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SUMMARY:Feedback control of a turbulent bluff body wake for efficient  dra
 g reduction - Mr. Rowan Brackston\, Imperial College\, London
DTSTART:20170317T130000Z
DTEND:20170317T140000Z
UID:TALK70387@talks.cam.ac.uk
CONTACT:Akshath Sharma
DESCRIPTION:Many road vehicles such as cars and lorries are not shaped \ni
 n an aerodynamically efficient manner due to aesthetic\, practical and \nl
 egal constraints. Such vehicles are often classified as bluff bodies\, \na
 nd consequently have a large three-dimensional wake which contributes \nsi
 gnificantly to the aerodynamic drag on these vehicles. While many \npassiv
 e and active methods exist to reduce the drag of 3D bluff \nbodies\, they 
 generally involve either large geometric changes or high \nenergy consumpt
 ion. An alternative method involves the use of feedback \ncontrol and smal
 l actuators to efficiently regulate key features of \nthe wake.\n\n In thi
 s talk we will discuss the development of feedback control \nstrategies th
 at are experimentally implemented on a high Reynolds \nnumber bluff body w
 ake. This first involves an assessment of the wake \nobservability to dete
 rmine which features of the wake may be robustly \nmeasured from body moun
 ted pressure data alone. A second stage is the \ndevelopment of stochastic
  models that describe key features of the \nwake and provide insight for f
 eedback control design. These feedback \ncontrollers are then implemented\
 , demonstrating that efficient drag \nreduction is possible\, but that the
  control can be challenged by \nfundamental limitations.\n
LOCATION:JDB Seminar Room\, CUED
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