Influence of heave plates on the dynamics of a floating offshore wind turbine in waves

Abstract

This paper presents an analysis of the efects of heave plates with large skirts on the dynamics of a semi-submersible FOWT in waves. The analysis was based on a preliminary hull confguration envisaged for Brazilian waters. A numerical model based on linear frequency-domain hydrodynamics evaluated with panel methods was used for predicting the efects of the heave plates on the natural periods of motions. The predictions were compared to the results of model tests conducted in a wave basin involving ten diferent confgurations of plate diameters and skirt heights. The experimental results confrmed the validity of the numerical predictions and provided quantitative results regarding the variations in viscous damping associated with the dimensions of the heave plates. The data will be used for future calibration of a parametric model for hull geometry optimization.

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2020 – Mello et al – Infuence of heave plates on the dynamics of a foating ofshore wind turbine in waves

Keywords

FOWT dynamics, Heave plates, Seakeeping model tests

Authors

· Pedro C. Mello1
· Edgard B. Malta2
· Raíza O. P. da Silva1
· Matheus H. O. Candido1
· Lucas Henrique S. do Carmo1
· Izabela F. Alberto1
· Guilherme R. Franzini3
· Alexandre N. Simos1
· Hideyuki Suzuki4
· Rodolfo T. Gonçalves4

1 TPN, Numerical Ofshore Tank Laboratory, Department
of Naval Architecture and Ocean Engineering, Escola Politécnica, University of São Paulo, São Paulo, SP, Brazil

2 Technomar, Engenharia Oceânica, São Paulo, SP, Brazil

3 LMO, Ofshore Mechanics Laboratory, Department of Mechanical Engineering, Escola Politécnica, University of São Paulo, São Paulo, SP, Brazil

4 OSPL, Ocean Space Planning Laboratory, Department of Systems Innovation, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-Ku, Tokyo 113-8656, Japan