Abstract
This paper describes the numerical simulation results of air flow around street blocks by means of 3D Large Eddy Simulation. The comparison between numerical simulation and wind tunnel experiment was carried out precisely in a case of 3H_b building interval (H_b : building height). Furthermore several numerical simulations were conducted with various building intervals (1H_b, 5H_b, 7H_b and 9H_b) on the basis of the studies in the case of 3H_b. By analysing the numerical results, many new information in wind engineering are given as shown below. 1. The pattern of the flowfield and the pressure distribution in the case of 1H_b is greatly different from other cases. 2. In the case of 1H_b the reattachment does not appear at the ground of the leeward area of the building model. But it appears in other cases. 3. When the building interval increases, the reattachment point at the ground moves toward the building. 4. Although the velocity deficit behind the building model remains clearly in case of 3H_b, it almost disappears in case of 9H_b.
