Numerical Simulation And Analysis Of The Wind Environment And Thermal Environment Of Campus Buildings

Along with the acceleration of China’s urbanization process, a large number of buildings have sprung up, with the urban environment becoming more and more worse, the urban heat island effect becoming more and more serious. In modern China, the residential buildings are the main forms of urban buildings, and both the outdoor wind environment and the outdoor thermal environment not only have important influence to the residential micro-climate, but also affect the safety and comfort of the residents. How to create good outdoor wind and thermal environment to the residents in the residential construction is one of the hot issues in the field of the research on building environment. However, the effect factors of outdoor wind and thermal environment are many and complex, such as wind velocity and direction, green vegetation, water distribution, solar radiation intensity, air temperature and humidity, building surface and underlying surface material, surface long-wave radiation intensity, man-made heat production etc. With the focus of domestic research on the influence of outdoor wind and thermal environment different, this paper conducted a comprehensive simulation study and analysis of the campus wind and thermal environment. The main research work is as follows.There are three research methods in the study on the wind and thermal environment of urban residential district:field measurement, wind tunnel test and computer numerical simulation. As the computer numerical simulation method has the follow advantages,such as not affected by the influence of the shape of the buildings, short calculation period, low cost, accurately simulation on the building outdoor wind and thermal environment,the simulation results more intuitive etc, it has been used more and more widely.In this paper, based on the results of previous research and a large number of literature data, the outdoor wind environment and thermal environment evaluation criteria of human line height 1.5m are determined, which provide theoretical support for the following simulation results. Based on the standard k-ε mathematical model of turbulence, and the use of the software of CFD to simulate the construction group outdoor wind environment in some university campus, in Jinan, this paper mainly studied the influence of the trees around the buildings in summer and winter on the outdoor wind speed distribution and the pressure distribution. It is found that the trees around the building can effectively reduce the wind speed around the buildings, and especially in the height of 3m-9m, the effects of the trees on the wind speed are very obvious.In this paper, the effects of the underlying surface reflection and the surrounding trees on the outdoor thermal environment are simulated and analyzed. The results show that the trees have great influence on the outdoor wind speed, air pressure and air temperature. The influence of different underlying surface reflection on the thermal environment is significant, and the increase of the surface reflection has little effect on the wind speed near the earth’s surface, but it can decrease the air temperature near the earth’s surface. For the above regions far away from the ground, the average radiation temperature of air increases with the increase of the ground reflection. At the same time, under the same ground reflection, the air temperature above the ground where there are trees around the buildings is slightly lower than that where there are no trees around the buildings.The paper using CFD software simulating the wind and thermal environment of buildings, can not only provide effective analysis and evaluation on the wind and thermal environment for local unreasonable regions that have been built, provide the corresponding improvement measures for decision makers, but also provide a reference to the surrounding wind and thermal environmental conditions for urban planning designers in the early planning and construction of residential buildings, and provide certain reference for further research on the wind and thermal environment in the area.