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SUMMARY:Lagrangian acceleration in confined 2d turbulent flow - Schneider\
 , K (Universite de Provence\, Marseille)
DTSTART:20081002T150000Z
DTEND:20081002T153000Z
UID:TALK13866@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:A Lagrangian study of two-dimensional turbulence for two diffe
 rent geometries\, a periodic and a confined circular geometry\, is present
 ed to investigate the influence of solid boundaries on the Lagrangian dyna
 mics. It is found that the Lagrangian acceleration is even more intermitte
 nt in the confined domain than in the periodic domain. The flatness of the
  Lagrangian acceleration as a function of the radius shows that the influe
 nce of the wall on the Lagrangian dynamics becomes negligible in the cente
 r of the domain and it also reveals that the wall is responsible for the i
 ncreased intermittency. The transition in the Lagrangian statistics betwee
 n this region\, not directly influenced by the walls\, and a critical radi
 us which defines a Lagrangian boundary layer\, is shown to be very sharp w
 ith a sudden increase of the acceleration flatness from about 5 to about 2
 0.\n\nRelated Links\n    * http://arxiv.org/PS_cache/arxiv/pdf/0802/0802.3
 139v1.pdf - PDF file of a preprint to appear in PRL\n
LOCATION:Seminar Room 1\, Newton Institute
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