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UID:6@aero.iisc.ac.in
DTSTART;TZID=Asia/Kolkata:20190222T160000
DTEND;TZID=Asia/Kolkata:20190222T180000
DTSTAMP:20221124T122229Z
URL:https://aero.iisc.ac.in/events/assessment-of-resolvent-analysis-as-a-t
 ool-for-active-flow-control-design/
SUMMARY:Assessment of resolvent analysis as a tool for active flow control 
 design
DESCRIPTION:Simon Tödtli\nGraduate Aerospace Laboratories\nCalifornia Inst
 itute of Technology\n\n\nReducing turbulent drag on engineering surfaces s
 uch as ship hulls or pipes has the potential of tremendous energetic savin
 gs. However\, tractable and efficient flow models for designing drag reduc
 tion mechanisms\, such as active feedback flow control or compliant surfac
 es\, are currently missing in the literature. This talk describes a flow m
 odel (Luhar et al\, J. Fluid Mech. 2014) based on the resolvent analysis 
 of McKeon &amp\; Sharma (J. Fluid Mech. 2010) and assesses its potential 
 for designing active feedback flow control schemes for drag reduction in i
 ncompressible wall-bounded flows. The assessment is based on a generalized
  version of the well-known opposition control scheme (Choi et al\, J Fluid
  Mech. 1994)\, which allows for a phase-shift between the sensor measurem
 ent and the actuator response. The resolvent model predicts that the phase
  shift strongly affects the attainable drag reduction and suggests that a 
 range of nonzero phases offer improved control effectiveness. We validate 
 these predictions by means of a parametric DNS study and show that the res
 ponse of the full nonlinear system to opposition control with various phas
 e shifts very closely follows the low-order model predictions. We close wi
 th a short discussion of the structural features of various controlled flo
 ws\, which provide first insights into the role of the phase in the real f
 low and the physics of drag reduction.\n\n
CATEGORIES:Seminar Series
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