Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session ZC02: Turbulence: Multiphase and Particle-Laden
12:50 PM–2:47 PM,
Tuesday, November 21, 2023
Room: Ballroom B
Chair: Federico Toschi, Eindhoven University of Technology
Abstract: ZC02.00002 : Deformations to a free surface by sub-surface zero-mean-flow turbulence
1:03 PM–1:16 PM
Presenter:
Daniel Ruth
(ETH Zurich)
Authors:
Daniel Ruth
(ETH Zurich)
Filippo Coletti
(ETH Zurich)
We characterize turbulence-induced free-surface deformations experimentally in a zero-mean-flow water tank in which turbulence is produced by arrays of randomly-actuated synthetic jets, spanning turbulence Reynolds numbers between 1000 and 8000, Froude numbers between 0.01 and 0.09, and Weber numbers between 0.2 and 8, with all parameters based on integral-scale quantities in the bulk. Simultaneous particle image velocimetry (PIV) and planar laser-induced fluorescence are used to relate the local surface deformation to the sub-surface vertical turbulent velocity and its vertical gradient in a vertical plane reaching multiple integral scales beneath the surface, enabling correlations between the deformation and velocity statistics over the entirety of the so-called source layer, in which the turbulence feels the surface’s presence. Secondly, PIV is performed in surface-parallel planes at various depths concurrently with a background-oriented schlieren measurement, which provides a map of the surface deformations above the recorded motions.
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