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SUMMARY:Linear analysis to understand the formation of coherent structures
  in wall turbulence - Vikrant Gupta\, CUED
DTSTART:20140214T130000Z
DTEND:20140214T140000Z
UID:TALK47474@talks.cam.ac.uk
CONTACT:Dr Henry Burridge
DESCRIPTION:High Reynolds number flows are common in industrial applicatio
 ns as well as in daily life. These flows are characterized by stochastic p
 erturbations\, and need a constant source of energy to sustain themselves.
  I use low order models to understand the formation of coherent structures
  in wall-bounded flows. I will mainly discuss two canonical flow cases: tu
 rbulent channel flow and rotating pipe flow. Firstly\, I will show why nea
 r-wall streaks\, though turbulent\, always have spanwise spacing of 100 wa
 ll units. Secondly\, I will discuss the formation of large and very large 
 scale motions in wall turbulence. Thirdly\, I will discuss how rotation in
  pipe causes drag reduction. Fourthly\, I will discuss improving the low o
 rder models by using turbulence models.
LOCATION:LR3B\, Inglis Building\, CUED.
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