Numerical and experimental study on a 2-D floating body under extreme wave conditions

This paper presents further developments of a constrained interpolation profile (CIP)-based Cartesian grid method [29] to model nonlinear interactions between extreme waves and a floating body, which is validated against to a newly performed experiment. In the experiment, three kinds of waves (regular wave, focused wave and combined regular and focused wave) are generated and a box-shaped floating body with a superstructure is used. Validation computations on the experiment are performed by the improved CIP-based Cartesian grid method, in which the THINC/WLIC scheme (THINC: tangent of hyperbola for interface capturing; WLIC: weighed line interface calculation), is used for interface capturing. The highly nonlinear wave–body interactions, including large amplitude body motions and water-on-deck are numerically investigated through implementation of focused wave input to the CIP-based method. Computations are compared with experimental results and good agreement is achieved. The effects of the water-on-deck phenomena and different input focus positions on the body response are also dealt with in the research.

► We study nonlinear interactions between extreme waves and a floating body numerically and experimentally. ► Validation computations on the experiment are performed by an improved CIP-based Cartesian grid method. ► We pay attention to the highly nonlinear wave–body interactions, including large amplitude body motions and water-on-deck. ► Our CIP based Cartesian grid method is suitable for investigating the extreme wave-induced responses of a floating body.