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首页> 外文期刊>Building and Environment >Side ratio effects on flow and pollutant dispersion around an isolated high-rise building in a turbulent boundary layer
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Side ratio effects on flow and pollutant dispersion around an isolated high-rise building in a turbulent boundary layer

机译：湍流边界层中孤立高层建筑物周围流动和污染物分散的副比率

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Large-eddy simulations were performed to investigate side ratio (SR) effects on flow and dispersion around an isolated high-rise building. Four cross sections were considered with SR ranging from 0.25 to 1.5. Three pollutants were released from the ground; the first source (P-1) was upwind of the building, and the other two (P(2 )and P-3) were downwind. Reattachments on the side and top surfaces were observed for SR = 1.5. As SR decreased, the recirculation area behind the building increased and vortex shedding strengthened. The dispersion area of pollutant P-1 nearly coincided with the primary separation region at ground level because its source location was inside the primary separation region. More of pollutant P-2 accumulated near the leeward wall because the discharge hole was located inside the recirculation region behind the building for all simulations, and large SR values had high P-2 concentrations because of the weak vortex shedding strength. Pollutant P-3 (whose source was far from the building) exhibited different distribution patterns because of different recirculation sizes; it was blown directly downstream for SR = 1.5 and 1.0, whereas more was transported back toward the leeward wall for SR = 0.25. An analysis of the probability density functions of instantaneous concentration indicated that positive fluctuations of the concentration occurred more frequently near source locations; the opposite held in relatively low-concentration areas. The extremely high positive fluctuations reached 15 times the standard deviation for the second mode.
机译：进行大涡模拟以研究孤立的高层建筑物周围的侧比（SR）对流动和分散的影响。使用0.25至1.5的SR考虑四个横截面。从地面释放了三个污染物;第一源（P-1）是建筑物的逆向，另外两个（P（2）和P-3）逆风。对于SR = 1.5，观察到侧面和顶表面上的重新分散。随着SR减少，建筑物背后的再循环面积增加和涡旋流动加强了。污染物P-1的分散区域几乎与地层的初级分离区域一致，因为其源位置位于初级分离区域内。更多污染物P-2累积在背风墙附近，因为排出孔位于建筑物后面的循环区域内，因为涡流脱落强度较弱，大的SR值具有高的P-2浓度。由于不同的再循环尺寸，污染物P-3（其源远离建筑物远离建筑物）表现出不同的分布模式;它直接吹入SR = 1.5和1.0的下游，而更多被运送回到SR = 0.25的背风壁。瞬时浓度概率密度函数的分析表明浓度的正波动更频繁地发生在源位置附近;在相对低浓度的区域保持相对。极高的正波动达到第二种模式标准偏差的15倍。

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