LMA - Laboratoire de Mécanique et d’Acoustique

M. Peter - Graded arrays for spatial frequency separation and amplification of water waves

Amphithéâtre François Canac, LMA

Le 12 octobre 2021 de 11h00 à 12h00

Malte Peter / Pr. Augsburg University ; Institute of Mathematics

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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