Study On Shape Coefficient Of Large Statue Building Based On CFD

Wind load is the main control load of large statue structures. Due to the irregular plane and elevation and uneven outer contour, statues’shape coefficient can not pick up from the current code. Currently a common practice is based on wind tunnel test. But this method is time-consuming and high cost. In this paper, based on the fundamental theory of CFD, using fluid dynamics software of Fluent 15.0, statistical analysis about The shape of the common large statue structure was conducted.The influence of different concave and convex degrees on the wind load shape coefficient of the statue under the condition of the same length and width ratio was studied. It is proposed to find the coefficient of the shape of the building by the typical plane subsection method.Secondly,Numerical wind tunnel simulation was carried out for Liu Bang statue,Huang Shi Yao Shi statue and Zheng chenggong statue, which was participated by the author in recent years.Thirdly, the results of the numerical simulation of the superposition method, the overall numerical simulation results, and the wind tunnel test results were compared. The reliability of the superposition method is evaluated. Finally, a set of calculation chart is proposed to calculate the wind load for the design staff.Through the above analysis, the following important conclusions are obtained:1. for the tall and slender column model, the plane shape has an important influence for he wind pressure distribution on its surface. It will Directly determine the number of shape coefficient. In addition, the length and width ratio of the cylinder can also affect the distribution of surface pressure.2, the column body of numerical wind tunnel calculation results show, RNG and SSTk-Omega, the two different turbulence model calculation results have little difference. But for the complex structure of the statue, the results have obvious differences. This shows that these two models have some errors and uncertainties in the computation of complex structures.3. the statue building under wind load, especially due to irregular shape and surface convex inequality. the surface pressure distribution is very complex. But these models still follow some general rules of flow around bluff body. After the wind blowing to the statue’s surface. a stagnation position will cause out. Its shape coefficient is around 1.0, and then the number will reduced to all around. On both sides of the image, the surface of the image can be separated by the liquid and the negative pressure region is generated. Shape coefficient can reach -3.5 to -5.5. At the back of the statue, the wind turbulence becomes more complex. For the standing statue, the figure is generally stable between -0.2 to -0.5.4, by comparing the typical plane figure coefficient with the integral numerical wind tunnel test and the Zheng Chenggong wind tunnel test result, it is feasible to estimate the shape coefficient of the statue structure by the method. It is suggested that the superposition method is used to determine the shape coefficient in the preliminary design stage of the structure of the statue, compared with Zheng Chenggong wind tunnel test results.it can be seen that the shape coefficient based on superposition method is slightly larger than the results of wind tunnel test.Therefore. the superposition method is also inclined to be safe.