内置垂直格栅矩形TLD水箱液体晃动特征的CFD数值模拟

CFD Numerical simulation of the liquid sloshing characteristics of a rectangular TLD tank with vertical screens

为研究内置垂直格栅矩形TLD(Tuned Liquid Damper)水箱在外加水平激励下液体的晃动特征,文章基于计算流体动力学(Computational Fluid Dynamics,CFD)方法,建立了相应的TLD水箱模型,并利用FLUENT软件进行液体晃动的力学性能数值模拟。将文章CFD数值模拟结果与已有类似试验的实验数据进行对比分析,进一步验证了CFD数值模拟结果的正确性。研究结果表明:①随底部水平外激励幅值的增加,液体晃动非线性逐步加剧,液体晃动幅度、阻尼比增大,无量纲水平控制力最大值逐步减小;②把垂直格栅放置在液体一阶晃动模态的归一化最大振幅处,能够有效地抑制液体晃动的非线性现象,垂直格栅放置位置越靠近水箱中部,TLD系统阻尼比越大;③随着TLD系统的水深比增大,内置垂直格栅构件的布置位置和尺寸相同时,TLD系统的阻尼比逐渐减小。

The structural behavior of liquid sloshing in a rectangular Tuned Liquid Damper(TLD)water tank with built-in vertical screens under external horizontal excitation is investigated by Computational Fluid Dynamics(CFD)method,the mechanical properties of liquid sloshing are numerically simulated by FLUENT software.The CFD simulation results in this paper are also compared with the experimental data with a similar configuration of water tank with vertical screens,which further verifies the effectiveness of the proposed CFD numerical simulation method.The numerical simulation results show that with the increase in the amplitude of the horizontal external excitation at the bottom of the tank,the nonlinearity of the liquid sloshing gradually intensifies.Meanwhile the amplitude of wave height of free surface and damping ratio of TLD system increase,but the amplitude of non-dimensional horizontal control force gradually decreases.Setting the vertical screen at the location of the maximum amplitude of the first sloshing mode was found to effectively suppress the nonlinear phenomenon of liquid sloshing.The closer the vertical screen is placed near to the middle location of the water tank,the more value in the damping ratio of TLD system could produce.Numerical analyzed results show that the increase in water-depth ratio of TLD system could result in the decrease in the damping ratio of TLD system gradually.