中文摘要：

采用基于RANS方法的SST湍流模型对斜拉桥斜拉索二维（2D）模型涡致振动进行了数值模拟。2D模型建立和网格划分通过专业前处理软件ICEM—CFD来实现。保持2D模型的频率不变,通过改变风速的方法来研究2D模型涡致振动的特性。研究了2D模型涡致振动的幅值,阻力系数以及锁定区域随约减阻尼变化的规律。研究结果表明斜拉索2D模型发生涡致振动时其幅值随着约减阻尼减小而增大,直至稳定到一个常数,同时通过比较发现数值模拟得到的2D模型幅值与试验结果比较接近;锁定区域随约减风速减小而增大;同样2D模型的平均阻力系数在锁定区域随着约减风速减小而增大。

英文摘要：

2D vortex-induced vibration of a stay cable in cable-stayed bridge was numerically simulated by using the SST turbulent model that is based on a RANS method.The 2D model foundation and grid partition were achieved in the special pre-processor software ICEM-CFD.The characteristics of vortex-induced vibration were researched through changing the velocity of fluid and keeping the frequency of the 2D model constant.The amplitude,the drag coefficient and the lock-in region of the 2D model changing as the reduced damping was researched in the paper.The results indicate that the amplitude of the 2D model increases with the reduced damping decreasing,up to a constant;what＇s more,the results of numerical simulations are close to the experiments.The lock-in region widens as the reduced damping decreasing.In the lock-in region the average drag coefficient increases with the reduced damping decreasing.