会議発表論文 Properties of wake excitation of circular cylinder

Nagao, Fumiaki  ,  Noda, Minoru  ,  Inoue, Masahiro  ,  Matsukawa, Shota  ,  Shitamori, Akihiro  ,  長尾, 文明  ,  野田, 稔  ,  井上, 真尋  ,  松川, 将太  ,  下森, 章弘

内容記述
The wake excitation of close-spaced tandem or staggered circular cylinders is known to develop from the interaction between the leeward circular cylinder and wake flow of the windward circular cylinder. However, this phenomenon is strongly influenced by the Reynolds number, which controls the flow around the cylinders, and by the arrangement of the circular cylinders. Experiments were performed to investigate the wake-induced vibrations of circular cylinders arranged in tandem with a central distance of three diameters and having several kinds of surface roughness. For smooth circular cylinders, two types of stable limit cycles for the transverse response were measured. The larger response, which had a double amplitude of about three diameters (2Y/D approximately equal to 3), was much more sensitive to the Scruton number and surface roughness of the cylinders. The smaller response (2Y/D = 1-1.25) was closely related to the separated flow from the windward cylinder. The Reynolds number was found to have a relatively large effect on wake galloping. The surface roughness of the leeward circular cylinder played a more important role in wake galloping than that of the windward circular cylinder. However, installing helical wires on both cylinders produced a synergistic stabilizing effect. The effect of the Reynolds number on the wake excitation was investigated over the critical Re range.
Meeting Information: First International Symposium on Flutter and its Application (May 15-17, 2016. Mielparque-tokyo), Minato-ku, Tokyo, Japan
Physical characteristics: Original contains color illustrations
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https://repository.exst.jaxa.jp/dspace/bitstream/a-is/612468/1/AA1630046037.pdf

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