In this paper, the coupling process between oil leakage and hull motion of a stationary double hulled damaged tanker in still water is simulated. The coupling process is realized by constructing a three-dimensional full-scale numerical model of the damaged tanker, using overlapping grid technology and DFBI six degree of freedom solver. The oil-water flow law is explored by analyzing the characteristic parameters such as hull draft, inclination, oil leakage speed and oil leakage time. The influence of hull motion on oil leakage of damaged tankers and its mechanism are obtained. The research shows that the driving force of oil leakage is gravity and pressure difference for the six degree of freedom motion damaged tanker. The change of the total mass of the ship caused by the damaged tanker mainly causes the hull heave movement. In the process of floating and sinking, the hull changes the pressure of the oil and sea water on the hole, affecting the leakage speed and spillage. The greater the heave movement amplitude, the greater the pressure difference on both sides. The stronger the leakage power, the greater the leakage.
With the development of marine transportation industry, there are not only a large number of ships, but also tend to be large-scale. To some extent, it increases the chance of accidents. Although the navigation technology is constantly improving there are still many cases of ship damage accidents under many uncontrollable factors (collision, grounding, etc.). As long as the ships are in operation, they will inevitably be damaged and caused huge losses, especially for oil tankers. A large amount of oil will leak into the sea, which not only causes marine environmental pollution and economic losses, but also threatens the safety of personnel on board. At present, the research on the underwater oil leakage of double hull oil tanker is mainly based on the hydrostatics theory, without considering the coupling effect between oil leakage and hull motion. In addition, there are too many assumptions. For instance, the simulated external environment is too idealized, such as only considering hydrostatic conditions, ignores the impact of ship sloshing caused by offshore wind and waves on the oil leakage process. The model is excessively simplified, such as the damaged oil tanker is simplified to the damaged oil tank and the ship motion is simplified only considering a certain degree of freedom. So, it can ‵ t meet the requirements of oil leakage prediction accuracy of damaged tankers.
