Large-scale Structures in the Wake behind a Circular Cylinder

The authors have reported that the two-dimensional Karman vortices behind a cicular cylinder are broken into lengths of about 8d and form chains of spoon-shaped vortex couples. In the present experiment disks were attatched to the cylinder so that the Karman vortices were artificially cut at fixed p...

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Bibliographic Details
Published inNihon Kikai Gakkai rombunshuu. B hen Vol. 52; no. 475; pp. 1255 - 1260
Main Authors YAMANE, Ryuichiro, TANAKA, Yutaka, MOCHIMARU, Yoshihiro, YAGITA, Miki, SHIRAKASHI, Masataka
Format Journal Article
LanguageJapanese
Published The Japan Society of Mechanical Engineers 01.01.1986
Subjects
cylinders
fluid mechanics
turbulence
vortices
Wake
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Summary:The authors have reported that the two-dimensional Karman vortices behind a cicular cylinder are broken into lengths of about 8d and form chains of spoon-shaped vortex couples. In the present experiment disks were attatched to the cylinder so that the Karman vortices were artificially cut at fixed positions with fixed lengths of 4d, 4d, 8d and 10d. The structures with 8d were most stable, forming the vortex chains with least irregularities, and the wake was much wider than that without the disks, while the neighbouring vortices with a length 4d were merged to the scale of about 8d. There results show that the length 8d is a unique scale in the deformation of the Karman vortices to the three-dimensional large-scale structure.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0387-5016
1884-8346
DOI:10.1299/kikaib.52.1255