Robustness of the Mean Flow Similarity in an Urban Roughness Sublayer to Different Inflow Properties

This study uses a numerical simulation to examine the local mean flow similarity within an urban roughness sublayer (RSL). The simulations are conducted using a realistic building geometry for the central area of Tokyo under three different inflow conditions. The inflow properties are controlled by...

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Bibliographic Details
Published in:Boundary-layer meteorology 2023-03, Vol.186 (3), p.455-474
Main Authors: Inagaki, Atsushi, Inoue, Ryo, Kanda, Manabu, Mori, Yasuaki
Format: Article
Language:English
Subjects:
Atmospheric boundary layer
Atmospheric Protection/Air Quality Control/Air Pollution
Atmospheric Sciences
Boundary layer height
Buildings
Earth and Environmental Science
Earth Sciences
Experiments
Geometry
Height
High rise buildings
Inflow
Laboratories
Mathematical models
Mean winds
Meteorology
Numerical analysis
Numerical simulations
Research Article
Reynolds number
Reynolds stress
Robustness (mathematics)
Roughness
Similarity
Simulation
Simulation methods
Skyscrapers
Tall buildings
Turbulence
Velocity
Wind speed
Wind velocities
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Summary:This study uses a numerical simulation to examine the local mean flow similarity within an urban roughness sublayer (RSL). The simulations are conducted using a realistic building geometry for the central area of Tokyo under three different inflow conditions. The inflow properties are controlled by changing the surface geometries in the upwind direction, which results in various ratios of boundary-layer height to roughness height in the target region. The local mean wind velocities within the RSL, which vary significantly in space, are proportional to each other in all simulations, regardless of the inflow conditions. The velocity within the RSL is represented by the friction velocity, which is estimated from the Reynolds stress profile in the inertial sublayer. The behaviour of the wake turbulence behind isolated high-rise buildings differs considerably among the inflow conditions. Velocity persists for long distances downstream in cases with a low boundary- layer height relative to an isolated building, whereas it diffuses rapidly in cases with a higher boundary-layer height. This effect can propagate into the RSL and modify the mean flow similarity within the sublayer.
ISSN:0006-8314
1573-1472
DOI:10.1007/s10546-022-00764-z