This is a numerical study of wind pressure loads on low rise buildings in which three different types of roofs were analyzed which are the flat, gable and circular roof at different wind speed. The numerical analysis was performed using FLUENT package based on values of k (turbulence kinetic energy) and (dissipation rate of turbulence) based on partial differential equation. Also, flat, and shallow escarpment terrains were considered during the simulation to determine the coefficient of pressure at different wind speed for different roof types. For the shallow escarpment terrain, a flat roof was considered at different velocities and for the flat terrain, three different types of roofs are considered which are the flat, gable and circular roof. It is observed that as the wind speed increases, the coefficient of drag decreases. It also shows the effect of vortex formed at the leeward direction of the building which implies the higher the wind speed, the larger the vortex formed and the lower the building ventilation and higher the damage on the roof of the building. Based on the analysis, it is preferable to use a circular roof based on the aerodynamic characteristics of wind around building walls and roofs.

翻译：本文对不同风速下平屋顶、双坡屋顶及圆形屋顶三种低层建筑的风压荷载进行了数值研究。基于偏微分方程确定的湍流动能k值及湍流耗散率ε值，采用FLUENT软件包完成了数值分析。此外，在模拟过程中同时考虑了平坦地形与浅陡坡地形，以确定不同屋顶类型在不同风速下的压力系数。针对浅陡坡地形，研究了不同风速下平屋顶的情况；而对平坦地形，则分别分析了平屋顶、双坡屋顶及圆形屋顶三种类型。结果表明：随风速增大，阻力系数呈递减趋势。研究同时揭示了建筑物背风侧涡旋形成的影响——风速越高，涡旋规模越大，导致建筑通风效果下降及屋顶损伤程度加剧。基于建筑物墙体及屋顶周围气动特性分析，建议优先采用圆形屋顶设计方案。