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.
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 Haili1,2,ZHOU Qiang1,2,MA Cunming1,2. A numerical simulation method for wind field characteristics of mountainous valley at bridge site. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(16): 200-207.
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