Turbulent relative dispersion in two-dimensional free convection turbulence

被引：7

作者：

Ogasawara, Takeshi ^{[1
]}

Toh, Sadayoshi ^{[1
]}

机构：

[1] Kyoto Univ, Grad Sch Sci, Div Phys Astron, Kyoto 6068502, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2006年 / 75卷 / 10期

关键词：

turbulence; turbulent relative dispersion; exit-time; free convection; DNS;

D O I：

10.1143/JPSJ.75.104402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The relative dispersion process in two-dimensional free convection turbulence is investigated by direct numerical simulation. In the inertial range, the growth of relative separation, r, is expected as < r(2) (t)> proportional to t(5) according to the Bolgiano-Obukhov scaling. The result supporting the scaling is obtained with exit-time statistics. Detailed investigation of exit-time PDF shows that the PDF is divided into two regions, the Region-I and -II, reflecting two types of separating processes: persistent expansion and random transitions between expansion and compression of relative separation. This is consistent with the physical picture of the self-similar telegraph model. In addition, a method for estimating the parameters of the model are presented. Comparing two turbulence cases, two-dimensional free convection and inverse cascade turbulence, the relation between the drift term of the model and nature of coherent structures is discussed.

引用

页数：12

共 22 条

[1] Dispersion of passive tracers in closed basins: Beyond the diffusion coefficient [J].

Artale, V ;

Boffetta, G ;

Celani, A ;

Cencini, M ;

Vulpiani, A .

PHYSICS OF FLUIDS, 1997, 9 (11) :3162-3171

[2] THE APPLICATION OF THE SIMILARITY THEORY OF TURBULENCE TO ATMOSPHERIC DIFFUSION [J].

BATCHELOR, GK .

QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, 1950, 76 (328) :133-146

[3] THE EFFECT OF HOMOGENEOUS TURBULENCE ON MATERIAL LINES AND SURFACES [J].

BATCHELOR, GK .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1952, 213 (1114) :349-&

[4] Relative dispersion in fully developed turbulence: The Richardson's law and intermittency corrections [J].

Boffetta, G ;

Sokolov, IM .

PHYSICAL REVIEW LETTERS, 2002, 88 (09) :4

[5] Statistics of two-particle dispersion in two-dimensional turbulence [J].

Boffetta, G ;

Sokolov, IM .

PHYSICS OF FLUIDS, 2002, 14 (09) :3224-3232

[6] Pair dispersion in synthetic fully developed turbulence [J].

Boffetta, G ;

Celani, A ;

Crisanti, A ;

Vulpiani, A .

PHYSICAL REVIEW E, 1999, 60 (06) :6734-6741

[7] Richardson's pair diffusion and the stagnation point structure of turbulence -: art. no. 144501 [J].

Dávila, J ;

Vassilicos, JC .

PHYSICAL REVIEW LETTERS, 2003, 91 (14)

[8] Two-particle dispersion in turbulentlike flows [J].

Fung, JCH ;

Vassilicos, JC .

PHYSICAL REVIEW E, 1998, 57 (02) :1677-1690

[9] Particle pair diffusion and persistent streamline topology in two-dimensional turbulence [J].

Goto, S ;

Vassilicos, JC .

NEW JOURNAL OF PHYSICS, 2004, 6 :1-35

[10] Relative diffusion of a pair of fluid particles in the inertial subrange of turbulence [J].

Ishihara, T ;

Kaneda, Y .

PHYSICS OF FLUIDS, 2002, 14 (11) :L69-L72

← 1 2 3 →