基于沿程坐标积分模式颗粒流与结构物阵列相互作用的数值模拟
NUMERICAL STUDY OF INTERACTION BETWEEN GRANULAR FLOW AND AN ARRAY OF OBSTACLES BY A BED-FITTED DEPTH-AVERAGED MODEL
查看参考文献35篇
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文摘
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近年来,由颗粒物质流动主导的泥石流、滑坡等自然灾害评估及其防护工作越来越受到人们的关注.本文基于沿程坐标积分模式建立了陡峭地形条件结构物作用下颗粒流运动的数值模型,可以较为准确地表征陡峭地形情形结构物影响下颗粒流的流态特征和运动过程,尤其是相互作用过程中激波结构的形成与演化,颗粒流的反射、绕射和爬升等动力效应.通过数值模拟研究了颗粒流与不同分布密度四面体结构物阵列相互作用时的流态演化与堆积形貌,提出了新型偏转效率无量纲指标,结合流通效率,定量评估了四面体结构物阵列对颗粒流流通距离和侧向铺展特征的影响.结果表明,单个四面体结构物对颗粒流的作用包括耗散作用和偏转作用两种模式,其中偏转作用尤为显著;结构物阵列对颗粒流产生综合的耗散和偏转作用,通过多级作用形成系列的弓形激波耗散颗粒流能量,通过偏转作用分隔和改变颗粒流路径,增强耗散作用,调控堆积形态,可望对下游地区产生显著的防护效果. |
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其他语种文摘
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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. |
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来源
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力学学报
,2021,53(12):3399-3412 【核心库】
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DOI
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10.6052/0459-1879-21-200
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关键词
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颗粒流
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灾害
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结构物阵列
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相互作用
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耗散
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偏转
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地址
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1.
北京理工大学宇航学院, 北京, 100081
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中国科学院力学研究所, 北京, 100190
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中国科学院大学工程科学学院, 北京, 100049
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0459-1879 |
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学科
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力学;地质学;灾害及其防治 |
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基金
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国家自然科学基金
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国家重点研发项目
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北京理工大学青年教师学术启动计划资助
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文献收藏号
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CSCD:7139263
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参考文献 共
35
共2页
|
|
1.
夏添.
震区泥石流危害性评价及预警减灾系统研究.[博士论文],2013
|
被引
1
次
|
|
|
|
|
2.
Tang C. Triggering conditions and depositional characteristics of a disastrous debris flow event in Zhouqu city, Gansu province, northwestern China.
Natural Hazards and Earth System Sciences,2011,11(11):2903-2912
|
被引
33
次
|
|
|
|
|
3.
Pudasaini S P. A multi-phase mass flow model.
Journal of Geophysical Research-Earth Surface,2019,124(12):2920-2942
|
被引
4
次
|
|
|
|
|
4.
刘传正. 甘肃舟曲2010年8月8日特大山洪泥石流灾害的基本特征及成因.
地质通报,2010,30(1):141-150
|
被引
1
次
|
|
|
|
|
5.
赵志明. 四川茂县新磨村滑坡高速启动机理研究.
工程地质学报,2020:1-10
|
被引
2
次
|
|
|
|
|
6.
张睿骁.
滑坡碎屑流对防护结构的冲击效应及堆积特征研究.[硕士论文],2020
|
被引
1
次
|
|
|
|
|
7.
Domnik B. Full two-dimensional rapid chute flows of simple viscoplastic granular materials with a pressure-dependent dynamic slip-velocity and their numerical simulations.
Journal of Non-Newtonian Fluid Mechanics,2012,173:72-86
|
被引
6
次
|
|
|
|
|
8.
Domnik B. Coupling of full twodimensional and depth-averaged models for granular flows.
Journal of Non-Newtonian Fluid Mechanics,2013,201:56-68
|
被引
8
次
|
|
|
|
|
9.
Faug T. Depth-averaged analytic solutions for free-surface granular flows impacting rigid walls down inclines.
Physical Review E,2015,92(6):062310
|
被引
4
次
|
|
|
|
|
10.
Kattel P. Interaction of two-phase debris flow with obstacles.
Engineering Geology,2018,242:197-217
|
被引
8
次
|
|
|
|
|
11.
Pudasaini S P. Rapid flow of dry granular materials down inclined chutes impinging on rigid walls.
Physics of Fluids,2007,19(5):053302
|
被引
8
次
|
|
|
|
|
12.
Pudasaini S P. Shock waves in rapid flows of dense granular materials: theoretical predictions and experimental results.
Physical Review E,2008,78(4):041308
|
被引
4
次
|
|
|
|
|
13.
Teufelsbauer H. DEM simulation of impact force exerted by granular flow on rigid structures.
Acta Geotechnica,2011,6(3):119-133
|
被引
8
次
|
|
|
|
|
14.
Zhou G G D. Numerical study of granular debris flow run-up against slit dams by discrete element method.
Landslides,2020,17(3):585-595
|
被引
2
次
|
|
|
|
|
15.
Bi Y. Numerical analysis of effect of baffle configuration on impact force exerted from rock avalanches.
Landslides,2018,15(5):1029-1043
|
被引
1
次
|
|
|
|
|
16.
孙新坡. 崩塌体与拦石墙冲击动力演化过程及参数敏感性.
成都理工大学学报(自然科学版),2017,44(2):232-238
|
被引
6
次
|
|
|
|
|
17.
Dai Z. SPH model for fluid-structure interaction and its application to debris flow impact estimation.
Landslides,2017,14(3):917-928
|
被引
3
次
|
|
|
|
|
18.
Gray J M N T. Shock waves, dead zones and particle-free regions in rapid granular free-surface flows.
Journal of Fluids Mechanics,2003,491:161-181
|
被引
6
次
|
|
|
|
|
19.
Cui X. Gravity-driven granular free-surface flow around a circular cylinder.
Journal of Fluids Mechanics,2013,720:314-337
|
被引
3
次
|
|
|
|
|
20.
Juez C. 2D dry granular free-surface flow over complex topography with obstacles. Part II:Numerical predictions of fluid structures and benchmarking.
Computers & Geosciences,2014,73:142-163
|
被引
1
次
|
|
|
|
|
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