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RESEARCH PAPERS

Decay of Turbulence in Axisymmetric Wakes

[+] Author and Article Information
N. H. C. Hwang

Fluid Dynamics and Diffusion Laboratory, Colorado State University, Fort Collins, Colo.

L. V. Baldwin

College of Engineering, Fluid Dynamics and Diffusion Laboratory, Colorado State University, Fort Collins, Colo.

J. Basic Eng 88(1), 261-267 (Mar 01, 1966) (7 pages) doi:10.1115/1.3645824 History: Received January 22, 1965; Online November 03, 2011

Abstract

Turbulent wakes formed downstream of flat, circular disks were surveyed with hot-wire anemometers in a low-speed wind tunnel. Three regions were discernible in the wake. Between the disk and x = 50 disk diameters D downstream, the turbulence was highly anisotropic and new turbulence was generated locally. An approximate similarity region (100 ≲ x/D ≲ 400) existed where isotropic turbulence relations were adequate for estimating decay. The far downstream wake (x/D ≳ 400) was highly intermittent throughout; the decay rate lessened in this final period. Over a 4-fold range of disk size and a 7 1/2 -fold range of mean flow velocity, Taylor’s microscale was correlated by the mean residence time x/U∞ ; this relation was independent of disk size.

Copyright © 1966 by ASME
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