Experimental Comparison of an Annular Floating Offshore Wind Turbine Hull Against Past Model Test Data

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Hannah L. Allen ◽  
Andrew J. Goupee ◽  
Anthony M. Viselli ◽  
Christopher K. Allen ◽  
Habib J. Dagher
Keyword(s):  
Wind Turbine ◽  
Oil And Gas ◽  
Offshore Wind ◽  
Secondary Component ◽  
Scale Model ◽  
Experimental Comparison ◽  
Commercial Application ◽  
Offshore Wind Turbine ◽  
Ocean Engineering ◽  
Floating Offshore Wind Turbine

Abstract Floating offshore wind turbine (FOWT) hull technologies are evolving rapidly with many technically viable designs. However, a commercially dominant architecture has yet to emerge. Early hull designs including semisubmersible, spar, and tension leg platforms were largely derived from offshore oil and gas technologies, but recent developments in the commercial application and optimization of FOWTs have resulted in a number of unique, FOWT-specific hull configurations. One hull design of interest includes the application of a moonpool to aid in mitigating platform motion in the presence of waves. A version of this annular hull has been deployed in France and Japan. In this paper, a 6-MW version of an annular hull is studied through experimental model testing and numerical analysis. The primary portion of this work involves testing a 1/100th-scale model in the Harold Alfond Wind Wave Ocean Engineering Laboratory at the University of Maine. A secondary component of this work investigates the capability of ANSYS aqwa, a typical commercial hydrodynamic software, to recreate the wave-induced motion of a FOWT hull containing a moonpool. An additional secondary component of this study compares the wave-only performance of the annular hull to experimental data obtained for the DeepCwind semisubmersible, spar, and tension leg platform to provide context for the measured response. The results obtained show that ANSYS aqwa can adequately predict the gross response of the annular hull motion and that the moonpool design tested often exhibits greater motion than the systems tested during the DeepCwind campaign.

Numerical Design of a Floating Offshore Wind Turbine Large Scale Model for Control Purposes

2021 ◽  
Author(s):  
Federico Taruffi ◽  
Simone Di Carlo ◽  
Sara Muggiasca ◽  
Alessandro Fontanella
Keyword(s):  
Numerical Model ◽  
Wind Turbine ◽  
Large Scale ◽  
Offshore Wind ◽  
Scale Model ◽  
Offshore Wind Turbine ◽  
Floating Platform ◽  
Floating Offshore Wind Turbine ◽  
Numerical Design ◽  
Blue Growth

Abstract This paper deals with the numerical design of a floating offshore wind turbine outdoor large-scale prototype based on the DTU 10MW. The objective of this work is to develop a numerical simulation environment for the design of an outdoor scaled prototype. The numerical model is realized coupling the preliminary designed Blue Growth Farm large-scale turbine model with a traditional floater, the OC3 spar buoy. The numerical model is used to evaluate the loads associated with the wind turbine when combined to a floating foundation, with the focus on the coupling between the dynamics of the control system and the one of the floating platform. In addition to this, also the consistency of loads on crucial turbine components is an interesting test bench for the evaluation of the dynamical effects and drives the final design of the physical model.

At Sea Experiment of a Hybrid Spar for Floating Offshore Wind Turbine Using 1/10-Scale Model

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Tomoaki Utsunomiya ◽  
Hidekazu Matsukuma ◽  
Shintaro Minoura ◽  
Kiyohiko Ko ◽  
Hideki Hamamura ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Prestressed Concrete ◽  
Cost Effective ◽  
Offshore Wind ◽  
Scale Model ◽  
Offshore Wind Turbine ◽  
Prototype Model ◽  
Horizontal Axis Wind Turbine ◽  
Floating Offshore Wind Turbine ◽  
Level 3

This study aims at development of a cost-effective, floating offshore wind turbine. The prototype model considered herein is composed of (1) 2-MW horizontal-axis wind turbine (HAWT) of downwind type, (2) steel monotower with 55-m hub height above sea level, (3) steel-prestressed concrete (PC) hybrid SPAR-type foundation with 70-m draft, and (4) catenary mooring system using anchor chains. In order to demonstrate the feasibility of the concept, an at-sea experiment using a 1/10-scale model of the prototype has been made. The demonstrative experiment includes (1) construction of the hybrid SPAR foundation using PC and steel, the same as the prototype; (2) dry-towing and installation to the at-sea site at 30-m distance from the quay of the Sasebo shipbuilding yard; (3) generating electric power using a 1 kW HAWT; and (4) removal from the site. During the at-sea experiment, wind speed, wind direction, tidal height, wave height, motion of the SPAR, tension in a mooring chain, and strains in the tower and the SPAR foundation have been measured. Motion of the SPAR has been numerically simulated and compared with the measured values, where basically good agreement is observed.

Experimental Validation for Motion of a SPAR-Type Floating Offshore Wind Turbine Using 1/22.5 Scale Model

2009 ◽  
Author(s):  
Tomoaki Utsunomiya ◽  
Tomoki Sato ◽  
Hidekazu Matsukuma ◽  
Kiyokazu Yago
Keyword(s):  
Wind Turbine ◽  
Simulation Method ◽  
Offshore Wind ◽  
Irregular Waves ◽  
Scale Model ◽  
Offshore Wind Turbine ◽  
Floating Offshore Wind Turbine ◽  
Wave Basin ◽  
Tank Experiment ◽  
Made In

In this paper, motion of a SPAR-type floating offshore wind turbine (FOWT) subjected to wave loadings is examined. The proposed prototype FOWT mounts a 2MW wind turbine of down-wind type, whose rotor diameter is 80m and hub-height 55m. The SPAR-type floating foundation measures 60m in draft, having circular sections whose diameter is 12m at the lower part, 8.4m at the middle (main) part and 4.8m at the upper part. The FOWT is to be moored by a conventional anchor-chain system. In order to design such a FOWT system, it is essential to predict the motion of the FOWT subjected to environmental loadings such as irregular waves, turbulent winds, currents, etc. In this paper, the motion of the FOWT subjected to regular and irregular waves is examined together with the application of steady horizontal force corresponding to steady wind. The wave-tank experiment is made in the deep sea wave-basin at NMRI (National Maritime Research Institute), using a 1/22.5 scale model of the prototype FOWT. The experimental results are compared with the numerical simulation results for validation of the simulation method.

Numerical and Experimental Comparison of the Wave Response of a Very Light Floating Offshore Wind Turbine With Guy Wires

2020 ◽  
Author(s):  
Hiroki Shiohara ◽  
Rodolfo T. Gonçalves ◽  
Hidetaka Houtani ◽  
Hideyuki Suzuki ◽  
Anja Schnepf ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Bending Moment ◽  
Wave Period ◽  
Offshore Wind ◽  
Experimental Comparison ◽  
Inertia Force ◽  
Offshore Wind Turbine ◽  
Elastic Model ◽  
Floating Offshore Wind Turbine ◽  
Guy Wires

Abstract A floating offshore wind turbine (FOWT) concept with a guy wire-supported tower was investigated to obtain results of motion in waves considering its elastic model characteristics. The FOWT concept aims to reduce construction costs by using a light-weight structure tensioned with guy wires and a downwind turbine concept type. A wave tank experiment of an elastically similar segmented backbone model in the 1/60th scale was conducted to clarify the dynamic elastic response features of the structure. The results were compared with numerical simulations obtained with software NK-UTWind (in house software developed by the University of Tokyo) and WAMIT code. It was clarified that the bending moment for tower and pontoons had two peak values when the response for each wave period was examined. The peak in the short-wave period was due to sagging when the wavelength matched the floater length. The other peak was due to the largest tower top acceleration, which caused a large bending moment at the tower base and pontoon to support the inertia force.

Designing Process and Motion Characteristics of Spar Type Offshore Wind Turbines

2013 ◽  
Author(s):  
Yasunori Nihei ◽  
Tomoki Ikoma ◽  
Minori Kozen ◽  
Fumiya Sato ◽  
Motohiko Murai ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Oil And Gas ◽  
Type Structure ◽  
Offshore Wind ◽  
Scale Model ◽  
Offshore Wind Turbine ◽  
Offshore Wind Turbines ◽  
Motion Characteristics

In this paper, we will discuss about the designing process and the motion characteristics of the spar type offshore wind turbines. When considering a spar type structure for offshore wind turbines, it is important to take a lot of elements into consideration which have not yet been considered in the case of oil and gas platforms. In this research, we used the following standards to conduct our tests. The limit of the heel angle was 5 degrees when the wind turbines are generating in the rated state. When designing the substructure for this research we have decided to go with a substructure that operates in depth of 100m or more. Following the conditions above we have designed the spar type offshore wind turbine used for this research. In order to compare the simulated result we have created a scale model and performed tank tests under various conditions. Also we observed unexpected motion characteristics in certain mooring arrangement. So we will touch these subjects in this paper.

Numerical and Experimental Comparison of the Wave Response of a Very Light Floating Offshore Wind Turbine With Guy Wires

2021 ◽  
Author(s):  
Hiroki Shiohara ◽  
Rodolfo Goncalves ◽  
Hidetaka Houtani ◽  
Hideyuki Suzuki ◽  
Anja Schnept ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Experimental Comparison ◽  
Offshore Wind Turbine ◽  
Floating Offshore Wind Turbine ◽  
Wave Response ◽  
Guy Wires

A Reduced-Order Mathematical Model for the Current-Induced Motion of a Floating Offshore Wind Turbine

2021 ◽  
Author(s):  
Éverton L. de Oliveira ◽  
Celso P. Pesce ◽  
Bruno Mendes ◽  
Renato M. M. Orsino ◽  
Guilherme R. Franzini
Keyword(s):  
Mathematical Model ◽  
Wind Turbine ◽  
Horizontal Plane ◽  
Offshore Wind ◽  
Scale Model ◽  
Offshore Wind Turbine ◽  
Small Scale ◽  
Floating Offshore Wind Turbine ◽  
Reduced Order ◽  
Induced Motion

Abstract Floating offshore platforms motions induced by currents are quite complex phenomena, in general. In particular, VIM, Vortex-Induced Motion, is a type often encountered in platforms with circular columns. Recently, VIM has been observed in towing tank tests with a small-scale model of a Floating Offshore Wind Turbine (FOWT), the OC4 Phase II floater, a 3+1 columns platform. The present paper proposes a reduced-order mathematical model (ROM) to assess VIM of a FOWT. The ROM is derived on the horizontal plane, including yaw motions and nonlinear mooring forces. Current forces are represented through ‘wake variables’, adapting phenomenological models firstly used for VIM of mono-column platforms. The ROM is built upon a set of eleven generalized coordinates, three for the rigid body motion on the horizontal plane and a pair of wake variables for each column, resulting in a system of eleven nonlinear second-order ODEs. The pairs of wake variables obey van der Pol equations, and use hydrodynamic coefficients and parameters obtained from previous experiments with small draught cylinders. Hydro-dynamic interferences among columns or heave plates effects on the flow are not considered, for simplicity. The validity of the proposed model is assessed having the mentioned small-scale experimental campaign as a case study. The simulations are carried out at three different current incidence angles, 0, 90 and 180 degrees, spanning a large range of reduced velocities. The simulations reproduce well the oscillations observed in the experimental tests. A good agreement in transverse oscillations is found, including lock-in regions. The simulations also depict a possibly important phenomenon: a resonant yaw motion emerging at high reduced velocities.

On Sea Experiment of a Hybrid SPAR for Floating Offshore Wind Turbine Using 1/10 Scale Model

2010 ◽  
Author(s):  
Tomoaki Utsunomiya ◽  
Hidekazu Matsukuma ◽  
Shintaro Minoura ◽  
Kiyohiko Ko ◽  
Hideki Hamamura ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Prestressed Concrete ◽  
Cost Effective ◽  
Offshore Wind ◽  
Scale Model ◽  
Offshore Wind Turbine ◽  
Type Model ◽  
Horizontal Axis Wind Turbine ◽  
Floating Offshore Wind Turbine ◽  
Level 3

This study aims at development of a cost-effective floating offshore wind turbine. The proto-type model considered herein is composed of 1) 2MW horizontal-axis wind turbine (HAWT) of down-wind type, 2) steel mono-tower with 55m hub height above sea level, 3) steel-prestressed concrete (PC) hybrid SPAR-type foundation with 70m draught, and 4) catenary mooring system using anchor chains. In order to demonstrate the feasibility of the concept, on-sea experiment using a 1/10 scale model of the prototype has been made. The demonstrative experiment includes 1) construction of the hybrid SPAR foundation using PC and steel as same as the prototype, 2) dry-towing and installation to the on-sea site at 30m distance from the quay of the Sasebo shipbuilding yard, 3) generating electric power using a 1kW HAWT, and 4) removal from the site. During the on-sea experiment, wind speed, wind direction, tidal height, wave height, motion of the SPAR, tension in a mooring chain, and strains in the tower and the SPAR foundation have been measured. Motion of the SPAR has been numerically simulated and compared with the measured values, where basically good agreement is observed.

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