Numerical and experimental study on dynamic response of moored spar-type scale platform for floating offshore wind turbine

E.Y. Choi, J.R. Cho, Y.U. Cho, W.B. Jeong, S.B. Lee, S.P. Hong and H.H. Chun

Abstract

The dynamic response and the mooring line tension of a 1/75 scale model of spar-type platform for 2.5 MW floating offshore wind turbine subject to one-dimensional regular harmonic wave are investigated numerically and verified by experiment. The upper part of wind turbine which is composed of three rotor blades, hub and nacelle is modeled as a lumped mass the scale model and three mooring lines are pre-tensioned by means of linear springs. The coupled fluid rigid body interaction is numerically simulated by a coupled FEM-cable dynamics code, while the experiment is performed in a wave tank with the specially-designed vision and data acquisition system. The time responses of surge, heave and pitch motions of the scale platform and the mooring line tensions are obtained numerically and the frequency domainconverted RAOs are compared with the experiment.

Key Words

spar-type floating platform; scale model; response amplitude operator (RAO); mooring line tension; fluid-rigid body interaction simulation; wave tank experiment

Address

E.Y. Choi, J.R. Cho, Y.U. Cho, W.B. Jeong, S.B. Lee: School of Mechanical Engineering, Pusan National University, Busan 609-735, Korea S.P. Hong, H.H. Chun: Global Core Research Center for Ships and Offshore Plants, Pusan National University, Busan 609-735, Korea

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