Bulletin of the American Physical Society
APS March Meeting 2012
Volume 57, Number 1
Monday–Friday, February 27–March 2 2012; Boston, Massachusetts
Session H20: Invited Session: Hydrodynamics and Microstructure: From Single Self-Propelled Particles to Active Soft Matter
8:00 AM–11:00 AM,
Tuesday, February 28, 2012
Sponsoring Units: GSNP DFD
Chair: Thomas Powers, Brown University
Abstract ID: BAPS.2012.MAR.H20.3
Abstract: H20.00003 : Polar patterns in active fluids*
9:12 AM–9:48 AM
Preview Abstract Abstract
M. Cristina Marchetti
(Physics Department \& Syracuse Biomaterials Institute, Syracuse University)
Active fluids are a new class of soft materials composed of interacting units that consume energy and collectively generate motion and mechanical stress. Examples include bacterial suspensions, mixtures of cytoskeletal filaments and motor proteins, and migrating epithelial cell layers. Due to their elongated shape, active particles can exhibit orientational order at high concentration and have been likened to ``living liquid crystals'', with either nematic or polar symmetry. In this talk I will discuss the spatio-temporal dynamics of continuum models of active fluids in two dimensions, focusing on the case of a system with polar symmetry as relevant to bacterial suspensions. Upon increasing activity, the active fluid displays increasingly complex patterns, including traveling bands, traveling vortices and chaotic behavior. The nonlinear hydrodynamic equations can be mapped onto a diffusion-reaction-convection model, highlighting the connection between the complex dynamics of active system and that of excitable systems.
*This work was carried out with Luca Giomi and supported by the NSF through grants DMR-0806511 and DMR-1004789.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.H20.3
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