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Actuator line simulations of a Joukowsky and Tjaereborg rotor using spectral element and finite volume methods
Royal Inst Technol, KTH Mech, Linne FLOW Ctr, SE-10044 Stockholm, Sweden;Royal Inst Technol, Swedish ESci Res Ctr SeRC, SE-10044 Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Royal Inst Technol, KTH Mech, Linne FLOW Ctr, SE-10044 Stockholm, Sweden;Royal Inst Technol, Swedish ESci Res Ctr SeRC, SE-10044 Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. Royal Inst Technol, KTH Mech, Linne FLOW Ctr, SE-10044 Stockholm, Sweden;Royal Inst Technol, Swedish ESci Res Ctr SeRC, SE-10044 Stockholm, Sweden.
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2016 (English)In: SCIENCE OF MAKING TORQUE FROM WIND (TORQUE 2016), 2016, article id 082011Conference paper, Published paper (Refereed)
Abstract [en]

The wake structure behind a wind turbine, generated by the spectral element code Nek5000, is compared with that from the finite volume code EllipSys3D. The wind turbine blades are modeled using the actuator line method. We conduct the comparison on two different setups. One is based on an idealized rotor approximation with constant circulation imposed along the blades corresponding to Glauert's optimal operating condition, and the other is the Tjareborg wind turbine. The focus lies on analyzing the differences in the wake structures entailed by the different codes and corresponding setups. The comparisons show good agreement for the defining parameters of the wake such as the wake expansion, helix pitch and circulation of the helical vortices. Differences can be related to the lower numerical dissipation in Nek5000 and to the domain differences at the rotor center. At comparable resolution Nek5000 yields more accurate results. It is observed that in the spectral element method the helical vortices, both at the tip and root of the actuator lines, retain their initial swirl velocity distribution for a longer distance in the near wake. This results in a lower vortex core growth and larger maximum vorticity along the wake. Additionally, it is observed that the break down process of the spiral tip vortices is significantly different between the two methods, with vortex merging occurring immediately after the onset of instability in the finite volume code, while Nek5000 simulations exhibit a 2-3 radii period of vortex pairing before merging.

Place, publisher, year, edition, pages
2016. article id 082011
Series
Journal of Physics Conference Series, ISSN 1742-6588, E-ISSN 1742-6596 ; 753
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:uu:diva-400867DOI: 10.1088/1742-6596/753/8/082011ISI: 000436325702068OAI: oai:DiVA.org:uu-400867DiVA, id: diva2:1382603
Conference
Conference on Science of Making Torque from Wind (TORQUE), OCT 05-07, 2016, Munich, GERMANY
Available from: 2020-01-03 Created: 2020-01-03 Last updated: 2020-01-03Bibliographically approved

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