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Impact of Neutral Boundary-Layer Turbulence on Wind-Turbine Wakes: A Numerical Modelling Study

Englberger, Antonia and Dörnbrack, Andreas (2017) Impact of Neutral Boundary-Layer Turbulence on Wind-Turbine Wakes: A Numerical Modelling Study. Boundary-Layer Meteorology, 162 (3), pp. 427-449. Springer. DOI: 10.1007/s10546-016-0208-z ISSN 0006-8314

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Official URL: http://dx.doi.org/10.1007/s10546-016-0208-z

Abstract

The wake characteristics of a wind turbine in a turbulent boundary layer under neutral stratification are investigated systematically by means of large-eddy simulations. A methodology to maintain the turbulence of the background flow for simulations with open horizontal boundaries, without the necessity of the permanent import of turbulence data from a precursor simulation, was implemented in the geophysical flow solver EULAG. These requirements are fulfilled by applying the spectral energy distribution of a neutral boundary layer in the wind-turbine simulations. A detailed analysis of the wake response towards different turbulence levels of the background flow results in a more rapid recovery of the wake for a higher level of turbulence.Amodified version of the Rankine–Froude actuator disc model and the blade element momentum method are tested as wind-turbine parametrizations resulting in a strong dependence of the near-wake wind field on the parametrization, whereas the far-wake flow is fairly insensitive to it. The wake characteristics are influenced by the two considered airfoils in the blade element momentum method up to a streamwise distance of 14D (D=rotor diameter). In addition, the swirl induced by the rotation has an impact on the velocity field of the wind turbine even in the far wake. Further, a wake response study reveals a considerable effect of different subgrid-scale closure models on the streamwise turbulent intensity.

Item URL in elib:https://elib.dlr.de/107193/
Document Type:Article
Title:Impact of Neutral Boundary-Layer Turbulence on Wind-Turbine Wakes: A Numerical Modelling Study
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Englberger, AntoniaDLR, IPAUNSPECIFIED
Dörnbrack, AndreasDLR, IPAUNSPECIFIED
Date:2017
Journal or Publication Title:Boundary-Layer Meteorology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:162
DOI :10.1007/s10546-016-0208-z
Page Range:pp. 427-449
Publisher:Springer
ISSN:0006-8314
Status:Published
Keywords:Atmospheric boundary layer · Large-eddy simulation · Turbulence ·Wind-turbine wake
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:other
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Wind Energy (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Ziegele, Brigitte
Deposited On:31 Oct 2016 07:47
Last Modified:06 Sep 2019 15:19

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