Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
DYNAMIC RESPONSE ANALYSIS OF STEEL CATENARY RISER UNDER THE INFLUENCE OF AN INTERNAL SLUG FLOW
Submission Author:
Joseph Arthur Meléndez Vásquez , SP
Co-Authors:
Juan Pablo Julca Avila, Joseph Arthur Meléndez Vásquez
Presenter: Joseph Arthur Meléndez Vásquez
doi://10.26678/ABCM.COBEM2017.COB17-0601
Abstract
Slug flow through marine risers is a frequent phenomenon that occurs during the production of oil and gas. The dynamic nature of the slug flow induces time-dependent forces on the steel catenary riser, thus affecting its structural dynamic response. The purpose of this work is a two-dimensional analysis of the structural dynamic response of steel catenary risers under the influence of an internal slug flow. To accomplish this goal, a computational tool is developed. The spatial discretization of the riser is performed using beam finite elements and the corotational approach is used for the two-dimensional formulation of the beam element. The beam elements have a linear elastic behaviour and they are submitted to large displacements, although with small deformations. The incremental-iterative Newton-Raphson scheme for follower loads is used to solve the equilibrium equations in static and dynamic analysis. Time domain numerical integration is performed using the constant average acceleration method. The slug flow is viewed as a single-phase fluid with variable density, which is modelled by a periodic function. It has been found that variations in slug flow frequencies has a higher impact on the response amplitude of the top tension at higher values of liquid mass flow.
Keywords
Corotational formulation, Slug Flow, Large Displacements, Structural dynamic response
