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建筑扰动条件下大气流动与扩散的CFD模拟

李沁怡 蔡旭晖 康 凌

李沁怡, 蔡旭晖, 康 凌. 建筑扰动条件下大气流动与扩散的CFD模拟[J]. 环境科学研究, 2013, 26(8): 829-837.
引用本文: 李沁怡, 蔡旭晖, 康 凌. 建筑扰动条件下大气流动与扩散的CFD模拟[J]. 环境科学研究, 2013, 26(8): 829-837.
LI Qin-yi, CAI Xu-hui, KANG Ling. CFD Simulations of Flow and Dispersion under Construction Disturbance Conditions[J]. Research of Environmental Sciences, 2013, 26(8): 829-837.
Citation: LI Qin-yi, CAI Xu-hui, KANG Ling. CFD Simulations of Flow and Dispersion under Construction Disturbance Conditions[J]. Research of Environmental Sciences, 2013, 26(8): 829-837.

建筑扰动条件下大气流动与扩散的CFD模拟

基金项目: 国家重点基础研究发展计划(973)项目(2010CB428501);国家自然科学基金创新群体基金项目(41121004)

CFD Simulations of Flow and Dispersion under Construction Disturbance Conditions

  • 摘要: 用FLUENT模式对中性大气、单个建筑的气流扰动情况进行模拟,并以风洞试验数据检验模拟效果;将模拟方法应用于类似城市建筑阵列条件的大气污染扩散问题,并且与现场示踪试验比较. 结果表明:FLUENT对建筑扰动条件的平均风场模拟效果良好,FAC2(模拟值与试验值之比在0.5~2之间的比例)在水平与垂直风速下分别达到77.9%与61.0%;对湍流特征量的模拟偏差稍大,K(湍流动能)虽总体偏小,但FAC2仍达到了54.6%. 选择湍流闭合的标准K-ε(ε为湍流动能耗散率)方案、重整化群K-ε方案和雷诺应力模型方案对结果的影响均不大. 采用FLUENT模拟了类似城市街区建筑阵列条件的大气扩散个例, 模拟结果反映了建筑扰动导致的扩散烟流轴线相对于平均风向的非常规偏移,并且扩散浓度与示踪试验结果相符较好,下风向32与63m处的侧向模拟浓度峰值的相对误差分别为72.5%与36.9%. 相比于高斯模式ISC3,FLUENT对复杂建筑阵列条件的扩散模拟结果更符合实际,如污染物向上风向扩散以及在建筑物周围堆积与绕流的现象. FLUENT扩散模拟还显示:近源处相邻建筑街道峡谷中的最大浓度沿下风向“阶跃”式减小,排放源所在街道峡谷中的最大浓度可比相邻街谷中的高几倍甚至1个数量级以上.

     

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出版历程
  • 收稿日期:  2013-01-17
  • 修回日期:  2013-05-17
  • 刊出日期:  2013-08-25

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