Caustics and clustering in the vicinity of a vortex

被引：31

作者：

Ravichandran, S. ^{[1
]}

Govindarajan, Rama ^{[1
]}

机构：

[1] Tata Inst Fundamental Res, TIFR Ctr Interdisciplinary Sci, Hyderabad 500075, Andhra Pradesh, India

来源：

PHYSICS OF FLUIDS | 2015年 / 27卷 / 03期

关键词：

INERTIAL PARTICLES; PREFERENTIAL CONCENTRATION; HEAVY-PARTICLES; TURBULENT FLOWS; FIELDS; COLLISIONS; DROPLETS; DYNAMICS;

D O I：

10.1063/1.4916583

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

We study the formation of caustics in vortex-dominated flows. We find that only particles starting within a critical distance of a vortex which scales as the square roots of the particle inertia and the circulation can form sling caustics. We show that particles starting in an annular region around this critical radius contribute the densest clusters in the flow. The large density spikes occurring for such particles, even at small inertia, are indicative that these particles will experience large collision rates. (C) 2015 AIP Publishing LLC.

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页数：13

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