Numerical model validation for mooring systems: Method and application for wave energy converters

Type Article
Date 2015-03
Language English
Author(s) Harnois V.1, Weller Sam D.1, Johanning L.1, Thies P. R.1, Le Boulluec Marc2, Le Roux Dominique2, Soule Veronique2, Ohana JeremyORCID2
Affiliation(s) 1 : Univ Exeter, Coll Engn Math & Phys Sci, Penryn TR10 9FE, Cornwall, England.
2 : IFREMER, F-29280 Plouzane, France.
Source Renewable Energy (0960-1481) (Pergamon-elsevier Science Ltd), 2015-03 , Vol. 75 , P. 869-887
DOI 10.1016/j.renene.2014.10.063
WOS© Times Cited 18
Keyword(s) Wave energy converter, Tank tests, Numerical model, Highly dynamic mooring system, Fibre rope
Abstract The design of wave energy mooring systems is challenging: overdesign incurs a significant cost penalty, underdesign may lead to a premature failure and incorrect design could reduce the power production. Consequently, compliant mooring systems are being developed for wave energy applications.
This paper presents tank test results for a scale model of the buoy and mooring used at the SouthWest Mooring Test Facility (SWMTF), an offshore facility developed to conduct long-term sea trials for wave energy device moorings. A compliant three leg catenary mooring system using Nylon ropes in the water column is investigated. Preliminary static, quasi-static, decay, regular and irregular wave tests were conducted on the 1:5 scale model, using the Ifremer basin in Brest. A corresponding numerical model was developed with a time-domain mooring modelling tool, inputting hydrodynamic data from a radiation/diffraction potential modelling program.
After the calibration of several hydrodynamic parameters, the numerical model demonstrated good agreement with the experiment. However, numerical results show large differences with the field test results, mainly because of unknowns in the anchor position. The methods and procedures presented will allow the effective validation of numerical models to enable the development of appropriate mooring systems in wave energy applications.
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