All ETDs from UAB

Advisory Committee Chair

Roy P Koomullil

Advisory Committee Members

Hessam Taherian

Lee Moradi

Document Type

Thesis

Date of Award

2018

Degree Name by School

Master of Science in Mechanical Engineering (MSME) School of Engineering

Abstract

ABSTRACT Vortex shedding is an oscillating flow behind blunt bodies when fluid flows past it. One of the consequences of vortex shedding is the vortex-induced vibrations (VIV), which happens in numerous engineering structures such as bridge, heat exchangers, marine cables, electrical power lines, and risers in petroleum production. A critical application of VIV is the risers used in petroleum industries, which connects between sea surface and sea base. A failure of risers and platforms can result in enormous economic and catastrophic environmental problems. Therefore, understanding VIV is essential to estimate fatigue damage of the offshore systems. This thesis describes a computational approach to analyze VIV of a flexible riser in a uniform current using a fluid-structure interaction (FSI) approach. Different components of the ANSYS/Fluent software suite are used to analyze this problem. This computational approach is validated using the experimental data on a flexible riser tested at the MARINTEK by ExxonMobil Upstream Research Company (URC). The computed root mean square (RMS) values of the amplitude of vibrations in the in-line (IL) and cross-flow (CF) directions are compared with the experimental data, and they are found to be in good agreement with each other. This validated model could be used for the estimation of the effectiveness of VIV suppression systems for flexible risers. Keywords: Fluid-structure interaction (FSI), Vortex-induced vibration (VIV), Suppression, Riser, Computational fluid dynamics (CFD)

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