Numerical study of effects of gap and incident wave steepness on water resonance between two rectangular barges

• Published in: European journal of mechanics, B, Fluids Vol. 86; pp. 157 - 168
• Main Authors: Li, Yajie, Wang, Xikun
• Format: Journal Article
• Language: English
• Published: Elsevier Masson SAS 01.03.2021
• Subjects: Boundary element method; Gap resonance; Incident wave steepness; Resonance frequencies; Gap resonance; Incident wave steepness; Boundary element method; Resonance frequencies
• ISSN: 0997-7546; 1873-7390
• DOI: 10.1016/j.euromechflu.2020.12.001

A 2D numerical wave tank based on the fully nonlinear potential flow theory is built to simulate the water resonance between two fixed rectangular barges, focusing on the influence of the gap width and incident wave steepness on the liquid motion and hydrodynamic forces on the surrounding bodies. The initial boundary value problem (IBVP) for disturbed velocity potential is solved through boundary element method (BEM) in the time domain. Some special treatments, such as remeshing, smoothing, and jet and plunging wave cutting, are applied to the free surface to suppress the numerical instability. With reference to the gap size, it is found that piston mode is predominant in the case of narrow gap, while higher sloshing modes dominate in the case of wide gap. With the increase in incident wave steepness and hence the associated surface nonlinear effect, the normalised liquid motion in the gap varies slightly when the piston mode dominates, while at higher-order sloshing modes it drops dramatically at or near resonance. •A 2D numerical wave tank built based on fully nonlinear potential flow theory.•Solver — boundary element method together with a time stepping scheme.•Focusing on water resonance between twin floating barges.•Effects of gap width and incident wave steepness on wave elevation and wave loads.•Piston- and sloshing-mode wave motions in narrow gap and wide gap, respectively.