基于SPH方法的二维液舱晃荡特性研究

Sloshing characteristics of a 2D rectangular tank based on SPH method

本文基于流固耦合动力学理论,建立二维液舱晃荡的光滑粒子流体动力学模型,并引入Dummy边界处理固定边界问题。首先,与实验结果对比验证模型的有效性;随后,分析不同横摇激励、多种载液率下自由液面的运动规律,研究液体抨击舱壁产生的压力特性;在此基础上,设计单一隔板和组合隔板等不同制荡结构,探究共振频率、30%载液率下,自由液面形态和壁面冲击压力的特性。结果表明:在共振频率下,横摇幅值对压力峰值的影响最大;随着载液率的增加,壁面抨击压力双峰特性逐渐消失;当隔板尺度较小时,T型隔板更有利于降低压力的整体水平;双T型隔板可有效降低舱底冲击。

Based on the theory of fluid-structure coupling dynamics,a smoothed particle hydrodynamic model of a two-dimensional rectangular tank was established.Dummy particles were utilized for the treat⁃ment of wall boundary in the simulation.Firstly,the effectiveness of the model was verified by comparing sim⁃ulation results with experimental results.Then,the effects of rolling excitations and various liquid filling lev⁃els on impact pressure were discussed.On this basis,different baffle structures were designed,including sin⁃gle and combined baffles.After that,the characteristics of free liquid surface morphology and impact pres⁃sure were investigated at the resonance frequency and 30%filling rate.The results show that(1)the roll am⁃plitude has the greatest effect on the pressure peak at the resonance frequency;(2)with the increase of filling level,the double peak characteristics of impact pressure disappear gradually;(3)the T-baffle is beneficial to reduce the level of impact load as the baffle scale is small;(4)and the double T-shaped baffle is effective in reducing impact force at the bottom of the tank.