Anomalous diffusion of self-align active particle in flow background

TL;DR

This study investigates the complex transport behaviors of self-aligning active particles in flow, revealing how their anomalous diffusion varies with environmental conditions and suggesting universality in their dynamics.

Contribution

It introduces a detailed analysis of self-aligning active particles in flow, highlighting the impact of temperature and flow speed on diffusion and relaxation properties.

Findings

Anomalous diffusion coefficients vary sharply with temperature and flow speed.

Multiple regimes of anomalous and normal diffusion observed.

Self-aligning property may be universal in active particle dynamics.

Abstract

Active particles (i.e., self-propelled particles or called microswimmers), different from passive Brownian particles, possess more complicated translational and angular dynamics, which can generate a series of anomalous transport phenomena. In this letter, we study the two-dimensional dynamics of a self-propelled pointlike particle with self-aligning property moving in Poiseuille flow. The results show the effective anomalous diffusion coefficient changes sharply with the change of temperature and speed of background Poiseuille flow. The relaxation property of moving speed and the position probability distribution function of particles is also obtained. The observation of several types of anomalous diffusion and normal diffusion regime indicates the self-aligning property may be universal and can be used as a reference for future experiments analysis and modeling.