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An optimized volume of fluid method for modelling three-dimensional debris flows. Implementation in OpenFOAM, validation, and application in the Aiwa Watershed, Beijing

2022; Elsevier BV; Volume: 144; Linguagem: Inglês

10.1016/j.compgeo.2022.104651

1873-7633

Yan Zhang, Liqun Lyu, Peng Li,

Soil and Unsaturated Flow

Debris flows are a common type of geological hazard. They move down slopes at rapid speeds, causing severe damage to buildings and humans. It is of great significance to study the development and movement characteristics of debris flows. In this study, we developed a numerical method of simulating the movement of debris flows. The phase fraction was used to represent the contents of the debris flow components. The Herschel–Bulkley–Papanastasiou model was used to simulate the movement of the fine particle–water mixture in the debris flow, and the pressure-dependent Coulomb viscoplastic model was used to describe the movement of the gravel-size particles. The interface between the debris flow and the air was obtained using the volume of fluid method. The above models were implanted in OpenFOAM. Finally, indoor experimental data were used to verify the numerical method developed in this study, and the experimental and simulation results were found to be in good agreement. The proposed method was then applied to debris flow prediction in the Aiwa Watershed, Beijing. The homogeneous flow model developed in this study can significantly reduce the number of calculations required and can be used for the three-dimensional simulation of large-scale debris flows.