Development of a CFD-CSD Coupling Technique for Large Scale Offshore Wind Turbines

2021 ◽  
Author(s):  
Auraluck Pichitkul ◽  
Lakshmi Sankar
Keyword(s):  
Wind Turbines ◽  
Large Scale ◽  
Offshore Wind ◽  
Coupling Technique ◽  
Offshore Wind Turbines

Development of a CFD-CSD Coupling Technique for Large Scale Offshore Wind Turbines

2020 ◽  
Author(s):  
Auraluck Pichitkul ◽  
Lakshmi N. Sankar
Keyword(s):  
Fluid Dynamics ◽  
Renewable Energy ◽  
Wind Turbines ◽  
Large Scale ◽  
Time History ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Renewable Energy Resources ◽  
Aerodynamic Loads ◽  
Offshore Wind Turbines

Abstract Wind engineering technology has been continuously investigated and developed over the past several decades in response to steadily growing demand for renewable energy resources, in order to meet the increased demand for power production, fixed and floating platforms with different mooring configurations have been fielded, accommodating large-scale offshore wind turbines in deep water areas. In this study, the aerodynamic loads on such systems are modeled using a computational structural dynamics solver called OpenFAST developed by National Renewable Energy Laboratory, coupled to an in-house computational fluid dynamics solver called GT-Hybrid. Coupling of the structural/aerodynamic motion time history with the CFD analysis is done using an open File I/O process. At this writing, only a one-way coupling has been attempted, feeding the blade motion and structural deformations from OpenFAST into the fluid dynamics analysis. The sectional aerodynamic loads for a large scale 5 MW offshore wind turbine are presented, and compared against the baseline OpenFAST simulations with classical blade element-momentum theory. Encouraging agreement has been observed.

Research on the influence of large scale offshore wind turbines integrated into Jiangsu power system

2021 ◽  
Author(s):  
C. Hui ◽  
P. Zhuyi ◽  
Z. Xingyu ◽  
X. Zhenjian ◽  
X. Sixuan ◽  
...  
Keyword(s):  
Power System ◽  
Wind Turbines ◽  
Large Scale ◽  
Offshore Wind ◽  
Offshore Wind Turbines

scholarly journals A Coupled CFD/Multibody Dynamics Analysis Tool for Offshore Wind Turbines With Aeroelastic Blades

2017 ◽  
Author(s):  
Yuanchuan Liu ◽  
Qing Xiao ◽  
Atilla Incecik
Keyword(s):  
Wind Turbine ◽  
Multibody Dynamics ◽  
Wind Turbines ◽  
Large Scale ◽  
Turbine Blades ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Analysis Tool ◽  
Dynamics Analysis ◽  
Offshore Wind Turbines

Aero-elasticity is an important issue for modern large scale offshore wind turbines with long slender blades. The behaviour of deformable turbine blades influences the structure stress and thus the sustainability of blades under large unsteady wind loads. In this paper, we present a fully coupled CFD/MultiBody Dynamics analysis tool to examine this problem. The fluid flow around the turbine is solved using a high-fidelity CFD method while the structural dynamics of flexible blades is predicted using an open source code MBDyn, in which the flexible blades are modelled via a series of beam elements. Firstly, a flexible cantilever beam is simulated to verify the developed tool. The NREL 5 MW offshore wind turbine is then studied with both rigid and flexible blades to analyse the aero-elastic influence on the wind turbine structural response and aerodynamic performance. Comparison is also made against the publicly available data.

scholarly journals Seismic Design of Offshore Wind Turbines: Good, Bad and Unknowns

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3496
Author(s):  
Subhamoy Bhattacharya ◽  
Suryakanta Biswal ◽  
Muhammed Aleem ◽  
Sadra Amani ◽  
Athul Prabhakaran ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Large Scale ◽  
Wind Farms ◽  
Offshore Wind ◽  
Future Research ◽  
Offshore Wind Farms ◽  
Analysis And Design ◽  
Offshore Wind Turbines ◽  
Floating Systems

Large scale offshore wind farms are relatively new infrastructures and are being deployed in regions prone to earthquakes. Offshore wind farms comprise of both offshore wind turbines (OWTs) and balance of plants (BOP) facilities, such as inter-array and export cables, grid connection etc. An OWT structure can be either grounded systems (rigidly anchored to the seabed) or floating systems (with tension legs or catenary cables). OWTs are dynamically-sensitive structures made of a long slender tower with a top-heavy mass, known as Nacelle, to which a heavy rotating mass (hub and blades) is attached. These structures, apart from the variable environmental wind and wave loads, may also be subjected to earthquake related hazards in seismic zones. The earthquake hazards that can affect offshore wind farm are fault displacement, seismic shaking, subsurface liquefaction, submarine landslides, tsunami effects and a combination thereof. Procedures for seismic designing OWTs are not explicitly mentioned in current codes of practice. The aim of the paper is to discuss the seismic related challenges in the analysis and design of offshore wind farms and wind turbine structures. Different types of grounded and floating systems are considered to evaluate the seismic related effects. However, emphasis is provided on Tension Leg Platform (TLP) type floating wind turbine. Future research needs are also identified.

Mooring Designs for Floating Offshore Wind Turbines Leveraging Experience From the Oil & Gas Industry

2021 ◽  
Author(s):  
Kai-tung Ma ◽  
Yongyan Wu ◽  
Simen Fodstad Stolen ◽  
Leopoldo Bello ◽  
Menno ver der Horst ◽  
...  
Keyword(s):  
Wind Turbines ◽  
Large Scale ◽  
Wind Farms ◽  
Offshore Wind ◽  
Synthetic Fiber ◽  
Extensive Experience ◽  
Gas Industry ◽  
Offshore Wind Turbines ◽  
Floating Offshore Wind Turbines

Abstract As renewable energy developers start venturing into deeper waters, the floating offshore wind turbines (FOWTs) are becoming the preferred solutions over fixed supporting structures. Many similarities can be identified between a FOWT and a floating oil & gas facility, such as floater concepts (spar, semi-submersible, tension leg platform, etc) and their mooring system designs. This paper focuses on the mooring designs for FOWTs by leveraging the extensive experience gained from the offshore oil & gas industry. Similarities and differences are highlighted in design criteria, mooring analysis, long-term integrity management, installation method and project execution. The established practices regarding mooring design and analysis are reviewed. Anchor radius is recommended based on water depth by referencing sample mooring designs from the oil & gas industry. Long-term mooring integrity and failure rates are summarized. Meanwhile, a few well-known issues are discussed, such as line break due to fatigue, corrosion on chain, and known issues with components such as clump weights. Regarding mooring installation, the established method for prelay and hook-up is reviewed. Finally, opportunities for cost reduction of mooring systems of FOWTs are presented related to project execution of large scale wind farms as well as potential areas of innovation, such as installation methods, use of synthetic fiber rope, and digitalization. In summary, the state-of-the-art practices from the oil & gas industry are reviewed and documented to benefit the developments of upcoming FOWT projects.

Analysis of Biplane Blades for Large-Scale Offshore Wind Turbines

2021 ◽  
Author(s):  
Auraluck Pichitkul ◽  
Lakshmi Sankar ◽  
Richard Wirz
Keyword(s):  
Wind Turbines ◽  
Large Scale ◽  
Offshore Wind ◽  
Offshore Wind Turbines

REDWIN Foundation Models for Integrated Dynamic Analyses of Offshore Wind Turbines

2019 ◽  
Author(s):  
Ana M. Page ◽  
Karin Norén-Cosgriff ◽  
Kristoffer S. Skau ◽  
Amir M. Kaynia
Keyword(s):  
Dynamic Response ◽  
Wind Turbines ◽  
Large Scale ◽  
Nonlinear Models ◽  
Offshore Wind ◽  
Complex Nature ◽  
Optimized Design ◽  
Integrated Simulation ◽  
Offshore Wind Turbines ◽  
The North

Abstract Due to the complex nature of the loads on Offshore Wind Turbines (OWTs), accurate and optimized design of these structures require integrated simulation tools that can properly capture the various structural interactions governing the response. Considerable progress has been made in recent years on developing proper models for coupled aerodynamic and hydrodynamic loads together with advanced control systems for turbines. These efforts have resulted in a suite of aero-servo-hydro-elastic numerical simulation codes available to the industry. However, proper foundation models have been lagging behind in these tools despite availability of various advanced nonlinear models for foundations in general. This has led to uneconomical design of OWTs that have consistently failed to reproduce the measured natural frequencies and can negatively affect the design and structural performance of OWTs. This paper presents a library of recently developed foundation models based on the theory of plasticity together with their verification against large-scale field test data. These models are cast in the framework of macro-elements that represent the nonlinear response of the soil-foundation system due to arbitrary coupled loads at the seabed. The paper also presents results of the numerical simulations of the dynamic response of a monopile-based OWT in the North Sea using an aero-servo-hydro-elastic code and comparison with the data collected from one of the instrumented OWTs in the field. It is further presented how the characteristics of the measured dynamic response change with loading over a long period and the way the response characteristics relate to the basic features of the developed models.

Preliminary Analysis on Integrated Transportation Technique for Offshore Wind Turbines

2013 ◽  
Author(s):  
Puyang Zhang ◽  
Hongyan Ding ◽  
Conghuan Le ◽  
Siyu Zhang ◽  
Xu Huang
Keyword(s):  
Wind Turbines ◽  
Large Scale ◽  
Time Windows ◽  
Economic Benefits ◽  
Offshore Wind ◽  
Unit Weight ◽  
Construction Technology ◽  
Bucket Foundation ◽  
Offshore Wind Turbines ◽  
Hoisting System

With current construction technology of offshore wind turbines, there is a need for a major marine spread to install the foundation, tower and turbine. There is a clear benefit that offshore installation can be integrated into one operation. The large-scale composite bucket foundation is a basis for the one-step integrated transportation and installation technique with a special vessel. The proposed transportation and installation technique will minimize offshore spread and maximize the proportion of work carried out onshore with consequent benefits in terms of cost, quality and safety. The composite bucket foundation with self-floating property would be towing into a semicircle groove of the vessel and connected with wireropes of the fixed crane. Afterwards, tower and turbine are attached onto the foundation at shore and the whole unit of foundation, tower and turbine is loaded out from the quayside, transported to site and set down on the seabed. During transportation, half of the unit weight is taken by the hoisting system of the vessel and other weight is supported by air cushions inside the composite bucket foundation. A detailed case is studied to determine the motions of the vessel with two units to confirm the viability and feasibility of such a method of the integrated transportation. The transportation and installation methodology are developed to reduce the time spent on offshore works in order to fit the installation work within the time windows with great economic benefits.

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