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SUMMARY:The effect of rotation on the dynamo threshold at the low Pm limit
  - Vassilios Dallas (Leeds)
DTSTART:20170522T150000Z
DTEND:20170522T160000Z
UID:TALK71816@talks.cam.ac.uk
CONTACT:Robert Teed
DESCRIPTION:In this seminar I will show that the critical magnetic Reynold
 s number Rm_c for a turbulent non-helical dynamo in the low magnetic Prand
 tl number Pm limit can be significantly reduced if the flow is submitted t
 o global rotation. Even for moderate rotation rates the required energy in
 jection rate can be reduced by a factor more than 10^3. This strong decrea
 se of the onset is attributed to the reduction of the turbulent fluctuatio
 ns that makes the flow to have a much larger cut-off length-scale compared
  to a non-rotating flow of the same Reynolds number. The dynamo thus behav
 es as if it is driven by laminar behaviour (i.e. high Pm behaviour) even a
 t high values of the Reynolds number (i.e. at low values of Pm). Our findi
 ng thus points into a new paradigm for the design of new liquid metal dyna
 mo experiments.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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