Computational free-surface fluid–structure interaction with application to floating offshore wind turbines

Yan, Jinhui; Korobenko, Artem; Deng, Xiaowei; Bazilevs, Yuri

doi:10.1016/j.compfluid.2016.03.008

Cited by 155 publications

(55 citation statements)

References 80 publications

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“…[4] or [5]. In a majority of cases, only a component was studied at a time, as did [6], [7] or [8]. The same situation is observed in the literature for experimental studies.…”

Section: Introductionsupporting

confidence: 55%

“…The stress tensor accounts for all the fluid effects occurring, and to evaluate the loads applied on Ω, the computation of local normal constraint T local is required and performed in Eq. (8). The definition of a vector normal to Ω is necessary at that point, but as the computational points are not disposed along ∂Ω, this determination is not immediate.…”

Section: Computing the Force Applied On An Immersed Elementmentioning

confidence: 99%

See 1 more Smart Citation

Towards Numerical Simulation of Offshore Wind Turbines Using Anisotropic Mesh Adaptation

Douteau

Silva

Digonnet

et al. 2019

Recent Advances in CFD for Wind and Tidal Offshore Turbines

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Offshore wind turbines are currently increasing the potential of wind energy, and numerical simulation is a way to help this industry to reach maturity. In the context of floating wind energy, predicting the loads applied on structures and their response is essential. Those data will enable an optimization of floaters dimensioning, necessary for CAPEX reduction.As the simulation of floating wind turbines requires the representation of both complex geometries and phenomena, several alternative techniques have been developed. The wake generated by the rotor can be modeled using methodologies inherited from onshore wind turbines simulation, and coupled with a hydrodynamic code. However those simplified methods have been primarily developed for wake study, and thus have varying precision for loads estimation.This work proposes a methodology for the simulation of a single or several turbines with an exact representation of the geometries involved, targeting an accurate evaluation of loads. The software library used is ICI-tech, developed at the High Performance Computing Institute (ICI) of Centrale Nantes. A monolithic approach is applied on a single computational mesh, where all the different phases are defined through level-set functions. The Navier-Stokes (NS) equations are solved in the Variational MultiScale (VMS) formalism using stabilized finite elements. This approach, coupled with an automatic and anisotropic adaptation procedure, guarantees the good representation of the geometries immersed. The automatic adaptation refines the mesh only in interest zones, allowing the simulation of phenomena with very different orders of magnitude, e.g. aerodynamics around blades and waves propagation. The reduction of the number of points in the mesh and the massive parallelization of the code are also necessary for wind turbine simulation.

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“…[4] or [5]. In a majority of cases, only a component was studied at a time, as did [6], [7] or [8]. The same situation is observed in the literature for experimental studies.…”

Section: Introductionsupporting

confidence: 55%

Section: Computing the Force Applied On An Immersed Elementmentioning

confidence: 99%

Towards Numerical Simulation of Offshore Wind Turbines Using Anisotropic Mesh Adaptation

Douteau

Silva

Digonnet

et al. 2019

Recent Advances in CFD for Wind and Tidal Offshore Turbines

View full text Add to dashboard Cite

show abstract

“…At each Newton iteration a flexible GMRES algorithm [64,65] is employed to solve the coupled linear-equation systems. GMRES is preconditioned using iterative solution of individual, linearized fluid-mechanics and level-set problems, as proposed in [92].…”

Section: Discretization Methodsmentioning

confidence: 99%

Free-surface flow modeling and simulation of horizontal-axis tidal-stream turbines

Yan¹,

Deng²,

Korobenko³

et al. 2017

Computers & Fluids

Self Cite

127

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A computational free-surface flow framework that enables 3D, time-dependent simulation of horizontal-axis tidal-stream turbines (HATTs) is presented and deployed using a complexgeometry HATT. Free-surface flow simulations using the proposed framework, without any empiricism, are able to accurately capture the effect of the free surface on the hydrodynamic performance of the turbine, as demonstrated through excellent agreement with the experimental data. To carry out the free-surface computations, we have developed a novel level-set redistancing procedure compatible with the sliding-interface technique used for handling the rotor-stator interaction in the HATT full-machine simulations. To illustrate the versatility of the proposed approach, additional computations are carried out where the HATT is subjected to wave action.

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“…IGA has also been shown to feature significantly improved per‐degree‐of‐freedom accuracy relative to traditional FEA in many cases. () Past wind turbine and wind turbine blade simulations have employed IGA,() but none of these efforts have utilized IGA for the purposes of iterative blade design. The present framework enables IGA‐based wind turbine blade design through a variety of unique approaches and developments presented herein.…”

Section: Introductionmentioning

confidence: 99%

A framework for isogeometric‐analysis‐based optimization of wind turbine blade structures

2018

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Early‐stage wind turbine blade design usually relies heavily on low‐fidelity structural models; high‐fidelity, finite‐element‐based structural analyses are reserved for later design stages because of their complex workflows and high computational expense. Yet, high‐fidelity structural analyses often provide design‐governing feedback such as buckling load factors. Mitigation of the issues of workflow complexity and computational expense would allow designers to utilize high‐fidelity feedback earlier, more easily, and more often in the design process. Thus, a blade analysis framework that employs isogeometric analysis (IGA), a simulation method that overcomes many of the aforementioned drawbacks associated with traditional finite element analysis (FEA), is presented. IGA directly utilizes the mathematical models generated by computer‐aided design (CAD) software, requiring less user interaction and no conversion of parametric geometries to finite element meshes. Furthermore, IGA tends to have superior per‐degree‐of‐freedom accuracy compared with traditional FEA. Issues unique to IGA in the context of wind turbine blade design, such as coupling of thin‐shell components, are addressed, and a design approach that combines reduced‐order aeroelastic analysis with IGA is outlined. Aeroelastic analysis is used to efficiently provide dynamic kinematic data for a wide range of wind load cases, while IGA is used to perform buckling analysis. The value of incorporating high‐fidelity analysis feedback into blade design is demonstrated through optimization of the NREL/SNL 5 MW wind turbine blade. A variety of potential designs are produced with reduced blade mass and material cost, and IGA‐based buckling analysis is shown to provide design‐governing constraint information.

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Computational free-surface fluid–structure interaction with application to floating offshore wind turbines

Cited by 155 publications

References 80 publications

Towards Numerical Simulation of Offshore Wind Turbines Using Anisotropic Mesh Adaptation

Towards Numerical Simulation of Offshore Wind Turbines Using Anisotropic Mesh Adaptation

Free-surface flow modeling and simulation of horizontal-axis tidal-stream turbines

A framework for isogeometric‐analysis‐based optimization of wind turbine blade structures

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