Investigating the magnitude and temporal localization of inertial particle mixing in turbulent channel flows

Davide Perrone (Corresponding author), J.G.M. Kuerten, Luca Ridolfi, Stefania Scarsoglio

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Mixing of inertial point particles in a turbulent channel flow at Reτ=950 is investigated by means of direct numerical simulations. We consider inertial particles, at varying Stokes number, released from pairs of sources located at different positions inside the channel and analyze the rate at which particles come into close proximity to each other. To do so, we employ a Lagrangian framework, which is suitable for the analysis of trajectories and in general for the study of mixing and dispersion problems. By varying the release position of particles along the wall-normal direction we obtain a thorough description of mixing in an anisotropic turbulent flow. Moreover, we analyze the effects of particle inertia and show that these are not univocal but also depend on the position and alignment of the sources, owing in particular to the dependence of the flow timescales on the distance from the wall.

Original languageEnglish
Article number104489
Number of pages10
JournalInternational Journal of Multiphase Flow
Publication statusPublished - Aug 2023

Bibliographical note

Funding Information:
This work was sponsored by NWO Exacte en Natuurwetenschappen (Physical Sciences) for the use of supercomputer facilities, with financial support from the Netherlands Organization for Scientific Research, NWO.


  • Channel flow
  • Inertial particles
  • Mixing
  • Turbulence


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