并列多方柱风荷载特性的数值模拟研究

NUMERICAL SIMULATION OF WIND LOAD CHARACTERISTICS OF SIDE-BY-SIDE MULTI-SQUARE CYLINDERS

为探究并列多方柱的风荷载特性,文中采用SST k-ω湍流模型,对雷诺数为20000的均匀流场中的并列三方柱进行模拟,基于不同间距方柱的流场特性,归纳并总结了不同间距方柱的气动力系数变化规律和风压系数分布。结果表明小间距会产生偏流且抑制方柱的旋涡脱落,三个方柱的平均风特性均表现出明显的偏向性。当间距比达到2.0时,流场从偏流转变为对称偏压,旋涡脱落频率增大但脉动风特性仍然小于单方柱。方柱的气动力系数和风压系数在间距比4.0时近似于单方柱的值。研究结果可为并列多方柱的风荷载规范条文提供参考。

This study investigates the wind load characteristics of parallel multiple cylinders.The SST k-ωturbu⁃lence model is employed to simulate the parallel three cylinders in a uniform flow field with a Reynolds number of 20000.Based on the flow field characteristics of cylinders with different spacings,the variations of aerodynamic coef⁃ficients and the distribution of wind pressure coefficients for different cylinder spacings are summarized.The results indicate that smaller spacings generate biased flow and suppress vortex shedding from the cylinders,and all three cylinders exhibit significant bias in their average wind characteristics.When the spacing ratio reaches 2.0,the flow field transitions from biased flow to symmetric biased pressure with an increased frequency of vortex shedding but still lower fluctuating wind characteristics compared to a single cylinder.The aerodynamic coefficients and wind pressure coefficients for the cylinders approximate those of a single cylinder at a spacing ratio of 4.0.The results may provide the theoretical support for the wind load code provisions on side-by-side multi-square cylinders.