New method to capture traveling waves in flow passing a wind turbine

Soledad Le Clainche*, Xuerui Mao, José M. Vega

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Flow structures in the wake of a wind turbine are analysed by performing spatio-temporal Koopman decomposition (STKD). STKD is a new method to decompose the flow field as a combination of travelling waves and to extract the frequency and wavenumbers (characterizing a specific spatial direction) of the dominant waves. The results indicate that the complex unsteady behaviour of the turbine wake flow is mainly driven by a single wave travelling downstream, combined with smaller amplitude traveling waves representing the flow rotation. This result agrees with the general description of the wake of a wind turbine regarded as the combination of self-sustained oscillations and the development of upstream external noise, which are represented by the dominant traveling wave and the small-magnitude ones, respectively.

Original languageEnglish
Pages (from-to)922-931
Number of pages10
JournalWind Energy
Volume22
Issue number7
DOIs
Publication statusPublished - Jul 2019
Externally publishedYes

Keywords

  • DMD
  • HODMD
  • Koopman modes
  • STKD
  • flow structures
  • wind turbines

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Le Clainche, S., Mao, X., & Vega, J. M. (2019). New method to capture traveling waves in flow passing a wind turbine. Wind Energy, 22(7), 922-931. https://doi.org/10.1002/we.2331