Numerical Simulation Of Wind And Snow Environment In Severe Cold Zone

With the acceleration of urbanization in China,the architectural architectural form and its function distribution in the city are becoming more and more characteristic and diversified,and the problem of the comfort of the living environment is gradually paid attention to.As the snow and snow environment in winter buildings is more important in severe cold areas,the simulation of snow and snow environments of different design types of buildings by means of fine CFD fluid dynamics numerical calculation method can directly and quantitatively analyze and evaluate the snow and snow environment of buildings,provide technical support for the research of snow distribution,climate-based urban planning,off-site environmental design and optimization,make urban planning more accurate grasp of the surrounding snow and snow environment,and provide powerful tools for climate-based planning and design,It is of great significance to the ecological city planning,green building design and the construction of "breathing city" in China.In this paper,the reliability of CFD multi-phase flow numerical simulation is verified by referring to the experimental results of typical cubes.The simulation results match well with the measured data,and the model can be used for subsequent research.Three typical layouts(including parallel layout,staggered layout and oblique layout)with uniform height are selected for simulation analysis.It is found that the parallel layout and oblique layout have moderate snowstorm level in this area,and the snowstorm environment is relatively poor,And from the perspective of architectural lighting environment,staggered lighting effect will be better.Four typical layouts of non-uniform height buildings(ascending,descending,upward convex and downward concave)are selected.Based on the comprehensive analysis of wind and snow speed,snow distribution and storm grade in the buildings,it is found that the downward concave layout has more snow in the street Valley,and the snow environment in this type of street Valley is worse.The ascending layout and downward layout have moderate storm grade,The wind and snow environment is relatively poor,so the wind and snow environment of convex layout is better than the other three,and the building height along the street and facing the wind in the complex is relatively less than the internal height.The actual regional planning map is selected and divided into three construction periods.By modeling and calculating the three construction periods respectively,the changes of the wind and snow environment in the building group with the changes of the three construction periods are compared and analyzed.The initial(phase I)building group had poor wind and snow environment.After the addition of large shopping malls in phase II,the local bad wind and snow environment of the building group was improved.After the completion of the open-air stadium and Concert Hall in phase III,the bad areas in the building group basically disappeared,and the wind and snow environment near the shopping malls in the middle reaches was also improved.When the wind and snow environment of the building group is poor,the public buildings can be used to block and guide the wind and snow flow,so as to improve and optimize the living environment of the building group.