Abstract
In this paper, flow-induced vibrations of bluff bodies with four different cross-sectional geometries (circle, square, triangle and semi-circle) arranged both in single and tandem (gap ratio equals to 3 and 5) configurations are investigated in a wind tunnel. It is found that triangular and square cylinders have the higher amplitude than that of the semi-circular and the circular cylinders in the single configuration. When two cylinders are arranged in tandem, the circular cylinders have the highest amplitude among all tested cylinders. Furthermore, the semi-circular cylinder shows that its vibrating amplitude increases with the reduced velocity in the tandem system due to the galloping effect.
Highlights
The rapid growth of energy demand and the increasing concern of environmental degradation have attracted significant attention on renewable energy in recent years
Various approaches for extracting fluid energy are being actively explored. One of these is to utilize the phenomenon of flowinduced vibrations (FIV), which include vortexinduced vibrations (VIV), galloping and wake-induced vibration (WIV), of a bluff structure to extract electrical energy from hydro-kinetic energy
Approaches on how to harness this kind of energy have attracted significant attention in recent years and substantial devices have been designed so far. One such example is the VortexInduced Vibration for Aquatic Clean Energy (VIVACE) converter with a circular cylinder subjected to a cross flow [3]
Summary
The rapid growth of energy demand and the increasing concern of environmental degradation have attracted significant attention on renewable energy in recent years. Unlike VIV, galloping is a velocity-dependent hydro-elastic instability characterized by lower frequencies and larger amplitudes than VIV [1] This vibration response is significantly increased with the growth of the flow speed. Approaches on how to harness this kind of energy have attracted significant attention in recent years and substantial devices have been designed so far. One such example is the VortexInduced Vibration for Aquatic Clean Energy (VIVACE) converter with a circular cylinder subjected to a cross flow [3]. The geometry of the upstream and the downstream cylinders is kept the same in each test
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