The performance of an asymmetrical rolling cam as an ocean-wave energy extractor was studied experimentally and theoretically in the 70s. Previous inviscid-fluid theory indicated that energy-absorbing efficiency could approach 100% in the absence of real-fluid effects. The way viscosity alters the performance is examined in this paper for two distinctive rolling-cam shapes: a smooth “Eyeball Cam (EC)” with a simple mathematical form and a “Keeled Cam (KC)” with a single sharp-edged keel. Frequency-domain solutions in an inviscid fluid were first sought for as baseline performance metrics. As expected, without viscosity, both shapes, despite their differences, perform exceedingly well in terms of extraction efficiency. The hydrodynamic properties of the two shapes were then examined in a real fluid, using the solution methodology called the free-surface random-vortex method (FSRVM). The added inertia and radiation damping were changed, especially for the KC. With the power-take-off (PTO) damping present, nonlinear time-domain solutions were developed to predict the rolling motion, the effects of PTO damping, and the effects of the cam shapes. For the EC, the coupled motion of sway, heave and roll in waves was investigated to understand how energy extraction was affected.
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December 2015
Research-Article
Computational Modeling of Rolling Wave-Energy Converters in a Viscous Fluid1
Yichen Jiang,
Yichen Jiang
Department of Mechanical Engineering,
University of California at Berkeley,
Berkeley, CA 94720
e-mail: yichen.e.jiang@gmail.com
University of California at Berkeley,
Berkeley, CA 94720
e-mail: yichen.e.jiang@gmail.com
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Ronald W. Yeung
Ronald W. Yeung
American Bureau of Shipping Inaugural
Chair in Ocean Engineering;
Director of Computational Marine Mechanics
Laboratory (CMML),
Department of Mechanical Engineering,
University of California at Berkeley,
Berkeley, CA 94720
e-mail: rwyeung@berkeley.edu
Chair in Ocean Engineering;
Director of Computational Marine Mechanics
Laboratory (CMML),
Department of Mechanical Engineering,
University of California at Berkeley,
Berkeley, CA 94720
e-mail: rwyeung@berkeley.edu
Search for other works by this author on:
Yichen Jiang
Department of Mechanical Engineering,
University of California at Berkeley,
Berkeley, CA 94720
e-mail: yichen.e.jiang@gmail.com
University of California at Berkeley,
Berkeley, CA 94720
e-mail: yichen.e.jiang@gmail.com
Ronald W. Yeung
American Bureau of Shipping Inaugural
Chair in Ocean Engineering;
Director of Computational Marine Mechanics
Laboratory (CMML),
Department of Mechanical Engineering,
University of California at Berkeley,
Berkeley, CA 94720
e-mail: rwyeung@berkeley.edu
Chair in Ocean Engineering;
Director of Computational Marine Mechanics
Laboratory (CMML),
Department of Mechanical Engineering,
University of California at Berkeley,
Berkeley, CA 94720
e-mail: rwyeung@berkeley.edu
2Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received April 20, 2012; final manuscript received August 5, 2015; published online October 12, 2015. Assoc. Editor: Hideyuki Suzuki.
J. Offshore Mech. Arct. Eng. Dec 2015, 137(6): 061901 (9 pages)
Published Online: October 12, 2015
Article history
Received:
April 20, 2012
Revised:
August 5, 2015
Citation
Jiang, Y., and Yeung, R. W. (October 12, 2015). "Computational Modeling of Rolling Wave-Energy Converters in a Viscous Fluid." ASME. J. Offshore Mech. Arct. Eng. December 2015; 137(6): 061901. https://doi.org/10.1115/1.4031277
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