Dynamic Analysis Of Liquid Sloshing In Spherical Tank Based On SPH Method

The spacecraft needs to carry more fuel to convey more loads and run longer,which means that the liquid sloshing phenomenon in the spacecraft tank needs to be more accurately described.The dynamic behavior of liquid and the force acted on the tank from liquid also need to be clarified.The research methods of liquid sloshing problems have many forms.For the problem of spacecraft spherical tank sloshing with large probability of liquid fracture,the smooth particle fluid dynamics method(SPH method)is selected for modeling analysis.By applying the SPH method's kernel approximation and particle approximation principle,the N-S equations are discretely approximated,and the discretized continuity equation and momentum equation are obtained.The kernel function,stress tensor,boundary problem,neighborhood particle search are selected respectively.The calculation process finally leads to a fluid dynamics model based on the SPH method.Parallel computing methods are designed for three aspects:neighborhood generation,dynamic equation solving and system updating to improve computational efficiency and establish subsequent simulation tasks.Based on the simulation analysis of the force form,fuel content,baffle setting and gravity environment of the spacecraft spherical tank,three tank movement modes(sinusoidal motion,step motion,pulse motion),five fuel liquid vol-umes(h=0.05m,0.075m,0.1m,0.125m,0.15m),five baffle mounting positions(no baffle,h_p=0m,0.025m,0.05m,0.075m)and two gravity environments(g=0m/s~2,-9.8m/s~2)were established.The simulation results show the stress and local pressure of the tank.The simulation results show that the larger the motion acceleration and the more sudden the change,the larger the stress and pressure of the tank and the more likely to oscillate.The larger the volume of the liquid,the greater the force and pressure of the tank.Setting the baffle will suppress the sloshing behavior of the liquid,but under the condition of h_p=0.05m,the suppression effect is best.The sloshing phenomenon in the micro-heavy environment is unique and needs to be verified by relevant experiments.