The Richardson's Law in Large-Eddy Simulations of Boundary Layer flows

Details The Richardson's Law in Large-Eddy Simulations of Boundary Layer flows The Richardson's Law in Large-Eddy Simulations of Boundary Layer flows

2003-09-09

arxiv.org/abs/physics/0309047v1

Physics

Fluid Dynamics

15 LaTex pages, 4 PS figures

Scientific paper

10.1023/B:BOUN.0000039373.45669.

Relative dispersion in a neutrally stratified planetary boundary layer (PBL) is investigated by means of Large-Eddy Simulations (LES). Despite the small extension of the inertial range of scales in the simulated PBL, our Lagrangian statistics turns out to be compatible with the Richardson $t^3$ law for the average of square particle separation. This emerges from the application of nonstandard methods of analysis through which a precise measure of the Richardson constant was also possible. Its values is estimated as $C_2\sim 0.5$ in close agreement with recent experiments and three-dimensional direct numerical simulations.

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