Effects of non-isotropic blockage on a tidal turbine modeled with the Actuator-Line method
This paper presents a study on the effects of non-isotropic blockage on a tidal turbine using numerical simulations. A tidal rotor was modeled with OpenFOAM using the Actuator-Line method under four different blockage ratios, four different aspect ratios, and four different tip-speed ratios. The s...
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| Language: | English |
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European Wave and Tidal Energy Conference
2025-06-01
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| Series: | International Marine Energy Journal |
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| Online Access: | https://marineenergyjournal.org/imej/article/view/221 |
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| author | Enzo Mascrier Federico Zilic de Arcos Grégory Pinon |
| author_facet | Enzo Mascrier Federico Zilic de Arcos Grégory Pinon |
| author_sort | Enzo Mascrier |
| collection | DOAJ |
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This paper presents a study on the effects of non-isotropic blockage on a tidal turbine using numerical simulations. A tidal rotor was modeled with OpenFOAM using the Actuator-Line method under four different blockage ratios, four different aspect ratios, and four different tip-speed ratios. The study analyzes the blade-boundary interactions through observations on the rotor integrated loads and power, sectional forces, local angles of attack, and turbine wake characteristics. The simulations reveal that, while reducing aspect ratios (i.e., bringing the boundaries closer to the rotor) has a negative impact on performance at low blockage, increasing blockage reduces the influence of aspect ratio on time-averaged thrust and power. However, the changes in aspect ratio can result in significant thrust and power fluctuations in time, especially at blade sections close to the tip. On a local scale, the impact of aspect ratio is observed on angles of attack changes due to flow acceleration, especially close to the blade tip. The effects of blockage and aspect ratio can also be observed in the development of the turbine wake. The presence of boundaries limits the expansion of thee wake and its interaction with the surrounding velocity field, affecting wake recovery
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| format | Article |
| id | doaj-art-912b0f49b8c84befa8c6cdeb021a2105 |
| institution | OA Journals |
| issn | 2631-5548 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | European Wave and Tidal Energy Conference |
| record_format | Article |
| series | International Marine Energy Journal |
| spelling | doaj-art-912b0f49b8c84befa8c6cdeb021a21052025-08-20T02:36:58ZengEuropean Wave and Tidal Energy ConferenceInternational Marine Energy Journal2631-55482025-06-018110.36688/imej.8.109-117Effects of non-isotropic blockage on a tidal turbine modeled with the Actuator-Line methodEnzo Mascrier0Federico Zilic de Arcos1Grégory Pinon2Laboratoire Ondes et Milieux Complexes - Normandie Univ, UNIHAVRE, CNRS, Le Havre, FranceDepartment of Engineering Science, University of Oxford, Oxford, United KingdomLaboratoire Ondes et Milieux Complexes - Normandie Univ, UNIHAVRE, CNRS, Le Havre, France This paper presents a study on the effects of non-isotropic blockage on a tidal turbine using numerical simulations. A tidal rotor was modeled with OpenFOAM using the Actuator-Line method under four different blockage ratios, four different aspect ratios, and four different tip-speed ratios. The study analyzes the blade-boundary interactions through observations on the rotor integrated loads and power, sectional forces, local angles of attack, and turbine wake characteristics. The simulations reveal that, while reducing aspect ratios (i.e., bringing the boundaries closer to the rotor) has a negative impact on performance at low blockage, increasing blockage reduces the influence of aspect ratio on time-averaged thrust and power. However, the changes in aspect ratio can result in significant thrust and power fluctuations in time, especially at blade sections close to the tip. On a local scale, the impact of aspect ratio is observed on angles of attack changes due to flow acceleration, especially close to the blade tip. The effects of blockage and aspect ratio can also be observed in the development of the turbine wake. The presence of boundaries limits the expansion of thee wake and its interaction with the surrounding velocity field, affecting wake recovery https://marineenergyjournal.org/imej/article/view/221Tidal EnergyAnisotropic BlockageActuator line methodCFD |
| spellingShingle | Enzo Mascrier Federico Zilic de Arcos Grégory Pinon Effects of non-isotropic blockage on a tidal turbine modeled with the Actuator-Line method International Marine Energy Journal Tidal Energy Anisotropic Blockage Actuator line method CFD |
| title | Effects of non-isotropic blockage on a tidal turbine modeled with the Actuator-Line method |
| title_full | Effects of non-isotropic blockage on a tidal turbine modeled with the Actuator-Line method |
| title_fullStr | Effects of non-isotropic blockage on a tidal turbine modeled with the Actuator-Line method |
| title_full_unstemmed | Effects of non-isotropic blockage on a tidal turbine modeled with the Actuator-Line method |
| title_short | Effects of non-isotropic blockage on a tidal turbine modeled with the Actuator-Line method |
| title_sort | effects of non isotropic blockage on a tidal turbine modeled with the actuator line method |
| topic | Tidal Energy Anisotropic Blockage Actuator line method CFD |
| url | https://marineenergyjournal.org/imej/article/view/221 |
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