A fully coupled hydrodynamic-DEM model for simulating debris dynamics and impact forces
A fully coupled hydrodynamic-DEM model for simulating debris dynamics and impact forces
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DOI：
10.1016/j.oceaneng.2022.111468
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发表时间：
2022-07
影响因子：
5
通讯作者：
Y. Xiong;Q. Liang;Jinhai Zheng;Jacob Stolle;I. Nistor;G. Wang
中科院分区：
文献类型：
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作者：
Y. Xiong;Q. Liang;Jinhai Zheng;Jacob Stolle;I. Nistor;G. Wang
许多事后现场调查表明，海啸事件期间剧烈的洪水流体动力学和大型漂浮物的影响对建筑物损坏有显着影响。然而，瞬态洪水波，漂浮的碎片，和结构之间的相互作用既没有得到很好的探索和理解，和一些建模工具已经开发出来模拟这些复杂的相互作用的过程，特别是当多个碎片参与。本文介绍了一种新的完全耦合的模拟系统，基于一个高性能的二维流体动力学模型和三维离散元法（DEM）模型，用于模拟多个碎片的运动进行沿着高度对流流和直接量化的结构上的诱导冲击力。将该模型应用于一系列物理实验，结果与实验测量结果吻合较好。它表明，新的耦合建模系统可以捕捉流体之间的相互作用，不同形状和大小和结构的碎片，使其适合于现实世界的应用。该模型为模拟海啸或山洪暴发造成的极端灾害并评估其风险提供了一个新的强大工具，因此有可能有助于在这些风险地区规划和设计减少灾害风险的计划。
Many post-event field investigations suggest that dramatic flood hydrodynamics and impact of large floating objects contribute significantly to building damage during a tsunami event. However, the interactions between the transient flood waves, floating debris, and structures have neither been well explored nor understood, and few modelling tools have been developed to simulate these complex interactive processes, especially when multiple debris are involved. This paper introduces a novel fully coupled modelling system, based on a high-performance 2D hydrodynamic model and a 3D discrete element method (DEM) model, for simulating the movement of multiple debris carried along by highly convective flows and directly quantifying the induced impact forces on structures. The proposed model is applied to reproduce a series of physical experiments, and the results agree well with the experimental measurements. It is demonstrated that the newly coupled modelling system can capture the interaction between the fluid, debris of different shapes and sizes and structures, making it suitable for real-world applications. The model provides a new robust tool for simulating the extreme hazards caused by tsunamis or flash flooding and assessing their risk, and therefore has the potential to be useful for planning and designing disaster risk reduction schemes in those at-risk areas.