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SUMMARY:Repeller or attractor? Selecting the dynamical model of shear flow
  turbulence - Hof\, B (Mathematisches Institut\, Gttingen)
DTSTART:20080909T090000Z
DTEND:20080909T092000Z
UID:TALK13348@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The collapse of turbulence\, observable in shear flows at low 
 Reynolds numbers\, raises the question if turbulence is generically of tra
 nsient nature or becomes sustained at some critical point. Recent data hav
 e lead to conflicting views with the majority of studies supporting the mo
 del of turbulence turning into an attracting state. Here we present lifeti
 me measurements of turbulence in pipe flow spanning eight orders of magnit
 ude in time\, drastically extending all previous investigations. We show t
 hat no critical point exists in this regime and that in contrast to the pr
 evailing view the turbulent state remains transient. The observed transien
 t scaling behaviour has been conjectured to occur in turbulent flows more 
 than two decades ago.
LOCATION:Seminar Room 1\, Newton Institute
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