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Open AccessArticle

Incorporation of a Non-Constant Thrust Force Coefficient to Assess Tidal-Stream Energy

by Lilia Flores Mateos 1,2,3,*,† and Michael Hartnett 1,2,3,†
1
College of Engineering and Informatics, NUI Galway, H91TK33 Galway, Ireland
2
Ryan Institute, NUI Galway, H91TK33 Galway, Ireland
3
Centre for Marine and Renewable Energy Ireland (MaREI), P43C573 Cork, Ireland
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Energies 2019, 12(21), 4151; https://doi.org/10.3390/en12214151
Received: 16 September 2019 / Revised: 22 October 2019 / Accepted: 25 October 2019 / Published: 31 October 2019
(This article belongs to the Special Issue Renewable Energy Resource Assessment and Forecasting)
A novel method for modelling tidal-stream energy capture at the regional scale is used to evaluate the performance of two marine turbine arrays configured as a fence and a partial fence. These configurations were used to study bounded and unbounded flow scenarios, respectively. The method implemented uses turbine operating conditions (TOC) and the parametrisation of changes produced by power extraction within the turbine near-field to compute a non-constant thrust coefficient, and it is referred to as a momentum sink TOC. Additionally, the effects of using a shock-capture capability to evaluate the resource are studied by comparing the performance of a gradually varying flow (GVF) and a rapidly varying flow (RVF) solver. Tidal-stream energy assessment of bounded flow scenarios through a full fence configuration is better performed using a GVF solver, because the head drop is more accurately simulated; however, the solver underestimates velocity reductions due to power extraction. On the other hand, assessment of unbounded flow scenarios through a partial fence was better performed by the RVF solver. This scheme approximated the head drop and velocity reduction more accurately, thus suggesting that resource assessment with realistic turbine configurations requires the correct solution of the discontinuities produced in the tidal-stream by power extraction. View Full-Text
Keywords: tidal-stream energy; thrust force coefficient; momentum sink; unbounded flow; open channel flows; shock-capturing capability tidal-stream energy; thrust force coefficient; momentum sink; unbounded flow; open channel flows; shock-capturing capability
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MDPI and ACS Style

Flores Mateos, L.; Hartnett, M. Incorporation of a Non-Constant Thrust Force Coefficient to Assess Tidal-Stream Energy. Energies 2019, 12, 4151.

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