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Non-linear CFD modelling of a submerged sphere wave energy converter

Citation

Bharath, A and Penesis, I and Nader, J-R and MacFarlane, G, Non-linear CFD modelling of a submerged sphere wave energy converter, Proceedings of the 3rd Asian Wave & Tidal Energy Conference, 24-28 October 2016, Singapore, pp. 320-329. ISBN 978-981-11-0782-5 (2016) [Refereed Conference Paper]


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Official URL: http://www.awtec.asia/awtec-2016/

Abstract

The use of wave energy converters (WECs) as a renewable source of energy is quickly becoming a reality with many prototype designs currently being tested at both model and full scale. Analytical and numerical modelling has been used extensively to predict the performance of these devices using linear, inviscid and irrotational theory as a basis. This work applies a non-linear, viscous volume of fluid RANS model to simulate the diffraction and radiation problems for a single heaving submerged spherical WEC. Two amplitudes of the incident wave and sphere oscillation are considered for three different frequencies. The amplitudes are chosen to correspond to both linear and non-linear wave forms. The results of the model are compared against those of a linear FEM based model with good agreement at small amplitudes. The hydrodynamic coefficients, considered constant under linear theory, are here found to be amplitude dependent as the oscillations become non-linear. Other non-linear effects to surface forces and fluid motions on and near the submerged sphere are also presented and discussed.

Item Details

Item Type:Refereed Conference Paper
Keywords:computational fluid dynamics, volume of fluid, wave diffraction, wave radiation, wave energy converters, free surface interactions
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ocean Engineering
Objective Division:Energy
Objective Group:Renewable Energy
Objective Field:Wave Energy
Author:Bharath, A (Mr Aidan Bharath)
Author:Penesis, I (Associate Professor Irene Penesis)
Author:Nader, J-R (Dr Jean-Roch Nader)
Author:MacFarlane, G (Associate Professor Gregor MacFarlane)
ID Code:112728
Year Published:2016
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2016-11-24
Last Modified:2017-11-01
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