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Paths to caustic formation in turbulent aerosols
Gothenburg Univ, Dept Phys, SE-41296 Gothenburg, Sweden..
Tata Inst Fundamental Res, TIFR Ctr Interdisciplinary Sci, Hyderabad 500046, India..
NORDITA SU.
Gothenburg Univ, Dept Phys, SE-41296 Gothenburg, Sweden..
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2021 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 6, no 6, article id L062302Article in journal (Refereed) Published
Abstract [en]

The dynamics of small, yet heavy, identical particles in turbulence exhibits singularities, called caustics, that lead to large fluctuations in the spatial particle-number density, and in collision velocities. For large particle inertia, the fluid velocity at the particle position is essentially a white-noise signal and caustic formation is analogous to Kramers escape. Here we show that caustic formation at small particle inertia is different. Caustics tend to form in the vicinity of particle trajectories that experience a specific history of fluid-velocity gradients, characterized by low vorticity and a violent strain exceeding a large threshold. We develop a theory that explains our findings in terms of an optimal path to caustic formation that is approached in the small inertia limit.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2021. Vol. 6, no 6, article id L062302
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-298678DOI: 10.1103/PhysRevFluids.6.L062302ISI: 000661925100003Scopus ID: 2-s2.0-85108155233OAI: oai:DiVA.org:kth-298678DiVA, id: diva2:1581247
Note

Nordita SU, QC 20220920

Available from: 2021-07-20 Created: 2021-07-20 Last updated: 2022-09-20Bibliographically approved

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