Dynamic Effects of Centrifugal Forces on Turbulence

[+] Author and Article Information
L. S. Yao, S. Ghosh Moulic

Mechanical and Aerospace Engineering Department, Arizona State University, Tempe, AZ 85287

J. Appl. Mech 63(1), 84-94 (Mar 01, 1996) (11 pages) doi:10.1115/1.2787214 History: Received June 08, 1994; Revised November 07, 1994; Online October 26, 2007


The dynamic effect of suddenly applied centrifugal forces on homogeneous and isotropic turbulence in the entrance region of a curved pipe is analyzed by a perturbation method. The model is for small-scale turbulence and is valid away from the pipe wall; hence is not restricted to a particular cross-sectional shape and can be applied even to external flows if the mean velocity profile is almost uniform, as in the region outside the turbulent boundary layer on a curved surface. The analysis indicates that the major effect of centrifugal forces is to generate pure turbulent shear and this effect is cumulative. Thus, an initially isotropic turbulence become anisotropic due to linear effects. This result is in contrast with the effect of solid-body rotation on isotropic turbulence, where rotation acts on an initially isotropic turbulence only through nonlinear interactions, and pure linear effects influence the double correlations only if the turbulence is initially anisotropic.

Copyright © 1996 by The American Society of Mechanical Engineers
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