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SUMMARY:Structure and dynamics of turbulent pipe flow - Duggleby\, A (Texa
 s A &amp\; M)
DTSTART:20080910T143000Z
DTEND:20080910T145000Z
UID:TALK13366@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Results of a proper orthogonal decomposition of a turbulent pi
 pe flow generated by direct numerical simulation are presented. The flow f
 ield is decomposed into its optimal basis functions as found by solving a 
 Fredholm integral whose kernel is the two-point velocity autocorrelation t
 ensor. The energy\, structure\, and dynamics of the basis functions are ex
 amined. The basis functions are categorised into two classes and six subcl
 asses based on their wavenumber and coherent vorticity structure\, and com
 pared to similar results found in turbulent channel flow. The turbulent pi
 pe flow is generated by a direct numerical simulation of the Navier-Stokes
  equations using a spectral element algorithm at a Reynolds number Re_tau=
 150 and a domain length of ten diameters (L/D=10). Evidence of very-large-
 scale motions will also be presented\, as well as preliminary results from
  a corresponding investigation using a new large-domain (L/D=100) simulati
 on.
LOCATION:Seminar Room 1\, Newton Institute
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