Low-frequency modulations associated with vortex shedding due to flow over a bluff body

J. J. Miau, S. J. Wu, C. C. Hu, J. H. Chou

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The characteristic behaviors of low-frequency modulations embedded in the vortex shedding process were studied experimentally with a trapezoidal cylinder situated in a low-speed wind tunnel. Hot-wire signals and smoke-wire visualization images were acquired simultaneously to examine the correlation between low-frequency modulations and the vortex formation length. Wavelet analysis was performed to extract the instantaneous properties from the raw signals obtained in the region upstream of the trapezoidal cylinder model. Results show that the variations of instantaneous vortex shedding frequency in time appear to be in negative correlation with the low-frequency modulations, that the cross-correlation coefficient can reach -0.5 in value. This substantiates that the low-frequency modulations observed are associated with the vortex shedding process.

Original languageEnglish
Title of host publication41st Aerospace Sciences Meeting and Exhibit
Publication statusPublished - 2003 Dec 1
Event41st Aerospace Sciences Meeting and Exhibit 2003 - Reno, NV, United States
Duration: 2003 Jan 62003 Jan 9

Publication series

Name41st Aerospace Sciences Meeting and Exhibit

Other

Other41st Aerospace Sciences Meeting and Exhibit 2003
CountryUnited States
CityReno, NV
Period03-01-0603-01-09

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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    Miau, J. J., Wu, S. J., Hu, C. C., & Chou, J. H. (2003). Low-frequency modulations associated with vortex shedding due to flow over a bluff body. In 41st Aerospace Sciences Meeting and Exhibit (41st Aerospace Sciences Meeting and Exhibit).