dorsal/arxiv
View SchemaPassive Tracer Dynamics in 4 Point-Vortex Flow
| Authors | A. Laforgia, X. Leoncini, L. Kuznetsov, G. M. Zaslavsky |
|---|---|
| Categories | |
| ArXiv ID | physics/0009097 |
| URL | https://arxiv.org/abs/physics/0009097 |
| DOI | 10.1007/s100510170261 |
| Journal | Eur. Phys. J. B 20, 427-440 (2001) |
Abstract
The advection of passive tracers in a system of 4 identical point vortices is studied when the motion of the vortices is chaotic. The phenomenon of vortex-pairing has been observed and statistics of the pairing time is computed. The distribution exhibits a power-law tail with exponent $\sim 3.6$ implying finite average pairing time. This exponents is in agreement with its computed analytical estimate of 3.5. Tracer motion is studied for a chosen initial condition of the vortex system. Accessible phase space is investigated. The size of the cores around the vortices is well approximated by the minimum inter-vortex distance and stickiness to these cores is observed. We investigate the origin of stickiness which we link to the phenomenon of vortex pairing and jumps of tracers between cores. Motion within the core is considered and fluctuations are shown to scale with tracer-vortex distance $r$ as $r^{6}$. No outward or inward diffusion of tracers are observed. This investigation allows the separation of the accessible phase space in four distinct regions, each with its own specific properties: the region within the cores, the reunion of the periphery of all cores, the region where vortex motion is restricted and finally the far-field region. We speculate that the stickiness to the cores induced by vortex-pairings influences the long-time behavior of tracers and their anomalous diffusion.
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"abstract": "The advection of passive tracers in a system of 4 identical point vortices is\nstudied when the motion of the vortices is chaotic. The phenomenon of\nvortex-pairing has been observed and statistics of the pairing time is\ncomputed. The distribution exhibits a power-law tail with exponent $\\sim 3.6$\nimplying finite average pairing time. This exponents is in agreement with its\ncomputed analytical estimate of 3.5. Tracer motion is studied for a chosen\ninitial condition of the vortex system. Accessible phase space is investigated.\nThe size of the cores around the vortices is well approximated by the minimum\ninter-vortex distance and stickiness to these cores is observed. We investigate\nthe origin of stickiness which we link to the phenomenon of vortex pairing and\njumps of tracers between cores. Motion within the core is considered and\nfluctuations are shown to scale with tracer-vortex distance $r$ as $r^{6}$. No\noutward or inward diffusion of tracers are observed. This investigation allows\nthe separation of the accessible phase space in four distinct regions, each\nwith its own specific properties: the region within the cores, the reunion of\nthe periphery of all cores, the region where vortex motion is restricted and\nfinally the far-field region. We speculate that the stickiness to the cores\ninduced by vortex-pairings influences the long-time behavior of tracers and\ntheir anomalous diffusion.",
"arxiv_id": "physics/0009097",
"authors": [
"A. Laforgia",
"X. Leoncini",
"L. Kuznetsov",
"G. M. Zaslavsky"
],
"categories": [
"physics.flu-dyn",
"cond-mat",
"nlin.CD",
"physics.gen-ph"
],
"doi": "10.1007/s100510170261",
"journal_ref": "Eur. Phys. J. B 20, 427-440 (2001)",
"title": "Passive Tracer Dynamics in 4 Point-Vortex Flow",
"url": "https://arxiv.org/abs/physics/0009097"
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