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Propagation of perturbations in the viscous sublayer and adjacent wall region

Published online by Cambridge University Press:  19 April 2006

Hans-Peter Kreplin  and
Helmut Eckelmann
Hans-Peter Kreplin
Affiliation:
Max-Planck-Institut für Strömungsforschung D 3400 Göttingen, West Germany Present address: DFVLR-AVA Göttingen, D 3400 Göttingen.
Helmut Eckelmann
Affiliation:
Max-Planck-Institut für Strömungsforschung D 3400 Göttingen, West Germany
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Abstract

The fluctuating velocity components, u and w, and their gradients at the wall, \[ (\partial u/\partial y)|_{w}\quad {\rm and}\quad (\partial w/\partial y)|_{w}, \] were measured in a fully developed turbulent channel flow using hot-film probes. The data were taken in an oil channel at a low Reynolds number which allowed velocity measurements very close to the wall. From simultaneous measurements of these signals it could be deduced that coherent flow structures, inclined to the wall, travel downstream. Space-time correlations imply that these are rotating structures. The spanwise distance between these structures was found to be z+ ≈ 50 and they could be observed over a streamwise distance of Δx+ > 1000.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 95 , Issue 2 , 28 November 1979 , pp. 305 - 322
Copyright
© 1979 Cambridge University Press

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