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

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (16) : 200-207.

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

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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.

Key words

mountainous valley / long span bridge / wind field characteristics at bridge site / OpenFOAM / numerical simulation

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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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