Two-dimensional numerical simulation of chimney fluidization in a granular medium using a combination of discrete element and lattice Boltzmann methods

Jeff Ngoma, Pierre Philippe, Stéphane Bonelli, Farhang Radjaï, and Jean-Yves Delenne
Phys. Rev. E 97, 052902 – Published 10 May 2018

Abstract

We present here a numerical study dedicated to the fluidization of a submerged granular medium induced by a localized fluid injection. To this end, a two-dimensional (2D) model is used, coupling the lattice Boltzmann method (LBM) with the discrete element method (DEM) for a relevant description of fluid-grains interaction. An extensive investigation has been carried out to analyze the respective influences of the different parameters of our configuration, both geometrical (bed height, grain diameter, injection width) and physical (fluid viscosity, buoyancy). Compared to previous experimental works, the same qualitative features are recovered as regards the general phenomenology including transitory phase, stationary states, and hysteretic behavior. We also present quantitative findings about transient fluidization, for which several dimensionless quantities and scaling laws are proposed, and about the influence of the injection width, from localized to homogeneous fluidization. Finally, the impact of the present 2D geometry is discussed, by comparison to the real three-dimensional (3D) experiments, as well as the crucial role of the prevailing hydrodynamic regime within the expanding cavity, quantified through a cavity Reynolds number, that can presumably explain some substantial differences observed regarding upward expansion process of the fluidized zone when the fluid viscosity is changed.

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  • Received 13 February 2018

DOI:https://doi.org/10.1103/PhysRevE.97.052902

©2018 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

Jeff Ngoma1, Pierre Philippe1, Stéphane Bonelli1, Farhang Radjaï2,3, and Jean-Yves Delenne4

  • 1IRSTEA, UR RECOVER, 3275 route de Cézanne, CS 40061, Aix-en-Provence, F-13182, France
  • 2LMGC, CNRS University of Montpellier, 163 rue Auguste Broussonnet, Montpellier, F-34090, France
  • 3Multiscale Material Science for Energy and Environment, CNRS/MIT/AMU Joint Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
  • 4IATE, INRA, CIRAD, Montpellier SupAgro, Université de Montpellier, 2 place Pierre Viala, Montpellier, F-34060, France

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Issue

Vol. 97, Iss. 5 — May 2018

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