Time Dependence and Density Inversion in Simulations of Vertically Oscillated Granular Layers

Authors

Jonathan Bougie, Loyola University Chicago
Veronica Policht, University of Texas at Tyler
Jennifer Kreft Pearce, Roger Williams UniversityFollow

Document Type

Article

Publication Date

2012

Comments

Published in: Physical Review, E 83, 2012

Abstract

We study a layer of grains atop a plate which oscillates sinusoidally in the direction of gravity, using three-dimensional, time-dependent numerical solutions of continuum equations to Navier-Stokes order as well as hard-sphere molecular dynamics simulations. For high accelerational amplitudes of the plate, the layer exhibits a steady-state “density inversion” in which a high-density portion of the layer is supported by a lower-density portion. At low accelerational amplitudes, the layer exhibits oscillatory time dependence that is strongly correlated to the motion of the plate. We show that continuum simulations yield results consistent with molecular dynamics results in both regimes.

Recommended Citation

Hammack, A., Y.L. Chen, and J. Kreft Pearce. 2011. "Role of Dissolved Salts in Thermophoresis of DNA: Lattice-Boltzmann Simulations." Physical Review E 83: 031915.