Macroscopic structures generated by microorganisms swimming in a fluid
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Tipus de documentText en actes de congrés
Data publicació2015-05-05
EditorBarcelona Supercomputing Center
Condicions d'accésAccés obert
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continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
It is known that active particles induce emerging patterns as
a result of their dynamic interactions, giving rise to amazing
collective motions, such as swarming or clustering. Here we present
a systematic numerical study of self-propelling particles; our main
goal is to characterize the collective behavior of suspensions of
active particles as a result of the competition among their propulsion
activity and the intensity of an attractive pair potential. Active
particles are modeled using the squirmer model. Due to its
hydrodynamic nature, we are able to classify the squirmer swimmer
activity in terms of the stress it generates (referred to as pullers or
pushers). We show that these active stresses play a central role in
the emergence of collective motion. We have found that
hydrodynamics drive the coherent swimming between swimmers
while the swimmer direct interactions, modeled by a Lennard-Jones
potential, contributes to the swimmers’ cohesion. This competition
gives rise to two different regimes where giant density fluctuations
(GDF) emerge. These two regimes are differentiated by the
suspension alignment; one regime has GDF in aligned suspensions
whereas the other regime has GDF of suspensions with an isotropic
orientated state. All the simulated squirmer suspensions shown in this
study were characterized by a thorough analysis of global properties
of the squirmer suspensions as well as a complementary cluster
analysis.
CitacióAlarcón, Francisco; Pagonabarraga, Ignacio. Macroscopic structures generated by microorganisms swimming in a fluid. A: "BSC Doctoral Symposium (2nd: 2015: Barcelona)". 2nd ed. Barcelona: Barcelona Supercomputing Center, 2015, p. 77-78.
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