Numerical Simulation Study On The Shape Coefficient Of Wind Loads On Special Structures By CFD Theory

With the development of science and technology, space buildings is widely used because of beautiful shapes and various structural forms. The space building provides many advantages, including styling flexibility, light-weight, low cost, and be able to highlight human artistic creativity. But at the same time, the wind loading is still a problem in design.The wind load shape coefficient is one of the important content in the wind design of buildingsBased on the computational fluid dynamics (CFD) method, this paper studies the shape coefficient of wind load. According to engineering application, the author selects four kinds of different spatial structure shapes and builds many computation models for numerical analysis and comparison by using the large finite element analysis software ADINA. The selected four kinds of common spatial structure type belong to the ill-defined shape in national standard. The numerical simulation can obtain the distribution of wind load and shape coefficient. The calculation results by corresponding discussion and analysis put forward suggestions with practical value for engineering practice and related scientific research analysis.The main research contents of this paper include the following aspects:1. The paper fully talks about the research methods of the shape coefficient and the research status of wind engineering and CFD numerical simulation theory. In addition, the paper also introduces the background of the numerical simulation method and the main problems about the wind load of the special type spatial structure at present.2. the calculation of wind load shape coefficient and CFD numerical simulation method are described in detail. And it also describes the ADINA software for the element type selection and the grid division technology. Subsequently, the closed floor type arch roof structure was simulated with Les turbulence model, turbulent model and standard turbulence model. The simulation results prove that the turbulent model is more suitable for calculation in this paper. In addition, a closed double slope roof model with three slopes is established in this paper, and the influence of the structure parameters on the calculation of the shape coefficient is analyzed.3. The numerical simulation analysis of four kinds of spatial structures is described. The selected four kinds of common spatial structure include:elliptic cylinder, cone surface, torus and air corridor structure. In the numerical simulation analysis,this paper calculates the shape coefficient of wind load. In addition, it also discusses the influence of the structure vector cross ratio, longitudinal span ratio, span, tilting angle and other factors on the size of the coefficient distribution. At last, the paper gives the suggestions for the construction of various types of structures and the deficiencies in this paper. It provides a reference for the future engineering practice and application.