| Ocean resources are extremely rich.If mankind wants to survive,multiply and develop for a long time on the earth,it must fully tap more ocean resources.Knowing the ocean and developing the ocean require technical means,and underwater vehicle technology is one of them.The rapidity,maneuverability,and seakeeping of underwater vehicles have an important impact on their exploration of the ocean,monitoring of water quality,and military strategies.Therefore,it is very important to systematically study the speed,maneuverability,and seakeeping of underwater vehicles.They determine the overall hydrodynamic performance of underwater vehicles.With the development of numerical calculation methods and computer technology,the use of fluid mechanics(CFD)to study the hydrodynamic performance of underwater vehicles has become an important method.However,the use of this method involves grid discretization,model selection,who have significant influence on the calculation results.Therefore,in the rapid research,the effects of calculation area,grid size,turbulence model,and boundary layer grid size are mainly focused on the analysis of static water resistance characteristics,open water characteristics of propellers,and direct navigation and selfpropulsion characteristics.In the study of maneuverability,the influence of mesh size,turbulence model,and boundary layer mesh size on the calculation of maneuverability hydrodynamic coefficients is explored;the mesh and time step uncertainties are made for rotational motion and Z-shape manipulation Degree analysis.In the research of seakeeping,the influence of grid discrete size and frequency selection on the motion response of the vehicle is mainly explored.Finally,based on the method of maximizing dispersion,a comprehensive evaluation model of hydrodynamic performance considering rapidity,maneuverability,and seakeeping indicators is constructed.This paper forms a set of CFD methods that can be used to predict the speed,maneuverability,and seakeeping of underwater vehicles,and builds a comprehensive hydrodynamic performance evaluation model.The research results can provide technical support for the performance comparison of underwater vehicles under multiple schemes and optimization... |
