Research On District Planning Scheme Based On Cfd Simulation Of Atmospheric Thermal Environment

With the fast development of urbanization and the high-speed growth of city population, additionally due to the improper and unreasonable planning of city structure, improper building settlements and arrangements, atmospheric thermal environment of cities especially in city district has been getting further worse. Therefore the severe problem the cities now facing is the worse atmospheric thermal environment and the vast amount of energy consumption. Restricted by the world situation, elimination of these problems is urgent. The most important and original work on it is to introduce the CFD technique to simulate, predict and evaluate the city or district atmospheric thermal environment in the schematic stage of district planning in order to improve the scientific and ecological characteristics of the planning. Due to the complex of district environment and building arrangement, accurate estimation and evaluation of district atmospheric thermal environment cannot be obtained only by empirical experience and simple calculations. Maneuverable evaluation method of district atmospheric thermal environment including the dominating evaluation index has not yet available. This is the reason that the planning work of district atmospheric thermal environment has not been widely implemented. Based on this situation, preliminary improving work is attempted in our research, based on the CFD simulation and prediction and mature theories and experiences worldwide, associated with the actual situation of our country, a scientific, reasonable and practical evaluation system of district atmospheric thermal environment has been established.The concept of district atmospheric thermal environment, the idea of introduction of FLUENT software in the schematic stage of district planning (with the aid of GIS and SketchUp software) to simulate, predict and evaluate the district atmospheric thermal environment have been proposed. To make the ecological evaluation of the district atmospheric thermal environment, bases on the concept of the factor of non-uniformity of air distribution and the largest deviation index, practical evaluation indexes and a scientific, reasonable and practical evaluation system of district atmospheric thermal environment has been established.Simulation and prediction of a district atmospheric thermal environment employed with FLUENT software, the establishment of the evaluation system and its application process is introduced. Further explanation of its application process is also presented with an actual district planning project. The application of the evaluation system in the existing district is also introduced.Our research works can be used as a guidance and reference in the work of district environmental planning; widely use of it, scientific and ecological characteristics of the district planning can be upgraded.Our work is a kind of research of application basis, although its process is reliable, advanced and scientific, the total system should be verified, revised and consummated in the future practical work.