Dynamic regimes of hydrodynamically coupled self-propelling particlesI. Llopis and I. Pagonabarraga
Departament de Física Fonamental, Universitat de Barcelona C. Martí i Franqués 1, 08028 Barcelona, Spain
received 9 February 2006; accepted in final form 24 July 2006
published online 23 August 2006
We analyze the collective dynamics of self-propelling particles (spps) which move at small Reynolds numbers including the hydrodynamic coupling to the suspending solvent through numerical simulations. The velocity distribution functions show marked deviations from Gaussian behavior at short times, and the mean-square displacement at long times shows a transition from diffusive to ballistic motion for appropriate driving mechanism at low concentrations. We discuss the structures the spps form at long times and how they correlate to their dynamic behavior.
87.18.Hf - Spatiotemporal pattern formation in cellular populations.
05.10.-a - Computational methods in statistical physics and nonlinear dynamics.
82.70.Dd - Colloids.
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