Analysis Of Sloshing Height Of Fluid In Liquid Storage Structure With Sloping Bottom

The fluid sloshing in the liquid storage structure is widely used in civil engineering:water conservancy,aerospace,chemical industry nuclear power engineering and other fields.Usually,the top of the liquid storage structure needs to be closed with a cover.When the earthquake comes,the fluid will generate a vertical height,which will cause damage to the roof after contacting the roof,so the liquid surface needs to be kept a certain distance from the cover plate.At present,most of the related researches on rectangular liquid storage structures are limited to flat bottom surfaces.However,due to the diversity of terrain,when the bottom surface of liquid storage structures is required to be inclined at a certain angle,it is necessary to calculate and study the fluid sloshing problem of such liquid storage structures.In order to obtain the optimal distance between.the top cover and the liquid level,the problem of fluid small sloshing under horizontal excitation is discussed.The seismic forced linear sloshing of fluid in a two-dimensional rectangular liquid storage structure with sloping bottom is studied.Based on the linear potential theory of a fluid,the analytical solution of the equivalent mechanical model of fluid sloshing in a rectangular liquid storage structure with sloping bottom is derived.It greatly simplifies the calculation of fluid-structurre interaction and obtains the maximum sloshing height of the fluid surface.The SHELL 181 and FLUID80 elements of AN SYS software are used to model the three-dimensional model of the rectangular liquid storage structure with sloping bottom considering fluid sloshing.The mapping meshing method is used,and the soli d and liquid domains are uniformly divided into meshes.The direct coupling method is used to analyze the fluid-structure interaction.Assuming that the wall of liquid storage structure is rigid:the model is excited by horizontal sine wave.The finite element software simulation results are compared with the analytical solution of analytical solutions.The results show that the two are in good agreement,and the correctness of the analytical solution given in this paper is verified.By analyzing the finite element model,it is concluded that the higher the inclination of the bottom of the liquid storage structure is,the higher the wave height is.