Influence of Urban Road Green Belts on Pedestrian-Level Wind in Height-Asymmetric Street Canyons
نویسندگان
چکیده
This study was conducted to examine the effect on airflow of shape an urban road green belt in asymmetrical street canyon. In this paper, field at pedestrian height with different building ratios (ASF) both sides is modeled and simulated using computational fluid dynamics (CFD) software, ANSYS FLUENT, flow rate characteristic distribution index average intensity are used evaluate analyze level. The shows that: (1) empty scheme ratios, static wind area located roof downstream building; closer ground a ASF = 1/3, lower rate. However, situation opposite that other streets (2/3, 3/1, 3/2). (2) position makes windward side step-up higher than leeward side, step-down side. (3) Compared forms, use two plates three belts incremental can increase circumferential sinking roofs street, thereby improving environment entire street. one plate, two-belt three-plate, four-belt scenarios allows ends corner vortex carry more into interior reduces “wind shadow effect” middle “air outlet ends.
منابع مشابه
Estimating Height and Diameter Growth of Some Street Trees in Urban Green Spaces
Estimating urban trees growth, especially tree height is very important in urban landscape management. The aim of the study was to predict of tree height base on tree diameter. To achieve this goal, 921 trees from five species were measured in five areas of Mashhad city in 2014. The evaluated trees were ash tree (Fraxinus species), plane tree (Platanus hybrida), white mulberry (Morus alba), ail...
متن کاملPedestrian-Level Urban Wind Flow Enhancement with Wind Catchers
Dense urban areas restrict air movement, causing airflow in urban street canyons to be much lower than the flow above buildings. Boosting near-ground wind speed can enhance thermal comfort in warm climates by increasing skin convective heat transfer. We explored the potential of a wind catcher to direct atmospheric wind into urban street canyons. We arranged scaled-down models of buildings with...
متن کاملNumerical Simulation of Wind Flow and Pollution Transport in Urban Street Canyons
In this study, a three-dimensional numerical simulation of the wind flow and pollutant transport in street canyons is carried out by a new specific solver, which is developed and coupled into an open source CFD tool box, the OpenFOAM package. The new model has been applied to study the effect of roof shapes and building heights on the flow patterns and pollutant transports in the street canyons...
متن کاملDynamical Modeling of Stochastic Wind Flow in Street Canyons
For decades, the borders of building studies were restricted up to the exterior walls. With better understanding the side effect of urbanization on human health and with excessive progress in new investigation tools, the area of building studies were enlarged to neighborhood environment where mass and air transport vividly interacts with the buildings. Unlike the indoor studies, one can emphasi...
متن کاملConcentration and flow distributions in urban street canyons: wind tunnel and computational data
The goal of this paper is to present bluff body flow and transport from steady point sources of pollutants, or chemical and biological agents in an idealized urban environment This paper includes ventilation behavior in different street canyon configurations. To evaluate dispersion in a model urban street canyon, a series of tests with various street canyon aspect ratios (B=H) are presented. Bo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Atmosphere
سال: 2022
ISSN: ['2073-4433']
DOI: https://doi.org/10.3390/atmos13081285