Fluid-Solid Coupling Analysis And Optimization Design Of Tank Equipment

Tank-type liquid-carrying equipment is commonly used to transport high-risk liquids.During transportation,the liquid sloshing of the internal liquid will change the center of mass,which will affect the structural stability.In extreme conditions,when the tank collides with the structure,it may cause damage to the tank body,cause leakage of dangerous liquid,and bring hidden safety risks.Therefore,analyzing the fluid-solid coupling problems related to tank-type liquid carrier equipment and optimizing the design of the internal anti-sloshing structure are of great significance for improving the transportation safety of tank-type liquid carrier equipment.Liquid sloshing and external shocks in tank-type liquid-carrying equipment involve violent liquid-solid coupling.In order to analyze the strong nonlinear liquid sloshing behavior inside the container,an improved smooth particle dynamics(SPH)method was used to accurately track the severely deformed or even broken free liquid surface,which can predict the pressure response of the container wall accurately.In order to predict the destruction behavior of liquid-carrying equipment during impact,the coupled Euler's Langerian method was used to simulate and analyze the geometric,material and contact nonlinear problems of the tank structure during collision,and a suitable design structure was found to improve anti-collision ability of the tank.The main research contents are as follows:(1)A liquid sloshing model of a two-dimensional rectangular container was constructed,and the liquid sloshing phenomenon in the container under horizontal cosine excitation was simulated.The calculation results were compared with the experimental results,which is in good agreement,and indicate that the SPH method is suitable for researching liquid sloshing problems;The influence of excitation frequency was also studied,and the amplitude,liquid carrier rate,impact pressure and centroid of liquid sloshing were researched.(2)According to the characteristics of liquid sloshing,the tank structure was improved.The liquid sloshing in the tank with circular cross section,elliptical cross section and improved trapezoidal cross section was studied.The changes of free liquid surface,centroid and overturning moment were analyzed.After adding baffles with different heights and different numbers,the affects of free liquid surface,center of mass and overturning moment were analyzed.(3)Under collision conditions,the dynamic response of the tank was analyzed.and the affects from impact speed of the tank,the liquid loading rate of the tank,the impact attitude and the wall thickness of the tank were explored,According to the simulation results,structural design measures to improve the collision resistance of the tank were proposed.