基于大涡模拟的CAARC模型角区开槽气动优化研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (7) : 126-133.

论文

徐洲洋，罗凯文，杨易

作者信息 +

Aerodynamic optimization of corner slotting in CAARC model based on LES

XU Zhouyang, LUO Kaiwen, YANG Yi

Author information +

文章历史 +

摘要

超高层建筑属风敏感结构，对建筑外形进行适当气动优化可有效降低结构风荷载及风致响应。本文基于大涡模拟（LES）方法，采用作者团队建议的一种新的入口湍流生成方法——NSRFG方法，进行超高层建筑标准模型（CAARC）角区开槽的气动优化研究。首先进行了CAARC高层建筑标准模型绕流模拟，并将模拟结果与风洞试验结果对比，以验证NSRFG方法的适用性；然后以CAARC模型为基础，设计了4种开槽气动优化方案，通过LES模拟得到基底弯矩功率谱，以估算建筑顶部位移响应和顶部峰值加速度响应。结果对比显示：（1）对于矩形截面高层建筑标模，无论原型还是4种开槽气动优化方案，横风向脉动响应和峰值加速度响应整体比顺风向大（2）与全封闭原型相比，采取不同开槽方案均能降低顺风向和横风向风振响应，其中角区开槽对顺风向响应的优化效果最好，周向开槽对横风向响应的优化效果最好；（3）4种开槽方案对于横风向响应的优化效果明显优于顺风向，其中相对而言周向开槽优化效果相对最好，使横风向脉动位移响应和横风向峰值加速度响应分别降低28.4%、32.8%。因此，从减小矩形截面超高层建筑结构横风向响应角度考虑建议采用周向开槽方案。

Abstract

Super high-rise buildings are wind-sensitive structures, and appropriate aerodynamic optimization of building shape can effectively reduce the structural wind load and wind-induced response. Based on the large eddy simulation (LES) method, a new inflow turbulence generation - the NSRFG (Narrow band Synthesis Random Flow Generation) were used to investigate the effects of corner aerodynamic modification of the standard high-rise building model. First, the CAARC high-rise building standard model flow simulation was carried out, and the simulation results were compared with the wind tunnel test results to verify the applicability of the NSRFG method; then, based on the CAARC model, totally 4 corner modification schemes were designed and the base moments power spectrum were obtained through the LES simulation to estimate the top displacement and peak acceleration responses of the building. The results showed that: (1) For the standard high-rise building model with rectangular section, regardless of prototype or 4 modification schemes, the cross-wind fluctuation and peak acceleration are larger than that of the along-wind. (2) Compared with the prototype, all 4 modification schemes can reduce the wind-induced vibration response in along-wind and cross-wind directions, among which the corner slotting has the best optimization performance on along-wind response and the circumferential slotting has the best optimization performance on cross-wind response; (3) The optimization performance of the 4 modification schemes for the cross-wind response is obviously better than that for the along-wind response. Among the schemes, the circumferential slotting is the best, which can reduce the cross-wind fluctuating displacement and peak acceleration by 28.4% and 32.8%, respectively. Therefore, the circumferential slotting scheme is suggested to reduce the cross-wind response of super high-rise buildings with rectangular section.

导出引用

徐洲洋，罗凯文，杨易. 基于大涡模拟的CAARC模型角区开槽气动优化研究[J]. 振动与冲击, 2024, 43(7): 126-133

XU Zhouyang, LUO Kaiwen, YANG Yi. Aerodynamic optimization of corner slotting in CAARC model based on LES[J]. Journal of Vibration and Shock, 2024, 43(7): 126-133

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