Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session T23: Free Surface Flows: Turbulence
4:25 PM–6:09 PM,
Monday, November 20, 2023
Room: 149AB
Chair: Filippo Coletti, ETH Zurich
Abstract: T23.00001 : Surface-attached vortex imprints as a proxy for surface divergence
4:25 PM–4:38 PM
Presenter:
Omer Babiker
(NTNU)
Authors:
Omer Babiker
(NTNU)
Ivar Bjerkebæk
(SINTEF Energy Research, 7465 Trondheim, Norway)
Anqing Xuan
(University of Minnesota)
Lian Shen
(University of Minnesota)
Simen Å Ellingsen
(Norwegian Univ Tech (NTNU))
From direct numerical simulations, we use a newly developed method whereby the surface-attached vortices are identified and tracked from their surface imprint only. We show that a correlation of around 0.9 exists between the time-dependent number of surface-attached vortices and the mean square of the surface divergence. Peaks in the number of vortices occur a little time after the peak in surface divergence, approximately half of the integral timescale of the bulk turbulence. Thus, observation of surface dimples can act as a proxy for surface divergence, with the prospect of remote sensing of mass transfer rates.
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