Vortex-induced-vibration of jack-ups with cylindrical legs in regular waves

Sudheesh Ramadasan, Longbin Tao, Arun Kr Dev

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Abstract

A simple mathematical model is developed based on the single-degree-of-freedom analogy and principle of conservation of energy evaluating various modes of Vortex-Induced-Vibration (VIV) of a jack-up with cylindrical legs in regular waves. Similar to uniform current, mass ratio, damping ratio and mode factor are found to be the important parameters controlling the cross-flow VIV and radius of gyration also for the yaw VIV. Criteria for the initiation of the mentioned VIV modes are developed for the cases of a single 2D cylinder experiencing planar oscillatory flow, four rigidly coupled 2D cylinders in rectangular configuration experiencing planar oscillatory flow and jack-up experiencing regular waves. The newly developed VIV model is validated by a set of experiments conducted in a wind, wave and current flume. The importance of mass damping parameter is further demonstrated in suppressing VIV in regular waves. The mathematical method will equip engineers to consider the effect of VIV due to regular waves in jack-up designs.

Original languageEnglish
Title of host publicationASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering
Subtitle of host publicationVolume 1: Offshore Technology; Offshore Geotechnics
Place of PublicationNew York
Number of pages13
DOIs
Publication statusPublished - 11 Nov 2019
Event38th International Conference on Ocean, Offshore & Arctic Engineering - Scottish Event Campus, Glasgow, United Kingdom
Duration: 9 Jun 201914 Jun 2019
Conference number: 2019
https://event.asme.org/OMAE

Conference

Conference38th International Conference on Ocean, Offshore & Arctic Engineering
Abbreviated titleOMAE
CountryUnited Kingdom
CityGlasgow
Period9/06/1914/06/19
Internet address

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Keywords

  • jack-up
  • VIV criteria
  • VIV suppression
  • vortex-induced-vibration (VIV)

Cite this

Ramadasan, S., Tao, L., & Dev, A. K. (2019). Vortex-induced-vibration of jack-ups with cylindrical legs in regular waves. In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering: Volume 1: Offshore Technology; Offshore Geotechnics New York. https://doi.org/10.1115/OMAE2019-95764