Model tests of a tlp floating offshore wind turbine with a porous outer column

Ed Mackay, Lars Johanning, Wei Shi, Dezhi Ning

Research output: Chapter in Book/Report/Conference proceedingConference proceedings published in a bookpeer-review

Abstract

This paper presents the results of scaled model tests of a tension leg platform (TLP) for a floating wind turbine, comprising a central solid cylinder with a porous outer cylinder. Tests were conducted with outer cylinders with porosities of 0%, 15% and 30% and compared to a base case with no outer cylinder. For each configuration, the total mass and centre of mass are kept constant to allow consistent comparison. It is shown that for the cases with a solid outer cylinder the surge motion resonance is shifted to a lower frequency due to the entrained mass of water inside and increased added mass of the outer cylinder. Increasing the porosity of the outer cylinder is shown to increase the frequency of the resonant response, bringing the resonant frequency closer to that of the base case with no outer cylinder. Increasing the porosity of the outer cylinder also reduces the amplitude of the resonant response. The use of a porous outer layer increases the quadratic drag on the body and significantly reduces the low frequency resonant response where the radiation damping is low.

Original languageEnglish
Title of host publication30th International Ocean and Polar Engineering Conference
PublisherInternational Society of Offshore and Polar Engineers
Pages308-316
Number of pages9
ISBN (Electronic)9781880653845
Publication statusPublished - 2020
Event30th International Ocean and Polar Engineering Conference, ISOPE 2020 - Virtual, Online
Duration: 11 Oct 202016 Oct 2020

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
Volume2020-October
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Conference

Conference30th International Ocean and Polar Engineering Conference, ISOPE 2020
CityVirtual, Online
Period11/10/2016/10/20

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

Keywords

  • Floating Offshore Wind Turbine
  • Hydrodynamic Response
  • Motion Damping
  • Renewable Energy

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