超高层建筑风效应的流固耦合CFD模拟

CFD simulation of fluid solid interaction of wind effects on super high-rise buildings

以300 m级利通广场为研究对象,基于ANSYS平台,建立建筑的壳单元气弹模型,输入合理流场信息,对结构风振响应和流场特性进行分析。研究表明,气流在结构前缘发生分离,屋顶斜坡处气流发生再附,结构后方形成湍流度较强的尾流区,结构迎风面上正风压随高度而增大,结构背风面和侧面因处于尾流区而呈现负压;结构不同高度处出现涡源,随平均风输送而远离结构表面;结构顶部的顺风向和横风向响应与风洞试验结果接近。

With 300 m high Litong Plaza as the study object and based on the platform of ANSYS, shell unit aeroelastic model of the building is established, suitable flow field information is input to analyze the wind-induced structural response and flow field characteristics. Studies show that flow separates at the front edge of the building, and reattaches on the slope of rooftop, forming strong turbulence wake zone at the back of the building. Positive wind pressure on the windward surface increases with structural height, while negative pressure exists at leeward surface and side sur- face owing to their position in wake zone. Vortex source appears at different height of the building, which is transported away from structural surface with mean wind veloci- ty. Along-wind and cross-wind responses on the top of the building are close to results of wind tunnel tests.