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Related Experiment Video

Updated: Jul 13, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability
06:42

Magnetically Induced Rotating Rayleigh-Taylor Instability

Published on: March 3, 2017

Granular Rayleigh-Taylor instability: experiments and simulations.

Jan Ludvig Vinningland1, Øistein Johnsen, Eirik G Flekkøy

  • 1Department of Physics, University of Oslo, P.O. Box 1048, N-0316 Oslo, Norway. janlv@fys.uio.no

Physical Review Letters
|August 7, 2007
PubMed
Summary
This summary is machine-generated.

Gravity-driven granular instability forms falling fingers and rising air bubbles in a Hele-Shaw cell. This study quantifies the evolving structures and reveals scale invariance in granular flow dynamics.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Materials Science

Background:

  • Granular materials exhibit complex behaviors when subjected to external forces.
  • Instabilities in multiphase flows, such as granular materials and fluids, are crucial for understanding geological and industrial processes.

Purpose of the Study:

  • To experimentally and numerically investigate a gravity-driven granular instability.
  • To analyze the pattern formation, dynamics, and scaling properties of granular fingers and air bubbles.

Main Methods:

  • Utilized a closed Hele-Shaw cell with dense granular material over air.
  • Performed experimental observations and numerical simulations of the granular flow.
  • Employed Fourier analysis for quantitative structure analysis.

Main Results:

  • Observed the development of falling granular fingers and rising air bubbles from an initially flat front.
  • Documented transient coarsening via finger merging, followed by stabilization through new finger growth.
  • Achieved quantitative agreement between experimental and computational results.

Conclusions:

  • The study elucidates the mechanisms of pattern formation in gravity-driven granular flows.
  • Demonstrated scale invariance in the observed flow structures, indicating universal scaling properties.
  • Validated the combined experimental and numerical approach for studying granular instabilities.