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SUMMARY:Vortex breakdown and wake states in swirling flows
DTSTART:20130409T131500
DTEND:20130409T141500
DTSTAMP:20260510T020850Z
UID:1b9056d5355eaabfa31a009ca961502b3e32d2e5c2d816cbd697aa5f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Jens Nørkær Sørensen\nBio : Jens Nørkær Sørensen i
 s professor of fluid mechanics and the head of fluid mechanics section of 
 the newly established DTU Wind Energy department. His research interests c
 over basic as well as applied topics in fluid mechanics\, such as aerodyna
 mics\, rotating flows\, vortex breakdown\, wind energy and bio fluid mecha
 nics. He received his PhD degree in 1986\, and after a post-doc at ONERA i
 n France he became faculty member at the mechanical engineering department
  at DTU in 1989. He has been full professor since 2001 and in 2012 he move
 d to the new wind energy department. His latest research effort deals with
  rotating flows associated with wakes and vortex breakdown.\nAbstract : Vo
 rtex breakdown is a phenomenon inherent to many practical problems in aero
 dynamics\, geophysics\, and engineering\, such as tip vortices over wings 
 and behind propellers\, atmospheric tornadoes and cyclones\, flame-holder 
 vortices in combustion devices etc. The breakdown of these vortices is ass
 ociated with an abrupt deceleration of the axial velocity on the vortex ax
 is which sometimes develops to a recirculation zone. Although now about te
 n forms of vortex breakdown have been identified\, the gist of the phenome
 non is not yet fully explained.\nIn this presentation I will give some exa
 mples of vortex breakdown\, introduce some of theories explaining the phen
 omenon\, and discuss results from both numerical simulations and experimen
 ts. In particular\, I will show some recent results from stability analysi
 s of helical vortices that may explain the appearance of vortex breakdown 
 with multiple vortices and explain how the phenomenon of vortex breakdown 
 may shed some light on the so-called vortex ring state seen in wakes behin
 d propellers.
LOCATION:ME B3 31 http://plan.epfl.ch/?room=MEB331
STATUS:CONFIRMED
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