Aeroelastic analysis of wind turbines  under turbulent inflow conditions

Guma, Giorgia; Bangga, Galih; Lutz, Thorsten; Krämer, Ewald

doi:10.5194/wes-6-93-2021

Cited by 22 publications

(16 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The tower will mainly influence the inboard loading, while the outboard loading will be dominated by the velocity shear. This is supported by the findings of Guma et al 10 . of the same wind turbine.…”

Section: Methodssupporting

confidence: 85%

“…Tower shadow is found to affect very locally around the azimuthal range when the blade passes the tower, and simulations with and without tower yielding very similar results in the remaining part of the revolution. Recently, Guma et al 10 . published a study looking into the aeroelastic response of the NM80 rotor, also studied in the present article, in turbulent inflow.…”

Section: Introductionmentioning

confidence: 90%

See 1 more Smart Citation

Fluid–structure interaction simulations of a wind turbine rotor in complex flows, validated through field experiments

2021

View full text Add to dashboard Cite

Aeroelastic simulations of a 2.3 MW wind turbine rotor operating in different complex atmospheric flows are conducted using high fidelity fluid–structure interaction (FSI) simulations. Simpler blade element momentum (BEM) theory based simulations are likewise conducted for comparison, and measurements from field experiments are used for validation of the simulations. Good agreement is seen between simulated and measured forces. It is found that for complex flows, BEM‐based simulations predict similar forces as computational fluid dynamics (CFD)‐based FSI, however with some distinct discrepancies. Firstly, stall is predicted for a large part of the blade using BEM‐based aerodynamics, which are not seen in either FSI simulations or measurements in the case of a high shear. This leads to a more dynamic structural response for BEM‐based simulations than for FSI. For a highly yawed and sheared flow case, the BEM‐based simulations overpredict outboard forces for a significant part of the rotation. This emphasizes the need of validation of BEM‐based simulations through higher fidelity methods, when considering complex flows. Including flexibility in simulations shows only little impact on the considered rotor for both FSI‐ and BEM‐based simulations. In general, the loading of the blades increases slightly, and the rotor wake is almost identical for stiff and flexible FSI simulations.

show abstract

Section: Methodssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 90%

Fluid–structure interaction simulations of a wind turbine rotor in complex flows, validated through field experiments

2021

View full text Add to dashboard Cite

show abstract

“…SIMPACK has recently been used by industrial and research groups for the simulation of wind turbines, e.g. Luhmann et al (2017) and Guma et al (2021).…”

Section: Structural Solver -Simpackmentioning

confidence: 99%

Impact of the wind field at the complex terrain site Perdigão on the surface pressure fluctuations of a wind turbine

Wenz

Langner²,

Lutz

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract. The influence of turbulent inflow, as it occurs in complex terrain, on the unsteady surface pressure distributions on a wind turbine is investigated numerically. A method is presented that enables an accurate reproduction of the inflow to the turbine in the complex terrain in Perdigao, Portugal. For this purpose, a precursor simulation with the steady-state atmospheric computational fluid dynamics (CFD) code E-Wind and a high-resolution Delayed Detached Eddy Simulation (DDES) with FLOWer is performed. The conservation of the flow field is validated by a comparison with measurements from the 2017 field campaign in Perdigao. Then, the resolved fluid-structure coupled generic wind turbine I82 is included in the FLOWer simulation to investigate the impact of the complex terrain inflow on the surface pressure fluctuations on tower and blades. A comparison with simulations of the same turbine in flat terrain with simpler inflows shows that the turbine in complex terrain has a significantly different vortex shedding at the tower, which dominates the periodic pressure fluctuations at the tower sides and back. However, the dominant source of periodic pressure fluctuations on the upper part of the tower, the blade-tower interaction, is hardly altered by the terrain flow. The pressure fluctuations on the blade have a rather broadband characteristic, caused by the interaction of the leading edge with the inflow turbulence. In general, it is shown that a sophisticated DDES of the complex terrain plays a decisive role in the unsteady aerodynamics of the turbine, due to its specific flow characteristic.

show abstract

“…4. The omission of these elements is expected to have a minor effect, supported by Guma et al (2021), who studied the same rotor represented both as a rotor only and as a full turbine. Near the rotor, an O-O type mesh is grown from the blade surface, extruding ≈ 15 m, discretized with 128 cells from the surface using the grid generator HypGrid (Sørensen, 1998).…”

Section: Successor Simulationmentioning

confidence: 93%

“…Additionally, the study concluded that, for the specific turbine and flow cases, inclusion of blade flexibility does not highly impact the wake behavior, whereas inflow turbulence has high impacts on wake diffusion. Guma et al (2021) recently published a study looking into the aero-elastic response of the NM80 rotor, also studied in the present article, in turbulent inflow. Here, synthetic Mann box turbulence and the delayed detached eddy simulation (DDES) turbulence model were used to create and resolve turbulent structures in the wind flow.…”

Section: Introductionmentioning

confidence: 99%

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

Grinderslev

Sørensen²,

Horcas

et al. 2021

Wind Energ. Sci.

View full text Add to dashboard Cite

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.

show abstract

Aeroelastic analysis of wind turbines under turbulent inflow conditions

Cited by 22 publications

References 26 publications

Fluid–structure interaction simulations of a wind turbine rotor in complex flows, validated through field experiments

Fluid–structure interaction simulations of a wind turbine rotor in complex flows, validated through field experiments

Impact of the wind field at the complex terrain site Perdigão on the surface pressure fluctuations of a wind turbine

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

Contact Info

Product

Resources

About