Determination of Non-linear Damping Coefficients of bottom-hinged Oscillating Wave Surge Converters Using Numerical Free Decay Tests

Henrik Asmuth, Pal Schmitt, Alan Henry, Bjoern Elsaesser

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Abstract

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.
Original languageEnglish
Number of pages7
Publication statusPublished - 30 Nov 2014
EventRenew 2014 - Lisbon, Portugal
Duration: 24 Nov 201426 Nov 2014

Conference

ConferenceRenew 2014
CountryPortugal
CityLisbon
Period24/11/201426/11/2014

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Ocean Engineering

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