Random motion of a circle microswimmer in a random environment

Abstract

We simulate the dynamics of a single circle microswimmer exploring a disordered array of fixed obstacles. The interplay of two different types of randomness, quenched disorder and stochastic noise, is investigated to unravel their impact on the transport properties. We compute lines of isodiffusivity as a function of the rotational diffusion coefficient and the obstacle density. We find that increasing noise or disorder tends to amplify diffusion, yet for large randomness the competition leads to a strong suppression of transport. We rationalize both the suppression and amplification of transport by comparing the relevant time scales of the free motion to the mean period between collisions with obstacles.

arXiv comment21 pages, 8 figures

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• Analytical approach to chiral active systems: suppressed phase separation of interacting Brownian circle swimmers
• Active Brownian and inertial particles in disordered environments: short-time expansion of the mean-square displacement
• Microscopic theory for the diffusion of an active particle in a crowded environment
• The effects of rapid yawing on simple swimmer models and planar Jeffery's orbits
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• Active particles in reactive disordered media: how does adsorption affects diffusion?
• Chiral Active Matter