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UID:4@aero.iisc.ac.in
DTSTART;TZID=Asia/Kolkata:20190213T160000
DTEND;TZID=Asia/Kolkata:20190213T170000
DTSTAMP:20221124T122541Z
URL:https://aero.iisc.ac.in/events/by-pass-transition-and-re-laminarizatio
 n-two-sides-of-the-same-coin/
SUMMARY:By-pass transition and re-laminarization - Two sides of the same co
 in
DESCRIPTION:Name of the Speaker:  Prof. Garry Brown\, Dept. of Mechanic
 al and Aerospace Engineering\, Princeton University\n\nTitle: By-pass tr
 ansition and re-laminarization - Two sides of the same coin\n\nDate &amp\;
  Time: Wednesday\, 13 February 2019\, 4:00 - 5:00 PM\n\nVenue: Auditori
 um\, Department of Aerospace Engineering\, IISc\, Bangalore\n\nAbstract:\n
 \nTransition and re-laminarization are good examples of the complexity of 
 many technologically important flows for which predictions from the physic
 s are needed.  Two routes to ‘transition’ for a laminar boundary laye
 r are well-known: one\, the classical route via amplifying Tollmien-Schlic
 hting (T-S) instability waves (and the onset and merging of ‘turbulent s
 pots’)\, the other\, ‘By-pass’ transition\, (a description coined by
  Morkovin for the absence of amplifying T-S waves). Boundary layer transit
 ion has been identified with a rapid increase in wall shear stress (and he
 at-transfer) but details of the actual mechanisms by which the wall shear 
 stress increases have been elusive.  The talk will describe new insights 
 into ‘roughness induced transition’\, (characteristic of Bypass transi
 tion).  In particular it will describe from a vorticity point of view a f
 inal phase which leads to chaotic vorticity (characteristic of turbulence)
  and a rapid increase in the shear stress at the wall in the absence of an
 y 2D T-S waves.  The unravelling of what occurs is based on the vorticity
  transport near the wall (which was elucidated initially by numerical stud
 ies of turbulent channel flow).  A similar point of view\, but applied to
  the ‘opposite side of the same coin’\, namely\, ‘re-laminarization
 ’ has allowed new insights into why re-laminarization occurs in a spatia
 l turbulent boundary layer subject to a highly favourable pressure gradien
 t.  It has also been found not to occur in a temporal\, boundary layer (R
 ayleigh flow) having the same initial  and subject to a rapid acceleratio
 n of the plate (also a source of spanwise vorticity)\, which is comparable
  with the acceleration of the free stream flow in the spatial case.  The 
 reason for the different behavior is described and readily appreciated\n\n
 Speaker:\n\nProf. Garry Brown is the Emeritus Robert Porter Patterson Pro
 fessor of Engineering at Princeton University. He received a first class H
 onors Degree in Engineering from the University of Adelaide in 1964\, was 
 awarded a Rhodes scholarship\, completed his D.Phil at Oxford and was then
  a research fellow/senior research fellow at GALCIT\, Caltech. In 1971 he 
 returned to the University of Adelaide and in 1978 returned to Caltech as 
 full professor. He was asked to serve as Director of the Australian Aerona
 utical Research Laboratory and held this position from 1981-1990 after whi
 ch he joined the faculty at Princeton\, serving as Chair of the Department
  of Mechanical and Aerospace Engineering from 1990 to 1998. His best known
  work is in the study of turbulence. Fifty years after the inception of th
 e Journal of Fluid Mechanics\, his 1974 paper with Professor Roshko “On 
 density effects and large structure in turbulent mixing layers\,” was th
 e most frequently cited paper in the history of the journal. After joining
  Princeton he explored new research horizons while continuing his abiding 
 interest in turbulence. In 2016 he was the Clark Millikan Visiting Profess
 or at Caltech and taught a course with Professor Roshko and in 2017 he was
  the Satish Dhawan Visiting professor at the Indian Institute of Science i
 n Bangalore where he also taught a course on turbulent shear flows. He has
  also made significant contributions\, as a consultant in Australia and to
  the American aerospace industry\, that include the root cause of extreme 
 propeller-induced-vibration of the Lysaght Enterprise\, the root cause of 
 failure and redesign of the solid rocket motor for the Titan IV\, the caus
 e of early failure and development of the thrust-vectoring system for AIM-
 9X and the resolution of critical issues for Tactical Tomahawk and for the
  Standard Missile-3 Programs. He played a leading role in the failure inve
 stigation and redesign of early air-cooled test cells for the after-burnin
 g F100 engine. He is a Fellow of the Institution of Engineers of Australia
 \, Fellow of the American Physical Society\, and a Fellow of the AIAA\n\nA
 LL ARE WELCOME\n\nHigh Tea @ 5 PM\n\n------------------------------------
 --\n\nP.S. The distinguished lecture series is COMPULSORY for all students
  (both M.Tech and Ph.D.) of the AE department.
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