Effects of free heave motion on wave resonance inside a narrow gap between two boxes under wave actions

Fluid resonance inside a narrow gap between two side-by-side boxes is investigated based on an open-source CFD package, OpenFOAM. An upstream box heaves freely under wave actions and downstream remains fixed. The focus of this work to study the influence motion hydrodynamic behavior resonant fluid gap. considered in includes height gap, heave displacement their harmonic components, reflection, transmission energy loss coefficients. For comparison, configuration which are fixed considered. It was found that increases frequency significantly reduces frequencies at maximum minimum displacements observed obviously deviate from frequency. displacement, effects incident components different. results larger reflection coefficient smaller coefficient.