Ocean Systems Engineering

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Numerical and experimental study on hydrodynamic performance of multi-level OWEC

  • Jungrungruengtaworn, Sirirat (Department of Maritime Engineering, Faculty of International Maritime Studies, Kasetsart University) ;
  • Reabroy, Ratthakrit (Department of Maritime Engineering, Faculty of International Maritime Studies, Kasetsart University) ;
  • Thaweewat, Nonthipat (Department of Maritime Engineering, Faculty of International Maritime Studies, Kasetsart University) ;
  • Hyun, Beom-Soo (Department of Naval Architecture and Ocean Systems Engineering, Korea Maritime and Ocean University)
  • Received : 2020.05.30
  • Accepted : 2020.10.19
  • Published : 2020.12.25
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Abstract

The performance of a multi-level overtopping wave energy converter (OWEC) has been numerically and experimentally investigated in a two-dimensional wave tank in order to study the effects of opening width of additional reservoirs. The device is a fixed OWEC consisting of an inclined ramp together with several reservoirs at different levels. A particle-based numerical simulation utilizing the Lattice Boltzmann Method (LBM) is used to simulate the flow behavior around the OWEC. Additionally, an experimental model is also built and tested in a small wave flume in order to validate the numerical results. A comparison in energy captured performance between single-level and multi-level devices has been proposed using the hydraulic efficiency. The enhancement of power capture performance is accomplished by increasing an overtopping flow rate captured by the extra reservoirs. However, a noticeably large opening of the extra reservoirs can result in a reduction in the power efficiency. The overtopping flow behavior into the reservoirs is also presented and discussed. Moreover, the results of hydrodynamic performance are compared with a similar study, of which a similar tendency is achieved. Nevertheless, the LBM simulations consume less computational time in both pre-processing and calculating phases.

Keywords

Acknowledgement

The authors would like to acknowledge Norawat Chareonthanavit, Patipan Boonchan, Wasuta Pannaphop, Setthawut Sukuma and Tanakorn Sa-nguansook for their contribution and generous supply of numerical and experimental data.

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