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Lagrangian acceleration statistics in a turbulent channel flow

Nickolas Stelzenmuller1, Juan Ignacio Polanco2, Laure Vignal1, Ivana Vinkovic2, and Nicolas Mordant1,*

  • 1Laboratoire des Ecoulements Géophysiques et Industriels, Université Grenoble Alpes & CNRS, Domaine Universitaire, CS 40700, F-38058 Grenoble, France
  • 2Laboratoire de Mécanique des Fluides et d'Acoustique, UMR 5509, Ecole Centrale de Lyon, CNRS, Université Claude Bernard Lyon 1, INSA Lyon, 36 av. Guy de Collongue, F-69134 Ecully, France

  • *nicolas.mordant@univ-grenoble-alpes.fr
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Phys. Rev. Fluids 2, 054602 – Published 2 May, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.054602

Abstract

Lagrangian acceleration statistics in a fully developed turbulent channel flow at Reτ=1440 are investigated, based on tracer particle tracking in experiments and direct numerical simulations. The evolution with wall distance of the Lagrangian velocity and acceleration time scales is analyzed. Dependency between acceleration components in the near-wall region is described using cross-correlations and joint probability density functions. The strong streamwise coherent vortices typical of wall-bounded turbulent flows are shown to have a significant impact on the dynamics. This results in a strong anisotropy at small scales in the near-wall region that remains present in most of the channel. Such statistical properties may be used as constraints in building advanced Lagrangian stochastic models to predict the dispersion and mixing of chemical components for combustion or environmental studies.

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Phys. Rev. Fluids 2, 054602– Published 2 May, 2017
  • Received 12 July 2016

©2017 American Physical Society

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