Article (Scientific journals)
Lattice model to derive the fluctuating hydrodynamics of active particles with inertia
Manacorda, Alessandro
2017In Physical Review Letters
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Abstract :
[en] We derive the hydrodynamic equations with fluctuating currents for the density, momentum, and energy fields for an active system in the dilute limit. In our model, nonoverdamped self-propelled particles (such as grains or birds) move on a lattice, interacting by means of aligning dissipative forces and excluded volume repulsion. Our macroscopic equations, in a specific case, reproduce a transition line from a disordered phase to a swarming phase and a linear dispersion law accounting for underdamped wave propagation. Numerical simulations up to a packing fraction ∼ 10 % are in fair agreement with the theory, including the macroscopic noise amplitudes. At a higher packing fraction, a dense-diluted coexistence emerges. We underline the analogies with the granular kinetic theories, elucidating the relation between the active swarming phase and granular shear instability.
Disciplines :
Physics
Author, co-author :
Manacorda, Alessandro  ;  Università degli Studi di Roma "La Sapienza"
External co-authors :
yes
Language :
English
Title :
Lattice model to derive the fluctuating hydrodynamics of active particles with inertia
Publication date :
15 November 2017
Journal title :
Physical Review Letters
ISSN :
1079-7114
Publisher :
American Physical Society, New York, United States - New York
Peer reviewed :
Peer Reviewed verified by ORBi
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