大桥护栏对桥梁定常气动力特性的影响

Simulation of Two-dimensional Turbulent Flows around a Bridge Model

采用k -ε湍流模型封闭的雷诺时均N -S方程和建立在交错网格基础上压力 -速度场迭代求解的SIMPLE算法 ,对大桥主梁节段模型的定常气动力特性进行了数值模拟 ,计算结果与风洞试验较为一致 ;在此基础上研究了护栏的高度和位置对桥梁气动力特性的影响 ,得到的结论对桥梁工程的优化设计有指导意义。

The simulation of two-dimensional flows around a bridge model was studied both numerically and experimentally. The Reynolds-averaged Navier-Stokes Equations together with the k～ε turbulent model were solved by SIMPLE method. Low speed wind tunnel was used for experiments. The aerodynamic forces that were accomplished by numerical simulation and experiments agreed well. According to the content mentioned above, the pneumatic effect to bridges caused by the different heights and positions of the bridge guard railing was studied. The conclusion is a guide for the bridge-optimized design.