Wind Turbine Wakes and Clusters (JNS)
Wind turbines are today mostly grouped in clusters to reduce the overall installation and maintenance expenses. As a consequence, the turbulence intensity in the wake increases, which enhances the dynamic loadings and decreases the overall power yield of the turbines.
Furthermore, the structure of the turbulence changes which makes more comprehensive modelling necessary. In this task Navier-Stokes methods will be used to simulate the turbulent wakes and turbine to turbine interaction and their influence on rotor performance. The computations will be carried out using LES (Large Eddy Simulation) and DES (Detached Eddy Simulation) techniques and will include turbulent inflow conditions and shear/gradient effects from the atmospheric boundary layer. In these simulations, the rotor disc will be approximated by the actuator line technique.
Expected results: New insight into turbulent wake structures, including wake to wake interaction. Development of dynamic wake and parabolised Navier-Stokes models.
Milestones; Task 2 (JNS)
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Milestone
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Description
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Month
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Status
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M7
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Study of far wakes behind single turbine, comparison with experiments and results from Task-1. (Actuator Disk/Line)
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24
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Completed
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M8
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Refined model for the far wake
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24
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Completed
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M9
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Parabolized stand-alone N-S park model
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14
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Completed
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M10
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Parametric study of the wake stability for varying inflow turbulence, and comparison with M6 (Actuator Disk/Line formulation)
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38
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Completed
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M11
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Refined modeling in the framework of Dynamic Wake Modeling, using input from M7 and M10.
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48
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Completed
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M12
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Parametric study of the wake/wake interaction between two or more turbines, compared to experiments. (Resolved geometry and Actuator Disk/Line formulation).
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36
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Completed
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