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Effects of imperfect spatial resolution on measurements of wall-bounded turbulentbx shear flows

Published online by Cambridge University Press:  20 April 2006

Arne V. Johansson  and
P. Henrik Alfredsson
Arne V. Johansson
Affiliation:
Department of Mechanics, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
P. Henrik Alfredsson
Affiliation:
Department of Mechanics, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
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Abstract

The effects of imperfect spatial resolution on hot-film and hot-wire measurements of wall-bounded turbulent shear flows were studied. Two hot-film probes of different length were used for measurements of fully developed turbulent channel flow in a water tunnel. In the near-wall region significant effects of spanwise spatial averaging due to finite probe size were found for a probe 32 viscous units long. The maximum turbulence intensity attained a 10% lower value than that for a probe about half as long, and the zero-crossing of the skewness factor was shifted away from the wall. This could be attributed to spatial averaging of narrow low-speed regions. Results for different Reynolds numbers, but with the same sensor length in viscous units, showed that Reynolds-number effects are small, and that much of the reported discrepancies for turbulence measurements in the near-wall region can be ascribed to effects of imperfect spatial resolution. Also the number of events detected with the variable-interval time-averaging (VITA) technique was found to depend strongly on the sensor length, especially for events with short duration.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 137 , December 1983 , pp. 409 - 421
Copyright
© 1983 Cambridge University Press

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