Aerodynamic Characteristic Analysis of Box Girder Section in TSI Gusty Wind

Abstract

采用二维非定常不可压缩雷诺平均N-S方程结合RNG k-ε湍流模型，模拟分析了TSI (Technical Specifications for Interoperability)阵风以−5˚~+5˚攻角作用下箱梁断面的气动力及流场特性。TSI阵风作用过程中，箱梁断面的气动力总体上围绕准定常假设的气动力做小幅波动，但较大风攻角时箱梁断面的气动力波动幅度较大。分析探讨了箱梁断面的阻力系数跳跃现象、升力系数变化滞后于TSI阵风风速变化、流场静压分布的顺压和逆压梯度特性等。The aerodynamic forces on box girder section and flow field are simulated by CFD (computational fluid dynamics) method in TSI (Technical Specifications for Interoperability) gusty wind at the an-gles of attack from −5˚ to +5˚. Reynolds-averaged Navier-Stokes (RANS) equations for 2D incom-pressible unsteady flow are integrated with RNG (Renormalized Group) k-ε turbulence model in this research. The time histories of the aerodynamic forces on the box girder section in TSI gusty wind slowly fluctuate around the reference values based on the quasi-steady assumption, but the oscillation amplitudes at high angles of attack are relatively large. The sudden change of drag co-efficient, the change of lift coefficient lagging the wind speed of the TSI gust, and the favorable and adverse pressure gradients are observed and analyzed.