Variability of Kinetic Response Estimates of Froude Scaled DeepCwind Semisubmersible Platforms Subjected to Wave Loading

Author:

Wisudawan Agro1,Jaksic Vesna2,Pakrashi Vikram3,Murphy Jimmy1

Affiliation:

1. University College Cork Marine and Renewable Energy Ireland, Environmental Research Institute, , Beaufort Building, Ringaskiddy, Co., Cork P43 C573 , Ireland

2. Munster Technological University Department of Civil, Structural and Environmental Engineering, , Bishopstown Campus, Cork T12 P928 , Ireland

3. University College Dublin UCD Centre for Mechanics, Dynamical System and Risk Laboratory, School of Mechanical and Materials Engineering, , Dublin D04 V1W8 , Ireland

Abstract

Abstract Froude scaling for Floating Offshore Wind Turbine (FOWT) platforms is typical for understanding and interpreting their behavior and subsequent designs for testing in wave basins. Despite its popularity, the variability and uncertainty of the kinetic responses of such floating structures as a function of scaling require more attention. This work addresses the question of consistency of Froude scaling by comparing the hydrodynamic responses of a range of DeepCwind semisubmersible FOWT scaled models (full model, 1/2, 1/4, 1/9, 1/16, 1/25, 1/36, 1/49, and 1/50). The comparison was made both in the mooring-line tension and bending moment of structural members, which are directly related to their safety limit states. Hydrodynamic forces due to diffraction, radiation, and viscosity along with hydrostatic forces and mooring boundaries are modeled by ansys-Aqwa, which were subsequently converted to bending moment estimates. The variability of kinetic responses like mooring-line tensions and bending moment estimates was investigated for each scaled model, along with the identification of regions of inconsistencies. In the context of offshore renewable energy development through technological readiness levels, the study is especially pertinent for understanding how force variabilities and uncertainties are related to these kinetic responses of semisubmersible platforms.

Funder

Enterprise Ireland

Science Foundation Ireland

Sustainable Energy Authority of Ireland

Publisher

ASME International

Subject

Mechanical Engineering,Ocean Engineering

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