城市冠层内流场和热力结构的数值模拟  

Numerical simulation of flow field and thermal structure in urban canopy layer

作　　者：陈志[1] 胡汪洋[1] 俞炳丰[1] 商萍君[1] 罗昔联[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《安全与环境学报》2004年第4期63-66,共4页Journal of Safety and Environment

摘　　要：选用基于 k-ε湍流闭合方法的城市冠层流场模式 ,用内部建筑物实际大小和布局来表示下垫面 ,从动力学和热力学两方面模拟了西安市的一个城市冠层 ,并将模拟结果与该区域内 3个高度收集的数据进行了比较。结果表明 :计算得出的流场分布与观测拟合值之间有较好的一致性 ,该模式可以用于具有复杂下垫面的城市冠层流场的模拟。As we all known, the environmental problem is highlighted increasingly, especially in urban area. Increasing attention is paid to the urban inhabited environment at present time. In this paper, a three dimensional numerical model based on k-ε closure method was applied to simulate the wind and temperature fields in urban canopy, in which the actual scale and layout of buildings in urban area were used to present underlying surface. A typical district in Xi'an city was modeled in two sides of dynamics and thermodynamics. The influence on air temperature by the factors such as buildings layout and artificial heat release was analyzed with an analytic method, and a cumulative forecast model was presented based on this. The experiments of the vertical profiles of wind velocity and air temperature were carried out. At the same time, the air temperature of different type underlying surfaces in this area was also measured. Under the condition of given dynamic and thermodynamic boundary by the analytic model and partial results of experiments, the results obtained from the numerical model were compared with the experiments data. It is shown that the wind velocity profile and the plane distribution of air temperature achieved by the model accorded well with that observed. The present model can be used to simulate the flow and temperature fields in an urban canopy layer with complex underlying surface and provide helpful reference to the urban district layout design.

关 键 词：环境物理 城市冠层 下垫面 数值模拟 流场 温度场 

分 类 号：X124[环境科学与工程—环境科学] X169