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首页> 外文期刊>Applied Ocean Research >Boundary element analysis of liquid sloshing characteristics in axisymmetric tanks with various porous baffles
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Boundary element analysis of liquid sloshing characteristics in axisymmetric tanks with various porous baffles

机译：各种多孔挡板轴对称罐中液体晃动特性的边界元分析

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摘要

This paper aims to investigate the effects of the porous baffles on the suppression of sloshing for the tanks with axisymmetric geometries under lateral excitation. Based on the assumptions of inviscid, irrotational, in-compressible liquid and small amplitude sloshing, an axisymmetric boundary element method (BEM) for 3D Laplace equation is derived by using the Green's theorem together with the weighted residual method. And a zoning method is employed to model fluid domain in the tanks with complex porous baffles. Meanwhile, the porous baffles are treated motioning together with the tanks, and the velocity across the porous baffle is assumed to be linearly proportional to the pressure gradient between each side of the porous baffle. And the mechanism of suppressing the sloshing response is mainly the energy dissipation of the fluid passing through the porous baffle. Moreover, the linear free surface boundary conditions are also used to solve the governing equations. Compared with other numerical methods, the most prominent advantage of the BEM in solving axisymmetric potential problem is that only the boundaries of half the cross-section instead of the entire problem domain should be discretized, which can cut down large amount of memory and time costs. The present method is verified by comparing the numerical results with the existing literatures, and excellent agreements are obtained. Meanwhile, the proposed models are applied to investigate the effects of the porous baffles on sloshing response in circular cylindrical, annular cylindrical and conical tanks. The effects of the porous baffle length, porous-effect parameter, installation angle and baffle height on the sloshing force, natural frequency and surface elevation are studied. Additionally, some typical sloshing pressure distributions, velocity potential contours and velocity fields are plotted. The results show that swirls at the tips of the baffles can be observed in many cases, and the top-mounted porous baffle makes more significant suppression effects on sloshing response than that of bottom-mounted porous baffle, while increasing the number of ring porous baffles can achieve better restraint effects on sloshing response. And increasing the baffle length of the horizontal wall-mounted ring porous baffle can significantly decrease the sloshing frequencies, as well as the first non-dimensional natural frequency decreases with decrease in porous-effect parameter of the coaxial porous baffle. In addition, remarkable effects on sloshing can be obtained when reasonable designed by selecting the optimal porous-effect parameter, installation angle and baffle height. And this paper can be a useful guide for the seismic design and analysis of many actual liquid storage tanks (such as the Advanced Passive PWR, large water cooling tower, etc.).
机译：本文旨在探讨多孔挡板对横向激发下轴对称几何形状的罐抑制的影响。基于由托密的假设，通过使用绿色的定理与加权残余方法使用绿色定理来导出3D拉普拉斯方程的轴对称边界元法（BEM）。和分区方法用于用复杂的多孔挡板在罐中模拟流体域。同时，多孔挡板与罐一起运动，并且假设多孔挡板上的速度与多孔挡板的每一侧之间的压力梯度线性成比例。抑制晃动响应的机制主要是通过多孔挡板的流体的能量耗散。此外，线性自由表面边界条件也用于解决控制方程。与其他数值方法相比，求解轴对称潜在问题的BEM最突出的优点是，只能离散横截面代替整个问题域的一半的边界，这可以降低大量的内存和时间成本。通过将数值结果与现有文献进行比较来验证本方法，并且获得了良好的协议。同时，应用所提出的模型来研究多孔挡板对圆柱形，环形圆柱形和圆锥罐中的晃动响应的影响。研究了多孔挡板长度，多孔效应参数，安装角度和挡板高度对晃动力，自然频率和表面高度的影响。另外，绘制了一些典型的晃动压力分布，速度潜在轮廓和速度场。结果表明，在许多情况下，可以观察到挡板的尖端的漩涡，并且顶部安装的多孔挡板对晃动响应的抑制效应比底座多孔挡板更大，同时增加环多孔挡板的数量可以实现对晃动响应的更好的约束效果。并且增加水平壁挂式环多孔挡板的挡板长度可以显着降低晃动频率，以及第一非尺寸自然频率随着同轴多孔挡板的多孔效应参数的降低而降低。此外，通过选择最佳多孔效应参数，安装角度和挡板高度，可以在合理设计时获得对晃动的显着影响。本文可以是许多实际液体储罐的地震设计和分析的有用指南（如先进的被动PWR，大型水冷却塔等）。

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  • 来源
    《Applied Ocean Research》 |2019年第2019期|共32页
  • 作者

    Zang Quansheng; Jun Liu; Long Yu; Gao Lin;

  • 作者单位

    Dalian Univ Technol State Key Lab Coastal &

    Offshore Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol State Key Lab Coastal &

    Offshore Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol State Key Lab Coastal &

    Offshore Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol State Key Lab Coastal &

    Offshore Engn Dalian 116024 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋学;
  • 关键词

    Boundary element method; Axisymmetric; Sloshing; Porous baffle;

    机译：边界元法;轴对称;晃动;多孔挡板;

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