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Updated: Jun 28, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow
Published on: May 1, 2018
Characterization of nondiffusive transport in plasma turbulence via a novel Lagrangian method
J A Mier1, R Sánchez, L García
1Departamento de Física, Universidad Carlos III de Madrid, Leganés, Madrid, Spain. jmier@fis.uc3m.es
Abstract:
A novel method to probe and characterize the nature of the transport of passive scalars carried out by a turbulent flow is introduced. It requires the determination of two exponents which encapsulate the statistical and correlation properties of the component of interest of the Lagrangian velocities of the flow. Numerical simulations of a magnetically confined, near-critical turbulent plasma, known to exhibit superdiffusive radial transport, are used to illustrate the method. It is shown that the method can easily detect the change in the dynamics of the radial transport that takes place after adding to the simulations a (subdominant) diffusive channel of tunable strength.
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