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SUMMARY:Direct Statistical Simulation of Jet Formation in Local and Global
  Geometries - Tobias\, S (University of Leeds)
DTSTART:20131203T160000Z
DTEND:20131203T164500Z
UID:TALK49144@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Co-author: Brad Marston (Brown University) \n\nWe present Dire
 ct Statistical Simulation (DSS) of jet formation. We consider the simplest
  barotropic model both on a spherical surface and a local beta-plane. DSS 
 involves the direct solution of the low-order statistics via an expansion 
 in cumulants. In both cases we compare the results of our DSS with statist
 ics obtained from long DNS simulations. We discuss in what circumstances t
 runcating the cumulant expansion at second order (thereby including eddy  
 mean-flow interaction but neglecting eddy-eddy interactions for the fluctu
 ating fields) gives a good description of the dynamics of the flow. We dem
 onstrate that this depends on the degree of lack of statistical equilibriu
 m in the flow (as measured by the Zonostrophy parameter). We discuss brief
 ly how to proceed to higher order to include eddy-eddy interactions and th
 e possibility of forward and inverse cascades.\n\n
LOCATION:Seminar Room 1\, Newton Institute
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