Two-phase Flow Induced Vibration of Subsea Span Pipeline

摘要

Flow Induced Vibration (FIV) caused by interacting internal flow in thesubsea spanning pipeline, which is one of the important phenomena thatcontribute to failure of pipelines, especially when the internal flowpattern forms slug flow. A “two-way coupling” fluid-structureinteraction (FSI) analysis of piping vibration and response isrecommended. By using the general finite element (FE) code ANSYSCFX and ANSYS Mechanical, this paper discusses the procedure for FSIanalysis of the span pipeline model conveying gas-water two-phase flowwith two fixed ends, analyzes the dynamic behavior of the vibrationinduced by the internal flow, in different velocities of the two-phase flowand different volume fraction values. In addition, this FSI studycompares the natural frequencies of the pipelines with the structuralsystem vibration frequencies and consequently obtains the stress range,in the meanwhile to assist to predict and prevent flow induced vibrationin pipelines.