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Related Experiment Videos

Shocks in supersonic sand.

Erin C Rericha1, Chris Bizon, Mark D Shattuck

  • 1Center for Nonlinear Dynamics, The University of Texas at Austin, Austin, TX 78712, USA.

Physical Review Letters
|January 22, 2002
PubMed
Summary
This summary is machine-generated.

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Granular flow past a wedge exhibits supersonic behavior, with observed shocks similar to those in supersonic gas. Molecular dynamics simulations quantitatively match experimental results for granular flow dynamics.

Area of Science:

  • Physics
  • Fluid Dynamics
  • Materials Science

Background:

  • Understanding granular flow dynamics is crucial in various scientific and industrial applications.
  • Characterizing the behavior of granular materials under different flow conditions presents unique challenges.
  • Supersonic phenomena in granular flows have been theorized but experimentally verified less frequently.

Purpose of the Study:

  • To experimentally measure and characterize the time-averaged velocity, density, and temperature fields in steady granular flow past a wedge.
  • To investigate the presence and nature of shock waves in supersonic granular flow.
  • To compare experimental findings with theoretical models and simulations.

Main Methods:

  • Utilized experimental techniques to measure key flow fields (velocity, density, temperature).

Related Experiment Videos

  • Employed molecular dynamics simulations based on Newton's laws to model granular flow.
  • Solved Navier-Stokes-like equations for granular flow dynamics.

    • Main Results:

    • Observed steady granular flow past a wedge to be supersonic.
    • Determined the granular pressure disturbance speed (sound speed) to be approximately 10% of the flow speed.
    • Identified shock structures in the granular flow analogous to those in supersonic gas dynamics.
    • Molecular dynamics simulations achieved quantitative agreement with experimental data.
    • Navier-Stokes-like simulations matched molecular dynamics results when wall friction was excluded.

    Conclusions:

    • Granular flows can exhibit supersonic behavior and shock phenomena similar to gases.
    • Molecular dynamics simulations provide a reliable method for modeling granular flow dynamics.
    • Navier-Stokes-like equations offer a viable approach for simulating granular flows under specific conditions, highlighting the impact of factors like wall friction.