Berends, Erik E. (2021) Scaling Effects and Validation of the Ocean Grazer Experimental Wave Tank using CFD. Master's Thesis / Essay, Mechanical Engineering.
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Abstract
The goal of this thesis was to investigate whether the Ocean Grazer experimental wave tank can create adequate environments for future testing and validation experiments. The research was performed by developing a full-scale numerical model of the experimental wave tank in OpenFOAM. The study focuses on the observed average wave amplitude and reflection. Multiple cases are presented to investigate the spectrum of waves that is able to be generated, as well as methods to mitigate the reflection at the beach of the wave tank. One of the main findings was that the wave tank was found to be too shallow to generate relevant deep water waves. Its beach was found to be too short for optimal wave absorption for long waves. Furthermore, a partial standing wave was observed to form in every generated wave case as the most dominant form of reflection. The wavelength of the partial standing wave was found to be half the generated waves’ wavelength. It was found that the reflection suppresses the average wave amplitude and that the reflection was found to be wave specific and dependent on the wavelength. However, the ability to mitigate the reflection was shown by the implementation of foam layers. The reflection was shown to reduce dramatically, increasing the average wave height. Denser and thicker foams were shown to perform best. Finally, some recommendations were made to improve the performance of the wave tank for future validation and testing experiments.
| Item Type: | Thesis (Master's Thesis / Essay) |
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| Supervisor name: | Vakis, A. and Prins, W.A. |
| Degree programme: | Mechanical Engineering |
| Thesis type: | Master's Thesis / Essay |
| Language: | English |
| Date Deposited: | 13 Jul 2021 11:30 |
| Last Modified: | 13 Jul 2021 11:30 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/25211 |
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