Theory And Method Of Data Exchange On Coupling Interface For FSI Analysis And Calculation Program Of Numerical Wind Tunnel

Super high-rise and large span structures are are quite sensitive to wind loads. These flexible structure will produce deformation and vibration under the wind load,which will effect the wind field around and the wind pressure distribution of complicated structural shapes and then produced fluid-solid coupling effect. Fluid-structure coupling effect makes a lot of building structure in major disasters, but due to the complexity of the problem, the problem has not been solved. With the development of computer technology over the past decade, it provides a new opportunity to study fluid-structure coupling. The main contents in the paper are as follows :At first, weak coupling algorithm are analyzed; next, by computational fluid dynamics(CFD) control equation based on technique of large eddy simulation(LES) are derived, used finite volume method for three-dimensional turbulence equations discrete treatment, and solved by SIMPLE algorithm. Then this paper derived computational structural mechanics equations, whose numerical method based on Newmark-β, and then focused on the theory and method of data exchange on coupling interface for FSI analysis. The grid generation program and calculation program of the fluid-structure coupling numerical method in the structural wind engineering are developed and described based on the work above.Calculated and analysed plate under the wind load using the numerical wind tunnel program solving fluid-structure interaction problems developed in this paper. A flow around around the tablet phenomenon, around the same cross section(section z = 4 m or z= 3.5 m) in plate area(y = 0 ~ 0.5 m) the three dimensional flow field velocity u, v and w value were close; plate edge speed w changes greatly, and the flow field in the other area speed w is greater than u, v. Different time the same cross section along the same direction(x or y axes) wind speed change trend consistently. The existence of the fluctuating wind make the structure displacement values different with different time,the structure is doing small displacement reciprocating motion. And the structure displacement value is much smaller compared with the structure size. At the same time the top of the tablet reached the maximum displacement value. Comparison calculated with ANSYS Workbench simulation of the commercial software shows that most of the measuring point deviation less than 20%, which means that the calculation results of the plate of fluid-solid coupling flow field calculation, structural response and interface information processing in the paper are basically identical with the software simulation.