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SUMMARY:Large scale features in turbulent pipe and channel flows - Monty\,
  J (New Mexico State)
DTSTART:20080911T134000Z
DTEND:20080911T140000Z
UID:TALK13380@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:In recent years there has been significant progress made towar
 ds understanding t he large-scale structure of wall-bounded shear flows. M
 ost of this work has been conducted with turbulent boundary layers leaving
  scope for further work in pipe s and channels. Here\, the structure of fu
 lly-developed turbulent pipe and channel flow has been studied using custo
 m-made arrays of hot-wire probes. R esults reveal long\, meandering struct
 ures of length up to 25 pipe radii or chann el half-heights. These appear 
 to be qualitatively similar to those reported in t he log region of a turb
 ulent boundary layer. However\, for the channel case\, larg e-scale cohere
 nce persists further from the wall than in boundary layers. Further compar
 ison of the three turbulent flows sh ows that the characteristic structure
  width in the logarithmic region of a bound ary layer is at least 1.6 time
 s smaller than that in a pipe or channel. 
LOCATION:Seminar Room 1\, Newton Institute
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