Single Wake Meandering, Advection and Expansion - An analysis using an adapted Pulsed Lidar and CFD LES-ACL simulations

Ewan Machefaux, Gunner Chr. Larsen, Niels Troldborg, Andreas Rettenmeier

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In this paper, single wake characteristics have been studied both experimentally and numerically. Firstly, the wake is studied experimentally using full-scale measurements from an adapted focused pulsed lidar system, which potentially gives more insight into the wake dynamics as compared to classical studies based on meteorological (met) masts and continuous wave lidar measurements, due to its capability of scanning several cross sections simultaneously. A wake center tracking procedure is used to estimate the sideways wake center displacements, also referred to as lateral meandering of the wake, and it is compared to the predictions from the Dynamic Wake Meandering model, for a selected 10 minutes dataset. Secondly, the average wake expansion in the fixed frame of reference is determined from measurements and compared to results from CFD simulations. The CFD simulations were conducted using the EllipSys3D flow solver using Large Eddy Simulation (LES) and Actuator Line Technique (ACL) to model the rotor. Discrepancies due to the uncertainties on the wake advection velocity are observed and discussed.
Original languageEnglish
Title of host publicationProdeedings of EWEA 2013
Number of pages11
PublisherEuropean Wind Energy Association (EWEA)
Publication date2013
Publication statusPublished - 2013
EventEuropean Wind Energy Conference & Exhibition 2013 - Vienna, Austria
Duration: 4 Feb 20137 Feb 2013


ConferenceEuropean Wind Energy Conference & Exhibition 2013
Internet address


  • Dynamic Wake Meandering
  • Wake expansion
  • Wake advection
  • Pulsed lidar
  • CFD
  • Large Eddy Simulation
  • Actuator Line Method


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