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Determination of non-linear damping coefficients of bottom-hinged oscillating wave surge converters using numerical free decay tests
Publikationstyp
Conference Paper
Date Issued
2015
Sprache
English
Author(s)
Institut
Start Page
507
End Page
513
Citation
Proceedings of the 1st International Conference on Renewable Energies Offshore, Lisbon, Portugal, 24-26 November 2014, RENEW 2014 (): 507-513 (2015)
Contribution to Conference
Publisher DOI
Scopus ID
Publisher
CRC Press
Linear wave theory models are commonly applied to predict the performance of bottom-hinged Oscillating Wave Surge Converters (OWSC) in operational sea states. To account for non-linear effects, the additional input of coefficients not included in the model itself becomes necessary. In ocean engineering it is common practice to obtain damping coefficients of floating structures from free decay tests. This paper presents results obtained from experimental tank tests and numerical computational fluid dynamics simulations of OWSC’s. Agreement between numerical and experimental methods is found to be very good, with CFD providing more data points at small amplitude rotations. Analysis of the obtained data reveals that linear quadratic-damping, as commonly used in time domain models, is not able to accurately model the occurring damping over the whole regime of rotation amplitudes. The authors conclude that a hyperbolic function is most suitable to express the instantaneous damping ratio over the rotation amplitude and would be the best choice to be used in coefficient based time domain models.
DDC Class
600: Technik
620: Ingenieurwissenschaften