Field measurement and numerical simulation of the relationship between the vertical wind environment and building morphology in residential areas in Xi’an, China

Abstract

：The inadequate consideration of the impact of building morphology on ventilation efficiency in many urban residential areas has resulted in a series of environmental problems that threaten human health. The purpose of this paper is to establish a prediction model between ventilation efficiency and building forms in residential areas. Firstly, the characteristics of vertical wind profile in residential areas are measured through unmanned aerial vehicle (UAV); secondly, the wind speed ratio (WSR) at different height levels under the impact of morphological index (floor area ratio, building density, average building height, enclosure degree, height fall and maximum building height) in the residential area is simulated by ENVI-met; finally, two kinds of prediction formulas are obtained: (1) the average ventilation efficiency at the pedestrian level and (2) the prediction formula of WSR at different heights. The results show that the wind speed (WS) in residential area below 35 m is about 0.6 m/s lower than that in park. The results of numerical simulation show that the mean WSR at the pedestrian level is negatively correlated with each index and the height fall morphological index has the greatest impact on the WSR at different heights. The research can provide a reference for the optimal planning and design of ventilation efficiency of residential buildings, especially those in static wind areas.

The Built Environment Assessment of Residential Areas in Wuhan during the Coronavirus Disease (COVID-19) Outbreak

“…Hu Tingting et al indicated that a higher ventilation efficiency was found in small-building coverage ratios and large passage widths by evaluating the ventilation efficiency through the visit frequency, the space-average normalized concentration, and the space-average wind speed ratio [95]. Through a prediction model between the ventilation efficiency of residential areas and the building form, the largest impact of the height fall morphological index on the wind speed ratio at different heights was found by Feng Wei et al [96]. The results of this study confirmed that a reasonable spatial layout of residential areas could effectively improve ventilation, thereby enhancing the ability of residential areas to resist the spread of COVID-19.…”

Improving the Thermal Comfort of an Open Space via Landscape Design: A Case Study in Hot and Humid Areas

“…We parameterized it by creating a model using the ENVI-met software v4.4. The accuracy of ENVI-met in simulating environmental parameters, including temperature, relative humidity, wind velocity, etc., has been validated by multiple measurement studies [64][65][66]. However, due to the differences in the simulation objects, simulation scale, simulation area and surrounding environment, the model is a simplification of the actual environment to a certain extent, where there are certain differences between simulation and reality.…”

Effects of COVID-19 on Residential Planning and Design: A Scientometric Analysis

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