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A Numerically Efficient Parametrization of Turbulent Wind-Turbine Flows for Different Thermal Stratifications

Englberger, Antonia and Dörnbrack, Andreas (2018) A Numerically Efficient Parametrization of Turbulent Wind-Turbine Flows for Different Thermal Stratifications. Boundary-Layer Meteorology, pp. 1-32. Springer. DOI: 10.1007/s10546-018-0377-z ISSN 0006-8314

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Official URL: http://dx.doi.org/10.1007/s10546-018-0377-z

Abstract

The wake characteristics of a wind turbine in a turbulent atmospheric boundary layer under different thermal stratifications are investigated by means of large-eddy simulation with the geophysical flow solver EULAG. The turbulent inflow is based on a method that imposes the spectral energy distribution of a neutral boundary-layer precursor simulation, the turbulence-preserving method. This method is extended herein to make it applicable for different thermal stratification regimes (convective, stable, neutral) by including suitable turbulence assumptions, which are deduced from velocity fields of a diurnal-cycle precursor simulation. The wind-turbine-wake characteristics derived from simulations that include the parametrization result in good agreement with diurnal-cycle-driven wind-turbine simulations. Furthermore, different levels of accuracy are tested in the parametrization assumptions, representing the thermal stratification. These range from three-dimensional matrices of the precursor-simulation wind field to individual values. The resulting wake characteristics are similar, even for the simplest parametrization set-up, making the diurnal-cycle precursor simulation non-essential for the wind-turbine simulations. Therefore, the proposed parametrization results in a computationally fast, simple, and efficient tool for analyzing the effects of different thermal stratifications on wind-turbine wakes by means of large-eddy simulation.

Item URL in elib:https://elib.dlr.de/121434/
Document Type:Article
Title:A Numerically Efficient Parametrization of Turbulent Wind-Turbine Flows for Different Thermal Stratifications
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Englberger, AntoniaDLR, IPAUNSPECIFIED
Dörnbrack, AndreasDLR, IPAhttps://orcid.org/0000-0003-0936-0216
Date:2018
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
DOI :10.1007/s10546-018-0377-z
Page Range:pp. 1-32
Publisher:Springer
ISSN:0006-8314
Status:Published
Keywords:Atmospheric boundary layer Diurnal cycle Large-eddy simulation Turbulence Wind-turbine wake
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Ziegele, Brigitte
Deposited On:21 Aug 2018 12:07
Last Modified:06 Sep 2019 15:19

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