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首页> 外文期刊>Journal of Physics Communications >Passive particles Levy walk through turbulence mirroring the diving patterns of marine predators
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Passive particles Levy walk through turbulence mirroring the diving patterns of marine predators

机译：被动粒子征费穿过湍流，反映了海洋捕食者的潜水模式

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Lagrangian stochastic models for the simulation particle trajectories in turbulent flows can be made to be consistent with Kolmogorov's similarity theory and with prescribed Eulerian velocity statistics. Intermittency (i.e., large temporal fluctuations in the rate of dissipation of turbulent kinetic energy) can also be accounted for but is usually neglected because its impact on turbulent dispersion is typically negligible. Here I show both heuristically and with the aid of numerical simulations that intermittency results in Levy (Cauchy) walk movement patterns. The novel predictions finds strong support in an analysis of movement pattern data for inert (dead) copepods in turbulent flows. This is the first experimental account of single particle movements in turbulence having Levy walk characteristics. The mechanism stands apart from the much-studied chaotic and multiplicative pathways to Levy walking. Levy walk have been observed in sharks, bony fishes and in other aquatic marine predators and these have been attributed to the execution of an evolved, advantageous searching strategy. The new finding suggests that going with the flow is sufficient to explain the occurrence of these Levy walks.
机译：可以使湍流中模拟颗粒轨迹的拉格朗日随机模型与Kolmogorov的相似理论和规定的欧拉速度统计一致。也可以考虑间歇性（即湍动能耗散速率的较大时间波动），但通常可以忽略，因为它对湍流扩散的影响通常可以忽略不计。在这里，我通过启发式方法和数值模拟方法显示了间歇性导致Levy（高加索人）步行运动模式。新颖的预测为湍流中惰性（死）co足类的运动模式数据分析提供了有力的支持。这是具有Levy行走特性的湍流中单个粒子运动的第一个实验说明。该机制与被广泛研究的向Levy行走的混沌和乘法路径不同。在鲨鱼，硬骨鱼类和其他水生捕食动物中都观察到了倾斜走动，这归因于执行了一种进化的，有利的搜索策略。新发现表明，顺势而为足以解释这些征税活动的发生。

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