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Reverse buoyancy in a vibrated granular bed: Computer simulations.

Vladimir Idler1, Iván Sánchez, Ricardo Paredes

  • 1Departamento de Física, Universidad Simón Bolívar, Apartado 89000, Caracas 1080-A, Venezuela. vidler@usb.ve

The European Physical Journal. E, Soft Matter
|October 26, 2012
PubMed
Summary
This summary is machine-generated.

Researchers simulated vibrated granular beds with fluid effects, revealing reverse buoyancy. This finite-elements simulation is the first to show lighter intruders sinking, highlighting fluid forces on light granular intruders.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Granular Materials

Background:

  • Granular materials exhibit complex behaviors when vibrated.
  • Interstitial fluids can significantly alter granular dynamics.
  • Reverse buoyancy is a poorly understood phenomenon in vibrated granular systems.

Purpose of the Study:

  • To investigate the phenomenon of reverse buoyancy in vibrated granular beds.
  • To simulate the motion of intruders within a granular bed including fluid effects.
  • To provide a computational model that replicates experimental observations.

Main Methods:

  • Molecular dynamics simulations were employed.
  • Finite-elements analysis was utilized to model the system.
  • Simulations incorporated interstitial fluid effects.
  • Comparison with experimental data using fine-sized glass beads was performed.

Main Results:

  • The simulation model successfully reproduced observed behaviors in vibrated granular beds.
  • This is the first finite-elements simulation to demonstrate the sinking of lighter intruders.
  • Distinct qualitative differences in intruder motion were observed between heavy and light intruders within a vibration cycle.
  • Fluid forces had a remarkable effect on light intruders, unlike heavy ones.

Conclusions:

  • The developed simulation accurately models reverse buoyancy in vibrated granular systems.
  • Lighter intruders experience significant fluid-induced forces, leading to sinking.
  • The study provides new insights into the distinct dynamics of heavy versus light intruders in fluid-influenced granular media.