一种山区峡谷桥址区风场特性数值模拟方法

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (16) : 200-207.

论文

靖洪淼1，廖海黎1,2，周强1,2，马存明1,2

作者信息 +

A numerical simulation method for wind field characteristics of mountainous valley at bridge site

JING Hongmiao1,LIAO Haili1,2,ZHOU Qiang1,2,MA Cunming1,2

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文章历史 +

摘要

为准确获得山区峡谷桥址处的风场特性，以一座在建的山区峡谷大跨度桥梁为工程背景，基于开源的计算流体动力学（Computational Fluid Dynamics, CFD）软件OpenFOAM平台，提出了一种山区峡谷桥址处风场特性的数值模拟方法，改进了计算域形态，设置了地形过渡段，并利用“虚拟标准气象站”法获得了计算域入口风速条件，从而实现了高质量的山区风场数值模拟，解决了数值计算雷诺数与实际不符的难题。在此基础上，分析了大桥主梁上横桥向和顺桥向的风速及放大系数、风攻角、风向角和不同跨度处的风剖面。同时结合流线显示方法，研究了桥址处主梁风场流动机理。结果表明：该桥址处的基本风速为24.75 m/s；河道岸边的陡峭山体对气流的干扰作用很大，使风攻角、风向角和风速放大系数在桥位处发生较剧烈变化；部分来流下的风剖面形态受地形影响较大，底部出现急加速现象，风速呈现显著的剪切特性。本文提出的数值模拟方法丰富了山区峡谷桥址处风场特性分析手段，对山区桥梁抗风设计有一定的指导作用。

Abstract

Based on the open source computational fluid dynamics (CFD) software OpenFOAM, a new method, which improves the computational domain, terrain transition section and the inlet condition obtained by “virtual standard weather station” method, was proposed to solve the disagreement between numerical and actual Reynolds numbers and accurately obtain the wind field characteristics of bridge site in a mountainous terrain.Then the wind velocity and speed-up factor, wind angle of attack, wind direction and wind profile along the bridge span were analyzed.Moreover, the flow mechanism of wind field was also studied by the flow display.The results show that the basic design wind speed at the bridge site is 24.75 m/s.The mountain on the sides of the river has an obvious influence on wind field, thus the wind angle of attack, wind direction and speed-up factor change dramatically along the bridge span.The wind profile was greatly affected by the terrain in the certain wind directions, then the wind speed near the ground accelerated rapidly and exhibited significant velocity-shear characteristics.

导出引用

靖洪淼1，廖海黎1,2，周强1,2，马存明1,2. 一种山区峡谷桥址区风场特性数值模拟方法[J]. 振动与冲击, 2019, 38(16): 200-207

JING Hongmiao1,LIAO Haili1,2,ZHOU Qiang1,2,MA Cunming1,2. A numerical simulation method for wind field characteristics of mountainous valley at bridge site[J]. Journal of Vibration and Shock, 2019, 38(16): 200-207

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