E-224 β平面乱流中における一粒子拡散

概要

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Two spectral approximations for single particle diffusion inβ-plane turbulence are presented. One of them is based on a method parallel to that of the approximation for strongly stratified turbulence by Kaneda and Ishida [J. Fluid Mech. 402 (2000), 311-327], which uses Corrsin's conjecture for the Lagrangian two-time correlation and a linearized approximation for the Eulerian two-time correlation. The other approximation is based on a Lagrangian spectral closure approximation. The analysis is performed for the limit case such that the time scale associated with theβ-term is sufficiently smaller than the time scale associted with the enery-containing eddies. Two approximations are tested against direct numerical simulations (DNS). The latter approximation suggests the suppression of the diffusion along the north-south direction which is in good agreement with the DNS, while the former fails to predict the suppression.
日本流体力学会の論文
2003-07-28