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采用有限体积法,湍流效应采用大涡模拟,及使用基于任意拉格朗日-欧拉格式的动网格方法计算任意时刻运动断面所受气动荷载。通过对已有网格生成方法——标准弹簧系数法进行改进,增加角度及边界等改进因子,大大提高了边界移动后的网格生成质量。利用强迫振动法对箱梁及边主梁断面的气动导数进行了数值模拟,计算结果与试验结果取得了较好的一致,表明采用CFD方法进行断面气动导数的数值模拟的可行性。
The finite volume method, large eddy simulation of turbulence and the dynamic grid method based on arbitrary Lagrange - Euler scheme are used to calculate the aerodynamic loads on the moving section at any time. By improving the existing method of generating grid - standard spring coefficient method and adding improvement factors such as angle and boundary, the mesh generation quality after the boundary movement is greatly improved. The numerical simulation of the aerodynamic conductance of box girder and side girder is carried out by means of forced vibration method. The calculated results are in good agreement with the experimental results, which shows that the CFD method is feasible for the numerical simulation of section aerodynamic derivatives.