0
research-article

PROTOTYPE REYNOLDS NUMBER VIV TESTS ON A FULL-SCALE RIGID RISER

[+] Author and Article Information
Decao Yin

SINTEF Ocean, Trondheim, NO-7052, Norway
decao.yin@sintef.no

Halvor Lie

SINTEF Ocean, Trondheim, NO-7052, Norway
halvor.lie@sintef.no

Rolf Baarholm

STATOIL, Stjørdal, NO-7500, Norway
rolbaa@statoil.com

1Corresponding author.

ASME doi:10.1115/1.4037538 History: Received April 27, 2017; Revised July 26, 2017

Abstract

Slender offshore structures in deep water subjected to currents may experience vortex-induced vibrations (VIV), which can cause significant fatigue damage. Extensive experimental researches have been conducted to study the VIV in the past several decades. However, most of the experimental works have small-scale models and relatively low Reynolds number (Re) - "subcritical' or even lower Reynolds number regime. There is a lack of full understanding the VIV in prototype Re flow regime. Applying the results with low Re to a full scale riser with prototype Re might have uncertainties due to the scaling effects. In addition, the surface roughness of the riser is also an important parameter, especially in prototype Re regime. In present study, two full-scale rigid riser models with different surface roughness ratios were tested in the towing tank of MARINTEK in 2014. Stationary tests, pure cross-flow (CF) free oscillation tests and forced/controlled motion tests were carried out. Several conclusions could be made: 1) The drag coefficient is dependent on the Re number and surface roughness ratio, 2) At critical and supercritical flow regimes, the displacement amplitude ratio is less sensitive to Re than that at lower Re. The displacement amplitude ratio in subcritical flow regime is significantly larger than that in critical and supercritical flow regimes, and 3) Two excitation regions for the 'smooth riser' and one excitation region for the 'rough riser' are identified.

Copyright (c) 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In