箱梁断面气动导数的CFD模拟研究

刘钥;张志田;陈政清

振动与冲击 ›› 2011, Vol. 30 ›› Issue (8) : 243-248.

PDF(4454 KB)
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振动与冲击 ›› 2011, Vol. 30 ›› Issue (8) : 243-248.
论文

箱梁断面气动导数的CFD模拟研究

  • 刘钥1; 张志田2; 陈政清2
作者信息 +

Numerical sulation of arodynamic drivatives of box girder with CFD method

  • Liu Yue1; ZHANG Zhi-tian2; CHEN Zheng-qing2
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文章历史 +

摘要

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。

Abstract

Aerodynamic derivatives of a thin flat plate and a bridge girder section are recognized through forced vibration method in wind tunnel and CFD dynamic meshing simulation, respectively. Results indicate that, with the case of the 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, characterized by two errors in low reduced wind velocities and large errors in high reduced wind velocities. In order to increase the precision of CFD identification of aerodynamic derivatives for bluff sections, refined spatial grid and prolonged computing time are needed at the expense of precious computing time. Thus, a conspicuous disadvantage exists in the present CFD numerical method in the identification of aerodynamic derivatives of bluff girder sections, especially the stability and efficiency of the CFD algorithm. In the view of this, the CFD method cannot supplant the physical wind tunnel test for the moment when the fluid-structure interactions of blunt bridge section are involved.

关键词

数值模拟 / 箱梁断面 / 风洞试验 / 气动导数 / 薄平板

Key words

numerical simulation / box girder section / wind tunnel tests / aerostatic derivatives / thin flat plate

引用本文

导出引用
刘钥;张志田;陈政清. 箱梁断面气动导数的CFD模拟研究[J]. 振动与冲击, 2011, 30(8): 243-248
Liu Yue;ZHANG Zhi-tian;CHEN Zheng-qing. Numerical sulation of arodynamic drivatives of box girder with CFD method[J]. Journal of Vibration and Shock, 2011, 30(8): 243-248

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