Experimental and Numerical Comparisons of a Floating Absorber Wave Energy Converter in Regular Waves

2020 ◽  
pp. 697-706
Author(s):  
A. Novás-Cortés ◽  
L. Santiago-Caamaño ◽  
M. Miguez-González ◽  
V. Díaz-Casas
Keyword(s):  
Wave Energy ◽  
Wave Energy Converter ◽  
Regular Waves ◽  
Energy Converter ◽  
Numerical Comparisons

scholarly journals Experimental and numerical comparisons of a dual-flap floating oscillating surge wave energy converter in regular waves

2020 ◽  
Vol 196 ◽  
pp. 106575 ◽  
Author(s):  
Kelley Ruehl ◽  
Dominic D. Forbush ◽  
Yi-Hsiang Yu ◽  
Nathan Tom
Keyword(s):  
Wave Energy ◽  
Wave Energy Converter ◽  
Regular Waves ◽  
Energy Converter ◽  
Numerical Comparisons

Loads and Dynamic Response of a Floating Wave Energy Converter due to Regular Waves From CFD Simulations

2016 ◽  
Author(s):  
Anna Büchner ◽  
Thomas Knapp ◽  
Martin Bednarz ◽  
Philipp Sinn ◽  
Arndt Hildebrandt
Keyword(s):  
Dynamic Response ◽  
Boundary Conditions ◽  
Wave Energy ◽  
Single Point ◽  
Breaking Waves ◽  
Wave Energy Converter ◽  
Wave Loads ◽  
Regular Waves ◽  
Energy Converter ◽  
Set Up

The commercial CFD code ANSYS Fluent is used for the three-dimensional estimation of wave loads and the dynamic response of a floating single point wave energy converter of the SINN Power wave power plant due to non-breaking and unidirectional waves in coastal waters. The VoF method is used to model the free surface and wave theories to set up the boundary conditions at the inlet for regular waves. The wave induced vertical motions of the floating module are computed by a sixDoF solver. Preliminary 2D and 3D studies to set up boundary conditions, mesh densities and solver settings were performed. The numerical results were compared to analytical solutions in form of water surface elevations and wave kinematics which showed good agreement. The paper presents the dynamic response of the floating module for different load cases in terms of non-breaking waves. The resulting horizontal and vertical forces at the floating module will be presented and explained by the flow dynamics. Time and space depending velocities and pressure distributions including details on vortex separation will be given, which reveal valuable insights on the contribution of inertia and drag forces leading to the dynamic structural response of the floating devices.

Latching Control of an OWC Spar-Buoy Wave Energy Converter in Regular Waves

2012 ◽  
Author(s):  
J. C. C. Henriques ◽  
A. F. O. Falcão ◽  
R. P. F. Gomes ◽  
L. M. C. Gato
Keyword(s):  
Water Column ◽  
Wave Energy ◽  
Phase Control ◽  
Wave Energy Converter ◽  
Irregular Waves ◽  
Wave Direction ◽  
Regular Waves ◽  
Energy Converter ◽  
Chamber Volume ◽  
The Time Domain

The present paper concerns an OWC spar-buoy, possibly the simplest concept for a floating oscillating-water-column (OWC) wave energy converter. It is an axisymmetric device (and so insensitive to wave direction) consisting basically of a (relatively long) submerged vertical tail tube open at both ends, fixed to a floater that moves essentially in heave. The length of the tube determines the resonance frequency of the inner water column. The oscillating motion of the internal free surface relative to the buoy, produced by the incident waves, makes the air flow through a turbine that drives an electrical generator. It is well known that the frequency response of point absorbers like the spar buoy is relatively narrow, which implies that their performance in irregular waves is relatively poor. Phase control has been proposed to improve this situation. The present paper presents a theoretical investigation of phase control by latching of an OWC spar-buoy in which the compressibility of air in the chamber plays an important role (the latching is performed by fast closing and opening an air valve in series with the turbine). In particular such compressibility may remove the constraint of latching threshold having to coincide with an instant of zero relative velocity between the two bodies (in the case under consideration, between the floater and the OWC). The modelling is performed in the time domain for a given device geometry, and includes the numerical optimization of the air turbine rotational speed, chamber volume and latching parameters. Results are obtained for regular waves.

scholarly journals The power-capture of a nearshore, modular, flap-type wave energy converter in regular waves

2017 ◽  
Vol 137 ◽  
pp. 394-403 ◽  
Author(s):  
L. Wilkinson ◽  
T.J.T. Whittaker ◽  
P.R. Thies ◽  
S. Day ◽  
D. Ingram
Keyword(s):  
Wave Energy ◽  
Wave Energy Converter ◽  
Regular Waves ◽  
Energy Converter ◽  
Type Wave ◽  
Power Capture

scholarly journals CFD Simulations of Floating Point Absorber Wave Energy Converter Arrays Subjected to Regular Waves

Energies ◽  
2018 ◽  
Vol 11 (3) ◽  
pp. 641 ◽  
Author(s):  
Brecht Devolder ◽  
Vasiliki Stratigaki ◽  
Peter Troch ◽  
Pieter Rauwoens
Keyword(s):  
Wave Energy ◽  
Wave Energy Converter ◽  
Floating Point ◽  
Regular Waves ◽  
Energy Converter ◽  
Cfd Simulations ◽  
Point Absorber

A point absorber wave energy converter with nonlinear hardening spring power-take-off systems in regular waves

2020 ◽  
Vol 234 (4) ◽  
pp. 820-829
Author(s):  
Zhongqiang Zheng ◽  
Zhipeng Yao ◽  
Zongyu Chang ◽  
Tao Yao ◽  
Bo Liu
Keyword(s):  
Nonlinear Wave ◽  
Conversion Efficiency ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Linear Wave ◽  
Regular Waves ◽  
Energy Converter ◽  
Point Absorber ◽  
Frequency State ◽  
Nonlinear Hardening

Point absorber wave energy converter is one of the most effective wave energy harness devices. Most of the wave energy converters generate energy by oscillating the floating body. Usually, the power-take-off system is simplified as a linear spring and a linear damper. However, the narrow frequency bandwidth around a particular resonant frequency is not suitable for real vibrations applications. Thus, a nonlinear hardening spring and a linear damper are applied in the power-take-off system. The bandwidth of hardening mechanism is discussed. The dynamic model of wave energy converter is built in regular waves with time domain method. The results show that the nonlinear wave energy converter has higher conversion efficiency than the linear wave energy converter more than the natural frequency state. The conversion efficiency of the nonlinear wave energy converter in the low frequency state is closed to the linear converter. The amplitude of the incident wave, the damping of the nonlinear wave energy converter and the nonlinear parameter [Formula: see text] affect the energy capture performance of the wave energy converter.

scholarly journals Power Performance of the Combined Monopile Wind Turbine and Floating Buoy with Heave-type Wave Energy Converter

2019 ◽  
Vol 26 (3) ◽  
pp. 107-114
Author(s):  
Esmaeil Homayoun ◽  
Hassan Ghassemi ◽  
Hamidreza Ghafari
Keyword(s):  
Wind Turbine ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Dynamic Responses ◽  
Sea Waves ◽  
Power Performance ◽  
Regular Waves ◽  
Energy Converter ◽  
Damping Force ◽  
Type Wave

Abstract This study deals with a new concept of near-shore combined renewable energy system which integrates a monopile wind turbine and a floating buoy with heave-type wave energy converter( WEC). Wave energy is absorbed by power-take-off (PTO) systems. Four different shapes of buoy model are selected for this study. Power performance in regular waves is calculated by using boundary element method in ANSYS-AQWA software in both time and frequency domains. This software is based on three-dimensional radiation/diffraction theory and Morison’s equation using mixture of panels and Morison elements for determining hydrodynamic loads. For validation of the approach the numerical results of the main dynamic responses of WEC in regular wave are compared with the available experimental data. The effects of the heaving buoy geometry on the main dynamic responses such as added mass, damping coefficient, heave motion, PTO damping force and mean power of various model shapes of WEC in regular waves with different periods, are compared and discussed. Comparison of the results showed that using WECs with a curvature inward in the bottom would absorb more energy from sea waves.

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