Asmuth, HenrikHenrikAsmuthSchmitt, PálPálSchmittElsäßer, BjörnBjörnElsäßerHenry, A.A.Henry2022-01-062022-01-062015Proceedings of the 1st International Conference on Renewable Energies Offshore, Lisbon, Portugal, 24-26 November 2014, RENEW 2014 (): 507-513 (2015)http://hdl.handle.net/11420/11406Linear 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.enTechnikIngenieurwissenschaftenConference Paper10.1201/b18973-71Other