Aero‐hydro‐servo‐elastic coupling of a multi‐body finite‐element solver and a multi‐fidelity vortex method

Ramos‐García, Néstor; Sessarego, Matias; Horcas, Sergio González

doi:10.1002/we.2584

Cited by 20 publications

(25 citation statements)

References 41 publications

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“…The codes EllipSys3D and HAWC2 are coupled, in a partitioned manner, through the Python framework, referred to as the DTU coupling, originally created by Heinz et al (2016a) and further developed by Horcas et al (2019) andGarcía Ramos et al (2021). Through the use of the coupling framework, the BEM aerodynamics module of HAWC2 is replaced by an interface to the EllipSys3D CFD code.…”

Section: Fsi Frameworkmentioning

confidence: 99%

“…In this case, however, the BEM calculations are used for initialization only to get good estimate of the initial bending, and for that reason no further corrections to the airfoil data have been conducted. Dynamic stall corrections (Hansen et al, 2004) and tip corrections (Glauert, 1935) are applied during the initializing BEM calculation. No controller is used, as a constant rotation speed of 16.2 rpm and pitch setting of −4.75 • (increasing the angle of attack) are set.…”

Section: Hawc2 Modelmentioning

confidence: 99%

See 1 more Smart Citation

Wind turbines in atmospheric flow: fluid–structure interaction simulations with hybrid turbulence modeling

Grinderslev

Sørensen²,

Horcas

et al. 2021

Wind Energ. Sci.

Self Cite

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Abstract. In order to design future large wind turbines, knowledge is needed about the impact of aero-elasticity on the rotor loads and performance and about the physics of the atmospheric flow surrounding the turbines. The objective of the present work is to study both effects by means of high-fidelity rotor-resolved numerical simulations. In particular, unsteady computational fluid dynamics (CFD) simulations of a 2.3 MW wind turbine are conducted, this rotor being the largest design with relevant experimental data available to the authors. Turbulence is modeled with two different approaches. On one hand, a model using the well-established technique of improved delayed detached eddy simulation (IDDES) is employed. An additional set of simulations relies on a novel hybrid turbulence model, developed within the framework of the present work. It consists of a blend of a large-eddy simulation (LES) model by Deardorff for atmospheric flow and an IDDES model for the separated flow near the rotor geometry. In the same way, the assessment of the influence of the blade flexibility is performed by comparing two different sets of computations. The first group accounts for a structural multi-body dynamics (MBD) model of the blades. The MBD solver was coupled to the CFD solver during run time with a staggered fluid–structure interaction (FSI) scheme. The second set of simulations uses the original rotor geometry, without accounting for any structural deflection. The results of the present work show no significant difference between the IDDES and the hybrid turbulence model. In a similar manner, and due to the fact that the considered rotor was relatively stiff, the loading variation introduced by the blade flexibility was found to be negligible when compared to the influence of inflow turbulence. The simulation method validated here is considered highly relevant for future turbine designs, where the impact of blade elasticity will be significant and the detailed structure of the atmospheric inflow will be important.

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Section: Fsi Frameworkmentioning

confidence: 99%

Section: Hawc2 Modelmentioning

confidence: 99%

Wind turbines in atmospheric flow: fluid–structure interaction simulations with hybrid turbulence modeling

Grinderslev

Sørensen²,

Horcas

et al. 2021

Wind Energ. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The two codes EllipSys3D and HAWC2 are coupled, in a partitioned manner, through the Python framework, referred to as the DTU coupling, originally created by Heinz (Heinz et al, 2016a) and further developed by G. Horcas and R. Garcia (Horcas et al, 2019;García Ramos et al, 2020). Through the use of the coupling framework, the BEM aerodynamics module of HAWC2 is replaced by an interface to the EllipSys3D CFD code.…”

Section: Fsi-frameworkmentioning

confidence: 99%

Wind turbines in atmospheric flow – FSI simulations with hybrid LES-IDDES turbulence modelling

Grinderslev¹,

Sørensen²,

Horcas³

et al. 2020

Preprint

Self Cite

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Abstract. In order to design future large wind turbines, knowledge is needed about the impact of aero-elasticity on the rotor loads and performance, and about the physics of the atmospheric flow surrounding the turbines. The objective of the present work is to study both effects by means of high fidelity rotor-resolved numerical simulations. In particular, unsteady computational fluid dynamics (CFD) simulations of a 2.3 MW wind turbine rotor are conducted, this rotor being the largest design with relevant experimental data available to the authors. Turbulence is modeled with two different approaches. On one hand, the well established improved delayed detached eddy simulation (IDDES) model is employed. An additional set of simulations relies on a novel hybrid turbulence model, developed within the framework of the present work. It consists on the blending of a large eddy simulation (LES) model for atmospheric flow by Deardorff with an IDDES model for the separated flow near the rotor geometry. In the same way, the assessment of the influence of the blade flexibility is performed by comparing two different sets of computations. A first group accounts for a structural multi body dynamic (MBD) model of the blades. The MBD solver was coupled to the CFD solver during run time with a staggered fluid structure interaction (FSI) scheme. The second set of simulations uses the original rotor geometry, without accounting for any structural deflection. The results of the present work show no significant difference between the IDDES and the hybrid turbulence model. However, it is expected that future simulations of more complex stratification and longer domains will benefit from the developed hybrid model. In a similar manner, and due to the fact that the considered rotor was relatively stiff, the loading variation introduced by the blade flexibility was found to be negligible when compared to the influence of inflow turbulence. The simulation method validated here is considered highly relevant for future turbine designs, where the impact of blade elasticity will be significant and the detailed structure of the atmospheric inflow will be important.

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“…The existing bibliography relevant to wind turbine applications typically focuses on winglets and aerodynamic tip shapes purely from an aerodynamics point of view (Johansen, 2006;Gaunaa, 2007;Ferrer, 2007;Chattot, 2009;Elfarra, 2014;Farhan, 2019;Matheswaran, 2019). Exceptions to this general trend are the recent articles Sessarego, 2018;Hansen, 2018;Rosemeier, 2020; that put the focus on general blade tip designs and aeroelastic performance. Moreover, there is no relevant research work focusing on performance and design loads of ro-tors with tip extensions relevant to real operational cases with a view towards a business case.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, there is no relevant research work focusing on performance and design loads of ro-tors with tip extensions relevant to real operational cases with a view towards a business case. Only in Rosemeier (2020) is the potential of blade tip extensions for lifetime extension evaluated through aeroelastic fatigue load cases.…”

Section: Introductionmentioning

confidence: 99%

Surrogate-based aeroelastic design optimization of tip extensions on a modern 10 MW wind turbine

Barlas

Ramos‐García²,

Pirrung

et al. 2021

Wind Energ. Sci.

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Abstract. Advanced aeroelastically optimized tip extensions are among rotor innovation concepts which could contribute to the higher performance and lower cost of wind turbines. A novel design optimization framework for wind turbine blade tip extensions based on surrogate aeroelastic modeling is presented. An academic wind turbine is modeled in an aeroelastic code equipped with a near-wake aerodynamic module, and tip extensions with complex shapes are parametrized using 11 design variables. The design space is explored via full aeroelastic simulations in extreme turbulence, and a surrogate model is fitted to the data. Direct optimization is performed based on the surrogate model seeking to maximize the power of the retrofitted turbine within the ultimate load constraints. The presented optimized design achieves a load-neutral gain of up to 6 % in annual energy production. Its performance is further evaluated in detail by means of the near-wake model used for the generation of the surrogate model and compared with a higher-fidelity aerodynamic module comprising a hybrid filament-particle-mesh vortex method with a lifting-line implementation. A good agreement between the solvers is obtained at low turbulence levels, while differences in predicted power and flapwise blade root bending moment grow with increasing turbulence intensity.

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Aero‐hydro‐servo‐elastic coupling of a multi‐body finite‐element solver and a multi‐fidelity vortex method

Cited by 20 publications

References 41 publications

Wind turbines in atmospheric flow: fluid–structure interaction simulations with hybrid turbulence modeling

Wind turbines in atmospheric flow: fluid–structure interaction simulations with hybrid turbulence modeling

Wind turbines in atmospheric flow – FSI simulations with hybrid LES-IDDES turbulence modelling

Surrogate-based aeroelastic design optimization of tip extensions on a modern 10 MW wind turbine

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