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SUMMARY:Receptivity and Instability : Role of Spatio-Temporal Wave Front I
 n Transition
DTSTART:20160223T111500
DTEND:20160223T121500
DTSTAMP:20260916T225839Z
UID:adf200468399659c3ada4f923d2514ff114745543552b97b68d870fa
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Tapan K. Sengupta\, IIT Kanpur\nBio: High Performance Co
 mputing Laboratory at the Aerospace Engineering Department of I.I.T. Kanpu
 r - started by Prof. Tapan K Sengupta\, has been an active place of resear
 ch right from its inception in 1990. The emphasis of research is on develo
 ping high accuracy computing methods to aid in bridging the gap between th
 eoretical and computational fluid dynamics and heat transfer.\nTo understa
 nd the unit process(es) of transition to turbulence via two- and three-dim
 ensional routes of low amplitude disturbance growth over a zero pressure g
 radient boundary layer (ZPG-BL) remains the canonical problem. There are n
 umerous attempts to understand the process for ZPG-BL. In the present talk
 \, results obtained from solutions of Navier-Stokes equation and its linea
 rized parallel flow version will be presented which reproduce classical ex
 periment of Schubauer-Skramstad (1947). The experiments used low disturban
 ce tunnel at NBS and imposed deterministic harmonic excitation inside the 
 shear layer. This scenario was studied in Sengupta and Bhaumik [Phys. Rev.
  Lett. 107\, 154501 (2011)]\, where a route of transition to fully develop
 ed turbulent stage was explained for 2D disturbances in terms of the spati
 o-temporal wave-front (STWF). The STWF was earlier identified as the unit 
 process by theoretical receptivity solution of Orr-Sommerfeld equation by 
 Bromwich contour integral method in Sengupta et al. [Phys. Rev. Lett. 96\,
  224504 (2006)] as due to spatiotemporal instability. Of late\, we have re
 ported the same process of the STWF for transition involving 3D disturbanc
 e field from DNS. These findings show the importance of STWF over Tollmien
 -Schlichting waves\, which was considered central for flow transition by l
 ow amplitude disturbances.
LOCATION:Room MAA110 http://plan.epfl.ch/?room=MA%20A1%2010
STATUS:CONFIRMED
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