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EFFECTIVE METHOD FOR DETERMINING ENVIRONMENTAL LOADS ON SUPPORTING STRUCTURES FOR OFFSHORE WIND TURBINES

Abstract

This paper presents a description of an effective method for determining loads due to waves and current acting on the supporting structures of the offshore wind turbines. This method is dedicated to the structures consisting of the cylindrical or conical elements as well as (truncates) pyramids of polygon with a large number of sides (8 or more). The presented computational method is based on the Morison equation, which was originally developed only for cylindrically shaped structures. The new algorithm shown here uses the coefficients of inertia and drag forces that were calculated for non-cylindrical shapes. The analysed structure consists of segments which are truncated pyramids on the basis of a hex decagon. The inertia coefficients, CM, and drag coefficients, CD, were determined using RANSE-CFD calculations. The CFD simulations were performed for a specific range of variation of the period, and for a certain range of amplitudes of the velocity. In addition, the analysis of influence of the surface roughness on the inertia and drag coefficients was performed. In the next step, the computations of sea wave, current and wind load on supporting structure for the fifty-year storm were carried out. The simulations were performed in the time domain and as a result the function of forces distribution along the construction elements was obtained. The most unfavourable distribution of forces will be used, to analyse the strength of the structure, as the design load.

Keywords:

offshore wind turbine, support structure, Morison force coefficients, CFD, sea wave statistics, Baltic Sea

Details

Issue
Vol. 23 No. 1(89) (2016)
Section
Latest Articles
Published
20-04-2016
DOI:
https://doi.org/10.1515/pomr-2016-0008
Licencja:
Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Open Access License

This journal provides immediate open access to its content under the Creative Commons BY 4.0 license. Authors who publish with this journal retain all copyrights and agree to the terms of the CC BY 4.0 license.

 

Authors

  • Paweł Dymarski

    Gdańsk University of Technology, Faculty of Ocean Engineering and Ship Technology
  • Ewelina Ciba

    Gdańsk University of Technology, Faculty of Ocean Engineering and Ship Technology
  • Tomasz Marcinkowski

    Maritime Institute in Gdansk

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