Application Research On Fluid Sloshing Simulation Of Oil Tank Truck Based On SPH

On the basis of fully understanding the current domestic and international development status and relevant policy support and technical requirements of the oil tank truck transportation industry in the field of transportation,this paper realizes the simulation calculation of rectangular tank sloshing in two-dimensional plane and three-dimensional space by using the smooth particle hydrodynamics(SPH)numerical calculation method,and compares it with the reference experiments of domestic research teams,The feasibility and accuracy of the SPH method in three-dimensional fluid simulation calculation in this paper are verified.The fluid sloshing model of cylindrical oil tank is established according to the external and internal structure of the oil tank of the actual oil tank truck.The flow law and change mechanism of fluid particles are simulated and calculated in two-dimensional plane and three-dimensional space.In order to improve the stability and safety of the tank truck,an optimization scheme of oil tank structure is proposed,a variety of liquid filling conditions are set to analyze the particle characteristics of fluid sloshing,which is of great significance in the theoretical research and Engineering Application Research of oil tank truck transportation industry.The main content of this paper is as follows:The application background and research significance of fluid sloshing simulation of oil tank truck are introduced.Under the background of the new era of rapid economic development,the state has successively issued a number of policies to encourage the development of oil tank truck transportation industry.At the same time,it introduces the harm caused by tank truck in the event of dangerous accidents,gives a detailed overview of the concept of fluid sloshing,describes the conditions when fluid sloshing occurs,and expounds the theoretical methods,experimental methods and numerical simulation methods for solving the problem of fluid sloshing,The research status of fluid sloshing by scholars and researchers at home and abroad in recent 15 years is summarized.Based on the dynamic theory of solving fluid problems,this paper summarizes computational fluid dynamics,and focuses on the numerical calculation method of fluid sloshing.In the traditional grid calculation method,grid winding,grid distortion and other problems will occur when calculating and dealing with the large-area deformation of fluid,while the meshless calculation method can effectively deal with the large-area deformation of fluid(such as fluid splashing,breaking and overturning).On this basis,the basic idea of the new generation meshless particle method smooth particle dynamics method and the relevant calculation values of analyzing and solving the problem are introduced in detail.The Lagrangian Navier Stokes equation is analyzed and introduced.The SPH expressions of Navier Stokes density equation,momentum equation and energy equation are derived by using the method in SPH.The problem of solving the fluid sloshing of rectangular tank in two-dimensional state based on SPH method is studied.According to the reference actual experimental device,the two-dimensional tank sloshing model under different liquid filling ratio is established,and the model is granulated.Through the calculation and simulation results,the change process of fluid with time during tank sloshing is analyzed and compared with the simulation calculation method in reference,the accuracy and feasibility of SPH method in two-dimensional state are verified by comparison.Three nearest neighbor particle search methods in SPH method are introduced.For the initial time configuration of particles,the particle distribution should be as uniform as possible,and the numerical results are more accurate when the parameters of particles change continuously.The fluid sloshing of rectangular tank in three-dimensional space is simulated and calculated based on SPH method.Compared with the reference experimental records and two-dimensional simulation calculation results,the calculation results in three-dimensional space are more intuitive,accurate and reliable,and more in line with the engineering practical application in fluid sloshing.The application of SPH method is further extended,and the simulation calculation of vehicle wading in three-dimensional space is carried out and the actual wading is referenced.The feasibility of the application of SPH method in three-dimensional space is demonstrated,which provides a certain theoretical reference for the subsequent application research of simulation calculation of tank car fluid sloshiness in three-dimensional space.Combined with the actual external and internal structure of the oil tank,the cylindrical oil tank model is established based on the modeling software,the initial velocity excitation of the fluid is given,and the flow law and change mechanism of particles during fluid sloshing are calculated and analyzed.In order to ensure the safety and stability of tank car operation,combined with the research literature on fluid sloshing direction at home and abroad,an oil tank structure optimization scheme is proposed,the optimized model is established,and the two-dimensional and three-dimensional simulation calculation is carried out based on SPH method.Through the analysis of the change process of fluid with time and the characteristics of fluid particles,in the process of fluid sloshing,the sloshing time of the oil tank with longitudinal wave plate structure is significantly lower than that of the oil tank without longitudinal wave plate structure.The oil tank with longitudinal wave plate structure can stabilize in a short time when the fluid is excited by the outside world,which can effectively improve the safety and stability of the tank truck during operation.According to the analysis of the characteristics of fluid particles,the structure can effectively lower the kinetic energy of the system,and effectively reduce particles attacking the tank wall,so as to reduce the fatigue damage of the tank and improve the service life of the tank.