| Issue |
E3S Web of Conf.
Volume 415, 2023
8th International Conference on Debris Flow Hazard Mitigation (DFHM8)
|
|
|---|---|---|
| Article Number | 01007 | |
| Number of page(s) | 5 | |
| Section | Processes and Mechanics | |
| DOI | https://doi.org/10.1051/e3sconf/202341501007 | |
| Published online | 18 August 2023 | |
Numerical investigation of particle dynamic behaviours in geophysical flows considering solid-fluid interaction
1 State Key Laboratory of Hydroscience and Engineering, Tsinghua University, China
2 Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai, China
3 Section 4.7: Earth Surface Process Modelling, German Research Centre for Geosciences (GFZ), Potsdam 14473, Germany
* Corresponding author: yifeicui@mail.tsinghua.edu.cn
Solid-fluid interaction vitally influences the flow dynamics of particles in a geophysical flow. A coupled computational fluid dynamics and discrete element method (CFD-DEM) is used in this study to model multiphase geophysical flow as a mixture of fluid and solid phases. The two non-Newtonian fluids (i.e., Bingham and Hershcel-Bulkley fluids) and water mixed with particles are considered in the simulation, while dry granular flow with the same volume is simulated as a control test. Results revealed that the solid-fluid interaction heavily governs the particle dynamic behaviours. Specifically, compared to dry case, particles in three multiphase cases are characterized by larger flow mobility and greater shear rate while smaller basal normal force. In addition, a power-law distribution with a crossover to a generalized Pareto Distribution is recommended to fit the distribution of normalized interparticle contact force.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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