Hydrodynamic performance analysis of a shore fixed oscillating water column wave energy converter in the presence of bottom variations
| Autor: | Piyush Mohapatra, Trilochan Sahoo |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Wave energy converter
Shore geography geography.geographical_feature_category Chemical substance business.industry 020209 energy Mechanical Engineering Oscillating Water Column Ocean Engineering 02 engineering and technology Mechanics Computational fluid dynamics 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Numerical wave tank business Power take-off Seabed Geology |
| Zdroj: | Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment. 234:37-47 |
| ISSN: | 2041-3084 1475-0902 |
| DOI: | 10.1177/1475090219864833 |
| Popis: | In this study, the effect of the stepped sea bed on the hydrodynamic performance of an oscillating water column device is investigated using computational fluid dynamics . This investigation is performed in a numerical wave tank modeled using ANSYS Fluent, which incorporates a transient, multiphase volume of fluid method to track the air–water interface. The power take-off unit is modeled as a porous zone in the flow field to produce the pressure jump versus flow characteristics that of a real air turbine. The efficiency of the chamber with and without the stepped bottom is analyzed and compared with known results in the literature. The flow parameters such as the temporal evolution and distribution of the pressure field, velocity field and free surface are studied to understand the performance of the proposed model. The study reveals that there is an improvement in hydrodynamic efficiency with the inclusion of the stepped bottom beneath the oscillating water column chamber, which is in agreement with the previous studies carried out using analytical and boundary integral equation methods. Moreover, the computational fluid dynamics model helps to understand the flow dynamics inside the oscillating water column chamber in a more intricate manner compared to the potential flow-based studies pursued in the literature. The formation of vortices within the oscillating water column chamber, near the front wall and stepped bottom could be captured, which affects the chamber performance to a certain extent. Overall, the study could be useful in the initial design stage of shore fixed oscillating water column devices. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|