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Multiphase dynamics near a single vortex, and its relevance to turbulence

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TURW03 - Modelling and analysis of turbulent transport, mixing and scaling

A basic difference between single-fluid and two-fluid turbulence will be discussed. In the flow of two immiscible fluids, surface tension acts to create vorticity on a general interface. The interface then is subject to Kelvin-Helmholtz instability. This dynamics can be calculated analytically near a single vortex, beginning with a flat interface. Three kinds of instability are seen: a core Kelvin-Helmholtz (KH) instability due to surface tension, and also a spiral KH instability and a centrifugal Rayleigh Taylor instability due to the density difference between the fluids. In 2D turbulence, these mechanisms are shown to significantly increase the energy at small scales.

This talk is part of the Isaac Newton Institute Seminar Series series.

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