Assessment of the parametric roll behaviour of a point absorber wave energy conversion device in irregular waves.
Citation:
Kevin R. Tarrant & Craig Meskell, Assessment of the parametric roll behaviour of a point absorber wave energy conversion device in irregular waves., VII International Conference on Computational Methods in Marine Engineering, Nantes, France, 15-17 May, 2017, Michel Visonneau, Patrick Queutey and David Le Touzé, 2017, 732 - 642Download Item:
Abstract:
The response of the Wavebob wave energy conversion device has investigated
numerically in long crested irregular waves generated using the JONSWAP wave spectrum.
Only long crested waves are considered as the roll mode will not be directly excited by the
incident wave since the device is axisymmetric. As a result all roll response is due to mode
coupling associated with parametric roll. The simulations were conducted at 17th scale to allow
direct comparison with the regular wave case. The simulations were conducted for a significant
wave height of 0.2m and a range of wave peak periods. The response of the device is simulated
at each condition for 2000 seconds of simulated time. In all conditions, it was found that there
was a significant roll response at the roll natural frequency for all wave excitation frequencies,
including excitation frequencies outside the main zones of parametric resonance, even though
the roll mode is not directly excited in long crested waves. It is concluded that there will always
be some level of parametric excitation in irregular waves due to broadband excitation. At the
tuning factor of 2, there are sudden bursts of roll motion due to parametric roll, however the
large roll amplitudes are not sustained as they were in regular waves with parametric resonance.
Author's Homepage:
http://people.tcd.ie/cmeskell
Author: Meskell, Craig
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VII International Conference on Computational Methods in Marine EngineeringType of material:
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