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SUMMARY:Timescales and the inertial subrange in wall flows - Prof. Jonatha
 n Morrison. Imperial College\, London
DTSTART:20170428T120000Z
DTEND:20170428T130000Z
UID:TALK72172@talks.cam.ac.uk
CONTACT:Garazi Gomez-de-Segura
DESCRIPTION:The scaling of NSTAP probe data from the Princeton superpipe i
 s examined and compared to both K41 and K62 theories for the inertial subr
 ange.  The comparisons are made at the pipe centre-line and in the logarit
 hmic region\, where in both cases\, the transport equation for the turbule
 nce kinetic energy is really quite simple.  Nonetheless\, single hot-wire 
 data (resolved to less than three Kolmogorov lengthscales) for the streamw
 ise velocity fluctuations show very little agreement with Kolmogorov's the
 ories at lambda-based Reynolds numbers of several hundred.  Reasons for th
 is are put forward and used to introduce a novel experiment in which free-
 stream turbulence\, initially passing over a moving ground plane to produc
 e a shearless boundary layer\, is rapidly sheared on passing to a stationa
 ry surface. Such an arrangement is well suited to examining "top-down" and
  "bottom-up" transport mechanisms in a systematic manner.  Here we focus o
 n the linear (fast) and nonlinear (slow) contributions to static pressure 
 fluctuations\, both in-stream and at the wall.
LOCATION:JDB Seminar Room\, CUED
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