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SUMMARY:Enhanced Diffusion of Tracers in Microswimmer Suspensions: ``Bacte
 ria Never Swim Alone&quot\;   - Cesare Nardini\, CEA Saclay
DTSTART:20180515T120000Z
DTEND:20180515T130000Z
UID:TALK104905@talks.cam.ac.uk
CONTACT:Professor Mike Cates
DESCRIPTION:Dilute suspensions of microswimmers show intriguing collective
  phenomena such as bacterial turbulence\, where they self-organise in larg
 e scale chaotic structures. In this talk I will discuss a more subtle coll
 ective effect arising at lower densities when\, in average\, the suspensio
 n is homogeneous and isotropic. In particular\, I will focus on the diffus
 ion of passive tracers immersed in the suspension and on the statistics of
  the fluid velocity\, discussing their non-trivial density dependence.\nI 
 will present analytical results obtained using a kinetic theory approach t
 hat is non-perturbative in the swimmer density. The theory is in quantitat
 ive agreement with lattice Boltzmann simulations and captures the asymmetr
 y between pusher and puller swimmers far below the transition to turbulenc
 e.\n\nThe talk is based on PRL 119\, 028005 (2017). \nCollaborators: J Ste
 nhammar\, RW Nash\, D Marenduzzo\, A Morozov. \n\n
LOCATION:MR11\, CMS
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