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CATEGORIES:Engineering Fluids Group Seminar
SUMMARY:Feedback control of a turbulent bluff body wake fo
 r efficient  drag reduction - Mr. Rowan Brackston\
 , Imperial College\, London
DTSTART;TZID=Europe/London:20170317T130000
DTEND;TZID=Europe/London:20170317T140000
UID:TALK70387AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/70387
DESCRIPTION:Many road vehicles such as cars and lorries are no
 t shaped \nin an aerodynamically efficient manner 
 due to aesthetic\, practical and \nlegal constrain
 ts. Such vehicles are often classified as bluff bo
 dies\, \nand consequently have a large three-dimen
 sional wake which contributes \nsignificantly to t
 he aerodynamic drag on these vehicles. While many 
 \npassive and active methods exist to reduce the d
 rag of 3D bluff \nbodies\, they generally involve 
 either large geometric changes or high \nenergy co
 nsumption. An alternative method involves the use 
 of feedback \ncontrol and small actuators to effic
 iently regulate key features of \nthe wake.\n\n In
  this talk we will discuss the development of feed
 back control \nstrategies that are experimentally 
 implemented on a high Reynolds \nnumber bluff body
  wake. This first involves an assessment of the wa
 ke \nobservability to determine which features of 
 the wake may be robustly \nmeasured from body moun
 ted pressure data alone. A second stage is the \nd
 evelopment of stochastic models that describe key 
 features of the \nwake and provide insight for fee
 dback control design. These feedback \ncontrollers
  are then implemented\, demonstrating that efficie
 nt drag \nreduction is possible\, but that the con
 trol can be challenged by \nfundamental limitation
 s.\n
LOCATION:JDB Seminar Room\, CUED
CONTACT:Akshath Sharma
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