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SUMMARY:Fluid dynamics of bacterial turbulence - Dunkel\, J (University of
  Cambridge)
DTSTART:20130628T161500Z
DTEND:20130628T164000Z
UID:TALK45963@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Self-sustained turbulent structures have been observed in a wi
 de range of living fluids\, yet no quantitative continuum theory exists to
  explain their properties. We report experiments on active turbulence in h
 ighly concentrated 3D suspensions of Bacillus subtilis and compare them wi
 th a minimal fourth-order vector-field theory for incompressible bacterial
  dynamics. Velocimetry of bacteria and surrounding fluid\, determined by i
 maging cells and tracking colloidal tracers\, yields consistent results fo
 r velocity statistics and correlations over two orders of magnitude in kin
 etic energy\, revealing a decrease of fluid memory with increasing swimmin
 g activity and linear scaling between energy and enstrophy. The best-fit m
 odel parameters allow for quantitative agreement with experimental data.\n
 \nCo-authors: Sebastian Heidenreich (PTB Berlin)\, Knut Drescher (Princeto
 n University)\, Rik Wensink (CNRS Orsay)\, Markus Baer (PTB Berlin)\, Ray 
 Goldstein (University of Cambridge) \n\n
LOCATION:Seminar Room 1\, Newton Institute
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