Discussion on Hybrid Utilization for Offshore Wind and Wave Energy

2015 ◽  
Author(s):  
Katsunari Fujioka ◽  
Yasunori Nihei ◽  
Marc Le Boulluec
Keyword(s):  
Numerical Simulation ◽  
Wind Turbine ◽  
Wave Energy ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Efficient Utilization ◽  
Wave Energy Converters ◽  
Tank Test ◽  
The Stability ◽  
Incident Waves

In this paper, we will discuss the concept of combined utilization of offshore wind and wave energy in terms of both tank test and numerical simulation. There are some possibility that combined utilization of ocean renewable energies can avoid some disadvantages that single utilization of them may have, such as cost problem associated with the stability of power and power supply. In this study, we focus on the motion of an offshore wind turbine in waves associated to wave energy converters, are installed in the same area in order to improve its motion by reducing the effect of incident waves. We carried out wave tank test and numerical simulation, and investigated the motion of wind turbine in waves. In addition, numerical simulation allows to visualize the wave fields around those devices. Appropriate arrangement of them is discussed for the most efficient utilization of offshore wind and wave energy.

The Potential for Combining Floating Wind Turbines With Point Absorbing Wave Energy Converters

2021 ◽  
Author(s):  
David M. Skene ◽  
Nataliia Sergiienko ◽  
Boyin Ding ◽  
Benjamin Cazzolato
Keyword(s):  
Wind Turbine ◽  
Frequency Domain ◽  
Wave Energy ◽  
Two Dimensions ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Specific Design ◽  
Energy Converter ◽  
Point Absorber ◽  
Wave Energy Converters

Abstract The potential for coupling a cylindrical point absorber type wave energy converter (WEC) to a 5MW spar type floating offshore wind turbine is investigated. The wind and WEC system is modelled in the frequency domain and in two dimensions under the simplifying assumption that wind and waves propagate in the same direction. Coupling of the bodies is considered with respect to all theoretical combinations that might be achieved rather than a single specific design. Results are analysed with respect to the maximum power that the WEC coupling can achieve. It is shown that for mild waves the WEC can theoretically produce power in the range of 0.2 to 0.6 MW, its optimal dimensions are such that the draft and radius are approximately 18.8 m, and that obtaining this power tends to marginally amplify the pitch of the spar.

Dynamic Response of a Spar-Type Floating Wind Turbine at Power Generation

2014 ◽  
Author(s):  
Tomoaki Utsunomiya ◽  
Shigeo Yoshida ◽  
Soichiro Kiyoki ◽  
Iku Sato ◽  
Shigesuke Ishida
Keyword(s):  
Numerical Simulation ◽  
Power Generation ◽  
Dynamic Response ◽  
Wind Turbine ◽  
Prestressed Concrete ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Floating Foundation ◽  
Mooring Dynamics ◽  
Nagasaki Prefecture

In this paper, dynamic response of a Floating Offshore Wind Turbine (FOWT) with spar-type floating foundation at power generation is presented. The FOWT mounts a 100kW wind turbine of down-wind type, with the rotor’s diameter of 22m and a hub-height of 23.3m. The floating foundation consists of PC-steel hybrid spar. The upper part is made of steel whereas the lower part made of prestressed concrete segments. The FOWT was installed at the site about 1km offshore from Kabashima Island, Goto city, Nagasaki prefecture on June 11th, 2012. Since then, the field measurement had been made until its removal in June 2013. In this paper, the dynamic behavior during the power generation is presented, where the comparison with the numerical simulation by aero-hydro-servo-mooring dynamics coupled program is made.

scholarly journals Model Test and Numerical Simulation of Grouted Connections for Offshore Wind Turbine Under Static Axial Load

2020 ◽  
Vol 8 (7) ◽  
pp. 543
Author(s):  
Weiqiu Zhong ◽  
Wuxu Li ◽  
Tao Yang ◽  
Deming Liu ◽  
Lintao Li
Keyword(s):  
Numerical Simulation ◽  
Bearing Capacity ◽  
Wind Turbine ◽  
Model Test ◽  
Axial Load ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Shear Keys ◽  
Better Than

The bearing capacity of the grouted connections is investigated through the model test and numerical simulation with two rates (low and high) and four kinds of specimens: shorter without shear keys, shorter with shear keys, longer with shear keys, and conical with shear keys. It reveals that the bearing characteristics of the specimen of longer with shear keys is worse than the specimen of conical with shear keys, but better than the specimen of shorter with shear keys. Moreover, the bearing characteristics of the specimen of shorter without shear keys is the worst one.

scholarly journals Hydrodynamic investigation on an OWC wave energy converter integrated into an offshore wind turbine monopile

2020 ◽  
Vol 162 ◽  
pp. 103731 ◽  
Author(s):  
Yu Zhou ◽  
Dezhi Ning ◽  
Wei Shi ◽  
Lars Johanning ◽  
Dongfang Liang
Keyword(s):  
Wind Turbine ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Energy Converter

Feasibility Study of the Floating Axis Wind Turbine: Preliminary Model Experiments

2017 ◽  
Author(s):  
Hiromichi Akimoto ◽  
Kazuhiro Iijima ◽  
Yasuhiro Takata
Keyword(s):  
Wind Turbine ◽  
Feasibility Study ◽  
Vertical Axis ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Water Tank ◽  
Tank Model ◽  
Preliminary Model ◽  
Vertical Axis Turbine ◽  
The Stability

Floating Axis Wind Turbine is a concept of a floating vertical axis offshore wind turbine. In this design, a vertical axis turbine is directly mounted on a rotating spar buoy so that it does not require mechanical bearing supports of the heavy rotor. Multiple roller-generator units are on another small semi-sub float for extracting power from the rotating spar. A water tank model of 1/100 scale 5MW turbine and model power take-off units of about 1/20 scale are used for checking the concept. The results show the stability of the proposed turbine and demonstrates the function of roller-generator units.

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