Study on the Wind Environment and Pollution Diffusion of Building Group Based on LES Staggered Joint Arrangement

In this paper, computational fluid dynamics (CFD) numerical simulation and wind tunnel tests are used to study the wind environment of typical buildings in coastal cities. Firstly, the geometric three-dimensional model is established, and the overall wind environment characteristics of the building complex are determined by wind tunnel testing. Secondly, the experimental data are used to fit the inflow wind profile and turbulence profile, and the secondary development is used as the entrance boundary condition of large eddy simulation (LES). In order to ensure the accuracy of the numerical simulation, the grid of the numerical simulation model is analyzed. Finally, the flow field characteristics and distribution patterns of staggered buildings are obtained by numerical simulation. The results show that when the wind tunnel test is used as the boundary condition of the numerical simulation entrance, the velocity of the numerical wind field in the atmospheric boundary layer environment decreases gradually due to the occlusion effect of the front buildings. Only considering the velocity wind profile as the inflow condition, the results are quite different from the wind tunnel test results. If considering the effect of turbulence profile and velocity wind profile simultaneously, the deviation is smaller. The flow field is different in different wind directions. The wind environment of the buildings in the back row at the 0° wind direction angle is deeply affected by the buildings in the front row. The reduction degree of wind speed is high at the 30° and 60° wind direction angles. The wind speed of the ventilation corridor along the 90° wind direction angle is faster, but the area of the static wind area at the leeward side of the buildings is larger, which is not conducive to the air circulation.