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Vortices within vortices: hierarchical nature of vortex tubes in turbulence
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The JHU turbulence database [1] can be used with a state of the art visualisation tool [2] to generate high quality fluid dynamics videos. In this work we investigate the classical idea that smaller structures in turbulent flows, while engaged in their own internal dynamics, are advected by the larger structures. They are not advected undistorted, however. We see instead that the small scale structures are sheared and twisted by the larger scales. This illuminates the basic mechanisms of the turbulent cascade.
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Cited by 1 Pith paper
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Circulation Fluctuations of Elementary Turbulent Vortices
Individual vortex circulations in turbulence are fat-tailed because fast modes of the lognormal dissipation field multiply a Gaussian circulation, producing a closed PDF that fits DNS data.
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