Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session A28: Geophysical Fluid Dynamics: Oceanographic I
8:00 AM–9:57 AM,
Sunday, November 19, 2023
Room: 152A
Chair: Hussein Aluie, University of Rochester
Abstract: A28.00005 : A physics-based explanation for the existence of Stokes drift
8:52 AM–9:05 AM
Presenter:
Raphael Benamran
(Brown University)
Authors:
Raphael Benamran
(Brown University)
Aidan Blaser
(University of California, San Diego)
Luc Lenain
(University of California, San Diego)
Bia Villas Bôas
(Colorado School of Mines)
Nicholas Pizzo
(University of California, San Diego)
Despite its discovery in 1847 by George Gabriel Stokes, the current explanations for Stokes drift are ambiguous and obscure the fundamental underlying kinematic nature of this phenomenon, one that is dominated by vorticity even when the flow is irrotational.
Through calculations in the Lagrangian reference frame, the most natural frame for understanding particle trajectories, we highlight the connection between the vorticity and the wave-induced drift. From our direct analysis in the Lagrangian frame, we provide clearer definitions of quantities such as `wave phase, crest, and trough' and call into question common explanations such as `the particle spends more time at the crest of the wave vs. the trough'. The results are further validated through numerical simulations of particle trajectories from our newly developed surface wave solver.
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