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Hydrodynamic interaction between two trapped swimming model micro-organisms.

R Matas Navarro1, I Pagonabarraga

  • 1Departament de Física Fonamental, Universitat de Barcelona, 08028, Barcelona, Spain. ricardmn@ffn.ub.es

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Summary
This summary is machine-generated.

We studied two active particles in harmonic traps. Their self-propelling velocity and induced stresses determine stable configurations, revealing a link between particle motion and emergent behaviors.

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Area of Science:

  • Soft matter physics
  • Theoretical physics
  • Hydrodynamics

Background:

  • Active particles, such as squirmers, exhibit complex behaviors driven by self-propulsion and induced hydrodynamic flows.
  • Understanding the collective dynamics of active particles is crucial for fields ranging from micro-robotics to biological systems.

Purpose of the Study:

  • To theoretically investigate the steady configurations and stability of two interacting active particles confined in harmonic traps.
  • To classify these configurations based on particle properties like self-propelling velocity and active stresses.
  • To explore the influence of hydrodynamic interactions on the emergent collective behavior.

Main Methods:

  • Theoretical modeling of two active particles (squirmers) under harmonic potentials.
  • Analysis of steady-state configurations and their stability.
  • Classification based on self-propelling velocity and active stress parameters.
  • Investigation of hydrodynamic flow effects and characteristic frequencies.

Main Results:

  • Identified stable configurations including collinear parallel squirmers and perpendicularly swimming particles.
  • Demonstrated that the ratio of self-propelling velocity to active stress-induced flow dictates configuration stability.
  • Found that trap potentials affect time scales but not stability.
  • Observed characteristic frequencies and showed that rapid hydrodynamic flows can destabilize configurations.

Conclusions:

  • The stable configurations of active particles are intrinsically linked to their self-propulsion mechanisms.
  • Hydrodynamic interactions play a critical role in determining the collective dynamics and stability of active particle systems.
  • This study provides insights into the fundamental principles governing the behavior of active matter.