A concurrent precursor inflow method for Large Eddy Simulations and applications to finite length wind farms |
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| Affiliation: | 1. Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA;2. Department of Physics, Mesa+ Institute, and J. M. Burgers Centre for Fluid Dynamics, University of Twente, Enschede 7500 AE, The Netherlands;1. Energy Research Centre of the Netherlands (ECN), Petten 1755 ZG, The Netherlands;2. Delft University of Technology (TU Delft), Delft 2629 HS, The Netherlands;3. Eindhoven University of Technology (TU Eindhoven), Eindhoven 5600 MB, The Netherlands;1. Uppsala University Campus Gotland, Wind Energy, Cramérgatan 3, 62165 Visby, Sweden;2. École de technologie supérieure, Department of Mechanical Engineering, 1100 Notre-Dame Ouest, Montréal, Québec H3C 1K3, Canada;1. Dept. of Aerodynamics Wind Energy Flight Performance and Propulsion, Delft University of Technology, Delft, 2629 HS, The Netherlands;2. Dept. of Mechanical Engineering & Center for Environmental and Applied Fluid Mechanics, Johns Hopkins University, Baltimore, MD, 21218, USA;3. Dept. of Wind Energy, Technical University of Denmark, 2800, Kongens Lyngby, Denmark;4. Dept. of Physics, Mesa+ Institute, and J. M. Burgers Centre for Fluid Dynamics, University of Twente, 7500 AE, Enschede, The Netherlands;5. Energy Research Centre of the Netherlands (ECN), 1755 ZG, Petten, The Netherlands;6. Dept. of Mechanical Engineering, Katholieke Universiteit Leuven, Celestijnenlaan 300 A, B3001, Leuven, Belgium;1. Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA;2. Center for Environmental and Applied Fluid Mechanics, Johns Hopkins University, Baltimore, MD 21218, USA;3. Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA;4. St. Anthony Falls Laboratory, University of Minnesota, Minneapolis, MN 55414, USA |
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| Abstract: | In order to enable simulations of developing wind turbine array boundary layers with highly realistic inflow conditions a concurrent precursor method for Large Eddy Simulations is proposed. In this method we consider two domains simultaneously, i.e. in one domain a turbulent Atmospheric Boundary Layer (ABL) without wind turbines is simulated in order to generate the turbulent inflow conditions for a second domain in which the wind turbines are placed. The benefit of this approach is that a) it avoids the need for large databases in which the turbulent inflow conditions are stored and the correspondingly slow I/O operations and b) we are sure that the simulations are not negatively affected by statically swept fixed inflow fields or synthetic fields lacking the proper ABL coherent structures. Sample applications are presented, in which, in agreement with field data a strong decrease of the power output of downstream wind-turbines with respect to the first row of wind-turbines is observed for perfectly aligned inflow. |
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| Keywords: | Wind-farm simulations Large Eddy Simulation Precursor simulation Inflow conditions |
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