Lattice-Boltzmann hydrodynamics of anisotropic active matter

Joost de Graaf*, Henri Menke, Arnold J. T. M. Mathijssen, Marc Fabritius, Christian Holm, Tyler N. Shendruk

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A plethora of active matter models exist that describe the behavior of self-propelled particles (or swimmers), both with and without hydrodynamics. However, there are few studies that consider shape-anisotropic swimmers and include hydrodynamic interactions. Here, we introduce a simple method to simulate self-propelled colloids interacting hydrodynamically in a viscous medium using the lattice-Boltzmann technique. Our model is based on raspberry-type viscous coupling and a force/counter-force formalism, which ensures that the system is force free. We consider several anisotropic shapes and characterize their hydrodynamic multipolar flow field. We demonstrate that shape-anisotropy can lead to the presence of a strong quadrupole and octupole moments, in addition to the principle dipole moment. The ability to simulate and characterize these higher-order moments will prove crucial for understanding the behavior of model swimmers in confining geometries. (C) 2016 AIP Publishing LLC.

Original languageEnglish
Article number134106
Number of pages9
JournalThe Journal of Chemical Physics
Volume144
Issue number13
DOIs
Publication statusPublished - 7 Apr 2016

Keywords

  • LOW-REYNOLDS-NUMBER
  • SWIMMING MODEL MICROORGANISMS
  • SELF-PROPULSION
  • AUTONOMOUS MOVEMENT
  • SPERM CELLS
  • SUSPENSIONS
  • SIMULATION
  • DYNAMICS
  • PARTICLES
  • DIFFUSION

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