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| 建筑高度对建筑群行人高度处的风场及污染物扩散影响的数值模拟 |
| Numerical simulation on the impact of building height on wind field and pollutants diffusion at pedestrian level in a building group |
| 投稿时间：2022-09-26 |
| DOI：10.13259/j.cnki.eri.2023.03.002 |
| 中文关键词: 建筑高度|数值模拟|行人高度|风场|浓度场 |
| 英文关键词:building height|numerical simulation|pedestrian level|wind field|concentration field |
| 基金项目: |
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| 摘要点击次数: 101 |
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| 中文摘要: |
| 选取规则的高层建筑群，数值模拟了7种建筑高度布排下目标域内行人高度处的风场和污染物浓度场。建筑高度对风场和污染物浓度场有显著的影响，当域内建筑与周围建筑高度相同时，行人高度处的风速较小而污染物浓度在所有工况中最大；当域内建筑高度采用渐次或交错变化的布排方式且至少有1排建筑高度是周围建筑的2倍时，行人高度处的风速明显增强而污染物浓度变小；在域内建筑高度渐次增加的工况下，地面附近风速均匀且最强而污染物浓度最低。行人高度处的主流方向大多与来流方向一致或相反，与来流垂直方向的流动相对较弱。对流情况基本决定了污染物的分布特点，受地面回流和污染源位置的影响， 7种工况下污染物浓度均较低。 |
| 英文摘要: |
| In a regular high-rise building group, wind field and pollutants diffusion at pedestrian level were numerically simulated in seven cases of building height arrangements. Building height has significant impact on wind field and pollutants concentration field. When the building height in the target region was equal to that of the surroundings, the wind velocity at pedestrian level is small, while the largest pollutants concentration is observed in all cases. In the cases of progressive or staggered increase of building height, the wind velocity accelerates obviously, and the pollutants concentration decreases when one row’s height in the target region at least is twice of that in the surroundings. The increasing building height results in the uniform and largest wind velocity at pedestrian level, while the smallest pollutants concentration is achieved. The mainstream in the target region run primarily in the same or opposite direction as the incoming flow, while the perpendicular flow appears weak. The convection dominates the pollutants distribution. The pollutants concentration in all cases keeps at low level due to the backflow near the ground and the location of pollutant sources. |
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