In this study, the effects of high-rise building on the flow and pollutant dispersion under different temperature stratification conditions were simulated using the Reynolds Averaged Navier Stokes (RANS) method and standard k-ε turbulence model. The results showed the following: Both the height of central building and temperature stratification significantly affect the airflow around building arrays. When the height of the central building is 0H (H is the height of surrounding buildings), the flow structure under the different temperature stratification conditions are invariably wake interference flows in morphology but are markedly different in terms of the vortex morphology and quantity. When the height of the central building is 2H, the central building has marked blocking effect, increasing the complexity of the flow fields in the surrounding blocks, the length of the recirculation zones of downstream buildings, and the range of pollutant dispersion, particularly under stable conditions. Increasing the central building height to 2H markedly decreases the turbulent kinetic energy in downstream street canyons due to the effect of the recirculation zones of the central building. Under non-neutral conditions, increasing the central building height to 2H intensifies the mechanical turbulence, resulting in nonsignificant temperature stratification variations in the building arrays.

在这项研究中，使用雷诺平均Navier斯托克斯（RANS）方法和标准k-ε湍流模型模拟了高层建筑在不同温度分层条件下对流量和污染物扩散的影响。结果表明：中央建筑物的高度和温度分层均显着影响建筑物阵列周围的气流。当中心建筑物的高度为0 H（H为周围建筑物的高度）时，在不同温度分层条件下的流动结构在形态上始终是尾流干扰流，但在涡流形态和数量方面却明显不同。当中央建筑物的高度为2 H特别是在稳定条件下，中央建筑物具有显着的阻塞作用，增加了周围街区的流场的复杂性，下游建筑物再循环区的长度以及污染物扩散的范围。由于中央建筑物的再循环区域的影响，将中央建筑物的高度增加到2 H可以显着减少下游街道峡谷中的湍动能。在非中性条件下，将建筑物的中央高度增加到2 H会加剧机械紊流，从而导致建筑物阵列中的温度分层变化不明显。