The unsteady fluid flow caused from the moving disc in an axial flow check valve was numerically simulated by means of the computational methods and flow physical models available in CFD codeFluent. The disc regularly instantaneous movement was realized by the dynamic mesh technique and UDF (user defined function) in Fluent. The transient pressure and velocity were obtained during a period of the disc being closed by means of unstructured mesh, the standard k-ε turbulence model. Those transient characteristic curves have been measured experimentally as well, and exhibit good agreement with the predicted ones, suggesting the numerical simulation method is reliable. Moreover, such dynamic characteristic curves were calculated in the valves in various nominal diameters and external forces and their influences have been identified. Those results will play a critical role in investigation into water hammer effect in the axial flow check valve, and might be useful for check valve design in engineering projects.
Li Zhifeng, Wu Dazhuan, Wang Leqing. Numerical simulation of transient flow past impulsively started circular cylinder based on dynamic mesh method[J].Journal of Zhejiang University: Engineering Science,2008,42(2):264-268.(in Chinese)