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The research investigates the dynamics of momentum transport in turbulent flows within urban environments.

February 28, 2026AtmosphereOpen Access

Ventilation Mechanism in an Idealized Street Canyon: A Multiscale Turbulence Approach

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Multiscale turbulence analysis reveals momentum transport dynamics in urban street canyon wake zones, indicating implications for UAV operations.

The research investigates the dynamics of momentum transport in turbulent flows within urban environments.
Conducted large eddy simulation of neutral boundary layer over an idealized street canyon.
Applied wavelet transforms and quadrant analysis to assess momentum transport across three wake zones.
Examined recirculation, entrainment, and detrainment zones for scale-dependent turbulence characteristics.
Observed strong momentum transport at the roof level of the recirculation zone across various scales.
Identified that large-coherent-scale turbulence primarily governs momentum transport in the entrainment zone.
Noted distinct small-scale turbulence activities with quadrant asymmetry in the detrainment zone, influenced by energy contributions from specific events.

Hou et al. (2026) studied this question.

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Multiscale turbulence analysis reveals momentum transport dynamics in urban street canyon wake zones, indicating implications for UAV operations.