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Rolling away from the Wall into Granular Matter.

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Investigating cylinder penetration into granular media reveals distinct horizontal repulsion and rotation. These movements are driven by force chains and frictional forces, with similarities to twin intruder dynamics.

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Area of Science:

  • Physics
  • Granular Mechanics
  • Soft Matter Physics

Background:

  • Sedimentation of objects into granular materials is well-studied.
  • However, the dynamics near boundaries remain largely unexplored.

Purpose of the Study:

  • To detail the penetration dynamics of a cylinder into a quasi-2D granular medium near a boundary.
  • To characterize the motion, including horizontal displacement and rotation.
  • To understand the underlying physical mechanisms driving these motions.

Main Methods:

  • Experimental setup involving a quasi-2D granular medium.
  • Tracking the trajectory of a penetrating cylindrical object.
  • Analysis of the cylinder's center of mass movement and rotation.
  • Investigation of force chain loading and frictional forces.

Main Results:

  • Observed two distinct motions: horizontal repulsion from the wall and rotation around the cylinder's axis.
  • Repulsion is attributed to force chains between the intruder and the wall.
  • Rotation is linked to frictional forces between the granular medium and the intruder.

Conclusions:

  • The study elucidates the complex dynamics of intruder penetration in granular media near boundaries.
  • Force chains and friction are key factors governing intruder behavior.
  • Analogies exist between single intruder dynamics near a wall and twin intruder sedimentation in bulk.