A numerical investigation of a wind turbine wake in non-neutral atmospheric conditions

M.  Baungaard; Mahdi Abkar; M.P.   van der Laan; M.  Kelly

doi:10.1088/1742-6596/2265/2/022015

A numerical investigation of a wind turbine wake in non-neutral atmospheric conditions

M. Baungaard^*, Mahdi Abkar, M.P. van der Laan, M. Kelly

^*Corresponding author for this work

Department of Mechanical and Production Engineering - Fluids and Energy

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

3 Citations (Scopus)

55 Downloads (Pure)

Abstract

Wind turbine wakes cause energy losses and increased blade fatigue loads in wind farms. The magnitude of these effects depend strongly on the atmospheric conditions. In nonneutral atmospheric conditions, there is a turbulence kinetic energy (TKE) contribution from buoyancy, either positive (convective boundary layer, CBL) or negative (stable boundary layer, SBL). In this work, both conditions are analyzed with new large-eddy simulation (LES) data of a single wind turbine wake in flat, homogeneous terrain to quantify the effects of buoyancy. It is found that the buoyancy contribution is negligible compared to the shear production in the wake region and the role of buoyancy is therefore mainly to alter the inflow profiles. This fact is used in a simple Reynolds-averaged Navier-Stokes (RANS) turbulence model, which shows reasonable results for wake velocity deficit compared to LES data.

Original language	English
Article number	022015
Book series	Journal of Physics Conference Series
Volume	2265
Issue	2
Number of pages	11
ISSN	1742-6588
DOIs	https://doi.org/10.1088/1742-6596/2265/2/022015
Publication status	Published - 2 Jun 2022

Access to Document

10.1088/1742-6596/2265/2/022015

Baungaard_2022_J._Phys. _Conf._Ser._2265_022015Final published version, 1.06 MBLicence: CC BY

https://iopscience.iop.org/article/10.1088/1742-6596/2265/2/022015/pdf

Cite this

@article{f43eeb3c6d4c49568ae7fca7bc4bc718,

title = "A numerical investigation of a wind turbine wake in non-neutral atmospheric conditions",

abstract = "Wind turbine wakes cause energy losses and increased blade fatigue loads in wind farms. The magnitude of these effects depend strongly on the atmospheric conditions. In nonneutral atmospheric conditions, there is a turbulence kinetic energy (TKE) contribution from buoyancy, either positive (convective boundary layer, CBL) or negative (stable boundary layer, SBL). In this work, both conditions are analyzed with new large-eddy simulation (LES) data of a single wind turbine wake in flat, homogeneous terrain to quantify the effects of buoyancy. It is found that the buoyancy contribution is negligible compared to the shear production in the wake region and the role of buoyancy is therefore mainly to alter the inflow profiles. This fact is used in a simple Reynolds-averaged Navier-Stokes (RANS) turbulence model, which shows reasonable results for wake velocity deficit compared to LES data.",

author = "M. Baungaard and Mahdi Abkar and {van der Laan}, M.P. and M. Kelly",

year = "2022",

month = jun,

day = "2",

doi = "10.1088/1742-6596/2265/2/022015",

language = "English",

volume = "2265",

journal = "Journal of Physics Conference Series",

issn = "1742-6588",

publisher = "Institute of Physics Publishing Ltd.",

number = "2",

}

A numerical investigation of a wind turbine wake in non-neutral atmospheric conditions. / Baungaard, M. ; Abkar, Mahdi; van der Laan, M.P. et al.
In: Journal of Physics Conference Series, Vol. 2265, No. 2, 022015, 02.06.2022.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

TY - JOUR

T1 - A numerical investigation of a wind turbine wake in non-neutral atmospheric conditions

AU - Baungaard, M.

AU - Abkar, Mahdi

AU - van der Laan, M.P.

AU - Kelly, M.

PY - 2022/6/2

Y1 - 2022/6/2

N2 - Wind turbine wakes cause energy losses and increased blade fatigue loads in wind farms. The magnitude of these effects depend strongly on the atmospheric conditions. In nonneutral atmospheric conditions, there is a turbulence kinetic energy (TKE) contribution from buoyancy, either positive (convective boundary layer, CBL) or negative (stable boundary layer, SBL). In this work, both conditions are analyzed with new large-eddy simulation (LES) data of a single wind turbine wake in flat, homogeneous terrain to quantify the effects of buoyancy. It is found that the buoyancy contribution is negligible compared to the shear production in the wake region and the role of buoyancy is therefore mainly to alter the inflow profiles. This fact is used in a simple Reynolds-averaged Navier-Stokes (RANS) turbulence model, which shows reasonable results for wake velocity deficit compared to LES data.

AB - Wind turbine wakes cause energy losses and increased blade fatigue loads in wind farms. The magnitude of these effects depend strongly on the atmospheric conditions. In nonneutral atmospheric conditions, there is a turbulence kinetic energy (TKE) contribution from buoyancy, either positive (convective boundary layer, CBL) or negative (stable boundary layer, SBL). In this work, both conditions are analyzed with new large-eddy simulation (LES) data of a single wind turbine wake in flat, homogeneous terrain to quantify the effects of buoyancy. It is found that the buoyancy contribution is negligible compared to the shear production in the wake region and the role of buoyancy is therefore mainly to alter the inflow profiles. This fact is used in a simple Reynolds-averaged Navier-Stokes (RANS) turbulence model, which shows reasonable results for wake velocity deficit compared to LES data.

UR - http://www.scopus.com/inward/record.url?scp=85131864458&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/2265/2/022015

DO - 10.1088/1742-6596/2265/2/022015

M3 - Journal article

SN - 1742-6588

VL - 2265

JO - Journal of Physics Conference Series

JF - Journal of Physics Conference Series

IS - 2

M1 - 022015

ER -

A numerical investigation of a wind turbine wake in non-neutral atmospheric conditions

Abstract

Access to Document

Other files and links

Fingerprint

Cite this