Wind turbine wakes in forest and neutral plane wall boundary layer large-eddy simulations

Josef Schröttle, Zbigniew Piotrowski, Thomas Gerz, Antonia Englberger, Andreas Dörnbrack

Research output: Contribution to journalConference articlepeer-review


Wind turbine wake flow characteristics are studied in a strongly sheared and turbulent forest boundary layer and a neutral plane wall boundary layer flow. The reference simulations without wind turbine yield similar results as earlier large-eddy simulations by Shaw and Schumann (1992) and Porte-Agel et al. (2000). To use the fields from the homogeneous turbulent boundary layers on the fly as inflow fields for the wind turbine wake simulations, a new and efficient methodology was developed for the multiscale geophysical flow solver EULAG. With this method fully developed turbulent flow fields can be achieved upstream of the wind turbine which are independent of the wake flow. The large-eddy simulations reproduce known boundary-layer statistics as mean wind profile, momentum flux profile, and eddy dissipation rate of the plane wall and the forest boundary layer. The wake velocity deficit is more asymmetric above the forest and recovers faster downstream compared to the velocity deficit in the plane wall boundary layer. This is due to the inflection point in the mean streamwise velocity profile with corresponding turbulent coherent structures of high turbulence intensity in the strong shear flow above the forest.

Original languageEnglish
Article number032058
JournalJournal of Physics: Conference Series
Issue number3
StatePublished - 3 Oct 2016
Externally publishedYes
EventScience of Making Torque from Wind, TORQUE 2016 - Munich, Germany
Duration: 5 Oct 20167 Oct 2016


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