Interaction of the wakes of large offshore wind farms and wind farm clusters with the marine atmospheric boundary layer - Sub-project D: LES and OpenSource engineering models - Focus: wind farm boundary layer


BMWi (FKZ 03EE3008D)


01.11.2019 - 30.10.2022

Project partners

  • Fraunhofer-Institut für Windenergiesysteme (IWES), Oldenburg (Koordinator)
  • Technische Universität Carolo-Wilhelmina zu Braunschweig - Fakultät 4 - Maschinenbau - Institut für Flugführung
  • Sondervermögen Großforschung beim Karlsruher Institut für Technologie (KIT) - Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU), Garmisch-Partenkirchen
  • Carl von Ossietzky Universität Oldenburg - Fakultät V - Mathematik und Naturwissenschaften - Institut für Physik - ForWind - Zentrum für Windenergieforschung
    AG WESys
    AG TWiSt
    AG EnMet
  • Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH, Geesthacht
  • Eberhard Karls Universität Tübingen, Tübingen
  • UL International GmbH, Wilhelmshaven

Project objectives

The main objective of the project X-Wakes is the assessment of the change of wind conditions for the operation of offshore wind farm clusters under a large-scale offshore wind farm expansion. This is on the one hand based on a considerable measurement program with airborne and satellite based as well as LiDAR measurements at different locations offshore within the German Bight. The interaction of the wind farm clusters among themselves, that will besides by measurements be investigated in detail with Large-Eddy-Simulations will be implemented in engineering models as well as a mesoscale weather prediction model. This will enable a more realistic energy yield for future wind farm expansion scenarios. Sub-project D aims at the analysis of large-scale effects of wind farm and cluster wakes on the basis of LiDAR and SCADA data. The focus of a LiDAR measurement campaign with a duration of one year is the investigation of the development of the wind farm boundary layer and of the impact of coastal effects and neighbouring wind farms on this development. The LiDAR data will be complemented by numerical simulations of the coast-wind farm and wind farm-wind farm interaction with the means of a large-eddy simulation model. Measured and numerical data will be used for the development of parameterizations of wind farm and cluster effects in mesoscale and industry models. Examples for the further development of industry models are the introduction of a blockage effec as well as the wake deflection by the Coriols force and the larger scale atmospheric flow. The further developed industry model shall lead to a significant reduction of uncertainties in the calculation of flow conditions and therefore energy yields for wind farms in offshore wind farm clusters. At the same time the industry model shall still be attractive to be used with the restricted computational resources that are available to wind farm developers.


Specific contributions and objectives WESys

  • Planning and performance of lidar measurements in offshore wind farms DolWin 1/3
  • Analysis of the boundary layer in the wind farm cluster


applied science

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