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research-article

Prediction of Combined IL and CF VIV Response of Deepwater Risers

[+] Author and Article Information
Jie Wu

SINTEF Ocean, Trondheim, Norway
jie.wu@sintef.no

Malakonda Reddy Lekkala

Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, Stavanger, Norway
malakonda_17006151@utp.edu.my

Muk Chen Ong

Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, Stavanger, Norway
muk.c.ong@uis.no

Elizabeth Passano

SINTEF Ocean, Trondheim, Norway
elizabeth.passano@sintef.no

Per Erlend Voie

DNV GL, Trondheim, Norway
per.erlend.voie@dnvgl.com

1Corresponding author.

ASME doi:10.1115/1.4042072 History: Received October 10, 2017; Revised November 18, 2018

Abstract

Deepwater risers are susceptible to Vortex Induced Vibrations (VIV) when subjected to currents. When responding at high modes, fatigue damage the in in-line (IL) direction may become equally important as the cross-flow (CF) components. If a riser experiences directional currents, fatigue damage must be evaluated at several locations on the cross-section's circumference. Accurate calculation of both IL and CF responses are therefore needed. The purpose of the present paper is to provide a reliable combined IL and CF load model for the empirical VIV prediction programs. VIV prediction using the existing combined IL and CF load model in VIVANA is validated against selected flexible cylinder test data. A case study of a deepwater top tension riser (TTR) has been carried out. The results indicate VIV fatigue damage using 2D directional current profiles is less conservative compared to the traditional way of using uni-directional current profiles.

Copyright (c) 2018 by ASME
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