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SUMMARY:Collective dynamics in confined bacterial suspensions - Adrien Lef
 auve\, DAMTP
DTSTART:20141114T130000Z
DTEND:20141114T140000Z
UID:TALK55524@talks.cam.ac.uk
CONTACT:Aleksandra Przydrozna
DESCRIPTION:The spontaneous emergence of collective motion and large-scale
  coherent patterns is a distinct feature of soft active matter. Such syste
 ms\, in which an immersed microstructure induces active stresses in the me
 dium\, range from bacterial swarms to reactive colloidal suspensions to sh
 aken granular materials. Understanding how the local interactions between 
 individual agents translate into collective dynamics is of great fundament
 al and applied interest.\n\nSwimming particles in strongly confined liquid
 s\, such as bacterial colonies in a thin film\, are subject to unique hydr
 odynamic interactions and represent a good candidate to study such dissipa
 tive non-equilibrium systems. This seminar will present results of numeric
 al simulations based on a minimal model for swimmer dynamics and hydrodyna
 mic interactions in a Hele-Shaw geometry. We show that two-dimensional dil
 ute suspensions of fore-aft asymmetric swimmers can exhibit a rich variety
  of novel collective behaviours. We substantiate some of these phenomena u
 sing a linear stability analysis and a nonlinear traffic flow model.
LOCATION:LR3B\, Inglis Building\, CUED.
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