Study on Complex Wind Field Characteristics of Mountainous City Bridge Site

This paper takes chaotianmen yangtze grand bridge as the engineering background, With the help of computational fluid dynamics commercial software fluent, the complex wind field in the bridge site area of mountain city is simulated and analyzed, By comparing the results of wind tunnel test data and theoretical calculation, the characteristics of near surface fluid movement in complex terrain and bridge site are revealed. The relationship between fluctuating wind speed and power spectrum of bridge site simulated by superposition of harmonic method and AR linear filtering method. Research shows that the numerical simulation of the average wind speed in complex mountainous cities has a high precision, Compared with the application of superposition of harmonic method, AR linear filtering method is more suitable for engineering application.