This paper aims to resolve the difficulty in giving reasonable inlet boundary conditions for the numerical simulations on the site of a long-span bridge located in the mountainous area. A multi-scale coupling method was presented such that the inlet boundary values of the mean wind velocity at the mountainous area were provided by the Weather Research and Forecasting (WRF) mesoscale model. The local atmospheric environmental flows over the mountainous area were computed by Large Eddy Simulation (LES), in which the Block Polynomial Interpolation (BPI) method was employed to interpolate the data from WRF to the grids on the inlet boundary of the LES computational domain. This method provided a better solution to the irrational inlet problems caused by the "artificial cliff". The inflow turbulence generating method was used for the input of the fluctuating wind speed, where the fluctuating wind field which satisfies the characteristics of the wind field in the mountainous area was simulated according to the monitored data at the station on the site by using the Weighted Amplitude Wave Superposition (WAWS) method. Then, the application of the proposed methodology on the Lishui Bridge in China is demonstrated as a numerical example. The computational results were compared with the monitored data, which shows that there is a good agreement between the monitored data and the numerical results.
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