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UID:20250808T164902EDT-7608vWjU6t@132.216.98.100
DTSTAMP:20250808T204902Z
DESCRIPTION:Unsteady flow barriers at scales from geophysics to microfluidi
 cs: identification\, control\, and optimizing transport\n\nAbstract:Unstea
 dy flows typically contain clumps of particles moving coherently\, in addi
 tion to regions in which extensive mixing occurs. The boundaries of each o
 f these regions might be considered as 'unsteady flow barriers\,' since th
 ey move about in time. Exactly defining what these are is\, however\, prob
 lematic. Such flow barriers may be thought to demarcate geophysical featur
 es such as the Antarctic Circumpolar Vortex (ozone hole)\, or the interfac
 e between two fluids that one desires to mix together for DNA synthesis in
  a microfluidic device. This talk will examine several theoretical issues 
 and applications arising from attempting to understand\, and use\, unstead
 y flow barriers. The relationship to stable and unstable manifolds of hype
 rbolic trajectories in nonautonomous dynamical systems will be established
 . Using the solution to the energy-constrained optimization problem of max
 imizing mixing between two fluids across their mutual interface\, an optim
 um design for a cross-channel micromixer is proposed. Ongoing work on mani
 pulating flow barriers according to a user-defined unsteady prescription i
 s presented\; this offers an exciting new tool for flow control. Additiona
 lly\, some emerging work on how these ideas can be used to correct errors 
 in oceanic velocity data obtained from satellite observations will be brie
 fly discussed.\n\n\n\n
DTSTART:20161205T200000Z
DTEND:20161205T210000Z
LOCATION:Room 920\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Sanjeeva Balasuriya\, University of Adelaide
URL:/mathstat/channels/event/sanjeeva-balasuriya-unive
 rsity-adelaide-264597
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