Graded arrays for spatial frequency separation and amplification of water waves

Speaker(s) Malte Peter Universität Augsburg
Date 22 May 2023 – 14:25 to 15:10
Venue INI Seminar Room 1
Session Title Graded arrays for spatial frequency separation and amplification of water waves
Event [MWSW04] Multiple scattering in engineering and applied sciences
Abstract

Wave-energy converters extracting energy from ocean waves are known to suffer from poor efficiency. We propose structures capable of substantially amplifying water waves over a broad range of frequencies at selected locations, with the idea of enhanced energy extraction. The structures consist of full or C-shaped bottom-mounted cylinders arranged in one-dimensional or two-dimensional arrays, with the cylinder properties or the array spacing graded along the array. Using linear potential-flow theory, it is shown that the energy carried by a plane incident wave is amplified within specified locations, for wavelengths comparable to the array length, and for a range of incident directions. Transfer-matrix analysis is used to analyse the large amplifications and we also show results from recent wave-flume experiments confirming the amplification phenomenon in pratice.

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