Wave energy absorption by a floating air bag

A. Kurniawan, J. R. Chaplin, D. M. Greaves, M. Hann

Research output: Contribution to journalArticle

13 Citations (Scopus)
1 Downloads (Pure)


A floating air bag, ballasted in water, expands and contracts as it heaves under wave action. Connecting the bag to a secondary volume via a turbine transforms the bag into a device capable of generating useful energy from the waves. Small-scale measurements of the device reveal some interesting properties, which are successfully predicted numerically. Owing to its compressibility, the device can have a heave resonance period longer than that of a rigid device of the same shape and size, without any phase control. Furthermore, varying the amount of air in the bag is found to change its shape and hence its dynamic response, while varying the turbine damping or the air volume ratio changes the dynamic response without changing the shape.

Original languageEnglish
Pages (from-to)294-320
Number of pages27
JournalJournal of Fluid Mechanics
Publication statusPublished - 10 Feb 2017
Externally publishedYes

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