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Lookup NU author(s): Hao Chen
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2025 The Author(s)This paper presents a numerical analysis of gap resonance driven by linear and nonlinear excitation in random waves. A numerical wave tank in the open-source toolbox OpenFOAM is set up to analyse the gap resonance between two identical fixed barges under unidirectional irregular wave conditions. The model solves the Reynolds-averaged Navier-Stokes (RANS) equations with the free surface tracked by the Volume of Fluid (VoF) scheme. Both linear and nonlinear gap resonances are considered in the present paper. The linear gap resonance is characterised by the close alignment of the peak frequency of the incident waves with the natural frequency of the gap resonance. The spectrum of the trapped waves in the gap exhibits a single-peak structure with a significantly enhanced peak. The response is predominantly linear and shows weak dependence on the steepness of the incident waves. However, the nonlinear gap resonance is excited through the nonlinear wave-wave interaction process, and energy is transferred to higher harmonics, which excite the gap resonance. The spectrum of the trapped wave evolves from a single-peak to a double-peak structure, and the second-order harmonic appears to be as important as the linear harmonic, with the third-order harmonics and above remaining negligible.
Author(s): Cao D, Zeng H, He J, Liang H, Lin Z, Wang X, Chen H
Publication type: Article
Publication status: Published
Journal: Ocean Engineering
Year: 2025
Volume: 340
Issue: Part 3
Online publication date: 10/08/2025
Acceptance date: 24/07/2025
Date deposited: 18/08/2025
ISSN (electronic): 0029-8018
Publisher: Elsevier Ltd
URL: https://doi.org/10.1016/j.oceaneng.2025.122301
DOI: 10.1016/j.oceaneng.2025.122301
Data Access Statement: The data supporting this study’s findings are available from the corresponding author upon reasonable re
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