Speaker
Description
Taking the built environment as the primary consideration in architectural design can promote harmony between the building and its surrounding site and climate. It is essential to assess the wind environment at the initial stage of urban planning and enhance natural outdoor air circulation, which improves pedestrian-level comfort. In an urban setting, while previous research has explored the impact of various topographies on airflows, the precise influence of urban natural topography on local wind conditions remains unclear. Specifically, in scenarios involving different building layouts and small-scale topographic features such as hillocks in hilly regions, the impact of these natural topographies on the pedestrian-level wind environment requires in-depth investigation.
This study uses buildings near hillocks in Nanjing as examples to explore the evaluation and optimization of the outdoor wind environment at the pedestrian-level of buildings affected by these hillocks. By summarizing the evaluation criteria for the comfort of the building wind environment at the pedestrian-level, we utilize software such as Rhino, Grasshopper, and Fluent to classify, summarize, and simulate the wind environment of building cases near small-scale topography in Nanjing. We explore the patterns of how design factors such as hillock shape, hillock height, hillock slope angle, building layout, building orientation, and building height-to-width ratio affect the wind environment at pedestrian height, and summarize the characteristics of the outdoor wind environment of buildings in hilly areas. The main manifestations include: 1. Wind speed varies significantly, with local increases due to topographic effects, and numerous calm-wind zones exist. 2. Wind direction is complex and changeable, highly influenced by topography, and local wind phenomena are prominent. 3. Turbulence intensity is relatively high, and the stability of wind speed and direction is poor. 4. Wind pressure distribution is uneven, with significant differences between windward and leeward sides and at different heights. 5. Building layout has a pronounced impact on the wind environment, and the wind-environment characteristics of building clusters and individual buildings vary depending on their positions.
Simultaneously, we propose an optimization design process for building forms based on natural ventilation and apply it in actual engineering projects to improve the indoor and outdoor wind environments of buildings near small-scale topography in Nanjing, providing architects with technical support during the building-scheme design phase.
| Keywords | Urban wind environment; Urban terrain; Computational fluid dynamics |
|---|---|
| Best Congress Paper Award | No |
