Effect of Fluid in Ships Tanks on the Behavior of Double Hull VLCCs in Collision〔含討論〕

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In structural design and optimization of a double hull tanker, it is important to understand the behavior of its hull structure and energy absorption mechanism in collision and grounding accidents. It is also important to predict its hull energy absorption capacity and resulting damage in such an accident. To this purpose, numerical simulation is being increasingly used. However, due to practical reasons, i.e. model size and computer resources, ship collision simulations are carried out neglecting the fluid in cargo tanks. Fluid (liquid cargo) in cargo tanks may have an important effect on deformation configuration and failure of inner side plating. This, in turn, may affect the total energy absorbed by the struck ship until failure of inner side plating and spillage of oil. This paper reports the results of a numerical study carried out to investigate such effect of fluid in ships tanks. A structural member of a tank side structure consisting of one typical side longitudinal of a VLCC is considered together with the inner side plating adjacent to it (one longitudinal spacing, one half above and one half below the considered longitudinal). The span is taken as the distance between two successive web frames. This structure is modeled with finite shell elements. A volume of fluid representing liquid cargo adjacent to the member is modeled in an Euler mesh. Forced motion representing collision at the middle of the member is imposed. Comparisons of the behavior of the member in absence of and in presence of the fluid are carried out. The study shows that when the fluid inside a tank has enough space to move, such as in a partially filled tank, its effect on absorbed energy is small. On the hand, in a full tank, where only a small space is available for the fluid to move, normally about 2% of the tank volume, Energy absorption capacity of side structure may be drastically reduced.
社団法人日本船舶海洋工学会の論文

Effect of Fluid in Ships Tanks on the Behavior of Double Hull VLCCs in Collision〔含討論〕

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Effect of Fluid in Ships Tanks on the Behavior of Double Hull VLCCs in Collision〔含 討論〕

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Effect of Fluid in Ships Tanks on the Behavior of Double Hull VLCCs in Collision〔含討論〕