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Collapses of two-dimensional granular columns.

Gert Lube1, Herbert E Huppert, R Stephen J Sparks

  • 1Research Division Dynamics of the Ocean Floor, IFM-GEOMAR, Leibniz Institute for Marine Sciences, Wischhofstrasse 1-3, D-24148 Kiel, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 31, 2005
PubMed
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Granular column collapse dynamics were quantitatively observed. Findings reveal flow regimes independent of friction, challenging existing models and highlighting initial geometry

Area of Science:

  • Physics
  • Geophysics
  • Material Science

Background:

  • Granular material collapse is a complex phenomenon with applications in geophysics and engineering.
  • Existing models often rely heavily on frictional parameters, which may not fully capture flow dynamics.

Purpose of the Study:

  • To provide the first detailed quantitative observations of two-dimensional granular column collapse.
  • To investigate the influence of initial geometry and material properties on collapse behavior.
  • To identify distinct flow regimes and their governing mechanisms.

Main Methods:

  • Quantitative observation of granular column collapse along a horizontal channel using various materials.
  • Complementary study of axisymmetric collapse scenarios.
  • Analysis of flow regimes based on the aspect ratio (initial height to width).

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Main Results:

  • Two distinct flow regimes were identified at an approximate aspect ratio of 1.8.
  • The generally accepted friction-dependent approaches do not adequately describe the main flow phenomena.
  • For high aspect ratios (a > 1.8), collapse details are determined during the spreading phase and are independent of friction.

Conclusions:

  • Granular column collapse is primarily governed by initial geometry, particularly in the high aspect ratio regime.
  • The study challenges the dominant role of friction in current models for granular collapses.
  • A sequential flow pattern of spreading followed by avalanching characterizes the collapse process.