Comparison of OpenFOAM and EllipSys3D actuator line methods with (NEW) MEXICO results

Nathan, Jörn; Forsting, Alexander Meyer; Troldborg, Niels; Masson, Christian

doi:10.1088/1742-6596/854/1/012033

Cited by 12 publications

(18 citation statements)

References 8 publications

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“…A very interesting observation is the fact that for higher turbulence intensities the effects of the distinct blades using the ALM seems to vanish at relatively short downstream distances. By using a validated actuator line implementation (Nathan et al, 2017), it was shown that the distribution width /∆x has a non-linear dependence on the grid resolution and converges probably towards values suggested in Martínez-Tossas et al…”

supporting

confidence: 59%

“…Due to the relatively low resolution, the shed tip vortices from an ALM are much larger than the ones observed experimentally. Hence the induction caused by the simulated vortices is weaker than in reality and the Glauert tip correction permits to compensate for it (Nathan et al, 2017 Finally in order to avoid spurious oscillations around the point of the inserted force, the punctual force is distributed using a kernel G * (·). As done in previous works such as Troldborg (2009) or Olivares Espinosa (2017 this work adheres to a normal distribution with the distribution width = σ∆x.…”

Section: Rotor Modelmentioning

confidence: 99%

“…The implementation was validated against EllipSys3D and verified against the MEXICO and NEW MEXICO experiment in Nathan et al (2017). A comparison of the axial profiles of the velocity components can be seen …”

Section: Validation and Verificationmentioning

confidence: 99%

“…In order to evaluate the soundness of the present method a comparative study of the SOWFA framework, from NREL, and EllipSys3D, from DTU, was conducted as initally presented in Nathan et al (2017). Based on this study, the method used throughout this work will be evaluated before proceeding to establish the base case for the non-turbulent inflow.…”

mentioning

confidence: 99%

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Near wake analysis of actuator line method immersed in turbulent flow using large-eddy simulations

Nathan¹,

Masson²,

Dufresne³

2018

Preprint

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Abstract. The interaction between wind turbines through their wakes is an important aspect of the conception and operation of a wind farm. Wakes are characterized by an elevated turbulence level and a noticable velocity deficit which causes a decrease in energy output and fatigue on downstream turbines. In order to gain a better understanding of this phenomenon this works uses large-eddy simulations together with an actuator line model and different ambient turbulences imposed as boundary conditions. This is achieved by using the SOWFA framework from NREL (USA) which is first validated against another popular CFD 5 framework for wind energy, EllipSys3D, and then verified against the experimental results from the MEXICO and NEW MEXICO wind tunnel experiments. By using the predicted torque as a global indicator, the optimal width of the distribution kernel for the actuator line is determined for different grid resolutions. Then the rotor is immersed in homogeneous isotropic turbulence and a shear layer turbulence with different turbulence intensities, allowing to determine how far downstream the effect of the distinct blades is discernible. This can be used as an indicator for the extents of the near wake for different flow 10 conditions.

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supporting

confidence: 59%

Section: Rotor Modelmentioning

confidence: 99%

Section: Validation and Verificationmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Near wake analysis of actuator line method immersed in turbulent flow using large-eddy simulations

Nathan¹,

Masson²,

Dufresne³

2018

Preprint

View full text Add to dashboard Cite

show abstract

“…In order to evaluate the soundness of the present method, a comparative study of the Simulator fOr Wind Farm Applications (SOWFA) framework, from the National Renewable Energy Laboratory (NREL), and EllipSys3D, from DTU, was conducted as initially presented in Nathan et al (2017). Based on this study, the method used throughout this work will be evaluated before proceeding to establish the base case for the non-turbulent inflow.…”

Section: Introductionmentioning

confidence: 99%

Near-wake analysis of actuator line method immersed in turbulent flow using large-eddy simulations

Nathan¹,

Masson²,

Dufresne³

2018

Wind Energ. Sci.

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Abstract. The interaction between wind turbines through their wakes is an important aspect of the conception and operation of a wind farm. Wakes are characterized by an elevated turbulence level and a noticeable velocity deficit, which causes a decrease in energy output and fatigue on downstream turbines. In order to gain a better understanding of this phenomenon this work uses large-eddy simulations together with an actuator line model and different ambient turbulence imposed as boundary conditions. This is achieved by using the Simulator fOr Wind Farm Applications (SOWFA) framework from the National Renewable Energy Laboratory (NREL) (USA), which is first validated against another popular Computational Fluid Dynamics (CFD) framework for wind energy, EllipSys3D, and then verified against the experimental results from the Model Experiment in Controlled Conditions (MEXICO) and New Model Experiment in Controlled Conditions (NEW MEXICO) wind tunnel experiments. By using the predicted torque as a global indicator, the optimal width of the distribution kernel for the actuator line is determined for different grid resolutions. Then, the rotor is immersed in homogeneous isotropic turbulence and a shear layer turbulence with different turbulence intensities, allowing us to determine how far downstream the effect of the distinct blades is discernible. This can be used as an indicator of the extents of the near wake for different flow conditions.

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Large-Eddy Simulation of a wind turbine using a Filtered Actuator Line Model

Stanly

Martínez‐Tossas

Frankel

et al. 2022

Journal of Wind Engineering and Industrial Aerodynamics

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Comparison of OpenFOAM and EllipSys3D actuator line methods with (NEW) MEXICO results

Cited by 12 publications

References 8 publications

Near wake analysis of actuator line method immersed in turbulent flow using large-eddy simulations

Near wake analysis of actuator line method immersed in turbulent flow using large-eddy simulations

Near-wake analysis of actuator line method immersed in turbulent flow using large-eddy simulations

Large-Eddy Simulation of a wind turbine using a Filtered Actuator Line Model

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