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Publications
Schay, J., Bhattacharjee, J. and Guedes Soares, C. (2013), Numerical modelling of a heaving point absorber in front of a vertical wall, 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2013), Nantes, France, OMAE2013-11491. ISBN: 978-0-7918-5542-3
In the present study, hydrodynamic performance of a heaving point absorber as a wave energy converter near a large body is studied through numerical modeling. The frequency domain analysis is performed in the three dimensional Cartesian coordinate system with the assumptions of linear wave theory. First the study is performed for individual point absorber in the absence of large structure in the vicinity of the floater and the results are compared with the results available in the literature. Next, the performance of a point absorber floating in the vicinity of a large body, which is considered as a fixed vertical wall, is investigated. The efficiency of the power absorption in regular and irregular seas is examined based on different floater sizes, floater shapes, drafts, wave heading angle and positioning of the floater. Two different buoy geometries are considered for the floating point absorber: a cone cylinder with an apex angle of 900 and a cylinder with a hemispherical bottom. For each of the buoy shapes, two different diameters and two different drafts are chosen for the analysis. Numerical simulations are based on hydrodynamic forces and coefficients, which are obtained from the commercial software WAMIT. The underwater body surface of the floaters is represented by small quadrilateral panels, which are described by the coordinates of each vertex.. The wave climate chosen for the present work represents the Portuguese west coast. The external damping due to the power take off (PTO) is chosen to match the hydrodynamic damping coefficient. Details of the results will be discussed in the main article.
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