Fully nonlinear analysis incorporating viscous effects for hydrodynamics of an oscillating wave surge converter with nonlinear power take-off system

Yong Cheng, Chunyan Ji and Gangjun Zhai

Energy, 2019, vol. 179, issue C, 1067-1081

Abstract: WaveRoller can be classified as an effective Oscillating wave surge converter (OWSC) installed in nearshore coastal areas. In this study, the hydrodynamic performance of a two-dimensional (2-D) WaveRoller is investigated based on a fully nonlinear time-domain higher-order boundary element method (HOBEM). The mechanism through which the wave power is extracted, is analyzed in a nonlinear power take-off (PTO) by coupling the time-varying motion of the flap and hydro-electric generator. A simplified Morison model is used to determine the viscosity term in the structural motion equation. The present model is validated against the published experimental and numerical results for an OWSC with its top edge piercing through the water surface. Numerical simulations are undertaken to investigate the mechanism of the nonlinear phenomenon including wave nonlinearity and PTO nonlinearity. The influence of the viscosity is also quantified by comparing the numerical results with and without the quadratic damping term. Numerical results indicate that when the incident wave amplitude is large, the capture efficiency is reduced by the strengthen higher order free wave components, and the PTO nonlinearity becomes more prominent. Furthermore, the maximum discrepancy induced by the viscosity occurs in the resonant zone.

Keywords: OWSC; Wave energy; HOBEM; Viscosity effects; Nonlinear PTO; Hydrodynamic efficiency (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S036054421930828X
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:179:y:2019:i:c:p:1067-1081

DOI: 10.1016/j.energy.2019.04.189

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().