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Annual Review of Fluid Mechanics

Volume 56, 2024

Statistical Models for the Dynamics of Heavy Particles in Turbulence

Abstract

When very small particles are suspended in a fluid in motion, they tend to follow the flow. How such tracer particles are mixed, transported, and dispersed by turbulent flow has been successfully described by statistical models. Heavy particles, with mass densities larger than that of the carrying fluid, can detach from the flow. This results in preferential sampling, small-scale fractal clustering, and large relative velocities. To describe these effects of particle inertia, one must consider both particle positions and velocities in phase space. In recent years, statistical phase-space models have significantly contributed to our understanding of inertial-particle dynamics in turbulence. These models help to identify the key mechanisms and nondimensional parameters governing the particle dynamics and have made qualitative and, in some cases, quantitative predictions. This article reviews statistical phase-space models for the dynamics of small, yet heavy, spherical particles in turbulence. We evaluate their effectiveness by comparing their predictions with results from numerical simulations and laboratory experiments, and we summarize their successes and failures.

Keyword(s): caustics, collisions, fractal phase-space attractor, interactions, multiphase flow, particle inertia, preferential sampling, relative velocities, statistical models, turbulent particle suspensions
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2024-01-19
2024-05-06
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Statistical Models for the Dynamics of Heavy Particles in Turbulence
Annual Review of Fluid Mechanics 56, 189 (2024); https://doi.org/10.1146/annurev-fluid-032822-014140
/content/journals/10.1146/annurev-fluid-032822-014140
/content/journals/10.1146/annurev-fluid-032822-014140
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