Study On The Influence Of Wall Structure On Fluid Sloshing

The phenomenon of sloshing in tanks is widespread in the field of marine engineering.The damage to the tank caused by fluid sloshing may cause structural failure and instability of carrying equipment.How to reasonably restrain fluid sloshing is an engineering scientific problem that needs to be solved urgently.Because the fluid often entrains air and hits the tank during the sloshing process,this article will consider the compressibility of air and analyze the different physical quantities to study the suppression effect of the wall structure on the sloshing and the influence mechanism.Firstly,establish a calculation model for the tank and determine a calculation method that is consistent with the sloshing study.Furthermore,the numerical simulation results are compared with theoretical results and experimental results to provide a reliable basis for the next research.On this basis,a grid independence test is performed to ensure calculation accuracy while reducing time costs.Secondly,this paper conducts sloshing research on the shape of the solid wall structure and the angle change between the lower boundary of the wall structure and the vertical wall.Analyze the influence of the angle between the shape and the wall on the sloshing under different excitation frequencies.Prove the mechanism of wall structure and shape to restrain fluid sloshing,and the influence law of angle between lower boundary of wall structure and vertical wall on maximum load.The main effects are as follows: On the one hand,the solid wall structure changes the fluid slamming mode,and affects the sloshing load distribution and its action time.The structure on the wall can increase the intensity of turbulence and improve energy dissipation.At the same time,reduce the impulse of the fluid on the wall.On the other hand,the solid wall structure hinders the conversion of fluid from kinetic energy to gravitational potential energy,resulting in local pressure concentration in the lower region.By analyzing physical quantities such as sloshing load,flow field density,turbulent kinetic energy and kinetic energy dissipation,this paper considers that square(two-dimensional)or cube(three-dimensional)is a relatively reasonable wall solid structure shape in suppressing sloshing.Then,study the influence of the porosity,particle size and position of the porous medium relative to the static free liquid surface on the sloshing.By changing the porous parameters,the effectiveness of the porous medium on sloshing suppression is proved,and the optimized porous parameters and positions are given.On this basis,the influence of the type of porous media on fluid sloshing is discussed.Through careful analysis of the pressure field,velocity field,turbulent kinetic energy and other physical quantities,the results show that the porous medium changes the fluid slamming form by changing the velocity direction of the fluid.By weakening the velocity of the fluid,the impact kinetic energy of the fluid is directly consumed.Finally,the study under high liquid loading rate is carried out.Through the analysis of force and moment results,found that the suppression of the resultant force by the porous medium is more obvious than that of the solid wall structure,and the solid wall structure has more advantages in terms of moment suppression.Therefore,this paper combines the solid wall structure with the porous medium.By changing the combination form,it is found that the porous medium closest to the free liquid surface is the dominant factor in suppressing sloshing.In summary,in the subsequent engineering design and research,the combination of solid wall structure and porous medium can be selected as an effective means to simultaneously suppress sloshing loads and maintain the overall stability of the tank.