A modified free-wake vortex ring model for the aerodynamics of floating offshore wind turbines

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

A modified free-wake vortex ring model is proposed to compute the dynamics of a floating horizontal-axis wind turbine. The model is divided into two parts. The near wake model uses a blade bound vortex model and trailed vortex model, which is developed based on vortex filament method. By contrast, the far wake model is based on the vortex ring method. This is a good compromise between accuracy and computational cost. In this work, the model is used to assess the influence of floating platform motions on the performance of a horizontal-axis wind turbine rotor. The results are validated on the 5MW NREL rotor and compared with other vortex models for the same rotor subjected to different platform motions. It was found that the result from the proposed method are more reliable than the results from BEM theory especially at small angles of attack in the region of low wind speeds, on the one hand, and high wind speeds with blade pitch motions, on the other hand.

Original languageEnglish
Title of host publicationASME 2019 2nd International Offshore Wind Technical Conference, IOWTC 2019
PublisherASME
Number of pages10
ISBN (Electronic)9780791859353
DOIs
Publication statusPublished - 2019
EventASME 2019 2nd International Offshore Wind Technical Conference, IOWTC 2019 - St. Julian's, Malta
Duration: 3 Nov 20196 Nov 2019

Conference

ConferenceASME 2019 2nd International Offshore Wind Technical Conference, IOWTC 2019
CountryMalta
CitySt. Julian's
Period3/11/196/11/19

Keywords

  • Aerodynamic
  • Far wake
  • Free wake vortex method
  • Horizontal-axis wind turbine
  • Near wake
  • Wind energy

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