The Study On Design And Hydrodynamic Performance Prediction Of Trimaran Planing Boat

In recent years,trimaran planing boat is a new high-performance ship.It combines the advantages of high-speed catheters with excellent speed,high-speed catampeans and stability of hovercraft.The unique hydrodynamic performance in the military and civilian has a very broad application prospects,caused by the relevant scholars at home and abroad close attention.In this paper,the trimaran planing boat is used as the research object,and its hydrostatic performance prediction method is analyzed.Based on the improvement of the design of the trimaran planing boat,Different trimaran planing boat new boat type,and predicted its hydrodynamic performance,by comparing their resistance to rise than a resistance to the performance of relatively good trimaran planing boat new ship type.Firstly,the influence of different methods of free surface and near wall grids on the calculation results in the computational domain is studied.In this paper,the influence of six different free liquid surface meshes on the calculation results is studied in the study of the influence of the free surface meshing method on the calculation results.By comparing with the experimental values,the free surface meshing method.As well as in the free liquid surface position of the boat in the longitudinal,horizontal,vertical encryption size.In order to obtain the more suitable y+ value in the study of the influence of the near-wall meshing method on the calculation results,we further study the influence of y+ equal to 50,100,150,200,250,The effect of the six sets of grid on the calculation results is obtained.Compared with the experimental values,the applicable near-wall meshing method is obtained,and the y+ value with high accuracy is obtained.At the same time,the paper also analyzes the distribution of free surface and the pressure distribution at the bottom of the ship.Secondly,the paper studies the prediction method of the hydrodynamic performance of the M-type trimaran planing boat in the wave with the experimental conditions and the experimental data.In this paper,the first-order wave-making module in STAR-CCM+ software is used to realize the numerical wavemaking,and the comparison between the waveform value obtained by numerical simulation and the theoretical value is verified.The applicability of the wave-making module is verified,and the numerical simulation of the wave test condition of the M-type trimaran planing boat is carried out.The comparison between the experimental results and the experimental results shows that the method can simulate the resistance,The results of the amidships are consistent with the experimental results,and the values are basically the same.Thirdly,the paper improves the design of the M-type trimaran planing boat,and predicts the hydrodynamic performance of the improved boat.In the improved design of the M-type trimaran planing boat,the paper draws on the contours of an excellent single-decker and combines it into the design of the middle-hull body of the M-type trimaran planing boat.Then,based on the above numerical forecast method,the hydrodynamic performance of the improved hydrostatic performance and the hydrodynamic performance of the motion in the wave are predicted and compared with the original boat.The results show that the hydrostatic direct resistance and the ship speed has been greatly improved,the waves in the improved ship speed attitude and amidships acceleration change is not obvious,but the resistance in the waves have improved significantly.Finally,the paper improves the design of the two sides of the M-type trimaran planing boat,and designs two new-type boats with three trimaran planing boat,and predicts the two new boats.The hydrodynamic performance of the M-type trimaran planing boat(the test model),the improved type of the M-type trimaran planing boat and the two trimaran planing boat are further compared.The results show that the resistance of the trimaran planing boat can be reduced by 29.36% compared with that of the M-type trimaran planing boat,and the resistance optimization effect is remarkable.