BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Simulation and Modeling of Wakes behind Wind Turbine Rotors and in
  Wind Farms
DTSTART:20120529T161500
DTEND:20120529T171500
DTSTAMP:20260916T061327Z
UID:84b35219798c8486e8b4c8a9203279956b768d604bca67f384df775a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Jens Norkaer Sorensen\, Dept. of Mechanical Engineering\, T
 echnical University of Denmark\nThe wake behind a rotor consists essential
 ly of a number of helical vortices that owing to roll-up effects mainly co
 ncentrates in tip and root vortices. Near wake features are related to the
  genesis of the vortex system where the presence of the rotor is felt dire
 ctly. The far wake is usually the downstream position where the wake dynam
 ics no longer depends on the rotor characteristics. In the past decade we 
 have been studying wakes behind wind turbine blades using analytical tools
  as well as numerical simulations based on LES methodology and various ver
 sions of the immersed boundary technique\, such as the actuator line. In t
 he presentation we show that helical wakes are inherent unstable and demon
 strate how the ambient turbulence influences the stability properties. Fur
 thermore\, we identify one of the main instability mechanisms to be relate
 d to vortex pairing. Another part of the work is focused on the interactio
 n of wakes originating from two or more rotors placed close to each other.
  This is in particular of importance for wind turbines located in wind far
 ms. In the presentation\, we show some basic results from the stability an
 alysis as well as numerical simulations of single wakes and interacting wa
 kes\, including comparisons to experimental results.
LOCATION:GR A3 31 http://plan.epfl.ch/?room=GR%20A3%2031
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR