Near wake behind square cylinder of finite length on ground plane

Shiki Okamoto, Kazumi Tsunoda, Tokujiro Takagi, Eiji Okada, Kenichi Kitani

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This paper describes an experimental study on the process involved in the disappearance of arch vortices shed from a square cylinder of finite length, and the accompanying changes in the turbulent near wake, as a function of the aspect ratio of a square cylinder. The experiment was carried out in a circuit-type wind tunnel having a 200 mm×200 mm working section of 2 000 mm length at the Reynolds number Re of 9 200. The time-mean velocity and turbulence intensities were measured by a laser Doppler velocimeter. Vortex formation was observed by flow visualization in a water channel at Re = 4 600. Consequently, details of the flow pattern in the turbulent near wake behind a square cylinder were obtained, such as information on shedding arch vortices and horseshoe vortices. The aspect ratio for generating arch vortices seems to be higher than H/D = 0.7, whereas the horseshoe vortices are generated around a square cylinder for all aspect ratios studied here.

Original languageEnglish
Pages (from-to)3105-3113
Number of pages9
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume61
Issue number589
Publication statusPublished - 1995 Sep
Externally publishedYes

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near wakes
Vortex flow
arches
vortices
turbulent wakes
horseshoe vortices
Arches
aspect ratio
Aspect ratio
laser doppler velocimeters
flow visualization
Laser Doppler velocimeters
wind tunnels
Flow visualization
Reynolds number
flow distribution
Flow patterns
Wind tunnels
turbulence
Turbulence

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Near wake behind square cylinder of finite length on ground plane. / Okamoto, Shiki; Tsunoda, Kazumi; Takagi, Tokujiro; Okada, Eiji; Kitani, Kenichi.

In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 61, No. 589, 09.1995, p. 3105-3113.

Research output: Contribution to journalArticle

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