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Experimental investigation of the structure of large- and very-large-scale motions in turbulent pipe flow

Published online by Cambridge University Press:  24 March 2010

SEAN C. C. BAILEY*
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544USA
ALEXANDER J. SMITS
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544USA
*
Present address: Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506, USA. Email address for correspondence: scbailey@engr.uky.edu

Abstract

Multi-point velocity measurements have been performed in turbulent pipe flow at ReD = 1.5 × 105 and combined with cross-spectral and proper orthogonal decomposition analysis to elucidate information on the structure of the large- and very-large-scale motions in the outer layer of wall-bounded flows. The results indicate that in the outer layer the large-scale motions (LSM) may be composed of detached eddies with a wide range of azimuthal scales, whereas in the logarithmic layer they are attached. The very-large-scale motions (VLSM) have large radial scales, are concentrated around a single azimuthal mode and make a smaller angle with the wall compared to the LSM. The results support a hypothesis that only the detached LSM in the outer layer align to form the VLSM.

Type
Papers
Copyright
Copyright © Cambridge University Press 2010

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