darrieus turbine design.The reported CFD results may provide a valuable and reliable benchmark for the calibration of lower-fidelity models, which are still key to industrial design due to their very high execution speed.",
keywords = "navier-stokes computational fluid dynamics, Darrieus wind turbine aerodynamics, unsteady Navier-Stokes simulations, low-speed preconditioning, Shear-Stress Transport turbulence model, supercomputing, three-dimensional losses, engineering design",
author = "Francesco Balduzzi and Jernej Drofelnik and Alessandro Bianchini and Giovanni Ferrara and Lorenzo Ferrari and Campobasso, {Michele Sergio}",
note = "This is the author{\textquoteright}s version of a work that was accepted for publication in Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Energy, ??, ?, 2017 DOI: 10.1016/j.energy.2017.04.017",
year = "2017",
month = jun,
day = "1",
doi = "10.1016/j.energy.2017.04.017",
language = "English",
volume = "128",
pages = "550--563",
journal = "Energy",
issn = "0360-5442",
publisher = "Elsevier Limited",

}

RIS

TY - JOUR

T1 - Darrieus wind turbine blade unsteady aerodynamics

T2 - a three-dimensional Navier-Stokes CFD assessment

AU - Balduzzi, Francesco

AU - Drofelnik, Jernej

AU - Bianchini, Alessandro

AU - Ferrara, Giovanni

AU - Ferrari, Lorenzo

AU - Campobasso, Michele Sergio

N1 - This is the author’s version of a work that was accepted for publication in Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Energy, ??, ?, 2017 DOI: 10.1016/j.energy.2017.04.017

PY - 2017/6/1

Y1 - 2017/6/1

N2 - Energized by the recent rapid progress in high-performance computing and the growing availability of large computational resources, computational fluid dynamics (CFD) is offering a cost-effective, versatile and accurate means to improve the understanding of the unsteady aerodynamics of Darrieus wind turbines, increase their efficiency and delivering more cost-effective and structurally sound designs.In this study, a Navier-Stokes CFD research code featuring a very high parallel efficiency was used to thoroughly investigate the three-dimensional unsteady aerodynamics of a Darrieus rotor blade. Highly spatially and temporally resolved unsteady simulations were carried out using more than 16,000 processor cores on an IBM BG/Q cluster. The study aims at providing a detailed description and quantification of the main three-dimensional effects associated with the periodic motion of this turbine type, including tip losses, dynamic stall, vortex propagation and blade/wake interaction. Presented results reveal that the three-dimensional flow effects affecting Darrieus rotor blades are significantly more complex than assumed by the lower-fidelity models often used for design applications, and strongly vary during the rotor revolution. A comparison of the CFD integral estimates and the results of a blade-element momentum code is also presented to highlight strengths and weaknesses of low-fidelity codes for Darrieus turbine design.The reported CFD results may provide a valuable and reliable benchmark for the calibration of lower-fidelity models, which are still key to industrial design due to their very high execution speed.

AB - Energized by the recent rapid progress in high-performance computing and the growing availability of large computational resources, computational fluid dynamics (CFD) is offering a cost-effective, versatile and accurate means to improve the understanding of the unsteady aerodynamics of Darrieus wind turbines, increase their efficiency and delivering more cost-effective and structurally sound designs.In this study, a Navier-Stokes CFD research code featuring a very high parallel efficiency was used to thoroughly investigate the three-dimensional unsteady aerodynamics of a Darrieus rotor blade. Highly spatially and temporally resolved unsteady simulations were carried out using more than 16,000 processor cores on an IBM BG/Q cluster. The study aims at providing a detailed description and quantification of the main three-dimensional effects associated with the periodic motion of this turbine type, including tip losses, dynamic stall, vortex propagation and blade/wake interaction. Presented results reveal that the three-dimensional flow effects affecting Darrieus rotor blades are significantly more complex than assumed by the lower-fidelity models often used for design applications, and strongly vary during the rotor revolution. A comparison of the CFD integral estimates and the results of a blade-element momentum code is also presented to highlight strengths and weaknesses of low-fidelity codes for Darrieus turbine design.The reported CFD results may provide a valuable and reliable benchmark for the calibration of lower-fidelity models, which are still key to industrial design due to their very high execution speed.

KW - navier-stokes computational fluid dynamics

KW - Darrieus wind turbine aerodynamics, unsteady Navier-Stokes simulations, low-speed preconditioning, Shear-Stress Transport turbulence model

KW - supercomputing

KW - three-dimensional losses

KW - engineering design

U2 - 10.1016/j.energy.2017.04.017

DO - 10.1016/j.energy.2017.04.017

M3 - Journal article

VL - 128

SP - 550

EP - 563

JO - Energy

JF - Energy

SN - 0360-5442

ER -