TY - GEN
T1 - MOTION CHARACTERISTICS of A FLOATING MODEL with MOONPOOLS for VAWTS
AU - Fujishima, Katsuhide
AU - Aida, Yasuhiro
AU - Lei, Tan
AU - Masuda, Koichi
N1 - Publisher Copyright:
© 2022 by ASME.
PY - 2022
Y1 - 2022
N2 - This paper describes motion behaviors of a floating body and water regions of moonpools. The floating model to be focused in this study has moonpools and is for offshore wind turbine system with two vertical axis wind turbines. Motion behaviors of water region in moonpools strongly affect on motion characteristics of a floating body itself. Often the effects lead to non-linear motion of the floating body. Besides, when the floating body is a system of vertical axis offshore wind turbines, the system becomes more complicated. This study conducted theoretical calculations and model experiments in a wave tank. Behaviors of moonpools were measured in regular waves and we measured wave exciting forces, radiation forces on heave and motion responses of the floating model. Also, the study considered effects of Vertical Axis Wind Turbine (VAWT) model's rotation on the motion. From the results behaviors of moonpools were often nonlinear to incident waves and the behaviors affected on motion responses of the floating model. The experimental results were compared with the calculation results. When non-linearity due to overtopping of water from moonpools was found, the calculations could not reproduce hydro forces but they are able to estimate motion responses. The study confirmed reduction effects due to the moonpools on motion responses comparing with a conventional pontoon with identical displacement.
AB - This paper describes motion behaviors of a floating body and water regions of moonpools. The floating model to be focused in this study has moonpools and is for offshore wind turbine system with two vertical axis wind turbines. Motion behaviors of water region in moonpools strongly affect on motion characteristics of a floating body itself. Often the effects lead to non-linear motion of the floating body. Besides, when the floating body is a system of vertical axis offshore wind turbines, the system becomes more complicated. This study conducted theoretical calculations and model experiments in a wave tank. Behaviors of moonpools were measured in regular waves and we measured wave exciting forces, radiation forces on heave and motion responses of the floating model. Also, the study considered effects of Vertical Axis Wind Turbine (VAWT) model's rotation on the motion. From the results behaviors of moonpools were often nonlinear to incident waves and the behaviors affected on motion responses of the floating model. The experimental results were compared with the calculation results. When non-linearity due to overtopping of water from moonpools was found, the calculations could not reproduce hydro forces but they are able to estimate motion responses. The study confirmed reduction effects due to the moonpools on motion responses comparing with a conventional pontoon with identical displacement.
KW - Added mass
KW - FOWT
KW - Moonpool
KW - Motion response
KW - VAWT
KW - Wave damping
KW - Wave exciting force
KW - Wind-wave coupled condition
UR - http://www.scopus.com/inward/record.url?scp=85140772274&partnerID=8YFLogxK
U2 - 10.1115/OMAE2022-79153
DO - 10.1115/OMAE2022-79153
M3 - Conference contribution
AN - SCOPUS:85140772274
T3 - Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
BT - Ocean Space Utilization
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2022
Y2 - 5 June 2022 through 10 June 2022
ER -