Globally aligned states and hydrodynamic traffic jams in confined active suspensions
arXiv:1307.6584 · doi:10.1103/PhysRevE.89.021002
Abstract
Strongly confined active liquids are subject to unique hydrodynamic interactions due to momentum screening and lubricated friction by the confining walls. Using numerical simulations, we demonstrate that 2D dilute suspensions of fore-aft asymmetric polar swimmers in a Hele-Shaw geometry can exhibit a rich variety of novel phase behaviors depending on particle shape, including: coherent polarized density waves with global alignment, stationary asters, persistent counter-rotating vortices, density shocks and rarefaction waves. We also explain these phenomena using a linear stability analysis and a nonlinear traffic flow model, both derived from a mean-field kinetic theory.
5 pages, 5 figures
References in corpus (8)
- Spontaneous motion in hierarchically assembled active matter
- Emergence of macroscopic directed motion in populations of motile colloids
- Fluid dynamics and noise in bacterial cell-cell and cell-surface scattering
- Confinement Stabilizes a Bacterial Suspension into a Spiral Vortex
- Swarming and swirling in self-propelled polar granular rods
- Spontaneous Circulation of Confined Active Suspensions
- Excitable Patterns in Active Nematics
- Cytoplasmic Streaming in Plant Cells Emerges Naturally by Microfilament Self-Organization
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