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A second-order theory for an array of curved wave energy converters in open sea

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posted on 24.05.2019, 10:03 authored by Simone Michele, Emiliano RenziEmiliano Renzi
We present a second-order nonlinear theory for an array of curved flap-type wave energy converters (WECs) in open sea, excited by oblique incident waves. The flap model, when at rest, has a weak displacement of its wetted surface about the vertical plane. Using a perturbation-harmonic expansion technique, we decompose the set of nonlinear governing equations in a sequence of linearised boundary-value problems that can be investigated through analytical methods. The velocity potential at the leading order is solved in terms of elliptical coordinates and related Mathieu functions. Due to quadratic interactions of the first-order potential, a drift flow, a static angular displacement and a bound wave appear at the second order. At the same order the effect of the flap shape forces the first harmonic solution. We then compare an array of flat devices with an array of curved flaps, assuming several shape functions that could be of practical engineering interest. We show that hydrodynamic interactions between the curved flaps and incident waves can have constructive effects in terms of power absorption at large frequencies.

Funding

This work was supported by a Royal Society - CNR International Fellowship (Grant NF170771).

History

School

  • Science

Department

  • Mathematical Sciences

Published in

Journal of Fluids and Structures

Volume

88

Pages

315 - 330

Citation

MICHELE, S. and RENZI, E., 2019. A second-order theory for an array of curved wave energy converters in open sea. Journal of Fluids and Structures, 88, pp.315-330.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Journal of Fluids and Structures and the definitive published version is available at https://doi.org/10.1016/j.jfluidstructs.2019.05.007.

Acceptance date

16/05/2019

Publication date

2019-06-10

Copyright date

2019

ISSN

1095-8622

Language

en