Numerical simulations of a 15MW wind turbine on a concrete TLP with rigid pipe tendons

Fabio Pierella*, Oscar Sainz Avila*, Clara Garcia Sanz, Abid Ashraf, Navarro Alonso Aitor, Taeseong Kim

*Corresponding author for this work

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Abstract

In this work, we analyze the stability of a concrete TLP platform with a square hull, designed for a 15 MW wind turbine. We verify the natural frequencies in the different degrees of freedom (DOFs) and two ultimate state design load cases (DLC) via two independent models, one in HAWC2+WAMIT from DTU and one in Orcaflex+AQWA from Bluenewables (BN). The decay tests show that the platform eigenfrequencies are outside of the main wave excitation range, and that the models predict the same natural periods within ±5%, with a maximum deviation 20% for the roll period (2.4 s vs. 2.23 s). In the ultimate load states (DLC 1.6 and 6.1), the platform motions are mainly driven by the wind and wave forcing. A small resonance is observed for the pitch motion, driven by the aerodynamic loads, and for the surge, driven by the difference-frequency components of the second-order wave excitation force. The tendons tension reaches a maximum of Nmax = 30 MN for DLC 6.1 (HS = 10.9 m, Tp = 14.0 s, Vref = 42.3ms−1). In both DLC 6.1 and DLC 1.6 the tendons are far from the compression limit, with a safety margin of ≈ 8 MN for the analyzed test cases.
Original languageEnglish
Title of host publicationEERA DeepWind Offshore Wind R&D Conference
Number of pages12
Volume2362
PublisherIOP Publishing
Publication date2022
Edition1
Article number012030
DOIs
Publication statusPublished - 2022
Event2022 EERA DeepWind Offshore Wind R&D Conference - Trondheim, Norway
Duration: 19 Jan 202221 Jan 2022

Conference

Conference2022 EERA DeepWind Offshore Wind R&D Conference
Country/TerritoryNorway
CityTrondheim
Period19/01/202221/01/2022
SeriesJournal of Physics: Conference Series
ISSN1742-6588

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