The Numerical Simulation Of The Coefficient Of Wind-pressure For Folding Reticulated Shell

Folding reticulated shell is one kind of buildings with complex shape, made of lightweight materials. The key of wind force proofing design is determining the coefficient of wind-pressure and the shape coefficient of building. The existing norms don't have relevant provisions. It also don't have relevant researsh to consult.The traditional method of derermining buildings' surface pressure coefficient is wind tunnel experiment. However, the method is costly. The wind tunnel is difficult to simulate the wind profile. Scale model test makes reynolds number difficult to be similar. Numerical simulation of wind pressure coefficient as a new method, with low cost and high efficiency, has been widely used and in-depth research.This article based on atmospheric boundary layer theory and the basic principles of fluid dynamics, based on Fluent computing platform, establish its three-dimensional model for numerical simulation of wind pressure based on the characteristics of folded shell. By calculating the comprehensive analysis, discuss of the numerical wind tunnel for wind profile, turbulence model, the mesh method, mesh number of computational domain size parameter and the convergence criteria to judge the development and determine reasonable parameters. On this basis, Taking account off different wind speed, wind direction and angle of folding under the pressure shell surface to simulate the average wind pressure coefficient by the surface contours and the structure of shape coefficient. After comparison with the structure analysis of wind tunnel test results, they are good agreement. It's validate numerical simulation methods used to calculate the structure of the surface of the feasibility of wind pressure and the shape coefficient.After the virtual level of atmospheric boundary layer wind tunnel test of homogeneity, parameters and boundary conditions can explain the virtual wind tunnel to maintain a balance of self. After the surface pressure characteristics of the surface pressure distribution that the mechanism of wind-resistant design to determine the structure is not conducive to regional and wind direction. Comparison of structural shape coefficient determined by numerical simulation and wind tunnel test wind speed, wind direction on the shape coefficient of the degree structure.