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SUMMARY:Making sense of unsteady separation on a wing - Pascal Gehlert\, U
 niversity of Cambridge
DTSTART:20200207T130000Z
DTEND:20200207T140000Z
UID:TALK138403@talks.cam.ac.uk
CONTACT:Connor O'Pray
DESCRIPTION:Rapidly changing flow fields\, for example caused by accelerat
 ing bodies such as flapping wings\, can result in dramatically fluctuating
  force responses. Initially\, added mass effects dominate. As time passes\
 , vorticity created on the body surface\, begins to shed. The growth and a
 dvection of this vorticity subsequently strongly affects the overall force
 s. To quickly predict and model the expected forces much work has gone int
 o understanding this unsteady flow field and to develop low order models. 
 Such models would ideally be able to compute the expected forces within a 
 very short amount of time and a successful implementation of these would a
 llow for gust rejection systems. Micro aerial vehicles\, which are often c
 ompromised by high gust rations and turbulent fluctuations occurring in th
 eir flight envelopes could be one of the main benefactors.\n\nCrucial to t
 his endeavour is the correct prediction of where and when unsteady flow se
 paration occurs as well as the strength of the shed vorticity. This talk w
 ill explore the unsteady development of the boundary layer vorticity of a 
 rotating and surging cylinder through planar particle image velocimetry. T
 hrough this we seek to come closer to being able to predict the location o
 f unsteady separation. The second objective of the talk is to explore the 
 strength at which vorticity is shed. Once more\, this is tackled by analys
 ing the flow field around the circular cylinder. Special attention is paye
 d to the boundary layer vorticity flux and the individual contributions to
  boundary layer vorticity.
LOCATION:LR5\, CUED.
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