| The deterioration of the ventilation environment in the old urban area of Hefei is caused by the disorderly layout of internal buildings and the lack of open spaces, exacerbating the urban heat island effect and air pollution. Previously, only the ventilation analysis method of a single building form was considered, lacking consideration of the three-dimensional morphological characteristics of buildings. In this study, a wind environment assessment method based on the three-dimensional morphological characteristics of buildings is constructed, taking the old urban area of Hefei as the research object. The research results indicate that: (1) The wind environment quality in the old urban area of Hefei is relatively poor, with better wind environment quality in the water area around the city moat and its surroundings, while the northern, southern, and internal areas of the city moat generally have poor wind environment quality; (2) Based on the evaluation results, the old urban area is divided into wind environment stable zones, preservation zones, and improvement zones. The stable and preservation zones mainly focus on maintaining the current situation, while potential corridor excavation, arrangement of open spaces, control of building height orientation, and demolition of unauthorized buildings are proposed as spatial morphological and functional layout optimization strategies for the improvement zone; (3) The internal area of the city moat is selected for spatial optimization simulation verification. The PHOENICS simulation cloud map shows that the average wind speed in the study area increased from 2.78m/s to 2.94m/s, proving that the optimization measures can effectively improve the ventilation environment in the old urban area. The VRI index introduces the influence of building height, facade, and volume on air flow, providing a more precise wind environment assessment than single morphological parameters. |
