Air–water two-phase flow modelling of hydrodynamic performance of an oscillating water column device

Zhang, Yali; Zou, Qingping; Greaves, Deborah

doi:10.1016/j.renene.2011.10.011

Cited by 177 publications

(68 citation statements)

References 16 publications

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“…This technique, used to simulate the PTO effect upon the OWC, was previously applied by Refs. [8,18,19] successfully. The advantage of using CFD numerical results for the OWC performance is to take into account viscous losses in the energy transfer made from the waves to the OWC.…”

Section: Introductionmentioning

confidence: 96%

Non-dimensional analysis for matching an impulse turbine to an OWC (oscillating water column) with an optimum energy transfer

Pereiras

López

Ruíz

et al. 2015

Energy

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Section: Introductionmentioning

confidence: 96%

Non-dimensional analysis for matching an impulse turbine to an OWC (oscillating water column) with an optimum energy transfer

Pereiras

López

Ruíz

et al. 2015

Energy

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“…However, if the purpose of the OWC structure is to reduce transmitted waves, vortex-induced energy loss is beneficial to the total energy dissipation and can improve the wave protection performance. To date, most of the studies of OWC focus on the energy extraction (e.g., [23][24][25][26][27][28][29]), and there have only been a few earlier studies touching upon the vorticity characteristics of OWC (e.g., [30][31][32]). Analytical and numerical studies based on potential theory are with certain limitation in dealing with viscous effects, while numerical studies based on viscous flow theory need experimental results for validation.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss

Huang

2016

Energies

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Integrating wave energy converters with breakwaters is a promising concept for wave energy utilization. On the basis of fulfilling the wave protection demands, pile-supported Oscillating Water Column (OWC)-type breakwaters can also meet the local needs of electricity far from the lands. In the present study, the wave energy extraction and vortex-induced energy loss of pile-supported OWC-type breakwaters were analyzed based on a two-point measurement method. The importance of energy extraction and vortex-induced energy loss on the wave energy dissipation of pile-supported OWC-type breakwaters were experimentally investigated. It was found that the trends of energy extraction and vortex-induced energy loss were generally correlated. The effects of the pneumatic damping induced by top opening affected the vortex-induced energy loss more than the energy extraction. Results showed that a larger pneumatic damping was preferable for the purpose of increasing energy extraction, whereas for a smaller pneumatic damping the vortex-induced energy loss was more important to the energy dissipation. With increasing draft, the energy extraction decreased, but the vortex-induced energy loss complementally contributed to the total energy dissipation and made the energy dissipation at the same level as that for a shallower draft.

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“…Senturk and Ozdamar (2011) analyzed a simplified theoretical model of the Japanese OWC device Kaimei and reported a deviation of up to 30% between the analytical solution and the numerical result for nozzle velocity. Zhang et al (2012) numerically replicated the experiments of Morris-Thomas et al (2007) and reported over prediction of the efficiency due to complex pressure changes in the chamber around resonance. It has to be noted that the use of a nozzle in an experiment is to simulate non-linear external damping and the nozzle width determines the amount of damping on the chamber.…”

Section: Introductionmentioning

confidence: 73%

Comparison of 2d and 3d Simulations of an Owc Device in Different Configurations

Kamath

Bihs

Arntsen

2014

Int. Conf. Coastal. Eng.

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The oscillating water column (OWC)device is a wave energy converter which converts the work done by the air column in a partially submerged pneumatic chamber into a electrical energy. This paper carries out numerical simulations using a computation fluid dynamics model to study the motion of the free surface inside the chamber in two different configurations of the device and also in two-and three-dimensions. It is observed that the 2D and 3D simulations provide the same results for the motion of the free surface and thus computationally cheaper 2D simulations can be employed to study the hydrodynamics of the OWC device. It is also observed that an asymmetrical device produces higher oscillation of the free surface in the chamber as it does not allow transmission of the wave across the device as in a symmetrical configuration.

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Air–water two-phase flow modelling of hydrodynamic performance of an oscillating water column device

Cited by 177 publications

References 16 publications

Non-dimensional analysis for matching an impulse turbine to an OWC (oscillating water column) with an optimum energy transfer

Non-dimensional analysis for matching an impulse turbine to an OWC (oscillating water column) with an optimum energy transfer

An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss

Comparison of 2d and 3d Simulations of an Owc Device in Different Configurations

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