运用ANSYS Fluent软件并引入Renormalizationgroup k-ε湍流模型，以北京天安门城楼复杂形体为对象，数值计算分析重檐歇山顶式古建筑的风压与风场特性，揭示了不同风向角下建筑风压与风场的变化规律，开展了城楼城台封闭和城台开敞、曲面斜坡屋面和直线斜坡屋面等对建筑风压和风场的影响.研究表明，风向角对建筑屋面和重檐风压分布影响显著；城台开敞可降低建筑周围整体气流流速，减小屋面和重檐的负风压；直线斜坡可降低屋面与重檐处气流速度，但将增大重檐间区域的气流速度.给出了无周边遮挡建筑物情况下重檐歇山顶古建筑的风荷载体型系数，可为此类古建筑的抗风设计提供技术参考.
Taking Beijing Tiananmen as an object, wind pressure and wind field around ancient buildings of tower style with multipleeave and doublepitch roof are simulated numerically by using software ANSYS Fluent and Renormalizationgroup k-ε turbulence model. The laws of wind pressure and wind field of the buildings under different wind directions are investigated. Then the influences of key parameters are indicated, including the close or open platform as well as curvature slope or linear slope of roof. The results show that wind direction has a great influence on the wind pressure of roof and double eaves. In the case of open platform, the velocity of air flow around the building reduces while negative wind pressure on the roof and double eaves decreases. Linear slope can reduce the air flow velocity at roof and double eaves and it increases the air flow velocity between double eaves. After wind pressure on the building without surrounding barrier is analyzed, wind load shape coefficients for the windresistance design of this kind of the ancient buildings are recommended.
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