ABSTRACT
The rogue wave is one sort of raging and unforeseen surface wave with enormous energy and exceptional wave height, which might have a devastating impact on the floating structure. In this paper, a new theory of rogue wave based on second-order wave theory is integrated with the wave library of waves2Foam. A series of numerical simulations of wavestructure interaction of a moored floating breakwater under the rogue wave has proceeded. Duration curves of dynamic response, wave loads, and images of flow fields are obtained through numerical simulations. The effect of focused point, wavelength, motion under the different layout of mooring systems are gained. The results reveal that the motion of floating breakwater under the rogue wave exhibits different characteristics compared with those under the regular and irregular waves.
With the booming development of international trade, the large-scale vessel, such as ultra-large container ships, has become increasingly prevailing in freight transport. Therefore, the requirement for the depth of ports is also much higher compared with the past. After the full development of natural harbour, the construction of ports has started to concentrate on open sea areas directly exposed to severe environment. As a critical component of the offshore structure in port, the breakwater is capable of mitigating the energy of waves and alleviate the accumulation of sediment. Due to its burdensome foundation, the traditional breakwater is not suitable for deepwater ports. Hence, people start to seek new forms of the breakwater. The floating breakwater is a dominant structural form in deep water owing to its handiness and low cost. When operating in deep water, the floating breakwaters may suffer from severe environmental conditions such as rogue waves. Usually, the rogue wave always has a relatively large amplitude and consist of enormous energy, which may provoke a devastating impact on floating structures. Hence, the investigation of hydrodynamic loads on floating breakwater is of considerable significance to improve its design.
Unfortunately, the interaction between rogue waves and the floating breakwaters is such a sophisticated phenomenon which is difficult to be illuminated by an analytical method, while the experimental investigation is costly. In this case, numerical simulation is a reasonable choice for probing into this problem.
