FIG. 6.

Contours of instantaneous velocity magnitude, normalized with mean-flow velocity of dominant wind (=3.58 m/s), at t =23.3 min, from side (a) and top (b) views. Side view (a) is shown on a vertical plane along line P₁ in Fig. 5. Top view (b) shows the horizontal plane approximately 20 m above mean ground level. Buildings and the ground are shown in gray. The tallest building in (a) is one liberty plaza. In both views, wind flows from South (left) to North (right).