Study on the influence of voids on high-rise building on the wind environment

Li, Yangluxi; Chen, Lei

In this research, in order to balance the computation time and discretization error, grid sensitivity analysis is carried out. Figure 4 indicates the simulation results of three type grids which are coarse, middle and fine. Different grids are divided into three types based on a linear factor 2 . The coarse grids have 3.0 million and fine grids get 6.0 million grids, respectively. In addition, the minimum mesh size corresponding to the above three types ranges from 0.038 m, 0.027 m, and 0.014 m. Measurement lines locate at vertical and horizontal direction behind the building to compare different grids sensitivity. Figure 4 compares the wind speed distributions of the vertical lines at the gap and horizontal lines beside the pedestrian horizontal plane of the three grids. The results illustrate limited independence on the grid under the three types through WVA (wind velocity amplification factor) values. In this case, the mean difference between the medium and coarse grid along these lines is 0.8% while the fine grid is almost the same as the reference grid. Hence, the medium grid is chosen as the CFD simulated model.