Helmholtz-type resonator with increased tunability and reduced viscous loss with application to wave energy converters

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dc.contributor.authorCui, L.
dc.contributor.authorSpinks, N.
dc.contributor.authorSergiienko, N.Y.
dc.contributor.authorTothova, D.
dc.contributor.authorLeontini, J.S.
dc.contributor.authorCazzolato, B.S.
dc.contributor.authorManasseh, R.
dc.date.issued2025
dc.description.abstractWave-energy converters such as Oscillating Water Columns (OWCs) are designed to resonate at ocean-wave frequencies to extract renewable energy, but the low frequencies of the energetic waves demand large, expensive devices. To resolve this predicament, smaller-sized Helmholtz OWCs (H-OWCs) were designed. Their small sizes are achieved by reducing the cross-sectional area of their entrance sections. However, this leads to viscous losses at the transition between an H-OWC’s entrance and main sections. Moreover, an H-OWC is difficult to tune due to its fixed geometry. This paper proposes a modified H-OWC, called an I-OWC. Its main innovation is to use an “insert” placed in a chamber to reduce the cross-sectional area of the entrance section, avoiding the transition in an H-OWC to reduce vortex damping. Another benefit of the I-OWC is an increased tunability via changing the length of the insert in the chamber. A model of I-OWC is designed semi-analytically; the method is validated by wave flume tests. A conceptual design of a full-scale I-OWC is then proposed. In a broader sense, the design provides an alternative approach to tuning the frequency of a general Helmholtz-type resonating cavity.
dc.description.statementofresponsibilityLidong Cui, Nathan Spinks, Nataliia Y. Sergiienko, Danica Tothova, Justin S. Leontini, Benjamin S. Cazzolato, Richard Manasseh
dc.identifier.citationOcean Engineering, 2025; 333:121432-1-121432-11
dc.identifier.doi10.1016/j.oceaneng.2025.121432
dc.identifier.issn0029-8018
dc.identifier.issn1873-5258
dc.identifier.orcidSergiienko, N.Y. [0000-0002-3418-398X]
dc.identifier.orcidCazzolato, B.S. [0000-0003-2308-799X]
dc.identifier.urihttps://hdl.handle.net/2440/147696
dc.language.isoen
dc.publisherElsevier
dc.relation.granthttp://purl.org/au-research/grants/arc/LP180101109
dc.relation.granthttp://purl.org/au-research/grants/arc/IE230100545
dc.rights© 2025 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
dc.source.urihttps://doi.org/10.1016/j.oceaneng.2025.121432
dc.subjectHelmholtz resonator; Wave energy converter; Oscillating water column; Potential flow theory
dc.titleHelmholtz-type resonator with increased tunability and reduced viscous loss with application to wave energy converters
dc.typeJournal article
pubs.publication-statusPublished

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