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Effect of local flow geometry on particle pair dispersion angle

B. L. Español, M. Noseda, P. J. Cobelli, and P. D. Mininni

  • Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, Ciudad Universitaria, 1428 Buenos Aires, Argentina and CONICET—Universidad de Buenos Aires, Instituto de Física Interdisciplinaria y Aplicada (INFINA), Ciudad Universitaria, 1428 Buenos Aires, Argentina

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Phys. Rev. Fluids 10, 044501 – Published 18 April, 2025

DOI: https://doi.org/10.1103/PhysRevFluids.10.044501

Abstract

We combine experiments in a von Kármán flow with numerical simulations of Taylor-Green and homogeneous and isotropic turbulence to study the effect of the local flow geometry on particle pair dispersion. To characterize particle dispersion, we use the pair dispersion angle, defined as the angle between the relative position and relative velocity of particle pairs. This angle was recently introduced as a means to more effectively identify the different dispersion regimes in finite-Reynolds-number flows. Our results show that, at a global scale, all flows considered show similar dispersion properties in terms of this metric, characterized by ballistic, superdiffusive, and diffusive regimes. Locally, however, these systems exhibit distinct behaviors, with anisotropies and local geometric features significantly influencing dispersion in both the von Kármán and Taylor-Green flows.

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Phys. Rev. Fluids 10, 044501– Published 18 April, 2025
  • Received 12 November 2024
  • Accepted 20 March 2025
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