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基于计算流体力学软件Fluent6.3,首先,选用基于Reynolds时均的标准k-ε等湍流模型对大气边界层中TTU标模的低层建筑三维定常风流场进行模拟分析,并将数值模拟结果与场地实测数据和TJ-2风洞试验结果进行了比较分析;其次,采用RNGk-ε模型分析了不同风向角下,房屋屋面坡度、挑檐长度、檐口高度和长宽比对低层双坡房屋屋面风压系数及各表面体型系数的影响。结果表明:数值模拟较好地反映了低层建筑周围风环境的绕流特性和表面风压的分布情况;迎风墙面均受有正压力,其体型系数受房屋几何尺寸的影响较小,房屋的背风面均承受负压力;屋面坡度及檐口高度对屋面风压分布及风压大小均有明显的影响,挑檐长度的影响较小;屋面的平均风压系数分布和大小与风的来流方向有关。该结论为低层房屋的工程抗风设计提供了依据。
Based on computational fluid dynamics software Fluent6.3, firstly, the standard three-dimensional steady-state wind flow field of low-rise buildings in the boundary layer of the atmospheric boundary layer is simulated by the standard k-ε turbulence model based on the Reynolds average time. The numerical simulation results are compared with the field Secondly, the RNGk-ε model is used to analyze the effect of roof slope, length of cornices, cornice height and aspect ratio on the roof winds of low-rise double-slope houses under different wind direction angles Pressure coefficient and the impact of body surface coefficient. The results show that the numerical simulation better reflects the wind flow characteristics and the distribution of surface wind pressure around the low-rise buildings. The windward walls are subject to positive pressure, the body coefficient is less affected by the geometric dimensions of the houses, The leeward surface is subject to negative pressure; roof gradient and cornice height have obvious effect on the wind pressure distribution and wind pressure, and the influence of the length of the cornice is small; the distribution and size of the average wind pressure coefficient and the flow direction of the wind related. This conclusion provides the basis for wind-resistant design of low-rise houses.