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UID:news2044@dmi.unibas.ch
DTSTAMP;TZID=Europe/Zurich:20260526T151013
DTSTART;TZID=Europe/Zurich:20260603T145000
SUMMARY:An Afternoon of Fluid Dynamics: Augusto Del Zotto (University of Zu
 rich)
DESCRIPTION:We exhibit an incompressible velocity field on the two-dimensio
 nal unit sphere such that the time evolution of any mean-free initial data
  passively advected by the velocity field is mixed exponentially fast. In 
 the presence of molecular diffusivity\, we show that the solution to the a
 ssociated advection-diffusion equation experiences enhanced dissipation wi
 th optimal decay rates. The mixing velocity field is an alternating combin
 ation of two Rossby-Haurwitz flows with random amplitudes and constitutes 
 a spherical analogue to the sine shear-alternating example of Pierrehumber
 t. This is a joint work with Marc Nualart (ICMAT). 
X-ALT-DESC:<p>We exhibit an incompressible velocity field on the two-dimens
 ional unit sphere such that the time evolution of any mean-free initial da
 ta passively advected by the velocity field is mixed exponentially fast. I
 n the presence of molecular diffusivity\, we show that the solution to the
  associated advection-diffusion equation experiences enhanced dissipation 
 with optimal decay rates. The mixing velocity field is an alternating comb
 ination of two Rossby-Haurwitz flows with random amplitudes and constitute
 s a spherical analogue to the sine shear-alternating example of Pierrehumb
 ert. This is a joint work with Marc Nualart (ICMAT).&nbsp\;</p>
DTEND;TZID=Europe/Zurich:20260603T154000
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