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Rayleigh–Taylor-like effects in the settling of finite-size particle fronts
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DOI：10.1017/jfm.2026.11789.png)
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Abstract
En 中文
We study the settling of a heavy particle-laden phase layered above an unladen fluid. When the suspension has finite dilution; the dynamic of this set-up has remained largely unexplored. This system; which is fundamentally analogous to that found when studying the Rayleigh–Taylor instability; generates a mixing front whose width grows at an anomalous rate. In the present work; we explore the fluid and particle dynamics underpinning the mixing layer expansion. We perform particle-resolved direct numerical simulations to investigate the set-up: we use particle-to-fluid density ratios . The results show the emergence of flow structures analogous to Rayleigh–Taylor plumes. Downward-directed structures are preferentially sampled by the particles; and within their cores; particles are able to accelerate past their terminal velocity in still fluid; resulting in strongly enhanced settling rates. We quantify the intensity of turbulence in the mixing layer; showing possible evidence of an incipient energy cascade.
Keywords:
particle/fluid flows
multiphase flow
suspensions
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