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Energies 2015, 8(12), 13521-13539;

Towards a Low-Cost Modelling System for Optimising the Layout of Tidal Turbine Arrays

College of Engineering & Informatics, National University of Ireland, Galway, University Road, Galway, Ireland
Marine Renewable Energy Ireland (MaREI), National University of Ireland, University Road, Galway, Ireland
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: John Ringwood
Received: 28 September 2015 / Revised: 6 November 2015 / Accepted: 16 November 2015 / Published: 30 November 2015
(This article belongs to the Special Issue Tools and Techniques for Economic Delivery of Ocean Energy)
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In the long-term, tidal turbines will most likely be deployed in farms/arrays where energy extraction by one turbine may significantly affect the energy available to another turbine. Given the prohibitive cost of experimental and/or field investigations of such turbine interactions, numerical models can play a significant role in determining the optimum layout of tidal turbine arrays with respect to energy capture. In the present research, a low-cost modelling solution for optimising turbine array layouts is presented and assessed. Nesting is used in a far-field model to telescope spatial resolution down to the scale of the turbines within the turbine array, allowing simulation of the interactions between adjacent turbines as well as the hydrodynamic impacts of individual turbines. The turbines are incorporated as momentum sinks. The results show that the model can compute turbine wakes with similar far-field spatial extents and velocity deficits to those measured in published experimental studies. The results show that optimum spacings for multi-row arrays with regard to power yield are 3–4 rotor diameters (RD) across-stream and 1–4 RD along-stream, and that turbines in downstream rows should be staggered to avoid wake effects of upstream turbines and to make use of the accelerated flows induced by adjacent upstream turbines. View Full-Text
Keywords: tidal turbines; modelling; hydro-environmental impacts; power output; optimising array layout tidal turbines; modelling; hydro-environmental impacts; power output; optimising array layout

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Nash, S.; Olbert, A.I.; Hartnett, M. Towards a Low-Cost Modelling System for Optimising the Layout of Tidal Turbine Arrays. Energies 2015, 8, 13521-13539.

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