Three-dimensional fluid motion in Faraday waves: creation of vorticity and generation of two-dimensional turbulence

Abstract

We study the generation of 2D turbulence in Faraday waves by investigating the creation of spatially periodic vortices in this system. Measurements which 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. Quasi-standing 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 explain 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. 2D 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.

References in corpus (10)

• Inverse energy cascade and emergence of large coherent vortices in turbulence driven by Faraday waves
• Self-organization in turbulence as a route to order in plasma and fluids
• Capillary wave turbulence on a spherical fluid surface in low gravity
• Parametrically excited water surface ripples as ensembles of oscillons
• Spatio temporal characterization of interfacial Faraday waves: A new absorption technique
• Lattice Dynamics and Melting of a Nonequilibrium Pattern
• Taylor particle dispersion during transition to fully developed two-dimensional turbulence
• Power-law distributions of particle concentration in free-surface flows
• Measurement of entropy production rate in compressible turbulence
• Parametric generation of second sound in superfluid helium: linear stability and nonlinear dynamics

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