Characteristics of wall pressure fluctuations in separated and reattaching flows over a backward-facing step:
Part I. Time-mean statistics and cross-spectral analyses |
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Authors: | I Lee H J Sung |
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Institution: | (1) Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong Yusong-ku, Taejon, 305-701, Korea, KR |
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Abstract: | Laboratory measurements were made of wall pressure fluctuations in separated and reattaching flows over a backward-facing
step. An array of 32 microphones in the streamwise as well as the spanwise directions was utilized. The statistical properties
of pressure fluctations were scrutinized. Emphasis was placed on the flow inhomogeneity in the streamwise direction. One-point
statistics such as the streamwise distribution of rms pressure and autospectra were shown to be generally consistent with
the prior results. The peak frequency and the fall-off rate of autospectra demonstrated the shear layer-originated nature
of pressure fluctuations. The coherences and wavenumber spectra in the streamwise and spanwise directions were indicative
of the presence of dual modes in pressure; one is associated with the large-scale vortical structure in the low-frequency
region and the other is the boundary-layer-like decaying mode in the high-frequency region.
Received: 18 August 1999/Accepted: 17 May 2000 |
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