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- W2076306530 abstract "When a barotropic shear layer becomes unstable, it produces the well-known Kelvin-Helmholtz instability (KHI). The nonlinear manifestation of the KHI is usually in the form of spiral billows. However, a piecewise linear shear layer produces a different type of KHI characterized by elliptical vortices of constant vorticity connected via thin braids. Using direct numerical simulation and contour dynamics, we show that the interaction between two counterpropagating vorticity waves is solely responsible for this KHI formation. We investigate the oscillation of the vorticity wave amplitude, the rotation and nutation of the elliptical vortex, and straining of the braids. Our analysis also provides a possible explanation for the formation and evolution of elliptical vortices appearing in geophysical and astrophysical flows, e.g., meddies, stratospheric polar vortices, Jovian vortices, Neptune's Great Dark Spot, and coherent vortices in the wind belts of Uranus." @default.
- W2076306530 created "2016-06-24" @default.
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- W2076306530 date "2013-01-29" @default.
- W2076306530 modified "2023-10-14" @default.
- W2076306530 title "Evolution of a barotropic shear layer into elliptical vortices" @default.
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- W2076306530 doi "https://doi.org/10.1103/physreve.87.013020" @default.
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