Direct Simulation of Multiphase Flows with Density Variations
Abstract
Interfacial instability plays an important rôle in the primary atomization of high-speed liquid jets. We present simulations of the Kelvin-Helmholtz instability of a sheared liquid-gas interface. The two-dimensional simulations of the Navier-Stokes equation with surface tension show the formation of liquid sheets at sufficiently high Weber and Reynolds numbers. The three-dimensional simulations show two scenarios, depending on the degree of three dimensionality in the initial conditions. The first scenario involves the Rayleigh instability of cylinders that are formed when the rim detaches from the sheets. The second involves a faster distortion of the rim; the precise mechanism that yields this behavior is still unknown.
Keywords
Direct Numerical Simulation Multiphase Flow Multigrid Method Direct Simulation Liquid SheetPreview
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