Journal of Fluid Mechanics



Turbulent energy dissipation in a wake


L. W. B.  Browne a1, R. A.  Antonia a1 and D. A.  Shah a1
a1 Department of Mechanical Engineering, University of Newcastle, NSW 2308, Australia

Article author query
browne lw   [Google Scholar] 
antonia ra   [Google Scholar] 
shah da   [Google Scholar] 
 

Abstract

The average turbulent energy dissipation is often estimated by assuming isotropy and measuring the temporal derivative of the longitudinal velocity fluctuation. In this paper, the nine major terms that make up the total dissipation have been measured in the self-preserving region of a cylinder wake for a small turbulence Reynolds number. The results indicate that local isotropy is not satisfied; the isotropic dissipation, computed by assuming isotropic relations, being smaller than the total dissipation by about 45% on the wake centreline and by about 80% near the wake edge. Indirect verification of the dissipation measurements is provided by the budget of the turbulent kinetic energy. This budget leads to a plausible distribution for the pressure diffusion term, obtained by difference.

(Published Online April 21 2006)
(Received April 30 1986)
(Revised November 5 1986)



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