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SUMMARY:Triple cascade and zonal flows in beta-plane turbulence - Nazarenk
 o\, S (Warwick)
DTSTART:20081211T103000Z
DTEND:20081211T110000Z
UID:TALK15607@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:At low amplitudes\, the beta-plane model has three conservatio
 n laws: the energy\, the potential enstrophy and the zonostrophy (an addit
 ional invariant found by Balk\, Nazarenko and Zakharov in 1991). Applicati
 on of a standard Fjortoft argument to this system leads to a conclusion th
 at these 3 invariants must cascade in an anisotropic fashion\, each cascad
 e occupying its own sector in the 2D k-space. It appears that the energy c
 ascade sector corresponds to generation of large-scale zonal flows in the 
 system. I will discuss some recent numerics aimed at checking conservation
  of zonostrophy and the triple cascade property.
LOCATION:Seminar Room 1\, Newton Institute
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