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Magnus effect in granular media.

Sonu Kumar1, Manish Dhiman1, K Anki Reddy1

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Summary
This summary is machine-generated.

A spinning intruder in a 2D granular medium experiences a reversed Magnus effect lift compared to fluids. This phenomenon is linked to force chain shearing and contact distribution, observed across various densities.

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Area of Science:

  • Physics
  • Granular Mechanics
  • Fluid Dynamics

Background:

  • The Magnus effect describes lift on spinning objects in viscous fluids due to pressure differences.
  • Granular media exhibit complex behaviors distinct from continuous fluids, especially under dynamic conditions.
  • Understanding particle interactions and force chains is crucial for predicting granular material flow.

Purpose of the Study:

  • To investigate the Magnus effect on a rotating circular intruder in a 2D granular medium.
  • To analyze the influence of translational and rotational motion on lift and drag forces.
  • To explore the relationship between granular properties (area fraction, jamming) and the observed lift.

Main Methods:

  • Numerical simulations were employed to model the behavior of a circular intruder.
  • The study analyzed systems with varying area fractions (0.35 to 0.82), approaching the jamming point.
  • Contact force distributions, local flow fields (velocity, area fraction, granular temperature), and wake deflection were examined.

Main Results:

  • A reversed Magnus lift was observed in the granular medium, opposite to that in viscous fluids.
  • This effect correlates with tangential force switching, uneven force chain shearing, and contact number distribution.
  • Lift-to-drag ratio saturates at high rotation speeds and shows weak dependence on area fraction.

Conclusions:

  • The Magnus effect in granular media is fundamentally different from that in viscous fluids.
  • Granular interactions, including force chains and contact mechanics, dictate the reversed lift phenomenon.
  • The findings offer insights into the dynamics of rotating objects in dense particulate flows.