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SUMMARY:MechE Colloquium: Transition to turbulence in Couette-Poiseuille f
 low
DTSTART:20171205T121500
DTEND:20171205T131500
DTSTAMP:20260611T053745Z
UID:87e4b77c438199a1d31a00c913c3777ff9849cbf35ebbbd6bad7dc92
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. José Eduardo Wesfreid\, ESPCI\nAbstract:\nWe study the su
 bcritical transition to turbulence in the plane Couette-Poiseuille shear f
 low with zero mean advection velocity. Our new experimental configuration 
 consists on one moving wall of the test section (the second one remains st
 ationary)\, which acts like a driving force for the flow\, imposing linear
  streamwise velocity profile (Couette) and adverse pressure gradient in th
 e streamwise direction (Poiseuille) at the same time.\n\nThis flow is alwa
 ys linearly stable. The transition to turbulence is forced by a very well 
 controlled finite-size perturbation by injection\, into the test section\,
  of a water jet during a very short time.\n\nWith fluid visualization we c
 haracterized the mains spatial patterns during transition\, including spot
 s and bands.\n\nUsing PIV technique\, we characterized quantitatively the 
 initial development of the triggered turbulent spot and compared its energ
 y  evolution with the theoretical predictions of the transient growth the
 ory.\n\nIn addition\, we show results concerning the importance of nonline
 arities\, when waviness of streaks in streamwise direction induced self-su
 stained process in the turbulent spot.\n\nWe also measured precisely the l
 arge-scale flow which is generated around the turbulent spot and studied i
 ts strength as a function of the Reynolds number.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418
STATUS:CONFIRMED
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