FIG. 4.

Schematic of area from top view showing background grid system and immersed building bodies (a). Buildings, roads, and other cityscape features are discretized with unstructured triangular grid systems (in black) and treated as sharp-interface immersed bodies embedded in the flow domain, which is discretized with a structured Cartesian grid system (white lines). Buildings are shown in brown, whereas roads and ground are in green. For clarity, every 30th structured grid cell is shown. (b) Zoomed-in section centered on contaminant release point location marked with a red dot.