A Study On Resistance Performance Of High-speed Planing Hull

With the continuous progress of CFD technology,the numerical simulation method has become more mature and reliable in the study of the hydrodynamic performance of hull,and the numerical simulation method has become an important method in the field of hull design and performance analysis.Compared with the traditional model experiment method,the numerical simulation method has obvious advantages: convenience,flexibility,high economy and can improve the design efficiency.The combination of numerical simulation method and traditional model experiment can greatly improve the efficiency of ship design.The research object of this paper is a deep v-type high-speed planing hull.Because of its higher speed and excellent maneuverability,it is widely used in the fields of investigation and maritime search and rescue.According to the characteristics of the high-speed planing hull,the numerical simulation of its design load condition is carried out at first,the obtained data such as resistance value and camber angle are compared and analyzed with the numerical value of the model experiment,and the grid independence is demonstrated,which proves the reliability of the method.Based on CFD numerical simulation,the whole research process is mainly carried out in three steps.First,under the design load,the resistance performance in different speed is studied.Secondly,the longitudinal position and displacement of the center of gravity are changed to study the influence of these two conditions on the resistance.Finally,the tail wave plate is installed to study the influence of the press angle on the resistance.This thesis use the CFD software STAR-CCM+ and VOF method to solve the free surface,ang use k-(?) turbulent model to solve the RANS equations.The six-degree of freedom model is used to simulate the motion posture,and the hull is regarded as a rigid body to solve the six-degree of freedom posture equation.The method of local mesh encryption is adopted to further improve the grid quality and control the number of grids in a reasonable range,so as to improve the overall computing efficiency.The results of this paper show that it is feasible to use CFD software to simulate the speediness of planing hull and the error between the calculated result and the model experimental value is small.Under the design load,by changing the initial camber,the longitudinal position of the center of mass moved backward,resulting in a small increase in resistance,but the overall heave and trim were improved.Under the condition of increasing displacement,the resistance of unit displacement is reduced and the efficiency cost ratio is increased.The stern wave suppression plate improves the sailing posture of the planing hull,making it heave and trim less,and the stern wave suppression plate with the press angle of6° has better effect.