The waltz of tiny droplets and the flow they live in

Abstract

This article describes the dynamics of small inertial particles centrifuging out of a single vortex. It shows the importance of caustics formation in the vicinity of a single vortex: both for particle collisions and void formation. From these single-vortex studies we provide estimates of the role of caustics in high Reynolds number turbulence, and in the case of clouds, estimate how they may help in rain initiation by bridging the droplet-growth bottleneck. We briefly describe how the Basset- Boussinesq history force may be calculated by a method which does not involve huge memory costs, and provide arguments for its possible importance for droplets in turbulence. We discuss how phase change could render cloud turbulence fundamentally different from turbulence in other situations.

arXiv comment15 pages, 8 figures

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Cited by in corpus (5)

• Direct numerical simulation of particle clustering and turbulence modulation: an Eulerian approach
• Caustics in the sine-Gordon model from quenches in coupled 1D Bose gases
• Caustics of finitely dense inertial particles
• Polydisperse collision kernels in droplet-laden turbulence with implications for rain formation
• Active Caustics