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基于二维RANS模型计算扁平箱梁漩涡脱落的可行性分析

, PP. 24-33

Keywords: 桥梁工程,扁平箱梁,湍流模拟,漩涡脱落,气动力,二维RANS模型

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Abstract:

?为研究二维雷诺时均Navier-Stokes(RANS)模型在获取桥梁扁平箱梁漩涡脱落特性时的可行性,采用基于SSTk-ω湍流模型的二维RANS方程,对大带东桥主桥加劲梁进行了CFD计算(雷诺数Re=1.06×105),获得了加劲梁在不同迭代时间步长、不同网格划分上的气动力系数平均值和脉动值,以及漩涡脱落Strouhal(Sr)数,突出了计算时间步和网格无关检查的重要性。结果表明:相对于漩涡脱落周期T,采用较大的时间步长就能获得气动力系数平均值的近似估计,而要获得漩涡脱落Sr数的收敛估计之计算时间步长应小于T/260;采用二维RANS模型能获得此种箱梁平均气动力系数的近似估计,但得到的漩涡脱落Sr数与风洞试验结果有较大差别。

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