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SUMMARY:Junior Analysis Seminar –  Augusto Del Zotto (Zurich)
DESCRIPTION:Title\nExponential mixing and enhanced dissipation on the unit 
 sphere via Rossby-Haurwitz flows\nAbstract\nWe exhibit an incompressible v
 elocity field on the two-dimensional unit sphere such that the time evolut
 ion of any mean-free initial data passively advected by the velocity field
  is mixed exponentially fast. In the presence of molecular diffusivity\, w
 e show that the solution to the associated advection-diffusion equation ex
 periences enhanced dissipation with optimal decay rates. The mixing veloci
 ty field is an alternating combination of two Rossby-Haurwitz flows with r
 andom amplitudes and constitutes a spherical analogue to the sine shear-al
 ternating example of Pierrehumbert.\nThis is a joint work with Marc Nualar
 t (ICMAT).\nPlease note that the seminar will take place in person in room
  411 of Huxley Building.\n\nClick here to get to the Junior Analysis Semin
 ar webpage.
URL:https://www.imperial.ac.uk/events/210829/junior-analysis-seminar-august
 o-del-zotto-zurich/
DTSTART;TZID=Europe/London:20260615T140000
DTEND;TZID=Europe/London:20260615T150000
LOCATION:411\, Huxley Building\, South Kensington Campus\, Imperial College
  London\, London\, SW7 2AZ\, United Kingdom
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