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- Title
A numerical study of viscous granular flow in artificial step-pool systems: flow characteristics and structure optimization.
- Authors
Bi, Yu-zhang; Li, Meng-jie; Wang, Dong-po; Zheng, Lu; Yan, Shuai-xing; He, Si-ming
- Abstract
Inspired by the geomorphologic phenomenon of step-pool bed configuration, analogous dissipation structures are set in drainage channels to mitigate granular flow hazards. The sensible design of artificial step-pool systems remains an important and open issue. The discrete element method was utilized in this study to investigate the flow characteristics of viscous granular flow in an artificial step-pool system, and an optimization was proposed. First, a numerical model of the granular flow–structure interaction was given and validated. The influence of design parameters on the velocity reduction ratio P and peak impact force F max was then investigated. Finally, a new step-pool system was presented and evaluated. The results reveal that: (1) P decreases linearly as the slope i increases. The relative layout spacing ω enhances P , but reduces the efficiency of velocity control per unit length structure; (2) the increase in ω stabilizes the distribution of F max on 2# to 5# baffles. There exists a "peak effect" of the average peak impact force F a with the variation of the impact angle β and the relative baffle height ψ (when β = 75° or ψ = 0.27, the F a reaches a maximum); (3) the optimized structure can control the phenomenon of granular jump while having good guiding performance and more stable impact characteristics. The energy dissipation rate E of optimized structure reaches 91%, an increase of nearly 24% over the original structure.
- Subjects
GRANULAR flow; VISCOUS flow; DISCRETE element method; ENERGY dissipation
- Publication
Acta Geotechnica, 2023, Vol 18, Issue 12, p6275
- ISSN
1861-1125
- Publication type
Article
- DOI
10.1007/s11440-023-01933-1