Abstract
Nonlinear interactions between water waves and a moored floating body are investigated using the virtual boundary force (VBF) method. The paper first introduces an in-house three-dimensional viscous incompressible flow model (NEWTANK), which is used to simulate wave-floating structure interaction by using the VBF method. Then the coupling procedure between the mooring line model and the floater model is described. Some validation cases of the developed model, including the motions of a free-floating box in two different water waves, are presented. The present numerical results will be compared with the available experimental data and other numerical results from the published literature. After that, the validity of the mooring line in the numerical model is simulated by simulating the motions of a floating box in still water. Finally, the verified model is applied to analyze the wave-induced motions of a catenary moored floating structure, investigating the motion responses and mooring forces responses. The numerical results agree well with the experimental measurements on the whole. This indicates that the present numerical model can correctly capture the main features of the wave-moored floating structure interaction.
Highlights
To limit the motions of a floating object in an ocean environment, mooring lines are often used
Williams et al [3] studied the hydrodynamic properties of a pair of pontoon-type floating breakwaters by the boundary integral equation method using an appropriate Green’s function
The in-house three-dimensional viscous flow model (NEWTANK) which was built by Liu and Lin [18] is mainly applied to the liquid sloshing and water wave problems in the previous studies [19,20,21]
Summary
To limit the motions of a floating object (i.e., buoy, pontoon, floating breakwater, etc.) in an ocean environment, mooring lines are often used. Xue et al [9,10] developed a three-dimensional numerical wave tank model and the corresponding physical model [11] for studying liquid sloshing dynamics and related problems In their model, a coupled virtual boundary force with the volume of the fluid method was proposed to simulate wave interaction with internal structures. Peng et al [13] studied the interactions between water waves and inclined-moored floating breakwater using a viscous flow model Their studies only focused on the submerged floating structures in two-dimensional space. The in-house three-dimensional viscous flow model (NEWTANK) which was built by Liu and Lin [18] is mainly applied to the liquid sloshing and water wave problems in the previous studies [19,20,21].
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