Ripples appearing on the surface of a vertically vibrated
liquid are known as Faraday waves. They are widely used
to study a broad range of phenomena, such as pattern
formation [1–4], solitons [5–10], walkers, or bouncing
orbiting droplets [11], extreme wave events [12], and
others. It has recently been found [13] that the horizontal
motion of floating particles on the surface of Faraday
waves for thin layers of liquids shows several properties
consistent with the fluid motion in two-dimensional (2D)
turbulence. This turbulent horizontal transport was referred
to as Faraday flow. In particular, a Kolmogorov k5=3
spectrum has been reported as well as the Richardson
law of pair dispersion [14]. Even though the layer was
argued to be thin (i.e., smaller than the Faraday wavelength),
the Faraday flows explored in these experiments
are indisputably three dimensional (3D) and locally divergent
flows. Some of the 2D turbulence theory assumptions
are thus clearly violated, and one should have few expectations
for the emergence of the inverse energy cascade in
this context.
Ripples appearing on the surface of a vertically vibratedliquid are known as Faraday waves. They are widely usedto study a broad range of phenomena, such as patternformation [1–4], solitons [5–10], walkers, or bouncingorbiting droplets [11], extreme wave events [12], andothers. It has recently been found [13] that the horizontalmotion of floating particles on the surface of Faradaywaves for thin layers of liquids shows several propertiesconsistent with the fluid motion in two-dimensional (2D)turbulence. This turbulent horizontal transport was referredto as Faraday flow. In particular, a Kolmogorov k5=3spectrum has been reported as well as the Richardsonlaw of pair dispersion [14]. Even though the layer wasargued to be thin (i.e., smaller than the Faraday wavelength),the Faraday flows explored in these experimentsare indisputably three dimensional (3D) and locally divergentflows. Some of the 2D turbulence theory assumptionsare thus clearly violated, and one should have few expectationsfor the emergence of the inverse energy cascade inthis context.
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