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SUMMARY:Directed percolation transition to turbulence - Bjorn Hof (IST\, A
 ustria)
DTSTART:20171110T160000Z
DTEND:20171110T170000Z
UID:TALK86701@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:The transition to turbulence in simple shear flows (e.g. pipe\
 , channel and Couette flow) has remained an open problem for over a centur
 y. Typically here turbulence arises despite the linear stability of the la
 minar flow and results from perturbations of finite amplitude. Turbulence 
 at first appears in the form of localised patches (e.g. puffs\, spots or s
 tripes) which coexist with laminar flow\, resulting in complex\, disordere
 d flow patterns (spatio-temporal intermittency).  Individual turbulent dom
 ains can collapse or they can proliferate and seed other patches of turbul
 ence. The time scales on which flows evolve are extremely large and likewi
 se are the relevant length scales. Characterizing the transition process h
 ence requires experiments of very large aspect ratios and extremely long o
 bservation times. In detailed experiments and direct numerical simulations
  of Couette flow we could for the first time determine the critical expone
 nts that characterize this transition and show that it falls into the dire
 cted percolation universality class. 
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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