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Paper   IPM / Physic / 16286
School of Physics
  Title:   Active particles with polar alignment in ring-shaped confinement
1.  Z. Fazli
2.  A. Naji
  Status:   Preprint
  Year:  2020
  Supported by:  IPM
We study steady-state properties of a suspension of active (self-propelled) Brownian particles with alignment interactions confined within a ring-shaped confinement in two dimensions. The interparticle alignment is such that it tends to align the orientations of self-propulsion of the particles. We report a crossover region in the parameter space, where active particles migrate from one of the circular boundaries to the other, an effect that is shown to result from the interplay of curvature effects and alignment interactions. This crossover depends on various system parameters, including area fraction of active particles, their self-propulsion and chirality strengths, and radii of the bounding circles. We analyze the swim pressure exerted on the inner and outer boundaries as a function of the interparticle alignment strength and show that, for all parameter values, the swim pressure on the inner (outer) boundary is increased (decreased) as a a result of alignment interactions and in comparison with the respective swim pressures in a noninteracting system.

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