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SUMMARY:Multiphase dynamics near a single vortex\, and its relevance to tu
 rbulence - Rama Govindarajan (International Centre for Theoretical Science
 s\, TIFR\, Bangalore)
DTSTART:20220310T133000Z
DTEND:20220310T143000Z
UID:TALK170717@talks.cam.ac.uk
DESCRIPTION:A basic difference between single-fluid and two-fluid turbulen
 ce will be discussed. In the flow of two immiscible fluids\, surface tensi
 on acts to create vorticity on a general interface. The interface then is 
 subject to Kelvin-Helmholtz instability. This dynamics can be calculated a
 nalytically near a single vortex\, beginning with a flat interface. Three 
 kinds of instability are seen: a core Kelvin-Helmholtz (KH) instability du
 e to surface tension\, and also a spiral KH instability and a centrifugal 
 Rayleigh Taylor instability due to the density difference between the flui
 ds. In 2D turbulence\, these mechanisms are shown to significantly increas
 e the energy at small scales.
LOCATION:Seminar Room 1\, Newton Institute
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