Study of Submarine Seakeeping Performance at Free Surface Condition in Regular Waves

초록

Submarines spend most of their time below the water surface, so the design is optimized for submerged condition. However, a performance in free surface condition is also important because submarines face various scenarios and the free surface condition is unavoidable for port departure and arrival. Generally, a potential flow theory is used for seakeeping analysis of a surface ship, and it is known for excellent numerical accuracy. In case of a submarine, the accuracy of potential flow theory is high at underwater, but it is low at free surface condition because of the non-linearity near the free surface area. In this study, seakeeping performance of Canadian Victoria Class submarine in regular waves was investigated to improve the numerical accuracy at free surface condition by using Computational Fluid Dynamics (CFD) and the results were compared to those of the model tests. In addition, Hydrostar, the potential theory software developed by Bureau Veritas is also used for seakeeping performance to compare with CFD results. From the calculation results, it is found that the seakeeping analysis by using CFD give good results compared with those of potential theory. In conclusion, the seakeeping analysis based on the CFD can be good solution for estimating the seakeeping performance of submarines at free surface condition.