Abstract:
The mechanical behavior of a high-pressure gas pipeline crossing a river bed was affected by many factors, and the change of the boundary conditions in the river bed was one of the important factors. Based on the theory of fluid dynamics and solid mechanics, the suspended gas pipeline impacted by high-speed flow was simulated by using finite element software FLUENT and ANSYS. When a river bed was varying, on the basis of summaring the variation law of the maximum stress and displacement of the suspended pipeline, we attained the critical suspended length of a high pressure gas pipeline under different flowing velocities. And the case study on the first trunk in a West-East gas pipeline project and the Sichua to Eastern China gas transmission pipeline are carried out, which would have some reference value to the routine maintaince of high pressure gas pipelines and the development of a flood resistance program.