Liquid sloshing inside a tank with a slotted porous screen at the center is studied based on numerical and experimental methods. Slotted screens with three different porosities (0.0964, 0.1968 and 0.3022) for two submergence depths of 1 and 2 cm have been considered. One of the main advantages of the slotted screens is that the resonance frequency of the sloshing tank can be altered and the sloshing-induced motion/load can be suppressed by energy dissipation across the porous screen. The complexities of slotted screens equipped in a sloshing tank are accompanied by wave breaking, jet formation and liquid fragmentations which are commonly seen phenomena across the porous screen. These violent free surface behaviors in a tank are studied based on numerical simulations using the incompressible turbulent model and compared with the experiments. For the numerical sloshing tank with porous screen, free surface elevation and pressure at the tank wall are in good agreement with the experimental results. The adopted numerical technique will be able to capture the nonlinear free surface wave profile, air entrapment and jet formation across the screen in agreement with the experiments. For the fully submerged screen, the lowest resonance period shifted slightly to higher values. The sloshing tank equipped with porous screen of 0.1968 for the fully submerged screen predicted lower values of the amplification factor and pressure at the tank wall compared to other cases.

中文翻译：

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狭缝多孔筛网减轻矩形罐内液体晃动

基于数值和实验方法研究了以开槽多孔筛网为中心的罐内液体晃动。已经考虑了具有三种不同孔隙率（0.0964、0.1968 和 0.3022）的开槽筛网，用于 1 和 2 厘米的两个浸没深度。开槽筛网的主要优点之一是可以改变晃荡罐的共振频率，并且可以通过多孔筛网上的能量耗散来抑制晃动引起的运动/负载。配备在晃动罐中的狭缝筛网的复杂性伴随着波浪破碎、射流形成和液体破碎，这些都是多孔筛网中常见的现象。基于使用不可压缩湍流模型的数值模拟并与实验进行比较，研究了储罐中这些剧烈的自由表面行为。对于多孔筛板数值晃荡罐，罐壁自由液面高程和压力与实验结果吻合较好。所采用的数值技术将能够捕获与实验一致的非线性自由表面波轮廓、空气截留和穿过屏幕的射流形成。对于完全浸没的屏幕，最低共振周期略微移动到更高的值。与其他情况相比，装有 0.1968 多孔筛网的晃动罐用于完全浸没的筛网，预测的放大系数和罐壁压力值较低。所采用的数值技术将能够捕获与实验一致的非线性自由表面波轮廓、空气截留和穿过屏幕的射流形成。对于完全浸没的屏幕，最低共振周期略微移动到更高的值。与其他情况相比，装有 0.1968 多孔筛网的晃动罐用于完全浸没的筛网，预测的放大系数和罐壁压力值较低。所采用的数值技术将能够捕获与实验一致的非线性自由表面波轮廓、空气截留和穿过屏幕的射流形成。对于完全浸没的屏幕，最低共振周期略微移动到更高的值。与其他情况相比，装有 0.1968 多孔筛网的晃动罐用于完全浸没的筛网，预测的放大系数和罐壁压力值较低。