干旱区生态环境知识资源中心(Arid): 风沙环境中公路风沙灾害的数值模拟

Arid

	风沙环境中公路风沙灾害的数值模拟
其他题名	Numerical Simulation of Sand Transport around the Highway in Sandy Desert Area
	谢虎雄 1; 马发跃 2; 武生智 2
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2019
卷号	39 期号:2 页码:151-157
中文摘要	为揭示沙漠公路两侧风沙流场的空间分布特性,采用欧拉-拉格朗日方法,把气流作为连续介质,把沙粒作为离散体系,利用ANSYS标准k-epsilon湍流模型和DPM离散相模型,模拟了不同沙粒粒径(150、200、250、300、 350 mum)、不同摩阻风速(0.20、0.35、0.50、0.65、0.80 m·s~(-1))、不同挡风墙高度(1.0、1.5、2.0、2.5、3.0 m)以及不同挡风墙开孔情况下的公路路基附近的沙粒跃移运动,统计了挡风墙前后的沙粒数目,给出了公路路基坡脚和坡顶等典型断面上的气流速度廓线。结果表明:气流通过挡风墙顶部时受压加速,有利于沙粒的输送,而在挡风墙前部气流遇阻减速,形成沙粒堆积。随着沙粒粒径的变大,沙粒跃过挡风墙的能力逐渐变低;随着摩阻风速的变大,气流输运能力增强,更多沙粒越过挡风墙;随着挡风墙高度的增加,阻挡沙粒数亦逐渐增多;挡风墙开孔的位置和大小亦影响着沙粒的运动。这表明离散相模型对复杂下垫面风沙跃移运动的计算具有良好的效果。
英文摘要	The objective of this study is to identify and describe wind-blown sand motion near and around the highway in sandy desert areas. The Euler-Lagrange approach was used to describe a coupled gas-solid two-phase flow. The air flow was treated as a continuous phase flow by solving the time-averaged Navier-Stokes equations,while the discrete sand particle motion was calculated based on the mean continuous flow field. We conducted a series of numerical simulations with different parameters by using ANSYS k-epsilon model and Discrete Particle Model. The sand particle diameters range from 150 mum,to 200 mum,250 mum,300 mum,350 mum,the friction velocity of air flow are from 0.20 m ·s~(-1),to 0.35 m·s~(-1),0.50 m·s~(-1),0.65 m·s~(-1),0.80 m·s~(-1),the height of retaining wall are from 1.0 m,to 1.5 m,2.0 m,2.5 m,to 3.0 m,and a variety of retaining walls with different openings are considered as well. The sand particles passing the retaining wall were counted statistically,the typical wind velocity profiles were depicted in this paper. The numerical results show that the flow speeds up at the top of the retaining wall,which is positive to transport of particles,while the flow slows down in the front of the retaining wall and between the wall and the roadbed, which leads to the sand deposition near these zones. As the sand particle becomes larger,the ability of sand particles over the retaining wall becomes lower; with the friction velocity being larger,block effect of windbreak of sand decreases; and with increasing of the retaining wall height,the sand amount over the wall will reduce; meanwhile, the opening position and size of the retaining wall play an important role on the sand movement near the highway. It is concluded that the discrete particle model is useful to the calculation of sand saltation in air,and can provide some theoretical support for the control of windblown sand and for the safe running and operation of highway in sandy desert areas.
中文关键词	沙漠公路 ; 风沙运动 ; 挡风墙 ; 离散相模型 ; 计算流体动力学
英文关键词	desert highway wind-blown sand movement retaining wall discrete particle model computational fluid dynamics
语种	中文
国家	中国
收录类别	CSCD
WOS类目	TRANSPORTATION
WOS研究方向	Transportation
CSCD记录号	CSCD:6460476
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/239776
作者单位	1.中铁二十一局集团有限公司第四工程有限公司, 西宁, 青海 810000, 中国; 2.兰州大学/土木工程与力学学院, 西部灾害与环境力学教育部重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	谢虎雄,马发跃,武生智. 风沙环境中公路风沙灾害的数值模拟[J]. 兰州大学,2019,39(2):151-157.
APA	谢虎雄,马发跃,&武生智.(2019).风沙环境中公路风沙灾害的数值模拟.中国沙漠,39(2),151-157.
MLA	谢虎雄,et al."风沙环境中公路风沙灾害的数值模拟".中国沙漠 39.2(2019):151-157.