Mr. Vishak Sivadas Profile

Vishak Sivadas

Research Assistant at George Washington Univ

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Proceedings Article | 27 April 2011 Paper

A study of several vortex-induced vibration techniques for piezoelectric wind energy harvesting

Vishak Sivadas, Adam Wickenheiser

Proceedings Volume 7977, 79770F (2011) https://doi.org/10.1117/12.878493

KEYWORDS: Wind energy, Beam shaping, Solids, Fluid dynamics, Optical simulations, Energy harvesting, Computer simulations, Interfaces, Mechanics, Focus stacking software

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This paper discusses a preliminary study on harnessing energy from piezoelectric transducers by using bluff body and vortex-induced vibration phenomena. Structures like bridges and buildings tend to deform and crack due to chaotic fluid-structure interactions. The rapid variation of pressure and velocity can be tapped and used to power structural health monitoring systems. The proposed device is a miniature, scalable wind harvesting device. The configuration consists of a bluff body with a flexible piezoelectric cantilever attached to the trailing edge. Tests are run for different characteristic dimensions or shapes for the bluff body and optimized for maximum power over a wide range of flow velocities. The main motive here is to seek a higher synchronized region of frequencies for the oscillation amplitudes. The multi-physics software package COMSOL is used to vary the design parameters to optimize the configuration and to identify the significant parameters in the design. The simulation results obtained show a wider lock-in bandwidth and higher average power for the cylindrical bluff body compared to the other two bluff body shapes investigated, the greatest average power being 0.35mW at a Reynolds number of 900, beam length of 0.04m, and bluff body diameter of 0.02m.

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