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SUMMARY:Transition to turbulence in Couette-Poiseuille flow
DTSTART:20171205T121500
DTEND:20171205T131500
DTSTAMP:20260917T070532Z
UID:bb247ea4bf8df6552f0a0fafd263773f206a8a4aebf5990722e86c40
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. José Eduardo WESFREID\nIGM Colloquium\n\nWe study the sub
 critical transition to turbulence in the plane Couette-Poiseuille shear fl
 ow with zero mean advection velocity. Our new experimental configuration c
 onsists on one moving wall of the test section (the second one remains sta
 tionary)\, which acts like a driving force for the flow\, imposing linear 
 streamwise velocity profile (Couette) and adverse pressure gradient in the
  streamwise direction (Poiseuille) at the same time.\n\nThis flow is alway
 s linearly stable. The transition to turbulence is forced by a very well c
 ontrolled finite-size perturbation by injection\, into the test section\, 
 of a water jet during a very short time.\n\nWith fluid visualization we ch
 aracterized the mains spatial patterns during transition\, including spots
  and bands.\n\nUsing PIV technique\, we characterized quantitatively the i
 nitial development of the triggered turbulent spot and compared its energy
   evolution with the theoretical predictions of the transient growth theo
 ry.\n\nIn addition\, we show results concerning the importance of nonlinea
 rities\, when waviness of streaks in streamwise direction induced self-sus
 tained process in the turbulent spot.\n\nWe also measured precisely the la
 rge-scale flow which is generated around the turbulent spot and studied it
 s 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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