Bulletin of the American Physical Society
APS March Meeting 2014
Volume 59, Number 1
Monday–Friday, March 3–7, 2014; Denver, Colorado
Session J14: Invited Session: Collective Motion Across Scales: From Proteins to Animals
2:30 PM–5:30 PM,
Tuesday, March 4, 2014
Sponsoring Unit: DBIO
Chair: Ajay Gopinathan, University of Califonria, Merced
Abstract ID: BAPS.2014.MAR.J14.3
Abstract: J14.00003 : Dynamics and Emergent Structures in Active Fluids*
3:42 PM–4:18 PM
In this talk, we consider an active fluid of colloidal sized particles, with the primary manifestation of activity being a self-replenishing velocity along one body axis of the particle. This is a minimal model for varied systems such as bacterial colonies, cytoskeletal filament motility assays vibrated granular particles and self propelled diffusophoretic colloids, depending on the nature of interaction among the particles. Using microscopic Brownian dynamics simulations, coarse-graining using the tools of non-equilibrium statistical mechanics and analysis of macroscopic hydrodynamic theories, we characterize emergent structures seen in these systems, which are determined by the symmetry of the interactions among the active units, such as propagating density waves, dense stationary bands, asters and phase separated isotropic clusters. We identify a universal mechanism, termed ``self-regulation,'' as the underlying physics that leads to these structures in diverse systems.
*Support from NSF through DMR-1149266 and DMR-0820492.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2014.MAR.J14.3
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