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Large-scale vertical vorticity generated by two crossing surface waves
Phys. Rev. Fluids 5, 094702 – Published 30 September, 2020
DOI: https://doi.org/10.1103/PhysRevFluids.5.094702
Abstract
We demonstrate that two surface waves propagating at a small angle to each other generate large-scale (compared to the wavelength) vertical vorticity owing to hydrodynamic nonlinearity in a viscous fluid. The horizontal geometric structure of the induced flow coincides with the structure of the Stokes drift in an ideal fluid, but its steady-state amplitude is larger and it penetrates deeper into the fluid volume as compared to the Stokes drift. In an unbounded fluid, the steady-state amplitude and penetration depth are increased by the factor of and the evolution time of the induced flow can be estimated as , where is the fluid kinematic viscosity and is the wave number. Also, we study how the finite depth of the fluid and a thin insoluble liquid film that possibly covers the fluid surface due to contamination effect the generation of large-scale vorticity and discuss the physical consequences of this phenomenon in the context of recent experiments.
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