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SUMMARY:Lagrangian evolution of non-Gaussianity and material deformation i
 n restricted Euler dynamics - Li\, Y (Sheffield)
DTSTART:20080930T164000Z
DTEND:20080930T170000Z
UID:TALK13859@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Small-scale intermittency in fluid turbulence refers to the in
 frequent but strong bursts in the signals of small scale parameters. These
  bursts display highly non-Gaussian statistics\, and its prediction poses 
 serious challenges to turbulence research. Based on the restricted Euler a
 pproximation\, and following the recent idea of tetrad dynamics\, we deriv
 e a simple system of equations for the short-time Lagrangian evolution of 
 velocity and passive scalar increments. The system reproduces several impo
 rtant intermittency trends observed in turbulence. A generalization to rot
 ating turbulence shows that system captures some qualitative effects of ro
 tation. An analytic solution to the material deformation in restricted Eul
 er dynamics\, obtained following the same idea\, is also presented.
LOCATION:Seminar Room 1\, Newton Institute
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