Application Of CFD To Numerical Simulation Of Wind-load On The Chongqing Grand Theater

With the development of computational technology, Computational Wind Engineering (CWE) draws more and more attention and plays a more and more important role in the wind engineering community by its unique merits and promising prospect in the past two decades. At the same time, more and more complex-shape buildings are coming forth , the building forms described in the relevant codes will not usually match the complex shapes of the buildings. Under such cases, we usually derive the wind-induced pressures distribution on the surface of the buildings by wind tunnel test whether at home or abroad. Based upon CFD software—FLUENT, this paper focuses on the numerical simulation technology for wind-induced pressures distribution on the surface of the Chongqing Grand Theater.The principal theories and basic characters of CFD were expatiated firstly, and the principal and methods of how to decide the flow area, grid, boundary conditions, turbulence model and caculation parameters were summarized in this paper. Based on the theories, the model of Chongqing Grand Theater was built, the C program of mean wind section plane, turbulence kinetic energy and turbulence disspipation rate were compiled and the distribution of wind-induced pressures distribution was simulated.The turbulence distribution was simulated by the self-difining function of terminal condition in programming, and the suitable terminal condition, turbulence model and mesh type were used. The factors influencing the result accuracy are many, and the main influence factor is the turbulence model. Based on the RANS method, RSM model has the best result in the numerical modeling of large Re fluid flow around obtuse object. The windward side of the theater has the plus presure, and the roof, leeward side and lateral side has the suction pressure. It is noticeable that long span cantilever beam has the plus pressure on the bottom surface and suction pressure on the top surface under most wind. This would include a lifting force.Meanwhile, based on the data of the simulation and the Load code for the design of building structures, the shape coefficientμ_s is deduced in this paper, which is applicable to wind-resisting design of the building.