Wave resonance within a narrow gap between twin rectangular boxes under wave-current actions

Resonant characteristics of waves in a small gap between two adjacent identical boxes of rectangle in a steady current are investigated. Two numerical models based on the viscous flow and the potential fully nonlinear theories are utilized in the study. The former uses the OpenFOAM and the latter employs a higher-order finite element method. Extensive simulations are made to analyze wave interactions with the twin-box under various current speeds, incident wave heights and gap spacings. The wave resonant phenomena have been observed through the above two numerical models, in which comparisons of wave and hydrodynamic force are made between them. The numerical results show that the current has clear influence on the wave and force at resonance in both models especially for the wave, and the incident wave height and gap spacing also has great effects on the resonant wave and force at every current speeds.