A Lattice-Boltzmann model for suspensions of self-propelling colloidal particles

TL;DR

This paper introduces a Lattice-Boltzmann simulation method for active colloidal particles, analyzing their velocity fields, orientation dynamics, and non-equilibrium steady state speed distributions.

Contribution

It develops a novel Lattice-Boltzmann model specifically for active colloids, capturing their complex motion and steady state behaviors in two dimensions.

Findings

Velocity fields vary with particle symmetry and activity.

Steady state speed distribution deviates from equilibrium.

Orientation changes influence particle dynamics.

Abstract

We present a Lattice-Boltzmann method for simulating self-propelling (active) colloidal particles in two-dimensions. Active particles with symmetric and asymmetric force distribution on its surface are considered. The velocity field generated by a single active particle, changing its orientation randomly, and the different time scales involved are characterized in detail. The steady state speed distribution in the fluid, resulting from the activity, is shown to deviate considerably from the equilibrium distribution.