B3 - Moorings, anchors and foundations

B - Fluid-structure Seabed Interaction

Status - published
Last updated on: 07/02/2020

Challenges/Opportunities

Foundation and station-keeping systems are a major fraction of ORE system costs and critical to system response.

Solution

Novel and higher performance mooring arrangements, lines, foundations and anchor systems will reduce the costs of support and station keeping, and optimise the dynamic response of wave devices

Context And Need

Importance

For all ORE systems, multiple devices and the connecting electrical infrastructure require support or station keeping. Station-keeping requires systems of mooring lines and anchor or foundation types for a range of bed conditions. Fixed devices require foundations that provide adequate strength and stiffness. Design methods have been developed for a range of water depths, aided by knowledge transfer from other offshore engineering sectors. However, typically, the mooring and foundation systems will comprise a significant fraction of the total system costs, particularly in deeper water. Reducing these infrastructure costs is important for overall cost reduction.

Breakthrough

Likely to require: new materials, better modelling approaches to capture the integrated behaviour of the mooring system with the floating structure, new foundation types particularly for high-energy environments.

Summary

New concepts and materials for moorings; design of coupled mooring and foundation systems and coupling mooring analysis and hydrodynamics for floating offshore wind and wave devices. Mooring systems for arrays including shared moorings and systems with multiple devices per foundation

Impact Potential

The mooring and foundation system can be a significant part of a fixed or floating structure, in shallow water, but as water depths increase these costs generally increase significantly. Deployment of wave and tidal systems is contingent on a suitable anchoring / foundation system. Self-installing systems or novel ideas may be needed to reduce costs.

Research Status

There has been significant research completed worldwide on mooring and foundation systems for fixed and floating oil and gas structures. This research should be leveraged for ORE. Recent work on anchoring includes work on driven pile design (e.g. PISA, ALPACA) as well as on screwpile design (Supergen Wind funded project).

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Active research projects:

  • FLOTANT (Innovative, low cost, low weight and safe floating wind technology optimized for deep water wind sites): The main objective of FLOTANT is the development of innovative solutions to improve the robustness and cost-efficiency of 10+MW wind turbine generators in deep waters (100-600m). This goal will be achieved through the design and test of specific components, as well as the assessment and optimisation of the construction, installation, operation and decommissioning techniques, in line with state-of-the-art practices and environmental constraints http://flotantproject.eu/


Previous research includes:

  • Development of screw anchors for floating Marine Renewable Energy system arrays incorporating anchor sharing

This project investigated the use of screw anchors for ORE applications (wind, wave, tidal). Results combine centrifuge modelling and FE analyses to calculate the anchor capacity, incorporating some installation effects. A simplified design method has been developed to fast assess the anchor capacity and optimise its geometry. https://cordis.europa.eu/proje...

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We would also like to invite UK researchers and industry stakeholders within ORE to submit links to research projects, both past and present, for inclusion within the landscape.

Therefore, if you have a UK-based research project within an area of ORE that you feel is relevant to a specific research theme or challenge within the Research Landscape, click HERE to submit your research project to the research landscape

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