Effect of spacing between two adjoining square cylinders on flow around two-dimensional square cylinder row supported by elastic plate springs

Shiki Okamoto, Fujio Ishii, Masahiko Aichi, Toshiyuki Masuda, Yoko Yamanishi

Research output: Contribution to journalArticle

Abstract

In this paper we describe the effect of spacing between two adjoining square cylinders on flow around two-dimensional square cylinder row supported by plate springs. The experiment was carried out in an N. P. L. blow-down-type wind tunnel with a working section of 500 mm × 500 mm× 2 000 mm, and a Reynolds number of 9.4 × 103. The frequency of vortex shedding from the square cylinder, the displacement of the vibrating square cylinder, and the time mean and fluctuating surface pressure distributions on the square cylinder were measured. Consequently it was found that (i) vortex shedding from square cylinders occurs in the range of spacing ratio S/D≥1.7, while there is two patterns regarding the existence of vortices shedding from square cylinders in the range of 1.7 ≤S/D≤2.5, (ii) the displacement of vibrating cylinder due to the shedding vortices attains maximum at S/D=3, (iii) the fluctuating pressure distribution on the surface and fluctuating lift by frequency of shedding vortices become largest at S/D=3.

Original languageEnglish
Pages (from-to)25-33
Number of pages9
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume64
Issue number617
DOIs
Publication statusPublished - Jan 1 1998
Externally publishedYes

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elastic plates
Vortex shedding
spacing
vortex shedding
Pressure distribution
pressure distribution
Wind tunnels
Reynolds number
wind tunnels
Experiments

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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title = "Effect of spacing between two adjoining square cylinders on flow around two-dimensional square cylinder row supported by elastic plate springs",
abstract = "In this paper we describe the effect of spacing between two adjoining square cylinders on flow around two-dimensional square cylinder row supported by plate springs. The experiment was carried out in an N. P. L. blow-down-type wind tunnel with a working section of 500 mm × 500 mm× 2 000 mm, and a Reynolds number of 9.4 × 103. The frequency of vortex shedding from the square cylinder, the displacement of the vibrating square cylinder, and the time mean and fluctuating surface pressure distributions on the square cylinder were measured. Consequently it was found that (i) vortex shedding from square cylinders occurs in the range of spacing ratio S/D≥1.7, while there is two patterns regarding the existence of vortices shedding from square cylinders in the range of 1.7 ≤S/D≤2.5, (ii) the displacement of vibrating cylinder due to the shedding vortices attains maximum at S/D=3, (iii) the fluctuating pressure distribution on the surface and fluctuating lift by frequency of shedding vortices become largest at S/D=3.",
author = "Shiki Okamoto and Fujio Ishii and Masahiko Aichi and Toshiyuki Masuda and Yoko Yamanishi",
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AU - Okamoto, Shiki

AU - Ishii, Fujio

AU - Aichi, Masahiko

AU - Masuda, Toshiyuki

AU - Yamanishi, Yoko

PY - 1998/1/1

Y1 - 1998/1/1

N2 - In this paper we describe the effect of spacing between two adjoining square cylinders on flow around two-dimensional square cylinder row supported by plate springs. The experiment was carried out in an N. P. L. blow-down-type wind tunnel with a working section of 500 mm × 500 mm× 2 000 mm, and a Reynolds number of 9.4 × 103. The frequency of vortex shedding from the square cylinder, the displacement of the vibrating square cylinder, and the time mean and fluctuating surface pressure distributions on the square cylinder were measured. Consequently it was found that (i) vortex shedding from square cylinders occurs in the range of spacing ratio S/D≥1.7, while there is two patterns regarding the existence of vortices shedding from square cylinders in the range of 1.7 ≤S/D≤2.5, (ii) the displacement of vibrating cylinder due to the shedding vortices attains maximum at S/D=3, (iii) the fluctuating pressure distribution on the surface and fluctuating lift by frequency of shedding vortices become largest at S/D=3.

AB - In this paper we describe the effect of spacing between two adjoining square cylinders on flow around two-dimensional square cylinder row supported by plate springs. The experiment was carried out in an N. P. L. blow-down-type wind tunnel with a working section of 500 mm × 500 mm× 2 000 mm, and a Reynolds number of 9.4 × 103. The frequency of vortex shedding from the square cylinder, the displacement of the vibrating square cylinder, and the time mean and fluctuating surface pressure distributions on the square cylinder were measured. Consequently it was found that (i) vortex shedding from square cylinders occurs in the range of spacing ratio S/D≥1.7, while there is two patterns regarding the existence of vortices shedding from square cylinders in the range of 1.7 ≤S/D≤2.5, (ii) the displacement of vibrating cylinder due to the shedding vortices attains maximum at S/D=3, (iii) the fluctuating pressure distribution on the surface and fluctuating lift by frequency of shedding vortices become largest at S/D=3.

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