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数值模拟桥梁断面气动导数和颤振临界风速

, PP. 41-45

Keywords: 桥梁工程,颤振临界风速,数值模拟,桥梁断面,气动导数

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Abstract:

?从描述流体绕运动的刚性断面流动的N-S方程出发,首先采用时间二阶Projection-2算法对控制方程作分裂步处理,得到的求解方程空间离散采用有限体积法,物面运动方式为自由度解耦的强迫振动,采用计算网格和刚性截面刚性连接、同步运动的动网格技术,数值模拟了振动的大带东桥绕流场,由计算的气动力按最小二乘法提取气动导数,最后计算了大带东桥的颤振临界风速。计算的大带东桥气动导数与风洞试验有很好的一致性,大带东桥颤振临界风速模拟值与风洞试验结果偏差很小,证明了本文数值方法的正确性和工程适用性。

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