Pilot Model Tests on the ‘Green Water Concept’ for Wave Energy Conversion With Model Scale Power Take Off (PTO) Modelling

Buchner, Bas; Schaaf, Haite van der; Hoefakker, Koos

doi:10.1115/omae2010-20484

Cited by 2 publications

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“…The scale was 1:30 and the kyy=16.45m. Table 3 Main particulars Beside this, the following was modelled (see [11] for more details):…”

Section: Resultsmentioning

confidence: 99%

Model Tests and Simulations on a Wave Energy Converter Based on Inverse Offshore Engineering

Buchner¹

2010

Proceedings of Offshore Technology Conference

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This paper presents the initial simulations and model tests into the 'Green Water Concept' for wave energy conversion. Instead of reducing the motions and green water as is done in normal offshore hydrodynamics, the 'Green Water Concept' tries to maximise the motions and green water through 'inverse engineering' to generate electric energy from the waves. First, results are presented of frequency domain calculations for the motion (de-) optimisation. Second, pilot model tests on the 'Green Water Concept' are presented. These tests also included the initial modelling of an electric and hydraulic Power Take Off (PTO). The accurate modelling of a PTO is an important aspect in testing of wave energy conversion concepts numerically and in a wave tank: at the moment that energy is converted into electricity in the PTO, the hydrodynamic behaviour of the structure is changing. The tests confirmed the high motions and large amount of green water of the Green Water Concept as predicted in simulations. The application of a real PTO gave important insight in the possibilities and challenges of PTO modelling at model scale. For the present concept a mean Power (at full-scale) close to 1MW was generated in a regular wave of H=3.0m for the maximum possible setting in the chosen test set-up. This setting was limited by the chosen mechanical and electronic motor set-up in this pilot test series, not the actual maximum of the Green Water Concept itself. Considering the test results, it is clear that the potential of the system is significantly larger. Figure 1: The 'Green Water Concept' uses knowledge about ship motions to develop a wave energy device through 'inverse engineering' BackgroundWave energy is a concentrated form of wind energy: the wind transfers energy into the waves over a long fetch. Cruz [1] has estimated that Europe has an average wave power of 50kW per metre width of wave front [1]. Others [2] indicate that worldwide the economically exploitable amount of wave energy is estimated at 2,000 TWh/year, an average power of 200GW over a year. This is equivalent of 200 large power stations. The challenge is to generate a predictable amount of energy, in a reliable way, at a reasonable cost.

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“…The scale was 1:30 and the kyy=16.45m. Table 3 Main particulars Beside this, the following was modelled (see [11] for more details):…”

Section: Resultsmentioning

confidence: 99%

Model Tests and Simulations on a Wave Energy Converter Based on Inverse Offshore Engineering

Buchner¹

2010

Proceedings of Offshore Technology Conference

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Three-Dimensional Numerical and Experimental Simulation of Wave Run-Up Due to Wave Impact With a Vertical Surface

Bodaghkhani

Muzychka

Colbourne

2018

Journal of Fluids Engineering

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This paper describes a numerical simulation of the interaction of a single nonlinear wave with a solid vertical surface in three dimensions. A coupled volume of fluid (VOF) and level set method (LSM) is used to simulate the wave-body interaction. A Cartesian-grid method is used to model immersed solid boundaries with constant grid spacing for simplicity and lower storage requirements. Mesh refinement is implemented near the wall boundaries due to the complex behavior of the free surface around the body. The behavior of the wave impact, the water sheet, and the high-speed jet arising from the wave impact are all captured with these methods. The numerical scheme is implemented using parallel computing due to the high central processing unit and memory requirements of this simulation. The maximum wave run-up velocity, instant wave run-up velocity in front of the vertical surface, the sheet break-up length, and the maximum impact pressure are computed for several input wave characteristics. Results are compared with a laboratory experiment that was carried out in a tow tank in which several generated waves were impacted with a fixed flat-shaped plate model. The numerical and experimental data on sheet breakup length are further compared with an analytical linear stability model for a viscous liquid sheet, and good agreement is achieved. The comparison between the numerical model and the experimental measurements of pressure, the wave run-up velocity, and the break-up length in front of the plate model shows good agreement.

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Pilot Model Tests on the ‘Green Water Concept’ for Wave Energy Conversion With Model Scale Power Take Off (PTO) Modelling

Cited by 2 publications

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Model Tests and Simulations on a Wave Energy Converter Based on Inverse Offshore Engineering

Model Tests and Simulations on a Wave Energy Converter Based on Inverse Offshore Engineering

Three-Dimensional Numerical and Experimental Simulation of Wave Run-Up Due to Wave Impact With a Vertical Surface

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