Multi-phase flow simulation of landslide dam formation process based on extended coupled DEM-CFD method
Multi-phase flow simulation of landslide dam formation process based on extended coupled DEM-CFD method
复制标题
基于扩展耦合DEM-CFD方法的滑坡坝形成过程多相流模拟
DOI：
10.1016/j.compgeo.2021.104438
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发表时间：
2021-12
影响因子：
5.3
通讯作者：
Xingsen Guo
中科院分区：
文献类型：
--
作者：
Ting-kai Nian;Dong-yang Li;Qiuhua Liang;Hao Wu;Xingsen Guo
在滑坡坝形成过程中所涉及的滑坡-河流相互作用和冲击波可能不是微不足道的，也没有得到广泛的研究和模拟。本文采用耦合离散元法（DEM）和计算流体力学（CFD）结合流体体积法（VOF）对滑坡坝的形成过程及其在冲击河流中的自由地表流动动力学进行了数值研究。通过一系列涉及三相相互作用和自由曲面演化的测试案例，验证了扩展耦合方法的准确性和有效性。然后应用该模型模拟了不同运动特征的滑坡和河流流情景下的滑坡坝形成过程。定量分析了坝体形态的复杂演化过程和冲击波的动态演化过程。研究发现，滑坡、水流和河谷之间的相互作用驱动了坝的形成过程。滑坡速度对冲击波的传播有较大的影响，而河流流速在上游和下游对坝体形态的控制则相反。该研究为了解滑坡坝的形成机制提供了一个实用的建模框架，并支持在灾害预测和减灾方面的应用。
The landslide-river interaction and the impulse waves involved in the landslide dam formation process may not be insignificant and have not been extensively investigated and simulated. This paper presents a numerical investigation on the formation process of landslide dams and resulting free surface flow dynamics in the impacted river via coupled discrete element method (DEM) and computational fluid dynamics (CFD) with the volume of fluid (VOF). The accuracy and validity of the extended coupled method are verified using a series of test cases involving three-phase interaction and free surface evolution. It is then applied to simulate the landslide dam formation processes related to landslide and river flow scenarios of different kinematic characteristics. Furthermore, quantitative analysis is performed to describe the complex evolution of the dam morphology and dynamic evolution of impulse waves. It is found that the impact between the landslide, river flow and valley drives the dam formation process. The landslide velocity considerably influences the propagation of impulse waves, while the river flow velocities control the dam morphology in opposite ways in the upstream and downstream. This research provides a practical modeling framework to understand the formation mechanism of landslide dams and support applications in hazard prediction and mitigation.
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