干旱区研究

干旱区研究 ›› 2016, Vol. 33 ›› Issue (3): 672-680.doi: 10.13866/j.azr.2016.03.30

• 生态与环境 • 上一篇    

来流廓线对风沙流场和风沙堆积影响的数值模拟——以挡沙墙为例

辛国伟1, 程建军1, 景文宏1, 张芳2, 王连1, 智凌岩1   

  1. 1.石河子大学水利建筑工程学院,新疆 石河子 832003;
    2.中铁西北科学研究院有限公司,甘肃 兰州 730000
  • 收稿日期:2015-07-01 修回日期:2015-12-25 出版日期:2016-05-15 发布日期:2016-05-31
  • 作者简介:辛国伟(1990-),男,硕士研究生,研究方向沙害防治工程. E-mail: 942974011@qq.com
  • 基金资助:
    国家自然科学基金项目(51568057,51268050,50908152)资助

Numerical Simulation of the Influence of Incoming Flow Profile on Sand Flow Field and Aeolian Sand Deposition: A Case Study around Sand Retaining Wall

XIN Guo-wei1, CHENG Jian-jun1, JING Wen-hong1, ZHANG Fang2, WANG Lian1, ZHI Ling-yan1   

  1. 1. College of Water Resources and Architectural Engineering,Shihezi University,Shihezi 832003,Xinjiang,China;
    2. Northwest Research Institute Co. Ltd,China Railway Engineering Corporation,Lanzhou 730000,Gamsu,China
  • Received:2015-07-01 Revised:2015-12-25 Published:2016-05-15 Online:2016-05-31

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摘要： 来流风速廓线是控制与影响风沙流场变化的关键因素。基于CFD欧拉非定常模型,通过对不同来流廓线形式在特定粗糙度下垫面的数值分析,探究来流廓线对流场风速与积沙形态的影响。结果表明:2种来流廓线形式均在挡沙墙周围形成速度分区。其中,在背风侧,均匀流时回流区不明显,对数流时则回流区较明显;在迎风侧,均匀流时速度发生突变,对数流时则呈对数规律递增;不同来流形式下挡沙墙积沙分布不同,均匀流时只在背风侧形成积沙,而对数流时两侧均有积沙,且迎风侧积沙多于背风侧,来流速度越大,迎风侧积沙减小,而背风侧增多。

关键词: 来流廓线形式, 风速, 风沙堆积, 挡沙墙, 数值模拟

Abstract: Incoming flow velocity profile is a key factor for controlling and influencing the sand flow field. Based on CFD unsteady model,in this study a numerical analysis of different incoming flow profile forms under specific roughness of underlying surface was carried out so as to explore the influence of incoming flow profile on wind speed and sand deposition. The results showed that the velocity partition of two incoming flow profile forms formed around the sand retaining wall. On the leeward side,the recirculation zone of uniform flow was not obvious,but that of logarithmic flow. On the windward side,a sudden velocity change of the uniform flow occurred,but the velocity of logarithmic flow was increased in a logarithmic law. The distribution of sand deposition around sand retaining wall under different incoming flow forms was different: sand deposition of uniform flow occurred only on the leeward side,but that of logarithmic flow occurred on both sides,and it was more serious on the windward side than on the leeward side. Sand deposition on the windward side was reduced but increased on the leeward side with the increase of incoming flow speed.

Key words: incoming flow profile form, wind velocity, aeolian sand deposition, sand retaining wall, numerical simulation