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ON THE SPATIAL STRUCTURE OF TURBULENCE IN OPEN CHANNEL FLOWS

By 博健 今本, 鉄男 上野 and 富夫 浅野

Abstract

The time-space structure of the turbulence field in a two-dimensional free surface shear flow wastreated by means of the technique of time-space correlation coefficient, with and without filtering, for the longitudinal component of turbulent velocity.The characteristics of time-space correlation coefficient of filtered turbulent velocity are describ-ed by the characteristies of auto- and optimum-correlation coefficients and optimum lag-times atwhich the time-space correlation coefficients reach the maximum values. Furthermore, the charac-teristics of auto-correlation coefficient of filtered turbulent velocity are described by the continuationtime which represents the damping characteristins of the auto-correlation coefficient, and that ofoptimum-correlation coefficient are described by its integral scale.Turbulence measurement were carried out in a laboratory channel using two hot-film flowmetersto investigate the characteristics of the tinse-space structure of the turbulence field, and some in-teresting results about the continuation time, optimum integral scales and optimum lag-times, inlongitudinal, lateral and vertical derections, were obtained.The time-space structure of the turbulence field in a two-dimensional free surface shear flow wastreated by means of the technique of time-space correlation coefficient, with and without filtering,for the longitudinal component of turbulent velocity.The characteristics of time-space correlation coefficient of filtered turbulent velocity are describ-ed by the characteristies of auto- and optimum-correlation coefficients and optimum lag-times atwhich the time-space correlation coefficients reach the maximum values. Furthermore, the charac-teristics of auto-correlation coefficient of filtered turbulent velocity are described by the continuationtime which represents the damping characteristins of the auto-correlation coefficient, and that ofoptimum-correlation coefficient are described by its integral scale.Turbulence measurement were carried out in a laboratory channel using two hot-film flowmetersto investigate the characteristics of the tinse-space structure of the turbulence field, and some in-teresting results about the continuation time, optimum integral scales and optimum lag-times, inlongitudinal, lateral and vertical derections, were obtained

Topics: 517.1
Publisher: Disaster Prevention Research Institute Kyoto University
Year: 1973
OAI identifier: oai:repository.kulib.kyoto-u.ac.jp:2433/69867
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