Numerical simulation of liquid sloshing phenomena in partially filled containers
Numerical simulation of liquid sloshing phenomena in partially filled containers
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DOI：
10.1016/j.compfluid.2008.09.003
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发表时间：
2009-04
影响因子：
2.8
通讯作者：
Y. Chen;K. Djidjeli;W. Price
中科院分区：
文献类型：
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作者：
Y. Chen;K. Djidjeli;W. Price
在模拟半满液舱内液体晃动激励的动载荷时，需要施加适当的边界条件来计算冲击压力。传统的方法是在罐顶附近设置一个薄的人工缓冲区，在缓冲区内施加自由表面动力边界条件和刚性壁边界条件的线性组合。这项调查表明，不需要特殊的处理来描述自由表面，因为基于水平集方法的两种流体方法被用来解决在水和空气区域中的雷诺平均Navier-Stokes（RANS）方程，并且界面被视为流体性质的变化。所采用的边界条件都是在Navier-Stokes方程或Euler方程的解中通常接受的边界条件。在不同的填充水平和激励频率下，数值评估了水平简谐运动激励下矩形贮箱中的晃动。研究了网格分辨率、时间步长和界面厚度对数值解的影响。此外，数值试验进行了一个矩形坦克与45°和60°倒角天花板角落受到谐波滚动运动。计算结果与实验数据的比较表明，所开发的数值方法能够模拟由流体晃动引起的作用在罐壁和罐顶上的动压力载荷。
In the simulation of the dynamic load excited by sloshing in a partially filled tank, appropriate boundary conditions need imposing to calculate the impact pressure. Traditionally, a thin artificial buffer zone is adopted near the tank ceiling and a linear combination of free surface dynamic and rigid wall boundary conditions are imposed inside the buffer zone. This investigation demonstrates that no special treatment is needed to describe the free surface, because a two-fluid approach based on a level set method is used to solve the Reynolds-averaged Navier–Stokes (RANS) equations in both water and air regions and the interface is treated as a variation of the fluid properties. All the boundary conditions adopted are those usually accepted in solutions of Navier–Stokes or Euler equations. Sloshing in a rectangular tank excited by a horizontal harmonic motion is assessed numerically at different filling levels and excitation frequencies. The dependency of numerical solution on grid resolution, time step size and the interface thickness are investigated. Further, numerical tests are conducted for a rectangular tank with both 45° and 60° chamfered ceiling corners subject to a harmonic rolling motion. The comparison of computed results with experimental data show the developed numerical method is capable of the simulation of dynamic pressure loads exerted on the tank walls and ceiling excited by fluid sloshing.