IEC阵风作用下箱梁断面的气动特性分析

基于二维非定常不可压缩雷诺平均N-S方程和RNG k-ε湍流模型，采用CFD（computational fluid dynamics）方法对箱梁断面在IEC（international electrotechnical commission）阵风以? 5°～+ 5°攻角作用下的气动力及流场特性进行数值模拟分析，获得了IEC阵风作用过程中箱梁断面的三分力系数的总体变化特征、入口边界静压变化特性及流场内静压的顺压和逆压特性等。分析表明，IEC阵风模型比TSI（technical specifications for interoperability）阵风模型更适于桥梁气动力的数值模拟分析。

Aerodynamic Characteristic Analysis of Box Girder Section in IEC Gusty Wind

The aerodynamic forces on the box girder section and flow field are simulated by CFD (computational fluid dynamics) method in IEC (international electrotechnical commission) gusty wind at the angles of attack from ? 5° to +5°. Reynolds-averaged Navier-Stokes (RANS) equations for 2D incompressible unsteady flow are integrated with RNG (renormalized group) k-ε turbulence model in this research. The general characteristics of the static aerodynamic forces on the box girder section in the IEC gusty wind, the characteristics of the static pressure at the inlet boundary, and the favorable and adverse pressure gradients in the flow field are obtained. The analysis shows that the IEC gust model is more suitable for numerical simulation of aerodynamics forces on bridge than TSI (technical specifications for interoperability) gust model.