Numerical study of the Wavestar wave energy converter with multi-point-absorber around DeepCwind semisubmersible floating platform

Abstract

Abstract The presented paper numerically studies on the Wavestar wave energy converter (WEC) with multi-point-absorber around the DeepCwind semisubmersible floating platform. The Wavestar concept is selected as suitable point absorbers in conduction with floating wind turbine supported by DeepCwind semisubmersible. The effects of the Wavestars mechanism on the power extraction and DeepCwind semisubmersible movement were investigated using the potential flow-based boundary element method (BEM) in ANSYS/AQWA software in time domain for two different wave incident angles. The DeepCwind semisubmersible floating wind turbine design was simulated, and the results were compared with the available experimental data. Uncoupled simulations in which the response amplitude operator (RAO) motions and fairlead tensions are prescribed according to the experimental data show relatively good agreement in fairlead tensions. Finally, various numbers of the Wavestars WEC of point absorbers are mounted around the DeepCwind semisubmersible. The numerical results of the surge, heave and pitch motions, absorbed power and wave contour under multi-point-absorber are presented and discussed.