Journal
SOFT MATTER
Volume 8, Issue 1, Pages 129-139Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1sm06077e
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Funding
- NSF [DMR-0806511, DMR-1004789]
- Harvard-NSF MRSEC
- Harvard-Kavli Nano-Bio Science and Technology Center
- Wyss Institute
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We study the spatio-temporal dynamics of a model of polar active fluid in two dimensions. The system exhibits a transition from an isotropic to a polarized state as a function of density. The uniform polarized state is, however, unstable above a critical value of activity. Upon increasing activity, the active fluids displays increasingly complex patterns, including traveling bands, traveling vortices and chaotic behavior. The advection arising from the particles self-propulsion and unique to polar fluids yields qualitatively new behavior as compared to that obtained in active nematic, with traveling-wave structures. We show that the nonlinear hydrodynamic equations can be mapped onto a simplified diffusion-reaction-convection model, highlighting the connection between the complex dynamics of active system and that of excitable systems.
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