多尺度耦合模拟在高密度城市街区风环境评估中的应用——以深圳为例

项目名称： 多尺度耦合模拟在高密度城市街区风环境评估中的应用——以深圳为例

项目编号： No.51278308

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 袁磊

作者单位： 深圳大学

项目金额： 80万元

中文摘要： 高密度城市亟需自然通风缓解热岛，排除大气污染物，而其内部街区风场受空间特征影响而复杂多变，需要依靠数值模拟精确评价。本项目针对目前街区风环境模拟评价边界条件设定不准确等问题，以街区风环境为对象，开展多尺度耦合的城市街区风环境评估研究。 本项目根据高密度城市空间体量和近地面风场的特征，建立多尺度耦合的数据平台，将大尺度的城市大气边界层特征细化为高分辨率的背景风场，同时利用GIS自动生成街区周边的城市空间模型，从而得到街区风环境模拟的准确边界条件。基于多尺度耦合的数据平台，研究进一步提出街区风环境评估的技术导则，对CFD软件中边界条件设定和模拟过程控制进行界定，保证模拟的可靠性。在评估标准方面，研究提出二次加权风速比评指标，全面反映空间规划对街区风环境的影响，可直接用于评价和指导规划设计。本研究对于优化街区形态，改善高密度城市通风具有重要的理论和现实意义。

中文关键词： 高密度；城市微气候；风环境评估；多尺度耦合；计算流体力学

英文摘要： Natural ventilation is needed to mitigate urban heat island and to diffuse the atmospheric pollutants in high-density cities. Yet the wind environment in the urban communities is very complicated due to the t building configurations, so it should be evaluate accurately with numerical simulation. Nowadays, there are some problems in the community wind simulation, such as the inaccurate boundary conditions, the evaluation standards deviated to urban design and so on. Accordingly, a multi-scale coupling simulation research will be taken on in this project, with the focus on the community wind environment. Based on the characteristics of high-density urban space and urban atmosphere boundary layer, the multi-scale coupling data system will be set to drive community wind simulation, including the high resolution background wind field get from macro scale atmosphere research, and urban space models of surrounding communities generated automatically with GIS programs. The accurate boundary conditions for the wind simulation are available with the system. The further research is on the detailed guidelines for the community wind evaluation. The application of the data mentioned above and other configurations in CFD programs are key factors to correct results. The Quadratic Weighted Wind Velocity Ratio is proposed as eva

英文关键词： high density；urban micro-climate；wind environment assessment；mocir-scale coupling；CFD