| Numerical Investigation of the Impact of Different Configurations and Aspect Ratios on Dense Gas Dispersion in Urban Street Canyons |
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| 作者姓名： | 杨锐 张婧 申世飞 李晓萌 陈建国 |
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| 作者单位： | Center for Public Safety Research Department of Engineering Physics，Tsinghua University，Center for Public Safety Research，Department of Engineering Physics，Tsinghua University，Center for Public Safety Research，Department of Engineering Physics，Tsinghua University，Center for Public Safety Research，Department of Engineering Physics，Tsinghua University，Center for Public Safety Research，Department of Engineering Physics，Tsinghua University，Beijing 100084，China，Beijing 100084，China，Beijing 100084，China，Beijing 100084，China，Beijing 100084，China |
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| 摘 要： | The dispersion of chlorine gas in urban street canyons was numerically simulated using the fire dynamics simulator, a code developed by the National Institute of Standards and Technology of USA, which uses large eddy simulation coupled with the Smagorinsky sub-grid scale model. The unsteady flow fields were computed by solving the filtered incompressible Navier-Stokes equations under low Mach number ap-proximation by the finite difference method. The studies analyzed the influence of different street canyon configurations and aspect ratios on the flow and chlorine gas dispersion. The geometric configuration and aspect ratio both affect the vortices and the local concentration distributions in street canyons.
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| 关 键 词： | 峡谷 数字分析 分散性能 涡旋 |
| 收稿时间： | 2 June 2006 |
| 修稿时间： | 2006-06-022006-06-30 |
Numerical Investigation of the Impact of Different Configurations and Aspect Ratios on Dense Gas Dispersion in Urban Street Canyons |
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| Rui Yang, &#x; &#x;, Jing Zhang,
, Shifei Shen, &#x;Þ, Xiaomeng Li, &#x; ,Jianguo Chen, &#x;ý.Numerical Investigation of the Impact of Different Configurations and Aspect Ratios on Dense Gas Dispersion in Urban Street Canyons[J].Tsinghua Science and Technology,2007,12(3):345-351. |
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| Authors: | Rui Yang &#x; &#x; Jing Zhang
Shifei Shen &#x;Þ Xiaomeng Li &#x; Jianguo Chen &#x;ý |
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| Institution: | Center for Public Safety Research, Department of Engineering Physics, Tsinghua University, Beijing 100084, China |
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| Abstract: | The dispersion of chlorine gas in urban street canyons was numerically simulated using the fire dynamics simulator, a code developed by the National Institute of Standards and Technology of USA, which uses large eddy simulation coupled with the Smagorinsky sub-grid scale model. The unsteady flow fields were computed by solving the filtered incompressible Navier-Stokes equations under low Mach number ap-proximation by the finite difference method. The studies analyzed the influence of different street canyon configurations and aspect ratios on the flow and chlorine gas dispersion. The geometric configuration and aspect ratio both affect the vortices and the local concentration distributions in street canyons. |
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| Keywords: | dense gas street canyon dispersion large eddy simulation |
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