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SUMMARY:Turbulent dynamics of pipe flows captured in a reduced model - Wil
 lis\, A (Bristol)
DTSTART:20080910T134000Z
DTEND:20080910T140000Z
UID:TALK13362@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Significant success has been achieved in recent years by a dyn
 amical systems approach to low Reynolds number turbulence\, particularly r
 egarding transition and their relation to coherent structures. Establishin
 g links with experiments and simulations of turbulent flows\, however\, ha
 s been stifled by the vastness of the number of degrees of freedom in real
  flows. This both serves to mask the underlying dynamics and renders the s
 imulations expensive. In plane Couette flows the Minimal Flow Unit was int
 roduced as a testing ground for probing transitional dynamics. For pipe fl
 ow we introduce a 2.5-dimensional model which preserves the key spatio-tem
 poral features -- localised puffs\, expanding slugs\, and long-term transi
 ents. Simulations within this model are already proving fruitful in direct
 ing parallel simulations in 3-dimensions\, which would otherwise prove cos
 tly to run without a clear target.
LOCATION:Seminar Room 1\, Newton Institute
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