The coupled analysis of pipe burst and multi-components fluid of very high pressured natural gas pipe line

Abstract

The characteristics of high-pressured natural gas expanding in the pipeline are simulated by coupled analysis of fluid and structure. The opening pipe wall is analyzed by finite element method with classical combined hardening elasto-plastic theory. The governing equation of flowfield is two-dimensional compressible Euler equations. The equations are solved by Lax-Friedrich scheme with higher order extension by MUSCL approach. It is important to consider deformation of pipeline because decompression process is highly influenced by opening of pipe wall. In this study, the gas inside of pipe is considered as natural gas and the gas outside of pipe is considered as air. The influence of multicomponent gas to opening pipe wall is investigated.