Polar Patterns in Active Fluids

Details Polar Patterns in Active Fluids Polar Patterns in Active Fluids

2011-06-08

arxiv.org/abs/1106.1624v2

Soft Matter 8, 129 (2012)

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 11 figures

Scientific paper

10.1039/C1SM06077E

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 obtain 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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