Wave energy evolution and vortex dynamics induced by gap resonance between multiple floating rectangular structures

doi:10.1063/5.0252164

2025-01-27

PRE

Domenico D. Meringolo

DOI：10.1063/5.0252164

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摘要

En 中文

This study presents an experimental design and implementation aimed at investigating the processes of wave energy evolution and vortex generation and shedding under wave-induced gap resonance between multiple floating rectangular structures (MFRSs). A synchronized particle image velocimetry system, combined with an efficient data processing method, is adopted to study the wave energy evolution from the initial to the quasi-steady state. The validity of experiment was confirmed by published experimental and numerical data, regarding variations of resonant wave height vs dimensionless incident wave numbers and free surface elevations. The intrinsic nature of two distinct gap resonant frequencies was clarified through comprehensive analyses of the flow field and phase difference of the free surface elevation. The resonant characteristics, total wave energy dissipation, and the contributions of viscous dissipation from wall friction and flow separation around two gaps of MFRSs were estimated quantitatively. The Omega-criterion vortex identification method was selected to investigate vortex generation, shedding, and dissipation modes of MFRSs. The results indicate that the second resonant frequency in gap 1 is primarily induced by fluid motion oscillations in gap 2. A substantial portion of the incident wave energy, approximately 55.4%, is dissipated under gap resonance. The diameter of vortex structures at the fundamental resonant wave frequency in gap 1 is at least three times larger than that at the second resonant wave frequency. The energy accumulated by the water blockage effect of vortex structures significantly exceeds the energy dissipated by the increased vortex generation and shedding under wave-induced gap resonance.

Keyword:

TURBULENCE

BODIES

PISTON

WATER

BEHAVIOR