Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, Epiciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Abstract : A granular instability driven by gravity is studied experimentally and numerically. The instability arises as grains fall in a closed Hele-Shaw cell where a layer of dense granular material is positioned above a layer of air. The initially flat front defined by the grains subsequently develops into a pattern of falling granular fingers separated by rising bubbles of air. A transient coarsening of the front is observed right from the start by a finger merging process. The coarsening is later stabilized by new fingers growing from the center of the rising bubbles. The structures are quantified by means of Fourier analysis and quantitative agreement between experiment and computation is shown. This analysis also reveals scale invariance of the flow structures under overall change of spatial scale.
https://hal-insu.archives-ouvertes.fr/insu-02378051 Contributor : Renaud ToussaintConnect in order to contact the contributor Submitted on : Sunday, November 24, 2019 - 8:28:48 PM Last modification on : Tuesday, October 19, 2021 - 7:00:27 PM Long-term archiving on: : Tuesday, February 25, 2020 - 1:07:42 PM