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The far downstream evolution of the high-Reynolds-number axisymmetric wake behind a disk. Part 1. Single-point statistics

Published online by Cambridge University Press:  11 May 2006

PETER B. V. JOHANSSON  and
WILLIAM K. GEORGE
PETER B. V. JOHANSSON
Affiliation:
Turbulence Research Laboratory, Department of Applied Mechanics, Chalmers University of Technology, Gothenburg, SE-412 96, Sweden
WILLIAM K. GEORGE
Affiliation:
Turbulence Research Laboratory, Department of Applied Mechanics, Chalmers University of Technology, Gothenburg, SE-412 96, Sweden
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Abstract

The high-Reynolds-number axisymmetric wake behind a disk has been studied for $10 \leq x/D \leq 150$ ($36 \leq x/\theta \leq 552 $) using a rake of 15 hot wires. The disk had a diameter of 20 mm, and the Reynolds number based on the free-stream velocity was 26 400. Mean velocity profiles, root-mean-square profiles, and power spectra are presented. By using regression techniques to fit the velocity profiles it was possible to obtain accurate velocity centreline deficits and transverse length scales to even the last downstream position. Beyond the initial region which extends to $x/D=30$, the data are in excellent agreement with the high-Reynolds-number equilibrium similarity solution.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 555 , 25 May 2006 , pp. 363 - 385
Copyright
© 2006 Cambridge University Press

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