Abstract
This paper explores the method of assessing regional spatial ventilation performance for the design of residential building arrangements at an operational level. Three ventilation efficiency (VE) indices, Net Escape Velocity (NEV), Visitation Frequency (VF) and spatial-mean Velocity Magnitude (VM), are adopted to quantify the influence of design variation on VE within different regional spaces. Computational Fluid Dynamics (CFD) method is applied to calculate VE indices mentioned above. Several residential building arrangement cases are set to discuss the effect of different building length, lateral spacing and layouts on four typical space patterns under wind directions oblique or perpendicular to the main (long) building facade. The simulation results prove that NEV, VF and VM are useful VE indices, which can reflect different features of flow pattern in studied regional domains. Preliminary parametric studies indicate that wind direction might be the most important factor for improving spatial ventilation. When the angle between main building facade and wind direction is more than 30°, ventilation of different exterior spaces could improve evidently. When wind direction is perpendicular to main building façade, decreasing building length can increase NEV of the middle space by 50%, while decreasing lateral spacing would decrease NEV of the intersection space by 35%.
Highlights
Exterior wind conditions are important in urban residential areas
This paper further explores the method of assessing regional spatial ventilation performance using net escape velocity (NEV) as an index for the design of residential building arrangements at an operational level
This study presents a preliminary investigation of the relevance of ventilation efficiency in
Summary
Exterior wind conditions are important in urban residential areas. Wind flow around buildings can dilute pollutants and remove excess heat, both of which are closely related to people’s health and quality of life. Based on measurements (field and wind tunnel tests) and/or numerical simulations, numerous studies have discussed the influence of building arrangements on exterior wind conditions. These studies provided a new perspective from the ventilation efficiency of urban areas These studies provided a new perspective which to assess and improve wind environments of exterior spaces. To fully discuss spatial ventilation performance, spatial mean velocity magnitude (VM) and visitation frequency (VF) are employed as indices in this study, as they can reflect the air flow rates and recirculation phenomena of the calculated domains To calculate these ventilation performance indices, CFD simulation with ANSYS-Fluent 13.0 is adopted. Five examples of building arrangements are chosen according to the designs typically found in real residential districts They represent possible design changes in building length, lateral spacing and layout patterns. Literature Review on Urban Wind Flow Prediction for Building Arrangement Design
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