箱梁断面气动导数的CFD模拟研究

采用强迫振动方法试验和计算流体力学（CFD）动网格法模拟识别了薄平板以及某一大跨度桥梁断面的气动导数。结果表明，对流线型的薄平板断面，数值模拟值与理论值相当吻合；而对于箱梁断面，数值识别的气动导数与试验值存在较大误差，数值模拟结果在低折减风速更接近试验值，而在高折减风速处差别明显。为提高钝体断面气动导数的数值模拟精度，须加密空间网格和延长计算时间，从而必须付出高昂的计算时间代价。由此可知，对于钝体特性十分明显的桥梁断面，目前CFD在识别其气动导数方面尚存在明显不足之处，尤其是算法的稳定性及效率问题，还不能取代物理风洞研究钝体桥梁断面的流固耦合问题。

Numerical simulation of aerodynamic derivatives of box girder with CFD method

Aerodynamic derivatives of a thin flat plate and a bridge girder section were recognized by use of forced vibration method in wind tunnel test and CFD(computational fluid dynamics) dynamic meshing simulation respectively.Results indicate that,with the flat plate of stream line section,numerical results of CFD simulation are in good agreement with those obtained by wind tunnel test.In the case of box girder section,there exists some obvious discrepancy between CFD numerical simulation and wind tunnel test,ch...