Near-wake analysis of actuator line method immersed in turbulent flow using large-eddy simulations
| Autor: | Jörn Nathan, Louis Dufresne, Christian Masson |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
020209 energy
lcsh:TJ807-830 lcsh:Renewable energy sources Energy Engineering and Power Technology 02 engineering and technology Computational fluid dynamics Wake 7. Clean energy 01 natural sciences 010305 fluids & plasmas law.invention Physics::Fluid Dynamics law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Wind tunnel Homogeneous isotropic turbulence Wind power Renewable Energy Sustainability and the Environment business.industry Turbulence Rotor (electric) Mechanics Environmental science business Actuator |
| Zdroj: | Wind Energy Science, Vol 3, Pp 905-917 (2018) |
| ISSN: | 2366-7451 2366-7443 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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