Moored multi-float wec m4 and hybrid with wind: Experiments and modelling

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Experiments have been undertaken to assess the performance of the six-float version of the moored multi-mode multi-float wave energy converter M4. Time-domain linear diffraction modelling slightly underestimates power capture except for larger wave periods. Without power take off the relative response and platform acceleration were quite linear with wave height up to extreme conditions. Converting to a hybrid wind-wave platform supporting a wind turbine on the central mid float with damping plates on the bow and mid floats reduced wave power capture to about 40%. The linear modelling approximately predicted motion and power with an overall drag coefficient of 6 for the plates and surprisingly with their added mass reduced to zero; this is thought to be due to the lift force from bound circulation for bodies in orbital flow opposing the inertia force. Accelerations at hub and hinge without PTO were approximately linear. This study concerns hydrodynamics only.

Bibliographical metadata

Original languageEnglish
Title of host publicationAdvances in Renewable Energies Offshore - Proceedings of the 3rd International Conference on Renewable Energies Offshore, RENEW 2018
EditorsC. Guedes Soares
PublisherCRC Press
Number of pages8
ISBN (Print)9781138585355
Publication statusPublished - 1 Jan 2019
Event3rd International Conference on Renewable Energies Offshore, RENEW 2018 - Lisbon, Portugal
Event duration: 8 Oct 201810 Oct 2018


Conference3rd International Conference on Renewable Energies Offshore, RENEW 2018