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首页> 外文期刊>Physical Review X >Three-Dimensional Fluid Motion in Faraday Waves: Creation of Vorticity and Generation of Two-Dimensional Turbulence
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Three-Dimensional Fluid Motion in Faraday Waves: Creation of Vorticity and Generation of Two-Dimensional Turbulence

机译：法拉第浪潮的三维流体运动：创建涡旋和二维湍流的产生

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We study the generation of 2D turbulence in Faraday waves by investigating the creation of spatially periodic vortices in this system. Measurements that couple a diffusing light imaging technique and particle tracking algorithms allow the simultaneous observation of the three-dimensional fluid motion and of the temporal changes in the wave-field topography. Quasistanding waves are found to coexist with a spatially extended fluid transport. More specifically, the destruction of regular patterns of oscillons coincides with the emergence of a complex fluid motion whose statistics are similar to that of two-dimensional turbulence. We reveal that a lattice of oscillons generates vorticity at the oscillon scale in the horizontal flow. The interaction of these vortices explains how 2D turbulence is fueled by almost standing waves. Remarkably, the curvature of Lagrangian trajectories reveals a “footprint” of the forcing-scale vortices in fully developed turbulence. Two-dimensional Navier-Stokes turbulence should be considered a source of disorder in Faraday waves. These findings also provide a new paradigm for vorticity creation in 2D flows.
机译：我们通过调查该系统中的空间周期性涡流来研究法拉第波的2D湍流。耦合扩散光成像技术和粒子跟踪算法的测量允许同时观察三维流体运动和波场地形中的时间变化。发现Quasistanding波以空间延长的流体运输共存。更具体地，常规模式的破坏与统计数据类似于二维湍流的复杂流体运动的出现恰逢其统计。我们揭示了一个散差的晶格在水平流动中以散差尺度产生涡流。这些涡流的相互作用解释了几乎驻波的2D湍流如何。值得注意的是，拉格朗日轨迹的曲率揭示了迫切规模涡流的“足迹”在完全发育的湍流中。二维Navier-Stokes湍流应该被认为是法拉第波浪的疾病来源。这些调查结果还为2D流动中的涡流创建提供了一种新的范例。

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