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Publications
Rajendran, S. and Guedes Soares, C. (2018), “Marine Vehicles and Floating Systems: Effect of slamming and green water on short term distribution of vertical bending moment of a containership in abnormal waves”, 4th International Conference in Ocean Engineering (ICOE 2018), 18-21 February, Normandy, Northern France
The prediction of wave loads acting on a ship has almost become a matured technology in the field of naval architecture. However, ship loads in abnormal waves are rarely examined, both numerically and experimentally, because of the difficulty associated with the generation of the abnormal waves embedded in real deterministic waves. In this paper, a practical engineering numerical tool is used to analyze the effect of green water on the vertical bending moment of a containership in abnormal waves. Two kinds of models are tested. First one, with an extended bulwark for which no green water is observed and the second one without the bulwark for which severe green water shipping is observed. The numerical tool is based on a 2D time domain method and the hydrostatic and hydrodynamic forces are calculated for the exact wetted surface area under the incident wave profile. The radiation forces are represented by means of convolution integrals based on Cummins formulation. The memory functions are calculated from the frequency dependent coefficients based on the analogy between the time domain and frequency domain formulations in a linear problem. The hydrodynamic coefficients are also calculated for the exact wetted surface area under the incident wave profile. The ship is tested in the well-known abnormal wave ‘New Year wave’ and ‘North Alwyn wave’ for two velocities. The numerical results are compared with the experimental results measured in the wave tank. In order to compare the time series, the measured incident wave profile is used in the numerical simulation.
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