Abstract
A two-dimensional boundary element method (BEM) based on the fully nonlinear potential flow theory is adopted to study second-order wave resonance in a gap formed by twin barges. Second-order resonance is related to second-order effects of wave elevations and hydrodynamic forces, which have components of the sum or difference frequency. Firstly, forced body motions (heave, sway, and roll mode) excited second-order resonance is studied with regard to different gap width and resonant mode. Then incident wave induced second-order resonance in the gap is simulated. It is found that second-order resonance is more easily provoked and significant when the gap width over draught ratio is large.
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