BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Skin-friction drag reduction in turbulent flows: how to set up the
  flow control problem - Maurizio Quadrio (Department of Aerospace Sciences
  and Technologies\, Politecnico di Milano)
DTSTART:20190620T100000Z
DTEND:20190620T110000Z
UID:TALK126379@talks.cam.ac.uk
CONTACT:Amélie Lamarquette
DESCRIPTION:The talk will describe the rational set up of a fundamental fl
 ow control problem\, where active flow control is used to reduce turbulent
  skin-friction drag in an indefinite plane channel.\nThe proper way of acc
 ounting for the energy cost of the control\, as well as the cor- rect obje
 ctive function in an optimization procedure\, will be identified and discu
 ssed. The framework builds upon the Constant Power Input (CPI) concept\, t
 hat we have re- cently introduced as a viable alternative to compare diffe
 rent flows under flow control. With CPI\, at statistical equilibrium each 
 flow has the same global energy flux per unit time\, hence the same total 
 energy dissipation rate.\nA new decomposition of the total dissipation is 
 introduced\, stemming from an ex- tended Reynolds decomposition\, where th
 e mean velocity is split into a laminar com- ponent and a deviation from i
 t. The figure below shows for the most general case the different energy f
 luxes of Mean Kinetic Energy (MKE) and Turbulent Kinetic Energy (TKE).
LOCATION:LR3A\, CUED
END:VEVENT
END:VCALENDAR