The role of fluid drag force in the dynamic process of two-phase flow-like landslides

During the landslide mobility process, there is a dynamic interaction between the sliding main body and the different surrounding media. This affects the mobility characteristics of the landslide, particularly the friction force and contact force, which play the significant roles of dissipating and...

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Bibliographic Details
Published in:Landslides 2022-07, Vol.19 (7), p.1791-1805
Main Authors: Gao, Yang, Yin, Yueping, Li, Bin, Wei, Tongyao, Li, Zhuang, Gao, Haoyuan
Format: Article
Language:English
Subjects:
Agriculture
CAD
Civil Engineering
Computational fluid dynamics
Computer aided design
Computer applications
Contact force
Discrete element method
Drag
Dynamic characteristics
Earth and Environmental Science
Earth Sciences
Failure analysis
Fluid dynamics
Flumes
Geography
Hydrodynamics
Landslides
Landslides & mudslides
Liquid phases
Mobility
Multiphase flow
Natural Hazards
Sliding
Slumping
Solid phases
Solvers
Technical Note
Two phase flow
Viscosity
Viscosity coefficient
Viscosity coefficients
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Summary:During the landslide mobility process, there is a dynamic interaction between the sliding main body and the different surrounding media. This affects the mobility characteristics of the landslide, particularly the friction force and contact force, which play the significant roles of dissipating and transferring energy in the sliding main body, respectively. In order to analyze the dynamic characteristics of rapid and long-runout landslides, the discrete element method solver of EDEM software and the computational fluid dynamics code of ANSYS-Fluent solver for a two-phase flow-like landslide, combined with flume tests and a field case, were used to research the following points: (1) When the liquid volume fraction is large enough during the mobility process of a two-phase flow-like landslide, the liquid phase provides a certain drag force relative to the solid phase. (2) The drag force was determined from the volume fraction of the liquid, the solid–liquid velocity difference, and the viscosity coefficient of the liquid, which together affect the characteristics of the landslide’s mobility and accumulation. (3) According to the back analysis of the Xianchi Reservoir landslide, fluid drag force plays an important role in the actual landslide mobility process. Therefore, it is necessary to consider the influence of the fluid drag force in hazard zoning and the post-failure mobility process analysis of large-scale flow-like landslides.
ISSN:1612-510X
1612-5118
DOI:10.1007/s10346-022-01858-y