Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering ConferenceShanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Energy harvesting by applying VIV with a circular cylinder and galloping with a triangle cylinder in a
low-speed water flume
Yu Shen1, Jiasong Wang1,2
1School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai, China.
2MOE Key Laboratory of Hydrodynamics, Shanghai Jiao Tong University, Shanghai, China

ABSTRACT

made.

This paper presents energy harvesting results by applying vortexinduced vibration (VIV) and galloping excited with a circular cylinderand a triangular cylinder, respectively in a low-speed water flume. The
voltage and power were obtained by the energy harvesters under
different resistances (0- ∞ ) and flow velocities (0.05~0.35m/s). The
results demonstrate that for the VIV harvester, when the flow velocity
increases, the voltage and power of the cylindrical cantilever beamincrease initially, then decrease. The harvested maximum power density
is 97.09μW/cm3 at the flow velocity of 0.16m/s. For the galloping
harvester, the voltage and power of the triangular cylinder cantilever
beam increase with the increase of flow velocity. The harvested
maximum power density is 502.04μW/cm3 at the flow velocity of0.35m/s. The triangular cylindrical cantilever beam has better
performance in energy collection efficiency because of applying thegalloping response of structure.

At present, main energy source of piezoelectric energy acquisition
device is flow-induced vibration, including VIV, galloping and flutter.
Bernitsas et al. (2008) gave out that the characteristics of VIV power
generation devices as energy collection, are of high energy density, lowmaintenance costs, and a life cycle of 10-20 years. The vortex induced
vibration aquatic clean energy (VIVACE) converter was first proposed
and applied for a patent. Lan et al. (2019) conducted dynamic modelingof VIV energy collection. Wang et al. (2020a) modeled and simulated
the vortex induced vibration generator to improve the vortex induced
vibration of the cylinder, and applied an additional rod to improve thepower output. Zhou and Wang (2018) proposed the application of double
series cylinders to improve VIV power generation. Qin et al. (2019), Sunet al. (2019) respectively carried out the researches on VIV piezoelectricenergy devices.
In order to improve the efficiency of energy acquisition, researchersbegan to pay attention to galloping power generation devices. Zhang etal. (2017) used two-dimensional numerical simulation to study theparallel arrangement of two blocks in the VIV capture device with thespacing of 2-50 diameters, and studied the influence of bluff bodies withdifferent cross-section shapes respectively. Wang et al. (2018)
innovationally applied the Scanlan-Ehsan (S-E) model, a semi-empiricalmodel for bridge wind resistance engineering, to describe an aeroelectromechanical coupling problem with different cross-sectional
shapes model under galloping. In order to improve the performance oflow-speed wind energy acquisition, other researchers have studied
galloping energy harvesting devices, and put forward constructive
suggestions (Abdelkefi et al., 2013; Ewere and Wang, 2013; Javed et al.,2015; Wang et al., 2020b; Wang et al., 2020c; Zhao et al., 2020; Zhu etal., 2020) . However, there are few comprehensive and systematicstudies on the influence of different resistance load and cross section
cylinder on energy collection at different flow velocity. This paper
mainly studies the influence of two types of cross-sectional shapes(circular and triangular) attached to the free end of vertical cantilever
beam on energy collection under the same mass ratio, different flow
velocities and external resistance loads. VIV and galloping convert theKEY WORDS: energy harvesting; vortex-induced vibration
harvester; galloping harvester; power density; cantilever beam.
INTRODUCTION
Due to the decreasing of non-renewable energy and the harm of fuel cellto environment, more and more researchers pay attention to thedevelopment and utilization of renewable energy. At present, moremature power generation methods mainly by applying solar energy, tidalenergy, wind energy, etc, are proposed for the power supply of highpower electrical devices. However, with the development ofminiaturized sensor networks, micro-electromechanical systems(MEMS) and Internet of Things to use the inexhaustible energy in thesurrounding environment, piezoelectric materials have gradually
become a research hotspot (Azizi et al., 2016; Mohanty et al. 2019).
Pillatsch et al.(2016). The power density of piezoelectric materials in the
micro energy capture system is much higher than that of other energy
collection methods and is better in economy (Bernitsas et al., 2008;
Cook-Chennault et al., 2008) and some research achievements have been

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