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SUMMARY:Turbulence\, aggregation\, and surface waves in active fluids - Ri
 card Alert\, Max Planck Institute for the Physics of Complex Systems
DTSTART:20251104T130000Z
DTEND:20251104T140000Z
UID:TALK238960@talks.cam.ac.uk
CONTACT:Tal Agranov
DESCRIPTION:A key feature of active fluids is their ability to self-organi
 ze into spontaneous flow patterns. In this talk\, I will first discuss the
  transition from laminar to chaotic flows in active fluids\, known as acti
 ve turbulence. I will show that\, unlike in the classic scenario of direct
 ed percolation in pipe flow\, the transition to turbulence in boundaryless
  active nematics is discontinuous\, and that this is due to the long-range
  hydrodynamic interactions of Stokes flow. Second\, I will discuss the agg
 regation and self-organization of bacteria via capillary forces. These for
 ces are produced by water menisci that surround bacteria in hydrated envir
 onments like soil\, textiles and agar hydrogels in the lab. Finally\, I wi
 ll discuss the emergence of active surface waves on multilayered bacterial
  colonies.
LOCATION:Center for Mathematical Sciences\, Lecture room MR4.
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