Hydrodynamics and Load Shedding Behavior of a Variable Geometry Oscillating Surge Wave Energy Converter (OSWEC)

33 Pages Posted: 7 Aug 2021

See all articles by Michael Choiniere

Michael Choiniere

University of Maine

Jacob Davis

University of Massachusetts Amherst

Nhu Nguyen

University of Massachusetts Amherst

Nathan Tom

National Renewable Energy Laboratory

Matthew Fowler

University of Maine

Krish Thiagarajan Sharman

University of Massachusetts Amherst

Abstract

In order to improve their long-term viability, wave energy converters (WEC) need to be able to shed loads when a threshold wave condition is exceeded. As shown by Tom et al. [1], provision of adjustable flaps within the body of an Oscillating Surge Wave Energy Converter (OSWEC) allows wave energy to pass through the device. A control system may then be able to open and close the flaps when waves approaching the device exceed preset thresholds. The variable geometry OSWEC concept studied in this paper is a bottom-hinged rectangular wave paddle with five flaps of elliptical cross-section embedded into the face of the paddle. System ID tests were conducted on this VG-OSWEC device at 1:14 scale in a wave basin. Free decay tests showed that the damping was distinctly nonlinear when the flaps were fully open, and the natural frequency was increased by 40% when compared with the flaps fully closed configuration.

Suggested Citation

Choiniere, Michael and Davis, Jacob and Nguyen, Nhu and Tom, Nathan and Fowler, Matthew and Sharman, Krish Thiagarajan, Hydrodynamics and Load Shedding Behavior of a Variable Geometry Oscillating Surge Wave Energy Converter (OSWEC). Available at SSRN: https://ssrn.com/abstract=3900951 or http://dx.doi.org/10.2139/ssrn.3900951

Michael Choiniere

University of Maine ( email )

Orono, ME 04469
United States

Jacob Davis

University of Massachusetts Amherst

Department of Operations and Information Managemen
Amherst, MA 01003
United States

Nhu Nguyen

University of Massachusetts Amherst

Department of Operations and Information Managemen
Amherst, MA 01003
United States

Nathan Tom

National Renewable Energy Laboratory ( email )

1617 Cole Blvd.
Golden, CO 80401-3393
United States

Matthew Fowler

University of Maine

Orono, ME 04469
United States

Krish Thiagarajan Sharman (Contact Author)

University of Massachusetts Amherst ( email )

Department of Operations and Information Managemen
Amherst, MA 01003
United States

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