Analysis of dynamics stability of curved pipes transporting fluid based on ANSYS secondary development

The vibration equations and finite element analysis model of the curved pipes conveying fluid are constructed and the dynamics of curved pipes under the boundary conditions of cantilever pipe are investigated also.By UPF of ANSYS,defining a user curved pipe element and solving eigenvalue.the law which how fluid velocities affect the characteristic frequencies of curved pipes are obtained,the stability of curved pipes is also studied at the same time and the critical velocities are obtained.The results show that user defined element is accurate.