Recent Advances in Urban Ventilation Assessment and Flow Modelling

• Main Author: Hang, Jian (auth)
• Other Authors: Buccolieri, Riccardo (auth)
• Format: Electronic Book Chapter
• Language: English
• Published: MDPI - Multidisciplinary Digital Publishing Institute 2019
• Subjects: natural ventilation hour; concentration fluctuation; n/a; particle number concentration (PNC); passive ventilation; air change rate per hour (ACH); traffic tidal flow; urban air quality; small open space; flow and turbulence profiles; nanoparticles; Computational Fluid Dynamics (CFD); validation; air quality; high emitting vehicles; air change rate (ACH); pollutant dispersion; sampling; highly-reflective building envelope; building arrangements; residential building; urban street canyon; seasonal variation; BEopt analysis; Large Eddy Simulation (LES); residential wind environments; CFD; street-level ventilation; Japan cities; indoor-outdoor; ventilation; coherent structures; inter-building effect; outdoor ventilation; hypothetical urban areas; surrogate model; ultrafine particles (UFP); building-tree grouping patterns; aerodynamic and deposition; numerical simulation; street vegetation; wind catcher; urban air quality modelling; thermal comfort; on-road air quality; pedestrian exposure; street canyon; mobile laboratory; Natural Ventilation Potential (NVP); dispersion; schematic urban environment; air flow; concentration decay method; source apportionment; urban planning; Total Suspended Particles (TSP); natural ventilation; optimisation; mass concentration; ventilation assessment; road tunnel; heat loss; multiple linear regression; computational fluid dynamics (CFD); tree scenarios; wind pressure coefficient; vehicular pollution; urban morphology; wind environment; the age of air; wind tunnel; building site coverage; climate zone; architectural intervention; convective boundary layer; ventilation system; wind-tunnel dataset; urban age of air; building energy use; non-uniform distribution of the pollution source; urban layout; pollutant removal; space pattern; PM2.5; data assimilation; water channel experiment; CFD simulation; airflow network; ventilation efficiency; traffic composition; wind enhancement; intake fraction; carbon dioxide concentration; CFD model; PM10; computational fluid dynamic (CFD) simulation; ventilation effectiveness; LES
• Online Access: DOAB: download the publication; DOAB: description of the publication

This book contains twenty-one original papers and one review paper published by internationally recognized experts in the Atmosphere Special Issue ""Recent Advances in Urban Ventilation Assessment and Flow Modelling"", years 2017–2019. The Special Issue includes contributions on recent experimental and modelling works, techniques, and developments mainly tailored to the assessment of urban ventilation on flow and pollutant dispersion in cities. The study of ventilation is of critical importance, as it addresses the capacity with which a built urban structure is capable of replacing the polluted air with ambient fresh air. Here, ventilation is recognized as a transport process that improves local microclimate and air quality and closely relates to the term “breathability”. The efficiency with which street canyon ventilation occurs depends on the complex interaction between the atmospheric boundary layer flow and the local urban morphology.The individual contributions to this Issue are summarized and categorized into four broad topics: (1) outdoor ventilation efficiency and application/development of ventilation indices, (2) relationship between indoor and outdoor ventilation, (3) effects of urban morphology and obstacles to ventilation, and (4) ventilation modelling in realistic urban districts. The results and approaches presented and proposed will be of great interest to experimentalists and modelers, and may constitute a starting point for the improvement of numerical simulations of flow and pollutant dispersion in the urban environment, for the development of simulation tools, and for the implementation of mitigation strategies.