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题名: Chaotic Lagrangian models for turbulent relative dispersion
作者: Lacorata, G ;  Vulpiani, A
刊名: PHYSICAL REVIEW E
出版日期: 2017
卷号: 95, 期号:4, 页码:43106
学科分类: Physics
DOI: http://dx.doi.org/10.1103/PhysRevE.95.043106
通讯作者: Lacorata, G (reprint author), CNR, Ist Sci Atmosfera & Clima, Via Monteroni, I-73100 Lecce, Italy. ;  Lacorata, G (reprint author), Univ Aquila, Ctr Excellence CETEMPS, Via Vetoio, I-67100 Coppito, AQ, Italy.
文章类型: Article
英文摘要: A deterministic multiscale dynamical system is introduced and discussed as a prototype model for relative dispersion in stationary, homogeneous, and isotropic turbulence. Unlike stochastic diffusion models, here trajectory transport and mixing properties are entirely controlled by Lagrangian chaos. The anomalous "sweeping effect," a known drawback common to kinematic simulations, is removed through the use of quasi-Lagrangian coordinates. Lagrangian dispersion statistics of the model are accurately analyzed by computing the finite-scale Lyapunov exponent (FSLE), which is the optimal measure of the scaling properties of dispersion. FSLE scaling exponents provide a severe test to decide whether model simulations are in agreementwith theoretical expectations and/or observation. The results of our numerical experiments cover a wide range of "Reynolds numbers" and show that chaotic deterministic flows can be very efficient, and numerically low-cost, models of turbulent trajectories in stationary, homogeneous, and isotropic conditions. The mathematics of the model is relatively simple, and, in a geophysical context, potential applications may regard small-scale parametrization issues in general circulation models, mixed layer, and/or boundary layer turbulence models as well as Lagrangian predictability studies.
类目[WOS]: Physics, Fluids & Plasmas ;  Physics, Mathematical
关键词[WOS]: PAIR DISPERSION ;  SIMULATIONS ;  TRANSPORT ;  FLOWS ;  PREDICTABILITY ;  DIFFUSION ;  OCEAN
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/22078
Appears in Collections:理论物理所2017年知识产出_期刊论文

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Lacorata, G,Vulpiani, A. Chaotic Lagrangian models for turbulent relative dispersion[J]. PHYSICAL REVIEW E,2017,95(4):43106.
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