Numerical simulation of green water violent impact on a 2-D floating body is carried out using a Constrained Interpolation Profile (CIP)-based model and validated by a newly designed experiment, which is carried out in a two-dimensional wave flume in the Research Institute for Applied Mechanics, Kyushu University, Japan. In this work, focused wave are used for green water phenomena. Numerical simulations are performed by a CIP-based Cartesian grid method, which is described in the paper. Fluid-structure interaction is treated as a multi-phase flow problem. The CIP algorithm is adopted as the base scheme to obtain a robust flow solver for the multi-phase flow problem. The free surface/interface boundary is captured by THINC/SW (THINC: tangent of hyperbola for interface capturing; SW: Slope Weighting). A model of a box-shaped floating body with a small freeboard is adopted in order to easily obtain green water phenomena in the experiment. Main attentions are paid to the body responses, nonlinear phenomena, such as green water and violent impact forces. The highly nonlinear wave-body interactions, including significant body motion and water on deck, are modeled successfully in comparison with experimental measurement.

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