![]() The focused wave will be created by generating multiple waves with varying celerities so that the peaks of each wave converge to form a larger wave. Accuracy of the focused wave is less important so long as the wave train converges to form a large wave within the test area. The performance of irregular wave generation will also be evaluated by comparing the shape of the measured wave spectrum to the commanded spectrum. Therefore it may be necessary to calculate more complicated motion profiles so that the piston motion matches the horizontal motion of water particles underneath the wave. The piston motion will at first be sinusoidal, however secondary waves may be an issue when generating large amplitude waves. To evaluate the performance of the wavemaker, regular waves will be generated using open loop control over a range of wave heights and frequencies within the intermediate and deep water regimes. (2008): ‘Wavemaker Control System for Irregular Developed Sea Waves Generation’. For irregular waves or other waveforms with multiple spectral components, piston motion will be calculated as described by Ivan Miskovic et al. Dalrymple (1984): ‘Water Wave Mechanics for Engineers and Scientists’. The motion of the wavemaker piston is calculated based on linear wavemaker theory described by Robert G. The current objective of the wavemaker is to accurately generate regular, irregular and focused waves. The width and height of the flume cross-section in the viewing area is 0.45m and 0.57m respectively In addition, the tank will be used to validate numerical models by comparing to test cases such as breaking waves and overtopping over a fixed deck. The system will allow small scale WEC concepts to be tested conveniently on campus. It now features a new larger actuator and a reinforced structure to improve the rigidity of the device. After recent mechanical upgrades, the small scale wavemaker is being reinstalled in the flume tank at UVic.
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