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Structure of space-time correlations of bursting phenomena in an open-channel flow

Published online by Cambridge University Press:  20 April 2006

Hiroji Nakagawa  and
Iehisa Nezu
Hiroji Nakagawa
Affiliation:
Department of Civil Engineering, Kyoto University, Kyoto 606, Japan
Iehisa Nezu
Affiliation:
Department of Civil Engineering, Kyoto University, Kyoto 606, Japan
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Abstract

The present study is to investigate the structure of space-time correlations of bursting motions, such as ejections and sweeps in an open-channel flow, by a new conditional sampling analysis of the instantaneous velocity and Reynolds-stress signals measured simultaneously by two dual-sensor hot-film probes. One probe was fixed near the edge of the buffer layer, while the other probe was moved in the streamwise, vertical and spanwise directions. The sorted instantaneous Reynolds-stress signals obtained from the fixed probe were used as a detecting information of the occurrences of ejection or sweep events. The streamwise and vertical spatial characteristics of the ejection-sweep motions, and their convection process are investigated in detail. Also, the spanwise spatial properties of the high- and low-speed streaks in the bursting motions are examined experimentally by the present conditional sampling method.

Next, a qualitative model is proposed which attempts to explain the space-time structures of the bursting phenomenon, on the basis of the above anemometry information and other visual observations.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 104 , March 1981 , pp. 1 - 43
Copyright
© 1981 Cambridge University Press

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