Turbulence unsteadiness drives extreme clustering

We show that the unsteadiness of turbulence has a drastic effect on turbulence parameters and in particle cluster formation. To this end we use direct numerical simulations of particle laden flows with a steady forcing that generates an unsteady large-scale flow. Particle clustering correlates with...

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Bibliographic Details
Published inarXiv.org
Main Authors Zapata, Florencia, Angriman, Sofía, Ferran, Amélie, Cobelli, Pablo J, Obligado, Martin, Mininni, Pablo D
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 22.02.2024
Subjects
Clustering
Correlation
Direct numerical simulation
Energy dissipation
Extreme values
Fluid dynamics
Fluid flow
Reynolds number
Turbulence effects
Turbulent flow
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Summary:We show that the unsteadiness of turbulence has a drastic effect on turbulence parameters and in particle cluster formation. To this end we use direct numerical simulations of particle laden flows with a steady forcing that generates an unsteady large-scale flow. Particle clustering correlates with the instantaneous Taylor-based flow Reynolds number, and anti-correlates with its instantaneous turbulent energy dissipation constant. A dimensional argument for these correlations is presented. In natural flows, unsteadiness can result in extreme particle clustering, which is stronger than the clustering expected from averaged inertial turbulence effects.
ISSN:2331-8422