期刊
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
卷 359, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cma.2019.112750
关键词
Landslide; Impulse wave; Resolved CFD-DEM approach; Immersed boundary method; Conservative Level Set method
资金
- National Key R&D Program of China [2017YFC1501100, 2018YFC0406705]
- China Postdoctoral Science Foundation Funded Project [2019M651677]
- Fok Ying-Tong Education Foundation for Young Teachers in the Higher Education Institutions of China [151073]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [YS11001]
- Qing Lan Project
Landslides and subsequent impulse waves could result in destructive hazards, while most of the existing simulation methods are dependent on over simplifications or excessive hypothesis due to the numerical difficulties. In order to elaborately present the phenomenon of the strong coupling and the mechanism of the energy transfer between the fluid phases and the landslides, a novel resolved computational fluid dynamics-discrete element method (CFD-DEM) is proposed in this paper. The fluid phases, including the water and the air, are governed by the full Navier-Stokes equations in the Eulerian framework, whereas the landslide motion is modeled by the discrete element method using the Lagrangian description. The key challenge, namely the representation of the moving interfaces between the fluid and the landslides in different frameworks, is handled by the immersed boundary method. Meanwhile, the free surface of the impulse waves between the water and the air is captured by the conservative Level Set method, and the coupled system is solved by the partitioned method in an iterative way to obtain the strong coupling effect. Compared with the unresolved CFD-DEM method, the proposed approach calculates the fluid field with high resolution and reflects the mutual interaction precisely. After the verification of the overall performance by two benchmark cases, the resolved CFD-DEM method is applied to simulate the landslide movement and the subsequent generated waves in the Lituya Bay. (C) 2019 Elsevier B.V. All rights reserved.
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