Resonant triad interactions of two acoustic modes and a gravity wave

Zuccoli, Emanuele and Kadri, Usama ORCID: https://orcid.org/0000-0002-5441-1812 2025. Resonant triad interactions of two acoustic modes and a gravity wave. Journal of Fluid Mechanics 1008 , A15. 10.1017/jfm.2025.111

Preview

PDF - Published Version Available under License Creative Commons Attribution. Download (4MB) | Preview

Abstract

The interaction between acoustic and surface gravity waves is generally neglected in classical water-wave theory due to their distinct propagation speeds. However, nonlinear dynamics can facilitate energy exchange through resonant triad interactions. This study focuses on the resonant triad interaction involving two acoustic modes and a single gravity wave in water of finite and deep depths. Using the method of multiple scales, amplitude equations are derived to describe the spatio-temporal behaviour of the system. Energy transfer efficiency is shown to depend on water depth, with reduced transfer in deeper water and enhanced interaction in shallower regimes. Numerical simulations identify parameter ranges, including resonant gravity wavenumber, initial acoustic amplitude and wave packet width, where the gravity-wave amplitude is either amplified or reduced. These results provide insights into applications such as tsunami mitigation and energy harnessing.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Mathematics
Publisher:	Cambridge University Press
ISSN:	0022-1120
Date of First Compliant Deposit:	22 January 2025
Date of Acceptance:	20 January 2025
Last Modified:	30 Apr 2025 10:49
URI:	https://orca.cardiff.ac.uk/id/eprint/175504

Actions (repository staff only)

Edit Item