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SUMMARY:Jet Flow in a Rotating Fluid - Prof Peter Thomas (University of Wa
 rwick)
DTSTART:20190308T130000Z
DTEND:20190308T140000Z
UID:TALK117637@talks.cam.ac.uk
CONTACT:Amélie Lamarquette
DESCRIPTION:An experimental study investigating the dynamics of a turbulen
 t jet developing subject to Coriolis effects induced in a rotating fluid i
 s summarized. The program appears to be the first PIV study of this type o
 f flow. The measurements reveal how Coriolis effects substantially alter t
 he flow dynamics of the jet in comparison to its non-rotating counterpart.
  In particular\, the measurements confirm the existence of a time-periodic
  formation-breakdown cycle of the jet that was computationally predicted b
 y Lawrie et al. (2011\, J. Phys.: Conf. Ser. 318\, 032048). \n\nThe data a
 nalysis shows that the frequency of the formation-breakdown cycle increase
 s linearly with the background rotation rate. The onset of the breakdown p
 hase and of the reformation phase of the cycle can be characterized in ter
 ms of a local Rossby number employing an internal velocity and associated 
 length scale of the jet. The critical values for this local Rossby number\
 , for onset of breakdown and reformation\, scale linearly with a global Ro
 ssby number based on the flow conditions at the source. The analysis of th
 e experimental data points towards centrifugal instability as the potentia
 l origin of the formation-breakdown cycle.\n
LOCATION:JDB Seminar Room\, CUED
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