Numerical Simulation Study On Wind Field Characteristics Of Double-tower High-rise Building With Complicated Shapes

With the development of the modern city, large-scale high-rise and super high-rise buildings spring up. However, with the increase of the height of building, so does the effect caused by wind load. Hence, it is significant to consider the wind resistance during the structural design. Besides,wind power as an abundant and renewable energy resource, which is advocated in green buildings toddy, and equipping wind-driven generator for buildings to make full use of wind energy becomes more and more important.This thesis introduced the basic theory in wind engineering first, and described the performance of average wind atmospheric boundary layer, basic wind speed and pressure, coefficient of wind pressure, shape factor of wind load and the tubulence energy properties of wind. Then, the wind resource in built environment was presented, including evaluation index, wind energy properties in the building field and basic architectural forms to use the wind energy. Afterwards, computational fluid dynamics(CFD) theory was displayed. A detailed discussion was made on equations of CFD(including fluid continuous equation, momentum and energy conservation equation), and turbulence model and finite element numerical calculation method and process. These laid a foundation for numerical simulation follow-up.The main work is to simulate the wind load behavior of two adjacent haplotype high-rise building based on AutoCAD, Gambit and Fluent software. After meshing, Realizable k-? was applied to process 3D steady analysis. Through calculating the wind pressure coefficient surrounding the building surface and the wind field, to verify the correction and precision of method used. On this basis, a wind field simulation test was conducted to a complex shape high-rise tower of Hangzhou. Specifically, building the 3D model by AutoCAD first, and then meshing the model by Gambit, then to calculate the model applying the Fluent software. The simulation test used the Realizable k-? simulate the wind pressure coefficient and Turbulent kinetic energy features with 15 wind direction(working conditions including every 15 degrees) considered, and compared with the wind tunnel test results. According to obtained wind pressure coefficient, the local shape factor and average shape factor could be calculated. Furthermore, the “slit effect” between the towers was studied with distance between the towers changing. Integrating the tendency to call for green building, consider that “slit effect” district can strengthen the wind pressure, where the wind-driven generator may be designed to provide energy. The high-rise building 3D simulation illustrated can provide design references for structural wind resistance and energy saving.