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High-Order Numerical Simulations of Wind Turbine Wakes
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0001-9627-5903
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre. Uppsala University, Sweden.
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2017 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 854, no 1, 012025Article in journal (Refereed) Published
Abstract [en]

Previous attempts to describe the structure of wind turbine wakes and their mutual interaction were mostly limited to large-eddy and Reynolds-averaged Navier-Stokes simulations using finite-volume solvers. We employ the higher-order spectral-element code Nek5000 to study the influence of numerical aspects on the prediction of the wind turbine wake structure and the wake interaction between two turbines. The spectral-element method enables an accurate representation of the vortical structures, with lower numerical dissipation than the more commonly used finite-volume codes. The wind-turbine blades are modeled as body forces using the actuator-line method (ACL) in the incompressible Navier-Stokes equations. Both tower and nacelle are represented with appropriate body forces. An inflow boundary condition is used which emulates homogeneous isotropic turbulence of wind-tunnel flows. We validate the implementation with results from experimental campaigns undertaken at the Norwegian University of Science and Technology (NTNU Blind Tests), investigate parametric influences and compare computational aspects with existing numerical simulations. In general the results show good agreement between the experiments and the numerical simulations both for a single-turbine setup as well as a two-turbine setup where the turbines are offset in the spanwise direction. A shift in the wake center caused by the tower wake is detected similar to experiments. The additional velocity deficit caused by the tower agrees well with the experimental data. The wake is captured well by Nek5000 in comparison with experiments both for the single wind turbine and in the two-turbine setup. The blade loading however shows large discrepancies for the high-turbulence, two-turbine case. While the experiments predicted higher thrust for the downstream turbine than for the upstream turbine, the opposite case was observed in Nek5000.

Place, publisher, year, edition, pages
Institute of Physics Publishing , 2017. Vol. 854, no 1, 012025
Keyword [en]
Incompressible flow, Navier Stokes equations, Numerical methods, Numerical models, Turbomachine blades, Turbulence, Vortex flow, Wakes, Wind turbines, Comparison with experiments, Homogeneous isotropic turbulence, Incompressible Navier Stokes equations, Inflow boundary conditions, Numerical dissipation, Reynolds-averaged navier-stokes simulations, Science and Technology, Spectral element method, Turbine components
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-216460DOI: 10.1088/1742-6596/854/1/012025Scopus ID: 2-s2.0-85023600314OAI: oai:DiVA.org:kth-216460DiVA: diva2:1162978
Conference
30 May 2017 through 1 June 2017
Note

QC 20171205

Available from: 2017-12-05 Created: 2017-12-05 Last updated: 2017-12-05Bibliographically approved

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Kleusberg, ElektraSchlatter, PhilippHenningson, Dan S.

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Kleusberg, ElektraSchlatter, PhilippIvanell, StefanHenningson, Dan S.
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Stability, Transition and ControlLinné Flow Center, FLOWSeRC - Swedish e-Science Research CentreMechanics
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Journal of Physics, Conference Series
Fluid Mechanics and Acoustics

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