NUMERICAL STUDY OF INTERACTION BETWEEN GRANULAR FLOW AND AN ARRAY OF OBSTACLES BY A BED-FITTED DEPTH-AVERAGED MODEL

Yang Su; Zhang Huiqin; Yu Wangxin; Cheng Pengda; Liu Qingquan; Wang Xiaoliang

doi:10.6052/0459-1879-21-200

Volume 53 Issue 12

Dec. 2021

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Chinese Journal of Theoretical and Applied Mechanics > 2021 > 53(12): 3399-3412. > DOI: 10.6052/0459-1879-21-200 CSTR: 32045.14.0459-1879-21-200

Yang Su, Zhang Huiqin, Yu Wangxin, Cheng Pengda, Liu Qingquan, Wang Xiaoliang. Numerical study of interaction between granular flow and an array of obstacles by a bed-fitted depth-averaged model. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(12): 3399-3412. DOI: 10.6052/0459-1879-21-200

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NUMERICAL STUDY OF INTERACTION BETWEEN GRANULAR FLOW AND AN ARRAY OF OBSTACLES BY A BED-FITTED DEPTH-AVERAGED MODEL

*.
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
†.
Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
**.
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: May 10, 2021
Accepted Date: October 18, 2021
Available Online: October 19, 2021

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Abstract

Abstract

The impact of granular flow such as debris flow and landslide, and how to design obstacles to deflect granular hazard, are becoming more and more important recently. In this study a bed-fitted depth-averaged model is established to simulate the interaction between granular flow and obstacles on steep terrains, which is able to simulate the birth and evolution of shock wave, reflection, bypass and runup during interaction between granular flow and obstacles on steep terrains. A series of numerical simulations concerning granular flows interacting with an array of tetrahedral obstacles of different distributions were conducted. A new dimensionless index called deflection efficiency was proposed, and the effects of tetrahedral obstacle arrays on the flow distance and lateral spreading characteristics of granular flow were quantitatively evaluated. A single tetrahedral obstacle plays a role of dissipation and deflection on granular flow, the latter of which even more obviously changes the granular flow pattern. An array of tetrahedral obstacles shows a comprehensive action of dissipation and deflection on granular flow, where multilevel actions dissipate energy in granular flow through bow shocks, and the splitting and changing actions on the flow path deflect granular flow. The obstacle system could control the final deposit to produce a protection region downstream.
- granular flow,
- hazard,
- obstacle array,
- interaction,
- dissipation,
- deflection

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References

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NUMERICAL STUDY OF INTERACTION BETWEEN GRANULAR FLOW AND AN ARRAY OF OBSTACLES BY A BED-FITTED DEPTH-AVERAGED MODEL

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NUMERICAL STUDY OF INTERACTION BETWEEN GRANULAR FLOW AND AN ARRAY OF OBSTACLES BY A BED-FITTED DEPTH-AVERAGED MODEL

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