A small scale experiment for multi-modal VIV response of a long flexible horizontal cylinder

Rudi Walujo Prastianto*, Koji Otsuka, Yoshiho Ikeda

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

Vibration response of a long flexible horizontal cylinder having pretension in water flow is very complex. Some phenomena which were still not clearly understood have been found in its motion behavior. This paper presents experimental results of a long flexible horizontal cylinder have been towed in still water which is free to respond in both, in-line and transverse directions. The length-to-diameter ratio of the test model was around 269 with a mass ratio of 1.7. Reynolds number varied from 9 × 102 up to 4.5 × 103. The model was positioned in two angles of 0 and 5 degree in horizontal plane which respect to the fluid flow. Pretension was applied to the test cylinder for towing speed of 0.1 up to 0.5 m/s in each case of the test. The motion data were recorded as digital image data using some CCD cameras and were analyzed using image processing technique. The frequencies of the CF (cross-flow) VIV response follow the Strouhal frequencies for a constant Strouhal number (St = 0.166) for both cylinder position, θ = 0 and θ = 5 degree respectively. It was found that multi-mode responses occurred at higher flow velocities. Further analysis will be done and additional results will be published later.

Original languageEnglish
Title of host publicationProceedings of The Seventeenth 2007 International Offshore and Polar Engineering Conference, ISOPE 2007
Pages2758-2763
Number of pages6
Publication statusPublished - 2007
Externally publishedYes
Event17th 2007 International Offshore and Polar Engineering Conference, ISOPE 2007 - Lisbon, Portugal
Duration: 1 Jul 20076 Jul 2007

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Conference

Conference17th 2007 International Offshore and Polar Engineering Conference, ISOPE 2007
Country/TerritoryPortugal
CityLisbon
Period1/07/076/07/07

Keywords

  • Image processing technique
  • In-line and cross-flow motion
  • Long flexible cylinder
  • Multi-modal vortex-induced vibration (VIV) response

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