Three-Dimensional Numerical Simulation On Twin Chimney Stacks With Interference

As landmark building in the power plant architecture, the chimney has the characteristics of very high and large investment, belonging to the typical system of high-rise structure. With the development of the industry, the improvement of construction technology and the world to improve the environmental requirements, the number of chimney has increased to two or more, the height also has increased to 200 meters, even more than 300 meters, and the wind loading has become one of the dominated loading for structural design. Based on the existing research results, the flow interference existing in two or more chimney will largely change pressure distribution and wind-induce vibration when the chimney are in a certain distance.Because the diameter of chimney decreases with height, the thesis uses variable cross-section of cylinder model and computational fluid dynamics software Fluent to research aerodynamic interference of three-dimensional high Reynolds number twin chimney stacks.Firstly, the thesis briefly introduces the basic knowledge of computational fluid dynamics and computational fluid dynamics software Fluent. The best turbulent model for subsequent calculation is chosen by conducting three-dimensional numerical simulation of flow around a chimney and comparing the results of the single chimney in two Reynolds number and four different turbulence models with the results of ESDU-80025. Then flow around two chimneys at various spacing is numerically calculated to acquire the variation law of drag coefficients and pressure coefficients while the two chimneys are arranged in side-by-side and diagonal. Finally, the simulation of flow around side-by-side chimneys at different height was conducted to acquire the influence of chimney height on flow characteristics.