The interaction between extreme wave and a surface-piercing vertical cylinder is investigated numerically based on our recent naoe-Foam- SJTU solver, which is developed under the framework of the OpenFOAM, an open source code library writing with fully objectoriented C++ language. The governing equations are discretized by using the finite volume method. Two fluids are considered and the volume of fluids (VOF) technique is employed to capture water-air interface. The transient extreme water wave is generated by directional wave focusing just with two different regular waves. The model is validated by compare the extreme wave profile with the corresponding experimental data. Then the simulation of extreme wave-cylinder interactions is carried out. Extreme wave impact loading on the cylinder and wave run-up problems are studied and the results are analyzed and discussed. The presented results show the details of extreme wave effect on the cylinder. The present numerical method is validated to be efficiency for solving the problem of wave-structure interaction with large deformation of the free-surface.
With the development of marine and offshore engineering, more and more offshore structures are being or will be constructed. Offshore structures may suffer serious damage due to rough sea climate especially when the extreme waves occur. Therefore, to ensure the stability and survivability of an offshore structure, it is of great importance to develop a reliable prediction method for investigating the extreme wave effects on offshore structures. Extreme wave, also called freak wave, rogue wave, is a giant wave and may occur in both deep and narrow water. Extreme wave has attracted great attention both in offshore engineering and academic research. Many efforts have been made to learn on the physical mechanisms of freak wave generation. In the experiments, the extreme waves are generated by the wave-maker.