Flow-Induced Vibration of a Bluff Body

Okajima, Atsushi

doi:10.1299/jsmemecjsm.vii.01.1.0_7

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“…Griffin and Hall (5) reported about features of vortex shedding that imposed in-line, cross-flow and rotational oscillations and near-wake flow stability. In recent years, the review and the view about the flow-induced vibration including the lock-in phenomenon was reported by Okajima (6), (7) . Yokoi et al (8) investigated the effect of cylinder oscillation on vortex shedding and they show the flow pattern distribution in the lock-in region by flow Fig.1 The cover shot and the drawing of the towing water tank visualization.…”

Section: Introductionmentioning

confidence: 99%

Vortex Shedding and Vortex Formation from a Pair of In-Line Forced Oscillating Parallel Arranged Two Circular Cylinders (In the Case of Unequal Diameter)

Yokoi

Hirao²

2009

JFST

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In this study, the flow features of vortex shedding from a pair of parallel arranged circular cylinders of unequal diameter oscillating along the direction of the flow were observed by visualizing water flow experiment at the ranges of the frequency ratio f/f K =0~7, amplitude ratio 2a/d=0.125, 0.25, 0.5 and 0.75, gap ratio G/d=0.25, 0.75 and 1.75, diameter ratio d'/d=0.25 and 0.5 and Reynolds number Re=500. The variations of mean vortex shedding frequency from oscillating cylinder were investigated. As a result of the experiments, the occurrence of the lock-in phenomenon and its range were shown. It was obtained that the states of the interference flow at the time of lock-in by the cylinder oscillation. Some representative flow patterns were obtained. It was shown that the stage number of flow pattern was depended on the gap ratio G/d.

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Section: Introductionmentioning

confidence: 99%