Discussion
Which aspect ratio produces the strongest canyon recirculation?
Answer: A
When the height to width ratio approaches or exceeds one the flow skims over the top and a single stable vortex fills the canyon, which is the skimming flow regime. Wider streets allow the flow to reattach and ventilate better. A canyon aligned with the wind channels the flow along it and ventilates well, which is the opposite of the trapping case.
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