小尺度新月形沙丘背风侧流场特性的大涡模拟分析

周晓斯; 王元; 李志强

doi:10.7652/xjtuxb201307021

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小尺度新月形沙丘背风侧流场特性的大涡模拟分析

更新时间：2025-07-09

- 小尺度新月形沙丘背风侧流场特性的大涡模拟分析
- Large Eddy Simulation of Flow Field Characteristics on Lee of a Small Scale Barchan Dune
- 西安交通大学学报 2013年47卷第7期页码：114-119
- 作者机构：
  
  西安交通大学流体机械及工程系,西安,710049
- 作者简介：
- 基金信息：
  
  : 2012-07-30。作者简介: 周晓斯(1984—),男,博士生;王元(通信作者),男,教授,博士生导师。基金项目: 国家自然科学基金资助项目(10972176, 11272252
- DOI：10.7652/xjtuxb201307021
  中图分类号： X169;O359
- 网络首发：2013-07-10，
  
  纸质出版：2013
- 稿件说明：
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周晓斯, 王元, 李志强. 小尺度新月形沙丘背风侧流场特性的大涡模拟分析[J]. 西安交通大学学报, 2013,47(7):114-119.

Large Eddy Simulation of Flow Field Characteristics on Lee of a Small Scale Barchan Dune[J]. 2013, 47(7): 114-119.
周晓斯, 王元, 李志强. 小尺度新月形沙丘背风侧流场特性的大涡模拟分析[J]. 西安交通大学学报, 2013,47(7):114-119. DOI： 10.7652/xjtuxb201307021.

Large Eddy Simulation of Flow Field Characteristics on Lee of a Small Scale Barchan Dune[J]. 2013, 47(7): 114-119. DOI： 10.7652/xjtuxb201307021.

摘要

为了准确获得新月形沙丘背风侧湍流流场流动特性

采用基于Smagorinsky的亚格子尺度涡黏模型的大涡模拟(LES)方法

对简化了的实验缩比小尺度沙丘模型绕流气相流场进行了数值研究

模拟了相同来流风速、不同沙丘迎风坡度和高度下背风侧风场的湍流流动模式

获得了背风侧区域地表面摩擦系数分布

比较了回流区长度和湍流强度分布。模拟结果表明:LES方法能较好地揭示背风侧湍流流场特性; 流场重附距离随沙丘迎风坡度和高度的增加而增大; 背风侧回流区内湍流强度总体上比回流区外大

回流区内沙丘坡脚位置及重附点位置处湍流强度最大值出现在贴近地表附近

随沙丘高度的增加而增大; 回流区中部湍流强度最大值出现在回流区顶部

随沙丘高度的增加先增大后基本不变。

Abstract

The large eddy simulation(LES)on the gas flow field over a simplified experimental reduced-scale barchan dune model was performed with the Smagorinsky SGS model to obtain the turbulent flow field characteristics on lee of the barchan dune more accurately. The wind field turbulent flow modes on the lee with various stoss slope and height of the dune were studied at the same wind velocity. The surface friction coefficient distribution in the lee region was obtained. The length of the recirculation zone and turbulent intensity distribution were discussed. The results show that LES can reveal the lee turbulent flow field characteristics better. The flow field re-attachment distance increases with the stoss slope and the dune height. The turbulence intensity inside the recirculation zone is generally greater than that outside the recirculation zone. The maximum turbulence intensity at the location of lee toe and re-attachment occurs near the surface and increases with the dune height. The maximum turbulence intensity at the location of the central recirculation zone appears at the top of the recirculation zone and increases first and then remains unchanged with an increase in the dune height.

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references

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