Active control of vortex shedding and fluid-dynamic forces on a square cylinder by micro-excitation of sidewall surfaces

Manabu Oda, Yoshihisa Yamamoto, Atsushi Takaki, Masato Furukawa, Masahiro Inoue

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The experimental studies on active control of vortex shedding frequency were conducted to suppress fluid-dynamic forces of a square cylinder. Each sidewall of the cylinder consists of four vibrating side-plates equipped with piezoelectric actuators. The vortex shedding frequency was controlled by means of a lock-in phenomenon that was caused by vibrating the side-plates transversely with amplitude less than 100 μm. The results are summarized as follows: (1) the spanwise synchronous excitation brings about reduction of the time-averaged drag coefficient C d . It is reduced by approximately 20% of the natural condition. (2) When a half span of sidewall surface is vibrated with 180 degrees differential phase against the other half span, the vortices shed from each half span in the reversal phase mode. The fluctuating lift coefficient C i ' is reduced by approximately 70% of the natural condition with the reversal phase mode.

Original languageEnglish
Pages (from-to)579-585
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume70
Issue number691
DOIs
Publication statusPublished - Jan 1 2004

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vortex shedding
Vortex shedding
active control
fluid dynamics
Fluid dynamics
Piezoelectric actuators
Drag coefficient
excitation
lift coefficients
Vortex flow
drag coefficients
piezoelectric actuators
vortices

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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abstract = "The experimental studies on active control of vortex shedding frequency were conducted to suppress fluid-dynamic forces of a square cylinder. Each sidewall of the cylinder consists of four vibrating side-plates equipped with piezoelectric actuators. The vortex shedding frequency was controlled by means of a lock-in phenomenon that was caused by vibrating the side-plates transversely with amplitude less than 100 μm. The results are summarized as follows: (1) the spanwise synchronous excitation brings about reduction of the time-averaged drag coefficient C d . It is reduced by approximately 20{\%} of the natural condition. (2) When a half span of sidewall surface is vibrated with 180 degrees differential phase against the other half span, the vortices shed from each half span in the reversal phase mode. The fluctuating lift coefficient C i ' is reduced by approximately 70{\%} of the natural condition with the reversal phase mode.",
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AU - Oda, Manabu

AU - Yamamoto, Yoshihisa

AU - Takaki, Atsushi

AU - Furukawa, Masato

AU - Inoue, Masahiro

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