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SUMMARY:Thermal vortex rings: the vortex dynamics - Dr Jun-Ichi Yano\, Uni
 versity of Reading
DTSTART:20250613T150000Z
DTEND:20250613T160000Z
UID:TALK231022@talks.cam.ac.uk
CONTACT:Professor Grae Worster
DESCRIPTION:A thermal is a convective structure generated from a localized
  buoyancy anomaly\, say\, released from the surface. Since it evolves into
  a donuts-shaped vorticity\, the vortex ring\, it may be more precisely ca
 lled the thermal vortex ring.  Thermals are often considered basic element
 s of fully-developed convection in astrophysical and geophysical flows\, a
 s most vividly visualized by a cauliflower-like structure of cumulus-conve
 ctive clouds. This talk revisits the problem of the thermal vortex ring fr
 om a point of view of the vortex dynamics. More specifically\, I present: 
 1) a modon solution of a thermal vortex ring as an extension of Hill's vor
 tex\; 2) a concise description based on the volume integrals of the vortic
 ity weighted by a power of the distance from the vortex-ring axis\; 3) der
 ivation of a classical similarity solution based on it\, as well as 4) a d
 evelopment of a closed system based on an explicit simulation. Those inves
 tigations as a whole suggest that the thermal vortex ring could be interpr
 eted as a type of two-dimensional turbulence.
LOCATION:MR2
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