Coupled Hydrodynamic And Aerodynamic Analysis Of Seaplane Take-off And Landing Process In Calm Water

The takeoff process and landing on water process of the seaplane is complex,the state is changeable,and the influence factors are numerous.For simulation analysis for the seaplane on takeoff process and landing,a multi-phase URANS method is used to analysis the performance of seaplane during the process of hydrostatic take-off and landing.And a new numerical simulation method is put forward.By considering the coupling effect between aerodynamic and hydrodynamic forces,the effect of lift and buoyancy on the height change of the waterline,as well as the influence of the resistance and the thrust of the engine on the forward speed of the model in the process,simulating the takeoff and landing process of the seaplane,and analyzing the stress and related waterline height in the process.First,the aerodynamic calculation is simulated by F6 model and compared with 2nd DPW meeting in experimental results,the aerodynamic numerical calculation method is verified,and the hydrodynamic calculation is simulated through Wigley model and compared with 17 th conference ITTC resistance experiment results.The free surface interface is captured by the VOF method in the process of simulation of to,hydrodynamic numerical method are verified.Then,the normal ballasting conditions and heavy ballasting conditions of the seaplane in take-off process are numerically simulated,and the changing tendency of various forces during the take-off is obtained.The calculation results are verified by the empirical formula theory in the field of shipbuilding.Then,the results are compared with the experimental results and former paper results.The calculation results show that the change of take-off resistance and the change of related waterline height are related to the initial ballasting conditions of seaplane.The total resistance of seaplane during take-off under normal ballasting conditions is slowly increasing,and the phenomenon of embedding will not occur in the early stage of take-off.However,the total resistance first increases and then decreases under heavy ballast condition,and the embedding phenomenon will occur in the early stage of take-off.Finally,the numerical simulation of the landing on water process of the seaplane is carried out.In order to compare with the result of the take-off process,the seaplane with normal ballast condition is selected for water simulation,and the changing trend of various forces in the process of water landing is obtained.The empirical formula has verified the calculation result,the lift decreases continuously with the decrease of Fr.Different from the change of resistance during take-off under normal ballast conditions,the resistance of the process of take-off process first increases and then decreases.The related waterline height of the seaplane gradually decreases and the speed of descent is fast first and slow later.