Articles | Volume 14, issue 2
Nonlin. Processes Geophys., 14, 139–151, 2007
https://doi.org/10.5194/npg-14-139-2007
Nonlin. Processes Geophys., 14, 139–151, 2007
https://doi.org/10.5194/npg-14-139-2007

  28 Mar 2007

28 Mar 2007

Particle dispersion processes in two-dimensional turbulence: a comparison with 2-D kinematic simulation.

R. Castilla1, J. M. Redondo2, P. J. Gámez-Montero1, and A. Babiano3 R. Castilla et al.
  • 1LABSON, Dpt. of Fluid Mechanics, U.P.C., Spain
  • 2Dpt. of Applied Physics, U.P.C., Spain
  • 3CNRS, Laboratoire de Météorologie Dinamique, Ecole Normale Superieur, France

Abstract. We study numerically the comparison between Lagrangian experiments on turbulent particle dispersion in 2-D turbulent flows performed, on the one hand, on the basis of direct numerical simulations (DNS) and, on the other hand, using kinematic simulations (KS). Eulerian space-time structure of both DNS and KS dynamics are not comparable, mostly due to the absence of strong coherent vortices and advection processes in the KS fields. The comparison allows to refine past studies about the contribution of non-homogeneous space-time 2-D Eulerian structure on the turbulent absolute and relative particle dispersion processes. We particularly focus our discussion on the Richardson's regime for relative dispersion.

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