Nonlinear and viscous effects on the hydrodynamic performance of a fixed OWC wave energy converter

Rong Quan Wang, De-Zhi Ning, Chong Wei Zhang, Qingping Zou, Zhen Liu

Research output: Contribution to journalArticle

Abstract

The hydrodynamic performance of a fixed Oscillating Water Column (OWC) device is experimentally and numerically investigated. Based on the time-domain higher-order boundary element method (HOBEM), by introducing an artificial viscosity term in the dynamic free surface boundary condition, a fully nonlinear numerical wave model is used to simulate the hydrodynamic performance of an OWC device. A set of comprehensive experiments for regular waves is carried out to validate the numerical results as well as to investigate the nonlinear effects on the hydrodynamic performance of OWC. The mechanism of the nonlinear phenomenon is investigated based on the analysis of the experimental and numerical results. The influence of the wave nonlinearity and the viscosity on the hydrodynamic efficiency is quantified by comparing the linear and nonlinear numerical results. It was found that the hydrodynamic efficiency increases with the nonlinearity and viscosity when the incident wave amplitude is small. When the incident wave amplitude is large, the hydrodynamic efficiency is reduced by the weakened transmission of the second-order harmonic wave component due to the strong wave nonlinearity. However, when the wave amplitude is between these two regimes, the wave is weakly nonlinear, the efficiency decreases with the wave amplitude due to the combined effect of the nonlinearity and viscosity.

Original languageEnglish
Pages (from-to)42-50
Number of pages9
JournalCoastal Engineering
Volume131
Early online date7 Nov 2017
DOIs
Publication statusPublished - Jan 2018

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Hydrodynamics
Water
Viscosity
Boundary element method
Boundary conditions

Keywords

  • Hydrodynamic performance
  • OWC
  • Viscosity
  • Wave energy converter
  • Wave nonlinearity

ASJC Scopus subject areas

  • Environmental Engineering
  • Ocean Engineering

Cite this

Wang, Rong Quan ; Ning, De-Zhi ; Zhang, Chong Wei ; Zou, Qingping ; Liu, Zhen. / Nonlinear and viscous effects on the hydrodynamic performance of a fixed OWC wave energy converter. In: Coastal Engineering. 2018 ; Vol. 131. pp. 42-50.
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Nonlinear and viscous effects on the hydrodynamic performance of a fixed OWC wave energy converter. / Wang, Rong Quan; Ning, De-Zhi; Zhang, Chong Wei; Zou, Qingping; Liu, Zhen.

In: Coastal Engineering, Vol. 131, 01.2018, p. 42-50.

Research output: Contribution to journalArticle

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