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Proper orthogonal decomposition of an axisymmetric turbulent wake behind a disk
A proper orthogonal decomposition (POD) study of the axisymmetric turbulent wake behind a disk has been performed using multipoint hot-wire data. The Reynolds number based on the free stream velocity ...
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Application of a "slice" proper orthogonal decomposition to the far field of an axisymmetric turbulent jet

Phys. Fluids 14, 2515 (2002); doi:10.1063/1.1471875

Published 5 June 2002

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Stephan Gamard and William K. George
Turbulence Research Laboratory, Department of Thermo and Fluid Dynamics, Chalmers University of Technology, SE-41 296 Gothenburg, Sweden

Daehan Jung
Department of Mechanical Engineering, Korean Air Force Academy, Cheongwon, Chungbuk 363-849, Korea

Scott Woodward
Department of Mechanical and Aerospace Engineering, University at Buffalo, Buffalo, New York 14260
Instantaneous measurements of the streamwise velocity component were obtained in the far field region of an axisymmetric turbulent jet at exit Reynolds numbers ranging from 40 000 to 84 700. The data were taken from 20 to 69 diameters downstream of the jet exit using 138 hot-wires. The proper orthogonal decomposition was applied to a double Fourier transform in time and azimuthal direction of the two-point velocity correlation tensor. The first eigenspectrum, which contains more than 60% of the kinetic energy, has two peaks: A dominant peak at azimuthal mode-2 at near zero frequency, and a secondary peak at mode-1 at a local Strouhal number (fx/Uc) of approximately 1. The most striking feature was the general behavior of the eigenspectra: when normalized to reflect the energy repartition per mode number only, they peaked at mode-2, and were independent of downstream position in the experiment considered. They were also similar in nature to those obtained in earlier experiments at x/D = 6, just past the end of the potential core, but distinctly different from those closer to the jet exit where mode-0 and higher modes dominated. ©2002 American Institute of Physics.
History: Received 24 September 2001; accepted 4 March 2002; published 5 June 2002
Permalink: http://link.aip.org/link/?PHFLE6/14/2515/1
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KEYWORDS and PACS

Keywords
PACS
  • 47.27.Wg
    Fluid dynamics Turbulent flows, convection, and heat transfer Jets
  • 47.27.-i
    Fluid dynamics Turbulent flows, convection, and heat transfer
  • 02.30.Nw
    Mathematical methods in physics Function theory, analysis Fourier analysis
  • 02.30.Uu
    Mathematical methods in physics Function theory, analysis Integral transforms
  • YEAR: 2002

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PUBLICATION DATA

ISSN:
1070-6631 (print)   1089-7666 (online)
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