Dry and immersed granular column collapse: Flow dynamics and transient rheology
文献类型：期刊论文
| 作者 | Lin, Jiayu3; Zhao, Tao3; Jiang, Mingjing1,2 |
| 刊名 | POWDER TECHNOLOGY
 |
| 出版日期 | 2025-03-15 |
| 卷号 | 453页码:12 |
| 关键词 | CFD-DEM Granular column collapse Dynamics Transient rheology Non-local behavior |
| ISSN号 | 0032-5910 |
| DOI | 10.1016/j.powtec.2025.120679 |
| 英文摘要 | The granular column collapse is a simplified and widely adopted model to study natural geological flows, such as landslides, debris flow, and rock avalanches. Understanding the complex dynamics and rheology of these granular flows is crucial in the engineering and geophysics realms. Here, the collapse of granular columns was investigated in both dry and immersed conditions, via the coupled CFD-DEM method with explicit consideration of particle angularity. The flow dynamics incorporating the 'delayed effect' provided by the high angularity and ambient fluid were fully characterized by the temporal evolution of energy, granular temperature and statistical characteristics of particle velocities, based on which the transition of failure mode during the collapsing process was clarified. Subsequently, the local rheology check was conducted in different flow stages to reveal the underlying flow mechanism. The ambient fluid decelerated the dilation behavior of dense granular assembly leading to greater quasi-static friction coefficients in the early stage followed by the granular flow in the critical state. In addition, the distinct fluid-solid transition behavior in different flow stages was interpreted through the friction coefficient- inertial number (mu- I), and viscosity- inertial number (eta- I) correlations. Especially, the progressive failure process controlled by the granular temperature-related 'non-local' mechanism was captured and clarified, which will further contribute to the continuum modelling of granular collapse. |
| 资助项目 | Major Pro-gram of National Natural Science Foundation of China[51890911] ; Guangxi Science and Technology Major Program[GUI-KEAA23073005] ; Key Technologies R & D Program of Guangxi[GUIKE AB22080073] ; State Key Laboratory of Disaster Reduction in Civil Engineering[SLDRCE19-A-06] |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001420306900001 |
| 出版者 | ELSEVIER |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/36914]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Zhao, Tao |
| 作者单位 | 1.Tongji Univ, Coll Civil Engn, Shanghai 200092, Peoples R China 2.Suzhou Univ Sci & Technol, Sch Civil Engn, Suzhou 215009, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn Safety, Wuhan 430071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lin, Jiayu,Zhao, Tao,Jiang, Mingjing. Dry and immersed granular column collapse: Flow dynamics and transient rheology[J]. POWDER TECHNOLOGY,2025,453:12. |
| APA | Lin, Jiayu,Zhao, Tao,&Jiang, Mingjing.(2025).Dry and immersed granular column collapse: Flow dynamics and transient rheology.POWDER TECHNOLOGY,453,12. |
| MLA | Lin, Jiayu,et al."Dry and immersed granular column collapse: Flow dynamics and transient rheology".POWDER TECHNOLOGY 453(2025):12. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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