Chaotic Lagrangian models for turbulent relative dispersion
文献类型：期刊论文
| 作者 | Lacorata, G; Vulpiani, A; 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. |
| 刊名 | PHYSICAL REVIEW E
 |
| 出版日期 | 2017 |
| 卷号 | 95期号:4页码:43106 |
| DOI | http://dx.doi.org/10.1103/PhysRevE.95.043106 |
| 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. |
| 学科主题 | Physics |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/22078]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 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. |
| 推荐引用方式 GB/T 7714 | Lacorata, G,Vulpiani, A,Lacorata, G ,et al. Chaotic Lagrangian models for turbulent relative dispersion[J]. PHYSICAL REVIEW E,2017,95(4):43106. |
| APA | Lacorata, G,Vulpiani, A,Lacorata, G ,&Lacorata, G .(2017).Chaotic Lagrangian models for turbulent relative dispersion.PHYSICAL REVIEW E,95(4),43106. |
| MLA | Lacorata, G,et al."Chaotic Lagrangian models for turbulent relative dispersion".PHYSICAL REVIEW E 95.4(2017):43106. |
入库方式： OAI收割
来源：理论物理研究所
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