Numerical Simulations of Boundary-Layer Airflow Over Pitched-Roof Buildings
Numerical Simulations of Boundary-Layer Airflow Over Pitched-Roof Buildings
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斜屋顶建筑边界层气流的数值模拟
DOI：
10.1007/s10546-022-00738-1
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发表时间：
2022
影响因子：
4.3
通讯作者：
Coburn M
中科院分区：
文献类型：
--
作者：
Coburn M
倾斜屋顶的建筑阵列在欧洲城市的城市和郊区很常见。为了更好地了解坡屋顶对城市边界层的影响，采用大涡模拟的方法对平顶和坡屋顶长方体的边界层流动进行了预测。该仿真方法在平顶长方体阵列上得到了验证。进一步的模拟表明，网格整合类型的改变对平均流场和湍流应力的影响可以忽略不计，而对于给定的堆积密度，对色散应力有明显但很小的影响。在堆积密度分别为16.7%和33.3%的情况下，对平顶长方体阵列和坡屋顶长方体阵列进行了比较。坡屋顶建筑之间的相互作用及其对城市边界层的影响与平顶建筑有很大的不同。当堆积密度为33.3%时，坡屋顶的平均流场、雷诺应力和气动阻力都发生了显著变化。进一步研究了湍流水平的变化和大气热力层结在接近气流中的影响。与平顶排布相比，堆积密度为33.3%的斜顶排布明显提高了摩擦速度，大大降低了稳定层结条件和来流湍流度变化的影响。
Arrays of buildings with pitched roofs are common in urban and suburban areas of European cities. Large-eddy simulations are performed to predict the boundary-layer flows over flat and pitched-roof cuboids to gain a greater understanding of the impact of pitched roofs on urban boundary layers. The simulation methodology is validated for an array of flat roof cuboids. Further simulations show that changes in the type of grid conformity have a negligible effect on the mean flow field and turbulent stresses, while having a visible, but small, effect on the dispersive stresses for a given packing density. Comparisons are made for flat andpitched roof cuboid arrays at packing densities of 16.7% and 33.3%. The interactions between pitched-roof buildings and their effect on the urban boundary layer are considerably different to those of flat-roof buildings. The pitched roofs at a packing density of 33.3% leads to significant changes in the mean flow field, the Reynolds stresses, and the aerodynamic drag. Further work investigates the effects of changes in turbulence level and atmospheric thermal stratification in the approaching flow. Importantly, in comparison to a flat-roof array, the pitched-roof one at a packing density of 33.3% evidently increase the friction velocity and greatly reduces the effects of stable stratification conditions and changes in inflow turbulence level.
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