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Asymptotic intensity of the quasi-periodic oscillations in fully developed turbulent shear layers

Published online by Cambridge University Press:  21 April 2006

Anuvat Sirivat
Anuvat Sirivat
Affiliation:
Department of Mechanical Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA
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Abstract

Turbulent shear layers generated from a common splitter plate as well as from a half-frame screen are investigated experimentally in the developing regime and in the asymptotic regime. The phase-averaged means with time delay of velocity fluctuations are analysed in terms of Fourier modes in the frequency domain to give both the amplitude and frequency of the local fundamental mode due to the presence of the large-scale organized motion. The amplitudes of both the streamwise and the transverse components tend to relax to asymptotic values that are independent of the velocity ratio as well as the shear-layer apparatus. The Strouhal number St, defined as fL/Ua, where f is the local fundamental mode frequency, L is the shearlayer width and Ua, is the average convection velocity of the structures is found to be initially dependent on the local Reynolds number. In the asymptotic regime, the orientation of the large-scale structures is tilted backward toward the higher-speed side in all cases.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 191 , June 1988 , pp. 111 - 135
Copyright
© 1988 Cambridge University Press

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