The presence of water inside compartments (inside water) changes the attitude of a ship, its stability and motion characteristics. Roll motion experiments with inside water in a model in beam seas had been conducted and found that the motion characteristics were different from that of the model without inside water. In this paper, a method to simulate the roll motion of ships with inside water is described. Roll motion simulation is done for a ship, with and without water inside a deck compartment. The results of simulation are compared with the roll motion traces of similar model experiments.


Damage survivability criteria, both in the deterministic (So192, 1992) and probabilistic (A.265 & MSC.19 (58)) rules, are based on the static stability curves of ships, for the condition after damage and equalization. These rules does not take into account the sea state or the changes in the stability and motion of ships, due to the presence of trapped water in (damaged) compartments. To study the effect of damage and flooding on the damping and motion of ships in waves, motion measurements were done on models with water in damaged compartments and with and without water in undamaged compartments (Roby Kambisseri, Tetsuya Hamano and Yoshiho Ikeda (1997)). It is found that (1) Peak roll motion with inside water is less than that for the initial draft (without water), (2) Water in upper-compartments have greater effect on the roll motion damping than lower-compartment flooding, (3) The quasi-static heel during motion is observed in many cases of upper-compartment flooding and in some cases it keeps on shifting with each roll and (4) Although the peak roll motion at resonance with inside water is not more than the peak roll motion without water, it cannot be said that

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