Wind tunnel experiments are carried out to investigate interference effect of wake body on cross flow vibration of a square cylinder in uniform flow. The side length d of the square cylinder is 26∼40 mm and the length le = 315 mm. As the wake body, a strip-plate of width w = d is set downstream the square cylinder with a gap s in cruciform arrangement. The length of the plate ld is varied from infinity, i.e. full measuring section height, to ld/d = 1. Both the Karman vortex excitation (K-VIV) and the galloping are suppressed by the ld/d = ∞ plate in the non-dimensional gap range of 1.6<s/d ≦ 4, although the mechanisms are completely different between the two oscillations. The longitudinal vortex excitation (L-VIV) found in the previous work is confirmed to be induced by the plate at around s/d = 1.4 for the systems with various dimensions and structure parameters. The K-VIV suppression effect is virtually the same for the wake plates with ld/d≧10, and becomes less definite for shorter plates when ld/d ≦ 6. The galloping suppression effect persists up to the shortest wake plate of ld/d = 1 at s/d<2. The L-VIV is observed for plates of ld/d≧6, with weaker degree for shorter plates. The K-VIV seems to be enhanced by ld/d = 2, 4, 6 plates at 1≦s/d≦2 (EK-VIV). By setting the wake plate with ld/d = 1 or 2 at s/d around 0.3, a new type of fluid-elastic vibration is induced as an interference effect of wake body (WBI-FEV). A method is presented to predict fluid-elastic vibrations to which the Van der Pol equation does not apply. The prediction by this method agrees well with measured WBI-FEV for the ld/d = 2 plate.
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ASME 2009 Pressure Vessels and Piping Conference
July 26–30, 2009
Prague, Czech Republic
Conference Sponsors:
- Pressure Vessels and Piping
ISBN:
978-0-7918-4367-3
PROCEEDINGS PAPER
Interference Effect of Wake Body on the Cross Flow Oscillation of a Square Cylinder in Uniform Flow Available to Purchase
Yusuke Kawabata,
Yusuke Kawabata
Nagaoka University of Technology, Nagaoka, Niigata, Japan
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Takeshi Haginoya,
Takeshi Haginoya
Nagaoka University of Technology, Nagaoka, Niigata, Japan
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Mizuyasu Koide,
Mizuyasu Koide
Niigata Sangyo University, Kashiwazaki, Japan
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Tsutomu Takahashi,
Tsutomu Takahashi
Nagaoka University of Technology, Nagaoka, Niigata, Japan
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Masataka Shirakashi
Masataka Shirakashi
Nagaoka University of Technology, Nagaoka, Niigata, Japan
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Yusuke Kawabata
Nagaoka University of Technology, Nagaoka, Niigata, Japan
Takeshi Haginoya
Nagaoka University of Technology, Nagaoka, Niigata, Japan
Mizuyasu Koide
Niigata Sangyo University, Kashiwazaki, Japan
Tsutomu Takahashi
Nagaoka University of Technology, Nagaoka, Niigata, Japan
Masataka Shirakashi
Nagaoka University of Technology, Nagaoka, Niigata, Japan
Paper No:
PVP2009-77358, pp. 229-238; 10 pages
Published Online:
July 9, 2010
Citation
Kawabata, Y, Haginoya, T, Koide, M, Takahashi, T, & Shirakashi, M. "Interference Effect of Wake Body on the Cross Flow Oscillation of a Square Cylinder in Uniform Flow." Proceedings of the ASME 2009 Pressure Vessels and Piping Conference. Volume 4: Fluid-Structure Interaction. Prague, Czech Republic. July 26–30, 2009. pp. 229-238. ASME. https://doi.org/10.1115/PVP2009-77358
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