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• W2008476194 abstract "Systems of self-propelled particles are known for their tendency to aggregate and to display swarm behavior. We investigate two model systems: self-propelled rods interacting via volume exclusion and sinusoidally beating flagella embedded in a fluid with hydrodynamic interactions. In the flagella system, beating frequencies are gaussian distributed with a nonzero average. These systems are studied by brownian-dynamics simulations and by mesoscale hydrodynamics simulations, respectively. The clustering behavior is analyzed as the particle density and the environmental or internal noise are varied. By distinguishing three types of cluster-size probability density functions, we obtain a phase diagram of different swarm behaviors. The properties of clusters such as their configuration, lifetime, and average size are analyzed. We find that the swarm behavior of the two systems, characterized by several effective power laws, is very similar. However, a more careful analysis reveals several differences. Clusters of self-propelled rods form due to partially blocked forward motion and are therefore typically wedge shaped. At higher rod density and low noise, a giant mobile cluster appears, in which most rods are mostly oriented toward the center. In contrast, flagella become hydrodynamically synchronized and attract each other; their clusters are therefore more elongated. Furthermore, the lifetime of flagella clusters decays more quickly with cluster size than of rod clusters." @default.
• W2008476194 created "2016-06-24" @default.
• W2008476194 creator A5058136539 @default.
• W2008476194 creator A5066096589 @default.
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• W2008476194 date "2010-09-15" @default.
• W2008476194 modified "2023-10-12" @default.
• W2008476194 title "Swarm behavior of self-propelled rods and swimming flagella" @default.
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• W2008476194 doi "https://doi.org/10.1103/physreve.82.031904" @default.
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