Abstract
While sailing, VLCC is affected by a very large resistance, and consumes a large amount of fuel. How to reduce the fuel consumption has become a hot issue of research. In navigation, VLCCs attitude has an obvious influence on resistance. Due to the complexity and irregularity of the shape of VLCCs underwater part, it is difficult to use formula to calculate and forecast how the navigation attitude influences the resistance. Seeking for a fast and accurate method to study the influence of VLCCs navigation attitude on resistance is very significance. CFD method was used in this work to find the difference of resistance when the trims were different. A full-scale 3D model of a VLCC was made, and computational domains of flow field were defined according to different trims. Hexahedral meshes of the computational domains were made and boundaries were defined. By numerical simulation with FLUENT, resistances were calculated in different trims, when the VLCC was full loaded and ballast loaded. The best trims were found when the resistances were least under different loading conditions. It is the best navigation attitude to save fuel.
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