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UID:0-235@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20210623T163000

DTEND;TZID=Asia/Jerusalem:20210623T173000

DTSTAMP:20230410T063653Z

URL:https://aerospace.technion.ac.il/events/merchav-prize-seminar-a-nonlin
 ear-diagnostic-for-scale-interactions-in-turbulent-flows/

SUMMARY:Merchav Prize Seminar | A Nonlinear Diagnostic for Scale Interactio
 ns in Turbulent Flows
DESCRIPTION:Lecturer:Guangyao Cui\n Faculty:Department of Aerospace Enginee
 ring\n Institute:Technion – Israel Institute of Technology\n Location:Cl
 assroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract:
  \n Details: \n Turbulent flows are composed of a wide range of large- and
  small-scale coherent motions. These motions are responsible for practical
  engineering effects\, like the generation of turbulent drag. Scale intera
 ctions between large- and small-scales in turbulent wall-bounded flows hav
 e historically been investigated by linear analysis which requires a filte
 ring and envelope procedure. The phase delay between large and envelope of
  small scales was explained as a spatial delay in the flow. However\, the 
 linear analysis depends on the cutoff wavelength in the filtering process 
 and the use of an artificial envelope of small scales that does not exist 
 in real data. The Fourier transformed momentum equation shows that only th
 e nonlinear advection term contributes to the interaction among different 
 scales and thus all interactions occur in triads. A nonlinear diagnostic\,
  the bispectrum\, is introduced and applied to a numerical turbulent chann
 el flow. The bispectrum shows that large-scale structure that is most stro
 ngly coupled\, in a triadic sense\, to small scales\, is the very-large-sc
 ale-motion (VLSM). The phase of the bispectrum\, the biphase\, shows that 
 there is an interaction delay in the triadic interaction. This will help t
 o understand the scale interactions better and hopefully shed some light o
 n the flow control in the turbulent boundary layers.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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