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SUMMARY:MEchanics GAthering -MEGA- Seminar: Spots and stripes: How turbule
 nt-laminar patterns form in shear flows
DTSTART:20190523T161500
DTEND:20190523T173000
DTSTAMP:20261002T014607Z
UID:63edc167c295ffe497dfb19230c836b7f868f3337971b9b6efa5aa28
CATEGORIES:Conferences - Seminars
DESCRIPTION:Florian Reetz\, ECPS\, EPFL\nWhen laminar shear flows undergo
  the transition to turbulence\, patches of laminar and turbulent flow ofte
 n coexist in space. These patches may form robust turbulent-laminar patter
 ns. Prominent examples in wall-bounded shear flows are isolated turbulent 
 spots and regular oblique stripes. Both examples have been observed in man
 y experiments and simulations for more than 50 years\, but how turbulent f
 low self-organizes such patterns is poorly understood. Here\, we apply con
 cepts of nonlinear dynamical systems theory to two types of shear flows\, 
 plane Couette flow and inclined convection\, leading to a description of t
 urbulent-laminar spots and stripes in terms of their exact invariant state
 s. As exact solutions to the fully nonlinear governing equations\, these i
 nvariant states are important reference states for studying the complex dy
 namics of turbulence. Exact invariant states representing spots and stripe
 s arise in bifurcations of the systems that are associated to pattern form
 ing instabilities and explain the origin of turbulent-laminar patterns in 
 these shear flows.
LOCATION:MED 2 2423 https://plan.epfl.ch/?room=MED22423
STATUS:CONFIRMED
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