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Ocean Engineering

VIVACE (Vortex Induced Vibration Aquatic Clean Energy): A New Concept in Generation of Clean and Renewable Energy From Fluid Flow

[+] Author and Article Information
Michael M. Bernitsas, Kamaldev Raghavan, Y. Ben-Simon, E. M. Garcia

Department of Naval Architecture and Marine Engineering, University of Michigan, 2600 Draper, Ann Arbor, MI 48109-2145

J. Offshore Mech. Arct. Eng 130(4), 041101 (Sep 16, 2008) (15 pages) doi:10.1115/1.2957913 History: Received January 30, 2007; Revised July 10, 2007; Published September 16, 2008

Any device aiming to harness the abundant clean and renewable energy from ocean and other water resources must have high energy density, be unobtrusive, have low maintenance, be robust, meet life cycle cost targets, and have a 1020year life. The vortex induced vibration aquatic clean energy (VIVACE) converter—invented by Bernitsas and Raghavan, patent pending through the University of Michigan—satisfies those criteria. It converts ocean/river current hydrokinetic energy to a usable form of energy such as electricity using VIV successfully and efficiently for the first time. VIVACE is based on the idea of maximizing rather than spoiling vortex shedding and exploiting rather than suppressing VIV. It introduces optimal damping for energy conversion while maintaining VIV over a broad range of vortex shedding synchronization. VIV occurs over very broad ranges of Reynolds (Re) number. Only three transition regions suppress VIV. Thus, even from currents as slow as 0.25ms, VIVACE can extract energy with high power conversion ratio making ocean/river current energy a more accessible and economically viable resource. In this paper, the underlying concepts of the VIVACE converter are discussed. The designs of the physical model and laboratory prototype are presented. A mathematical model is developed, and design particulars for a wide range of application scales are calculated. Experimental measurements on the laboratory prototype are reported in the sequel paper and used here for preliminary benchmarking.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Lower branch frequency response for different mass ratios versus varying U*; reproduced from Ref. 14 here f*=fcyl*

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Figure 2

Amplitude of oscillation Feng’s (29) for experiments in air by Feng and experiments in water by Khalak and Williamson (19)

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Figure 3

Simple schematic of a VIVACE module with coordinate system

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Figure 4

Small VIVACE converter power plant

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Figure 5

Geometry, dimensions, and arrangement of cylinders in a VIVACE converter assembly

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Figure 6

VIVACE model in the low-turbulence Free Surface Water Channel of the University of Michigan

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Figure 7

Uninterrupted nonlinear resonance with no dead zones

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Figure 8

Displacement versus Time for VIVACE Model I at U=0.8m∕s, D=0.127m, for Re=0.892×105

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Figure 9

Cost comparison between conventional and alternative sources of energy and the VIVACE converter (46).

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Figure 10

Volume energy density

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Figure 11

Footprint volume energy density

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Figure 12

Weight energy density

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