Shear Behaviors of Confined Flow: Insights for Understanding the Influences of Fractal Particle Size Distribution on High Mobility of Granular Flows
Abstract Granular flows, such as rockslide debris flows, can reach high velocities and travel vast distances, but mechanisms behind this high mobility remain elusive. Using the Discrete Element Method, we implement confined shear flow with fractal particle size distribution to study the physical mec...
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| Format: | Article |
| Language: | English |
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Wiley
2024-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL108956 |
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| author | Zhaowei Ding Wei Hu Chingshung Chang Yan Li Gonghui Wang |
| author_facet | Zhaowei Ding Wei Hu Chingshung Chang Yan Li Gonghui Wang |
| author_sort | Zhaowei Ding |
| collection | DOAJ |
| description | Abstract Granular flows, such as rockslide debris flows, can reach high velocities and travel vast distances, but mechanisms behind this high mobility remain elusive. Using the Discrete Element Method, we implement confined shear flow with fractal particle size distribution to study the physical mechanisms inside the highly localized basal zones. Our results show that the shear strength of confined flow decreases at large fractal dimensions, and a notable transition in shear behavior also occurs with increasing fractal dimension: large particles exhibit low granular temperature and act as solid phase within a semi‐diluted suspension, and small particles enter the rolling regime. The small particles behave as interstitial fluids and reduce the shear strength of confined flow. We suggest that the reduction of shear strength stemming from the fractal particle size distribution may provide insights into the mechanisms within the highly localized basal zones, ultimately contributing to the high mobility of granular flows. |
| format | Article |
| id | doaj-art-4663fe154e0b4891995e37cd89ae7bef |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-4663fe154e0b4891995e37cd89ae7bef2025-08-20T01:51:55ZengWileyGeophysical Research Letters0094-82761944-80072024-07-015114n/an/a10.1029/2024GL108956Shear Behaviors of Confined Flow: Insights for Understanding the Influences of Fractal Particle Size Distribution on High Mobility of Granular FlowsZhaowei Ding0Wei Hu1Chingshung Chang2Yan Li3Gonghui Wang4State Key Laboratory of Geo‐Hazard Prevention and Geo‐Environment Protection Chengdu University of Technology Chengdu ChinaState Key Laboratory of Geo‐Hazard Prevention and Geo‐Environment Protection Chengdu University of Technology Chengdu ChinaDepartment of Civil and Environmental Engineering University of Massachusetts Amherst MA USAState Key Laboratory of Geo‐Hazard Prevention and Geo‐Environment Protection Chengdu University of Technology Chengdu ChinaDPRI Kyoto University Kyoto JapanAbstract Granular flows, such as rockslide debris flows, can reach high velocities and travel vast distances, but mechanisms behind this high mobility remain elusive. Using the Discrete Element Method, we implement confined shear flow with fractal particle size distribution to study the physical mechanisms inside the highly localized basal zones. Our results show that the shear strength of confined flow decreases at large fractal dimensions, and a notable transition in shear behavior also occurs with increasing fractal dimension: large particles exhibit low granular temperature and act as solid phase within a semi‐diluted suspension, and small particles enter the rolling regime. The small particles behave as interstitial fluids and reduce the shear strength of confined flow. We suggest that the reduction of shear strength stemming from the fractal particle size distribution may provide insights into the mechanisms within the highly localized basal zones, ultimately contributing to the high mobility of granular flows.https://doi.org/10.1029/2024GL108956particle size distributionfractal dimensiongranular flowshigh mobility |
| spellingShingle | Zhaowei Ding Wei Hu Chingshung Chang Yan Li Gonghui Wang Shear Behaviors of Confined Flow: Insights for Understanding the Influences of Fractal Particle Size Distribution on High Mobility of Granular Flows Geophysical Research Letters particle size distribution fractal dimension granular flows high mobility |
| title | Shear Behaviors of Confined Flow: Insights for Understanding the Influences of Fractal Particle Size Distribution on High Mobility of Granular Flows |
| title_full | Shear Behaviors of Confined Flow: Insights for Understanding the Influences of Fractal Particle Size Distribution on High Mobility of Granular Flows |
| title_fullStr | Shear Behaviors of Confined Flow: Insights for Understanding the Influences of Fractal Particle Size Distribution on High Mobility of Granular Flows |
| title_full_unstemmed | Shear Behaviors of Confined Flow: Insights for Understanding the Influences of Fractal Particle Size Distribution on High Mobility of Granular Flows |
| title_short | Shear Behaviors of Confined Flow: Insights for Understanding the Influences of Fractal Particle Size Distribution on High Mobility of Granular Flows |
| title_sort | shear behaviors of confined flow insights for understanding the influences of fractal particle size distribution on high mobility of granular flows |
| topic | particle size distribution fractal dimension granular flows high mobility |
| url | https://doi.org/10.1029/2024GL108956 |
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