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Numerical Analysis of Solar Radiation Effects on Flow Patterns in Street Canyons

机译：太阳辐射对街道峡谷流型影响的数值分析

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AbstractA three dimensional computational fluid dynamics (CFD) model based on the Reynolds-averaged Navier-Stokes equations with the standard k-? turbulence scheme is applied to simulate the influence of thermal effects on air flow pattern, pressure distribution and air exchange in a regular street canyon with different thermal conditions and different background wind speeds. The results show that the thermal conditions can greatly affect the flow patterns inside the street canyon, and an impact factor w is defined to discuss the influence of thermal conditions on the static pressure distribution around the buildings. The value of w decreases with the increase of the wind speed for both upwind and downwind buildings. When the wind speed reaches a critical value (i.e., Vc), the influence of thermal effects on the pressure distributions near the buildings can be ignored. The air exchange rate in the canyon remains unchanged when the wind speed is above Vc.
机译：摘要基于具有标准k-？值的雷诺平均Navier-Stokes方程的三维计算流体动力学（CFD）模型。湍流方案被用来模拟热效应对具有不同热条件和不同背景风速的常规街道峡谷中气流模式，压力分布和空气交换的影响。结果表明，热条件可以极大地影响街道峡谷内部的流动模式，并定义影响因子w来讨论热条件对建筑物周围静压分布的影响。对于上风和下风建筑物，w的值随风速的增加而减小。当风速达到临界值（即Vc）时，可以忽略热效应对建筑物附近压力分布的影响。当风速高于Vc时，峡谷中的空气交换率保持不变。

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