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SUMMARY:A touch of non-linearity: mesoscale swimmers and active matter in 
 fluids - Prof. Daphne Klotsa\, University of North Carolina at Chapel Hill
DTSTART:20220620T130000Z
DTEND:20220620T133000Z
UID:TALK175292@talks.cam.ac.uk
CONTACT:Jerelle Joseph
DESCRIPTION:Living matter\, such as biological tissue\, can be seen as a n
 onequilibrium hierarchical assembly of assemblies of smaller and smaller a
 ctive components\, where energy is consumed at many scales. The functional
 ity and versatility of such living or "active-matter" systems render it a 
 promising candidate to study and to synthetically design. While many activ
 e-matter systems reside in fluids (solution\, blood\, ocean\, air)\, so fa
 r\, studies that include hydrodynamic interactions have focussed on micros
 copic scales in Stokes flows\, where the active particles are less than 10
 0μm and the Reynolds number\, Re much less than 1. At those microscopic s
 cales viscosity dominates and inertia can be neglected. However\, what hap
 pens as swimmers slightly increase in size (say ~0.1mm-100cm) or as they f
 orm larger aggregates and swarms? The system then enters the intermediate 
 Reynolds regime where both inertia and viscosity play a role\, and where n
 onlinearities in the fluid are introduced. In this talk\, I will present m
 y group's work on simple model swimmers we use to understand the transitio
 n from Stokes to intermediate Reynolds numbers\, first for a single swimme
 r\, then for pairwise interactions and finally for collective behavior. We
  show that\, even for simple models\, inertia can induce hydrodynamic inte
 ractions that generate novel phase behavior\, steady states and transition
 s.
LOCATION:Venue to be confirmed
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