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Article Dans Une Revue Physical Review Letters Année : 2022

Small Obstacle in a Large Polar Flock

Résumé

We show that arbitrarily large polar flocks are susceptible to the presence of a single small obstacle. In a wide region of parameter space, the obstacle triggers counterpropagating dense bands leading to reversals of the flow. In very large systems, these bands interact, yielding a never-ending chaotic dynamics that constitutes a new disordered phase of the system. While most of these results were obtained using simulations of aligning self-propelled particles, we find similar phenomena at the continuous level, not when considering the basic Toner-Tu hydrodynamic theory, but in simulations of truncations of the relevant Boltzmann equation.

Dates et versions

cea-04345013 , version 1 (14-12-2023)

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Citer

Joan Codina, Benoît Mahault, Hugues Chaté, Jure Dobnikar, Ignacio Pagonabarraga, et al.. Small Obstacle in a Large Polar Flock. Physical Review Letters, 2022, 128 (21), pp.218001. ⟨10.1103/PhysRevLett.128.218001⟩. ⟨cea-04345013⟩
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