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Computational modelling and experimental tank testing of the multi float WaveSub under regular wave forcing / E. Faraggiana; C. Whitlam; J. Chapman; A. Hillis; J. Roesner; M. Hann; D. Greaves; Y.-H. Yu; K. Ruehl; Ian Masters; G. Foster; G. Stockman

Renewable Energy, Volume: 152, Pages: 892 - 909

Swansea University Author: Ian, Masters

  • Accepted Manuscript under embargo until: 2nd January 2021

Abstract

A submerged wave device generates energy from the relative motion of floating bodies. In 1 WaveSub, three floats are joined to a reactor; each connected to a spring and generator. Electricity generated 2 damps the orbital movements of the floats. The forces are non-linear and each float interacts wi...

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Published in: Renewable Energy
ISSN: 0960-1481
Published: Elsevier BV
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa53109
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Abstract: A submerged wave device generates energy from the relative motion of floating bodies. In 1 WaveSub, three floats are joined to a reactor; each connected to a spring and generator. Electricity generated 2 damps the orbital movements of the floats. The forces are non-linear and each float interacts with the others. 3 Tuning to the wave climate is achieved by changing the line lengths so there is a need to understand the 4 performance trade-offs for a large number of configurations. This requires an efficient, large displacement, 5 multidirectional, multi-body numerical scheme. Results from a 1/25 scale wave basin experiment are described. 6 Here we show that a time domain linear potential flow formulation (Nemoh, WEC-Sim) can match the tank 7 testing provided that suitably tuned drag coefficients are employed. Inviscid linear potential models can match 8 some wave device experiments, however, additional viscous terms generally provide better accuracy. Scale 9 experiments are also prone to mechanical friction and we estimate friction terms to improve the correlation 10 further. The resulting error in mean power between numerical and physical models is approximately 10%. 11 Predicted device movement shows a good match. Overall, drag terms in time domain wave energy modelling 12 will improve simulation accuracy in wave renewable energy device design.
Keywords: Renewable energy, Wave energy, Tank testing, Wave potential theory, Damping
Start Page: 892
End Page: 909