Deployment feasibility studies of variable buoyancy anchors for floating wind applications

Rodrigo Andres Martinez, Sergi Arnau Almirall, Callum Scullion, Paddy Collins, Richard Neilson, Marcin Kapitaniak* (Corresponding Author)

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

1 Citation (Scopus)


To study the feasibility of deploying a novel type of anchor with variable buoyancy for mooring floating offshore wind turbines, a set of detailed modelling studies was performed in the state-of-the-art, Marine Simulator at the National Decommissioning Centre (NDC). The aim of the multi-physics simulations is to fully assess the proposed deployment method using a small tugboat fitted with a simple winch, thereby simplifying the process and reducing installation costs. The anchor has a 10 m square base, 4.5 m height and weight of 163 tonnes. The anchor is subjected to irregular waves with a JONSWAP spectrum with a significant wave height up to 5 m and peak period of 10 s. The analysis is divided in three sections: characterisation of the anchor buoyancy, positioning the anchor under the stern of the vessel and the controlled descent of the anchor to the seabed. An ideal winch speed of 0.35 m/s is identified, at which working load range on the winch cable decreases from 80 kN at the lowest winch speeds to about 30 kN. The sinking trajectory is similar at all winch speeds, however, the slower the descent, the further the anchor drifts. At this winch velocity, the descent from the resting position under the stern to the seabed takes roughly 5 min. In addition, the anchor’s yaw range during the descent is below 10∘ at the optimal conditions.
Original languageEnglish
Title of host publicationRecent Trends in Wave Mechanics and Vibrations
Subtitle of host publicationInternational Conference on Wave Mechanics and Vibrations 2022
EditorsZ. Dimitrovová, P. Biswas, R. Gonçalves, T. Silva
Number of pages10
ISBN (Electronic)978-3-031-15758-5
ISBN (Print)978-3-031-15757-8
Publication statusPublished - 7 Oct 2022
EventWMVC 2022: 10th International Conference on Wave Mechanics and Vibrations - Lisbon, Portugal
Duration: 4 Jul 20226 Jul 2022
Conference number: 10th

Publication series

NameMechanisms and Machine Science
ISSN (Print)2211-0984
ISSN (Electronic)2211-0992


ConferenceWMVC 2022
Abbreviated titleWMVC 2022
Internet address


  • offshore wind
  • anchor dynamics
  • virtual pototyping


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