Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai 600036, India.
Phys Rev E. 2019 Feb;99(2-1):023308. doi: 10.1103/PhysRevE.99.023308.
Liquid impact on a rigid wall is a common feature in the context of marine structures, as most of them are exposed continuously to breaking waves. In the present paper, a comparison and analysis of the impact load estimates obtained from free surface lattice Boltzmann (LB) simulation with the experimental measurements from available literature have been reported. Initially, two-dimensional simulation of the dam break impact on the wall is performed with two different LB models: BGK-F1: a Bhatnagar-Gross-Krook (BGK) collision operator with the force scheme of Buick and Greated [Phys. Rev. E 61, 5307 (2000)1063-651X10.1103/PhysRevE.61.5307], and MRT-F2: a multiple relaxation time (MRT) operator with the force scheme of Guo et al. [Phys. Rev. E 65, 046308 (2002)1063-651X10.1103/PhysRevE.65.046308]. The pressure estimates obtained from BGK-F1 over MRT-F2 are closer to the measurements, though the other key parameters, such as the waterfront evolution and the free surface profile, have not shown significant variations. Furthermore, the three-dimensional dam break simulation has been performed using BGK-F1 for three test cases: (i) impact on a wall, (ii) impact on a rectangular obstacle, and (iii) impact on a tall tower. In all the test cases, the load estimates are in agreement with the experimental measurements.
液体冲击刚性壁面是海洋结构物中的常见现象，因为大多数海洋结构物都持续暴露在破浪冲击下。本文报告了用自由表面格子 Boltzmann（LB）模拟获得的冲击载荷估计值与现有文献中实验测量值的比较和分析。最初，用两种不同的 LB 模型对堤坝决堤冲击壁面进行二维模拟：BGK-F1：带有 Buick 和 Greated 力场的 Bhatnagar-Gross-Krook（BGK）碰撞算子[Phys. Rev. E 61, 5307 (2000)1063-651X10.1103/PhysRevE.61.5307]；MRT-F2：带有 Guo 等人力场的多重松弛时间（MRT）算子[Phys. Rev. E 65, 046308 (2002)1063-651X10.1103/PhysRevE.65.046308]。尽管其他关键参数，如水线演变和自由表面轮廓，没有显示出显著变化，但 BGK-F1 获得的压力估计值比 MRT-F2 更接近测量值。此外，用 BGK-F1 对三个测试案例进行了三维堤坝决堤模拟：（i）冲击壁面，（ii）冲击矩形障碍物，（iii）冲击高塔。在所有测试案例中，载荷估计值与实验测量值一致。
