群体建筑风环境的三维数值模拟及分析

Three-dimensional Numerical Simulation And Analysis on Wind Environment of Group Buildings

针对城市建筑物分布对人类活动风环境评价困难问题,引入数值模拟方法。对某大学校园局部建筑物群建立三维分析模型,分别应用三维湍流κ-ε方程中Standard湍流模型、KNG湍流模型和Realizable湍流模型,计算了2m以下人类活动环境的风场,并与实际测量的建筑物风环境数值相比较,最终得到三种模型类型,均能满足工程计算精度要求;但相对而言,在建筑物拐角之处,由Realizable湍流模型计算出来的风场更能接近实际。

Aimed at the problem that city buildings distributions affect the evaluation of the wind environment which people live in, the numerical simulation method and established a three-dimensional model are introduced. Taking a local building group of certain university for example, Standard turbulent flow model, KNG turbulent flow model and Realizable turbulent flow model of three-dimensional κ-ε equation were respectively applied to calculate the environmental wind field of human activities under 2 meters high, which was compared with the real number of wind environment practically measured. Finally, the result is gotton that the three models satisfied engineering calculation requirement, but relatively, the result calculated from Realizable turbulent flow model suited reality better at the comer of a building.