Low-frequency fluctuations in the near-wake region of a trapezoidal cylinder with low aspect ratio

J. J. Miau, J. T. Wang, J. H. Chou, C. Y. Wei

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16 Citations (Scopus)

Abstract

Base pressure signals obtained on a trapezoidal cylinder with an aspect ratio 4.7, at Reynolds numbers of the order of 104, were examined after being low-pass filtered at different cut-off frequencies. For the range of the Reynolds numbers studied, the integral time scales of the low-passed fluctuations versus the cut-off frequencies chosen was found to fall on a curve. Cross-correlation between the pressure fluctuations measured at the cylinder base and the velocity fluctuations detected in the near-wake region were examined with the signal traces low-passed at different cut-off frequencies. Accordingly, an optimal cut-off frequency was defined as the one corresponding to the highest correlation obtained. The integral time scale of the low-passed fluctuations in reference to the optimal cut-off frequency was found to be about two times the vortex-shedding period. The low-frequency variations measured appeared to be insensitive to the artificial tripping to the sidewall boundary layer, and exhibited a global behavior in a near-wake region.

Original languageEnglish
Pages (from-to)701-715
Number of pages15
JournalJournal of Fluids and Structures
Volume17
Issue number5
DOIs
Publication statusPublished - 2003 Apr

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

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