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防风网扬尘庇护区湍流流场模拟数值边界条件研究
Study on the numerical boundary conditions for simulation of turbulent flows in the shielding zone after windbreaks
投稿时间:2018-06-11  修订日期:2018-07-08
DOI:
中文关键词:  防风网  数值风洞  湍流  数值模拟  边界条件
英文关键词:Windbreak  numerical wind tunnel  turbulent flow  numerical simulation  boundary condition
基金项目:国家自然科学基金,国家重点实验室
作者单位E-mail
许栋 天津大学 xudong@tju.edu.cn 
张博曦 天津大学 1548956684@qq.com 
杨海滔 天津大学  
及春宁 天津大学 cnji@tju.edu.cn 
季则舟 中交第一航务工程勘察设计院  
张志强 格瑞(天津)科技发展有限公司 44768078@qq.com 
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中文摘要:
      防风网后方存在复杂的湍流结构,通过耗散能量、降低风速形成扬尘庇护区。数值风洞是研究防风网流场结构及预测堆场扬尘的重要方法,由于涉及复杂的大气边界层及多孔介质边界问题,建立高精度的数值风洞目前仍是计算流体的难题。本文通过一系列数值模拟并与物理实验对比分析,研究了影响防风网数值风洞模拟精度的三个边界条件,即紊流入流边界、地面粗糙边界和多孔介质边界。结果表明:计算域入流紊动强度对风场结构模拟结果具有较大影响,紊动不足能够造成高达50%以上的虚假庇护长度;地面粗糙高度通过壁面律影响流场结构,对防风网抑尘效应有较大影响;防风网阻风效果可利用多孔跳跃介质边界模型实现,模型中惯性阻力系数对模拟结果有较大影响,应根据风压损失系数、防风网厚度和雷诺数设定。
英文摘要:
      There is complex turbulence structure behind the windbreak, by dissipating energy, it reduces wind speed to form dust refuge. The numerical wind tunnel is an important method to study the flow field structure of the windbreak and predict the dust in the yard. Due to the complex atmospheric boundary and porous boundary conditions, the establishment of high-precision numerical wind tunnels is still a computational fluid challenge. Through a series of numerical simulations and comparison with physical experiments, three boundary conditions that affect wind tunnel numerical wind tunnel simulation accuracy are studied, that is, turbulent inflow boundary, rough surface boundary and porous media boundary. The results show that the turbulence intensity of inflow in computational domain has a great influence on the simulation results of wind farm structure. The lack of turbulence can lead to a false refuge length of up to 50%. The roughness height affects the structure of flow field through the wall law, which has a great influence on the dust suppression effect of the windbreak. The wind blocking effect of the windbreak can be simulated by using the porous jumping medium boundary model. The inertial resistance factor in the model has a great influence on the simulation results, and it should be set according to the wind pressure loss coefficient, windbreak thickness and Reynolds number.
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