Single-particle dispersion in stably stratified turbulence

被引：6
|
作者：
Sujovolsky, N. E. [1 ,2 ]
Mininni, P. D. [1 ,2 ]
Rast, M. P. [3 ]
机构：
[1] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Fis, RA-1428 Buenos Aires, DF, Argentina
[2] Ciudad Univ, CONICET, IFIBA, RA-1428 Buenos Aires, DF, Argentina
[3] Univ Colorado, Dept Astrophys & Planetary Sci, Lab Atmospher & Space Phys, Boulder, CO 80309 USA
来源：
PHYSICAL REVIEW FLUIDS | 2018年 / 3卷 / 03期
关键词：
INTERNAL WAVES; WIND SHEAR; DIFFUSION; FLUID; FLOWS; SUPPRESSION; SCALES;
D O I：
10.1103/PhysRevFluids.3.034603
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
We present models for single-particle dispersion in vertical and horizontal directions of stably stratified flows. The model in the vertical direction is based on the observed Lagrangian spectrum of the vertical velocity, while the model in the horizontal direction is a combination of a continuous-time eddy-constrained random walk process with a contribution to transport from horizontal winds. Transport at times larger than the Lagrangian turnover time is not universal and dependent on these winds. The models yield results in good agreement with direct numerical simulations of stratified turbulence, for which single-particle dispersion differs from the well-studied case of homogeneous and isotropic turbulence.
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页数：17
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