Research School of Physics and Engineering, The Australian National University, Canberra ACT 0200, Australia.
Phys Rev Lett. 2013 May 10;110(19):194501. doi: 10.1103/PhysRevLett.110.194501. Epub 2013 May 6.
We report the generation of large coherent vortices via inverse energy cascade in Faraday wave driven turbulence. The motion of floaters in the Faraday waves is three dimensional, but its horizontal velocity fluctuations show unexpected similarity with two-dimensional turbulence. The inverse cascade is detected by measuring frequency spectra of the Lagrangian velocity, and it is confirmed by computing the third moment of the horizontal velocity fluctuations. This is observed in deep water in a broad range of wavelengths and vertical accelerations. The results broaden the scope of recent findings on Faraday waves in thin layers [A. von Kameke et al., Phys. Rev. Lett. 107, 074502 (2011)].
我们通过在法拉第波驱动的湍流中进行反向能量级联，生成了大尺度相干涡旋。浮子在法拉第波中的运动是三维的，但它的水平速度波动与二维湍流出人意料地相似。通过测量拉格朗日速度的频率谱来检测反向级联，并通过计算水平速度波动的三阶矩来确认。这在深水中的广泛波长和垂直加速度范围内都得到了观察。这些结果扩展了最近在薄层中对法拉第波的发现的范围[A. von Kameke 等人，物理评论快报 107, 074502 (2011)]。
