【摘要】 文中旨在研究大跨度拱形屋盖在不同风向角条件下的积雪分布特性，为结构抗雪设计提供依据。研究基于EulerEuler方法及风雪单向耦合假设，采用Mixture多相流模型与k-kl-ω湍流模型，结合用户自定义函数（User-Defined Functions,UDF）嵌入入口边界与积雪面函数，实现了三维积雪漂移数值模拟，系统分析了0°～90°风向角范围内屋面雪荷载的分布规律。结果表明在0°～30°风向角下，壁面摩擦速度最低为0.4，积雪逐渐向右下侧堆积；当风向角为45°时，屋面中心区域约62%面积的无量纲摩擦速度达到最大值2；随着风向角增至60°～90°，屋面中心高摩擦速度区域缩小43%，背风面边缘低摩擦速度区域扩大64%，壁面摩擦速度最大值由2.0降至1.4，降幅达30%。研究表明风向角对拱形屋面积雪分布具有显著影响，45°为最不利工况。更多还原

【Abstract】 This study aims to investigate the snow accumulation characteristics of large-span arched roofs under different wind direction angles, providing a basis for structural snow-resistant design. Based on the Euler-Euler method and the assumption of one-way wind-snow coupling, a Mixture multiphase flow model and the k-kl-ω turbulence model were adopted. By embedding user-defined functions(UDF) into the inlet boundary and snow surface functions, a three-dimensional numerical simulation of snow drifting was realized. The distribution pattern of roof snow loads was systematically analyzed within the wind direction angle range of 0°～90°. The results show that at wind direction angles of 0°～30°, the minimum wall friction velocity is 0.4, and snow gradually accumulates toward the lower right side. When the wind direction angle is 45°, approximately 62% of the roof’s central area reaches the maximum dimensionless friction velocity of 2. As the wind direction angle increases to 60°～90°, the high-friction velocity region in the roof center decreases by 43%, while the low-friction velocity region at the leeward edge expands by 64%.Meanwhile, the maximum wall friction velocity decreases from 2.0 to 1.4, representing a 30% reduction. The study indicates that wind direction angle has a significant influence on the snow distribution of arched roofs, with 45° being the most unfavorable condition.更多还原