高速铁路箱梁桥风场数值模拟分析

Numerical Simulation Analysis of Wind Field of Box Girder Bridge in High-Speed Railway

本文对高速铁路箱梁桥周围风场进行了数值模拟研究,运用高性能集群和CDF软件分析了不同雷诺数对高速铁路桥周围风压和流速的影响,并研究了在网格数、分区方式分别不同时集群的计算效率.分析结果表明:当雷诺数较小时,箱梁周围风场较稳定,随着雷诺数增大,底部负压增大,背风面压强由零变为负压,且负压慢慢增大,背风面出现回流,箱梁周围风场逐渐紊乱.对于并行计算,计算时间随网格数增加而增加,但并行运算速度增加的趋势逐渐变小.分区方式不同时,每个区的总网格数划分越平均,计算所需要的时间则越短,效率增加.

The numerical simulation of the wind field around the high-speed railway box girder bridge is studied. The influence of different Reynolds numbers on the wind pressure and velocity around the high-speed railway bridge is analyzed by high performance cluster and CDF software. The computational efficiency of the cluster is studied when the number of grids and the partitioning methods are different. The results show that when the Reynolds number is less, the wind field around the box girder is more stable. As the Reynolds number increases, the bottom negative pressure increases, the pressure of the leeward surface changes from zero to negative pressure, and the negative pressure increases slowly. Surface appears backflow, the wind around the box girders gradually disorder. For parallel computing, the computation time increases with the number of grids, but the trend of increasing the speed of parallel computing becomes smaller. When the partitioning method is different, the total number of meshes in each area is more average, and the time required for calculation is shorter and the efficiency is increased.