Large Eddy Simulation of Flow Field Characteristics on Lee of a Small Scale Barchan Dune

doi:10.7652/xjtuxb201307021

您当前的位置：

首页 >

文章列表页 >

Large Eddy Simulation of Flow Field Characteristics on Lee of a Small Scale Barchan Dune

更新时间：2025-07-09

- Large Eddy Simulation of Flow Field Characteristics on Lee of a Small Scale Barchan Dune
- Vol. 47, Issue 7, Pages: 114-119(2013)
- 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：
- DOI：10.7652/xjtuxb201307021
  CLC： X169;O359
- Online First：10 July 2013，
  
  Published：2013
- 稿件说明：
移动端阅览
Large Eddy Simulation of Flow Field Characteristics on Lee of a Small Scale Barchan Dune[J]. 2013, 47(7): 114-119.
DOI：

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.

关键词

Keywords

references

WALKER I J, NICKLING W G. Dynamics of secondary airflow and sediment transport over and in the lee of transverse dunes [J]. Progress in Physical Geography, 2002, 26(1): 47-75.

WALKER I J. Secondary airflow and sediment transport in the lee of a reversing dune [J]. Earth Surface Processes and Landforms, 1999, 24: 437-448.

WALKER I J, NICKLING W G. Simulation and measurement of surface shear stress over isolated and closely spaced transverse dunes in a wind tunnel [J]. Earth Surface Processes and Landforms, 2003, 28: 1111-1124.

WIGGS G F S, LIVINGSTONE I, WARREN A. The role of streamline curvature in sand dune dynamics: Evidence from field and wind tunnel measurements [J]. Geomorphology, 1996, 17(1/2/3): 29-46.

钱广强, 董治宝. 横向沙丘背风侧气流重附风洞模拟 [J]. 中国沙漠, 2008, 28(1): 16-20.

QIAN Guangqiang, DONG Zhibao. Wind tunnel simulation on flow reattachment on lee of transverse dunes [J]. Journal of Desert Research, 2008, 28(1): 16-20.

QIAN Guangqiang, DONG Zhibao. Variations of horizontal and vertical velocities over two-dimensional transverse dunes: a wind tunnel simulation of the effect of windward slope [J]. Journal of Arid Environments, 2009, 73: 1109-1116.

DONG Zhibao, QIAN Guangqiang. Turbulence fields in the lee of two-dimensional transverse dunes simulated in a wind tunnel [J]. Earth Surface Processes and Landforms, 2009, 34: 204-216.

PARSONS D R, WIGGS G F S. Numerical modelling of airflow over an idealised transverse dune [J]. Environmental Modelling Software, 2004, 19: 153-162.

PARSONS D R, WALKER I J. Numerical modelling of flow structures over idealized transverse aeolian dunes of varying geometry [J]. Geomorphology, 2004, 59: 149-164.

SCHATZ V, HERRMANN H J. Flow separation in the lee side of transverse dunes: a numerical investigation [J]. Geomorphology, 2006, 81: 207-216.

江丽娟, 马高生. 新月形沙丘表面流场的数值模拟 [J]. 兰州大学学报, 2010, 46(1): 48-52.

JIANG Lijuan, MA Gaosheng. Numerical modeling of flow over an isolated barchan dune [J]. Journal of Lanzhou University, 2010, 46(1): 48-52.

蒋红, 佟鼎, 黄宁. 坡面地表下的风场的风洞实验与数值模拟 [J]. 中国沙漠, 2011, 31(3): 626-631.

JIANG Hong, TONG Ding, HUANG Ning. Numerical simulation and wind tunnel experiment of wind field over slope surface [J]. Journal of Desert Research, 2011, 31(3): 626-631.

PIOMELLI U, BALARAS E. Wall-layer models for large eddy simulations [J]. Annu Rev Fluid Mech, 2002, 34: 349-374.

陶文铨. 计算传热学的近代进展 [M]. 北京: 科学出版社, 2000: 246.

LI Z Y, TAO W Q. A new stability-guaranteed second order difference scheme [J]. Numerical Heat Transfer: Part B, 2002, 42(4): 349-365.

ORELLANO A, WENGLE H. Numerical simulation(DNS and LES)of manipulated turbulent boundary layer flow over a surface-mounted fence [J]. European Journal of Mechanics B: Fluids, 2000, 19: 765-788.

凌裕泉, 吴正. 新月形沙丘形态的模拟实验研究 [J]. 地理科学, 1998, 18(1): 88-93.

LING Yuquan, WU Zheng. Simulated study on barchan dune forms [J]. Scientia Geographica Sinica, 1998, 18(1): 88-93.

陈懋章. 粘性流体动力学基础 [M]. 北京: 高等教育出版社, 2002: 244.

Views

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Effect of CO2 Addition on Explosion and Combustion Characteristics of Hydrogen-Air Turbulent Mixtures in Confined Spaces

Large Eddy Simulation of Flow Resistance and Heat Transfer Characteristics of Dual-Swirl Cooling on Turbine Blade Leading Edge

Research on the Thermal Mixing Mechanism of Fluids in a Circular T-Junction under Multi-Force Field Coupling Conditions

Large Eddy Simulation of Turbulent Flow and Heat Transfer in a Square Duct with Rayleigh-Benard Convection on the Cross Section

A Structure-Semantics-Residual Collaborative Image Compression Framework：Towards Privacy Protection and High-Fidelity Reconstruction

Related Author

HUANG Zuohua

LIU Hu

CAO Xun

WANG Jing

LI Qianqian

YANG Yilan

LIU Xuebin

SONG Liming

Related Institution

State key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

School of Energy and Power Engineering, Xi'an Jiaotong University

State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University

MOE Key Laboratory of Thermal Fluid Science and Engineering, Xi'an Jiaotong University

Faculty of Infrastructure Engineering, Dalian University of Technology

⁰