Numerical Analysis For Internal Flow On The Stress Of Free Spanning Subsea Pipeline With Hinged Support

Free spanning subsea pipeline with internal oil or other liquid usually is coupling systems. The effect of deformation and frequency, as well as effective stress on pipeline caused by internal flow are researched in this paper. The 3-D fluid-structure interaction of submarine oil pipeline with hinged support and internal flow is numerically simulated by applying the iterative computation to the fluid-structure interfaces. The pipeline and internal flow are governed by the 3-D elasto-dynamic equation and N-S equation of laminar model respectively. The 18 nodes quadrilateral elements of shell model are used to the pipe wall and the 4 nodes tetrahedral elements are used to the internal flow in ADINA programmer. The effect of hydrostatic pressure is considered by distributing the pressure on the pipeline wall. The natural frequency of the system is calculated and compared with the theoretical solution of Housner' equation. The internal fluid features such as fluid velocity and fluid pressure distribution are given. The impact of internal flow on the stress of submarine pipeline with hinged support is discussed by changing span-length pipe diameter and internal flow velocity.