Study Of Wave-making Resistance Of Submerged Body Near Surface In Time-domain

The curvilinear motion near the surface is one of the most important working conditions that submarine must consider.Compared with deep water cases,the near-surface submerged body is more subject to the wave-making resistance,and the hydrodynamic performance of the submarine is also greatly affected.Therefore,the study of wave-making resistance of the near-surface submerged body is of great significance.In this paper,the fast multipole method(FMM)is used to improve the traditional panel method.The derived fast multipole panel method(FMPM)can solve large-scale potential flow problems efficiently and precisely.The hydrodynamic coefficient in time-domain is obtained by stepping method,and the accuracy is therefore verified.Through numerical simulation,the wave-making resistance and lift force of the submerged body in periodic curvilinear motion are obtained.By calculating different examples,the influences of the moving depth,velocity and trajectory parameters of the submerged body is investigated.Furthermore,models of different shapes are built to understand the influence of rotating body or non-rotating body on hydrodynamic parameters.Finally,based on the working condition of U-turning submerged body,the impact of parameters such as depth,velocity on submerged body in large angle yawing are studied,the wave height diagram on the surface is captured and analyzed.By comparing the wave-making resistance and wave function,the mechanism of wave resistance for near-surface submerged body in curvilinear motion is studied and explained.