The Numerical Simulation On Design Parameters Of Suppressing Device In A Tank

With the continuous improvement of the performance of the liquid-carrying system,the liquid-carrying capacity of the tank has been increasing,and the requirements for the design ability of large-scale tanks have been increasing.The liquid inside a large liquid tank will slosh after being excited by the outside,especially when the excitation frequency is near the natural frequency of the system,the sloshing is the most intense.Severe sloshing will produce a strong impact load on the bulkhead and then affect the tank and the entire ship system.In this paper,the smooth particle hydrodynamics method(SPH)is used for numerical simulation.This method is a kind of meshless method.It does not need to mesh the flow field.Instead,the differential equations(groups)are discretized onto a series of independent fluid particles,and the numerical solutions are obtained by solving the linear equations.The problem of sloshing,which has a free surface that can move freely,has obvious advantages.This paper discusses in detail the basic idea of the SPH method,the SPH integral representation method of functions and their derivatives,and the particle approximation of the kernel function of SPH method.The basic equations of the SPH method are established after the basic equations of fluid dynamics are discretized.The basic concepts such as artificial viscosity and particle search method are analyzed.A two-dimensional rectangular tank hydrodynamic numerical model is established,an improved boundary condition,the mirror particle boundary method is used as the solid wall boundary,and the pressure is calculated by the equation of state.Taking a two-dimensional rectangular tank as an example,this paper uses the SPH method to numerically simulate the sloshing problem.After comparing the numerical simulation results with the experimental results,the feasibility of this method to deal with the sloshing problem is verified.In addition,the influence of different types of baffles in rectangular tanks under a wide range of excitation frequencies,as well as the impact load and liquid wave surface characteristics during sloshing are discussed especially swing control effect of vertical,horizontal,rigid and plastic roof long baffles.And the reasons for different baffles to suppress sloshing are analyzed.It is found that baffles can effectively increase the damping ratio in the system,change the natural frequency of the system,and reduce the degree of liquid sloshing.Therefore,baffles can improve the structural safety and stability of the entire system.