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Related Experiment Video

Updated: Jul 22, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow

The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

Particle dispersion in synthetic turbulent flows

Reigada¹, Marti, Sokolov

¹Departament de Quimica Fisica, Universitat de Barcelona, Avinguda Diagonal 647, Barcelona 08028, Spain.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

|November 23, 2000

Summary

We investigated how particles spread in turbulent flow, finding that Richardson

Area of Science:

Fluid dynamics
Turbulence research
Particle transport

Background:

Particle dispersion in turbulent flows is crucial for understanding various natural and industrial processes.
Richardson's law describes two-particle dispersion, but the underlying mechanisms can vary.
The interplay between diffusive and ballistic motion influences dispersion patterns.

Purpose of the Study:

To analyze Lagrangian particle dispersion in a synthetic turbulent flow.
To investigate the factors governing two-particle and cluster dispersion.
To explore the dominance of diffusive versus ballistic mechanisms in Richardson's law.

Main Methods:

Lagrangian perspective tracking of particles.
Analysis of interparticle distance distributions.

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Calculation of relative velocity correlation functions.

Examination of relative trajectories.

Main Results:

Richardson's law for two-particle dispersion can arise from different underlying mechanisms.
The nature of dispersion (diffusive or ballistic) is dependent on flow parameters.
A persistence parameter quantifies the relative importance of diffusive and ballistic mechanisms.

Conclusions:

The study clarifies the mechanisms behind Richardson's law in turbulent particle dispersion.
Flow parameters critically determine whether dispersion is primarily diffusive or ballistic.
The findings contribute to a deeper understanding of particle transport in turbulent environments.