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SUMMARY:Mean flow and fluctuations in two opposing limits of quasi-geostro
 phic flow - Anna Frishman (Technion - Israel Institute of Technology)
DTSTART:20220518T111500Z
DTEND:20220518T121500Z
UID:TALK173567@talks.cam.ac.uk
DESCRIPTION:Persistent large scale flows in geophysical and astrophysical 
 settings are often sustained by small scale turbulence\, rather than the o
 ther way around. I will discuss two idealized settings where analytical pr
 ogress on such mean-flow-turbulence interactions and statistics is possibl
 e. &nbsp\;\nNamely\, I will compare and contrast the steady state statisti
 cs in two limits of the shallow water quasi-geostrophic equation (absent d
 ifferential rotation): the limit of infinite deformation radius\, correspo
 nding to 2D Navier-Stokes\, and that of zero deformation radius\, called t
 he asymptotic model. For both\, I will present analytical results rooted i
 n the quasi-linear approximation\, along with supporting evidence from dir
 ect numerical simulations. I will also show some surprising features of th
 e asymptotic model\, including the influence of the inverse energy transfe
 r on the direct cascade.
LOCATION:Seminar Room 1\, Newton Institute
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