南宁五象东盟塔风振响应大涡模拟研究

Large eddy simulation for wind induced responses of Nanning Wuxiang ASEAN Tower

以建筑总高度为528 m高的南宁五象东盟塔为工程案例,采用一种新的湍流入口生成方法——窄带叠加法(NSRFG)对其进行了风振响应大涡模拟(LES)研究,计算了该结构的基底荷载和位移响应,并把数值风洞模拟结果与高频天平测力(HFFB)风洞试验结果进行详细对比。结果表明,顺风向和横方向基底弯矩功率谱数值模拟结果与风洞试验基本一致,扭转方向模拟结果有一定差距。在风振响应方面,数值模拟顺风向风振响应计算结果与风洞试验结果吻合较好,横风向响应和扭转方向计算结果稍偏小。另外在横风向上,该研究的数值模拟方法较好地预测了与试验结果相近的建筑模型漩涡脱落频率,能为结构设计提供有价值的参考。

Here,528 m high Nanning Wuxiang ASEAN Tower was taken as an engineering example,a new turbulent inflow generator named the narrowband synthetic random flow generator（ NSRFG） was used to do the large eddy simulation（ LES） for its wind-induced vibration response. Its base loads and displacement responses were calculated. The numerical wind tunnel’s simulation results were compared with those of the HFFB wind tunnel tests,and the effectiveness and correctness of NSRFG were verified. The results showed that the base bending moment power spectra simulation results in downwind and crosswind directions agree well with those of the wind tunnel tests,but the simulation results in torsional direction have a certain gap compared with the wind tunnel test ones; for the tower’s wind-induced vibration responses,the numerical simulation results in downwind direction agree well with the wind tunnel test ones,but the simulation results in crosswind and torsional directions are a little smaller; in across-wind direction,the predicted value for the vortex shedding frequency of the tower model with NSRFG was close to the wind tunnel test one. The study results provided a valuable reference for structural design.