Two-phase Flow Induced Vibration of Subsea Span Pipeline

摘要

Flow Induced Vibration (FIV) caused by interacting internal flow in the subsea spanning pipeline, which is one of the important phenomena that contribute to failure of pipelines, especially when the internal flow pattern forms slug flow. A “two-way coupling” fluid-structure interaction (FSI) analysis of piping vibration and response is recommended. By using the general finite element (FE) code ANSYS CFX and ANSYS Mechanical, this paper discusses the procedure for FSI analysis of the span pipeline model conveying gas-water two-phase flow with two fixed ends, analyzes the dynamic behavior of the vibration induced by the internal flow, in different velocities of the two-phase flow and different volume fraction values. In addition, this FSI study compares the natural frequencies of the pipelines with the structural system vibration frequencies and consequently obtains the stress range, in the meanwhile to assist to predict and prevent flow induced vibration in pipelines.