The objective of this study is to investigate the fully nonlinear interactions of wave-current and submerged bodies by a BEM-based numerical wave tank (NWT). In this paper, a new concept, a total velocity potential function (a combining form of a regular wave and a uniform current potential function), is adopted to solve the wave-current- body interaction problems. Two sets of the boundary integral equation (BIE) included velocity and local acceleration fields are adopted in order to find the surface wave forms and to calculate the hydrodynamic forces on the body. Applying the linear wave-current solution as a feeding function to the input boundary, it can generate waves similar to a wave maker. A numerical damping zone performed by Cointe(1990) is modified and deployed to dissipate the wave energy of the wave-current field near the end-wall and input boundary. Finally, both Mixed Eulerian-Lagrangian method (MEL) and Runge-Kutta 4th order scheme (RK4) are used to update the water elevation and velocity potential.
To prove the reliability of this study, a fully nonlinear NWT is established and examined by comparing the simulated results with other researches'. It shows well agreement with analytic solutions published by others. On the other hand, three different types of structures which are submerged circular cylinder, rectangular and dual-cylinder are adopted to investigate the effects of nonlinear interactions of wave-current-body. The simulated results in weak nonlinear effect show excellent agreement with the linear solutions. Therefore, we conclude that the current method adopting the total velocity potential in the wave-current-body interaction problems is very robust and stable, and lay a good foundation for the advanced ydrodynamic problems.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0117107-160731 |
| Date | 17 January 2007 |
| Creators | Wang, Chih-Tien |
| Contributors | Yang-Yih Chen, Chai-Cheng Huang, Tai-Wen Hsu, Yung-Chao Wu |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0117107-160731 |
| Rights | off_campus_withheld, Copyright information available at source archive |
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