Research On Flow Calculation Technique And Wind Load Shape Coefficient Of Five Arch Folded Space Truss Structures

The five arch folding space truss structure has the characteristics of light weight, large space of use, rapid expansion of the space, and the volume of the folding, which can be widely used in the field of military engineering and civil engineering. The structure using environment and structure characteristics together determine the structure of wind load sensitive, at home and abroad has not yet commenced about the wind load of structure calculation method research, at present our specification also did not give its wind load shape coefficient method. In this paper, the method of large eddy simulation is used to analyze the flow around a bluff body and the method of wind load shape coefficient, and the research results have important engineering practical value. The main research contents and results are:This paper analyzes the fundamental flow control equations and the large eddy simulation theories, Derived the based on the box filter function and the standard Smagorinsky subgrid model for large eddy simulation of differential control equation; using the finite volume method to discrete,is the central difference format momentum equations are discretized each coefficient and the constant term expression; analysis of the bluff body boundary, boundary of the computational domain processing method with the simple algorithm implementation strategy; optimize the prophase development of three-dimensional multiple structured meshing procedure; developed based on large eddy simulation method of bluff body flow around a calculation program. The numerical simulation of the flow around a typical square cylinder is performed using the program. The results of this paper are in good agreement with the relevant literature. The accuracy of this procedure is verified.The calculation program of moment five arch folded grid tent structure was numerically simulated in the wind tunnel, analyzes the structure of the surface pressure distribution, calculated the structure on the surface of each of the relevant node pressure statistical average value, resulting in the structure of the surface wind load shape coefficient. The results show that there is no uniform distribution of wind pressure on the surface of the structure, the local wind pressure is larger than the average wind pressure, and the size of the wind pressure varies with time. The average wind pressure maximum value in structure wind on the face of the coordinate for(X=0.78 m, Y=30.52m), the maximum value for 208 Pa, maximum average pressure in top surface coordinates to(Y=30.52, Z=22.23) and its value for-269 Pa. Structure of the wind load in the central area of the wind load is the largest, its value is 0.86, the minimum size of-0.88, located in the top of the middle region.