Granular Rayleigh-Taylor Instability: Experiments and Simulations

by: Jan L Vinningland, o I Johnsen, Eirik, Renaud Toussaint, Knut

Physical Review Letters, Vol. 99, No. 4. (2007)

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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.

@article{citeulike:2553034, 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.}, author = {Vinningland, Jan L. and Johnsen, \o I. and Eirik and Toussaint, Renaud and Knut}, citeulike-article-id = {2553034}, doi = {10.1103/PhysRevLett.99.048001}, journal = {Physical Review Letters}, keywords = {2007, cool, flow, grain, pre}, number = {4}, posted-at = {2008-03-18 21:42:53}, priority = {2}, publisher = {APS}, title = {Granular Rayleigh-Taylor Instability: Experiments and Simulations}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000099000004048001000001\&idtype=cvips\&gifs=yes}, volume = {99}, year = {2007} }

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TY - JOUR ID - citeulike:2553034 L3 - citeulike-article-id:2553034 TI - Granular Rayleigh-Taylor Instability: Experiments and Simulations JF - Physical Review Letters VL - 99 IS - 4 PB - APS N2 - 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. KW - 2007 KW - cool KW - flow KW - grain KW - pre AU - Vinningland, Jan AU - Johnsen, \o AU - Eirik AU - Toussaint, Renaud AU - Knut PY - 2007/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000099000004048001000001&idtype=cvips&gifs=yes ER -

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