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Title: Turbulent kinetics of a large wind farm and their impact in the neutral boundary layer

High-resolution large-eddy simulation of the flow over a large wind farm (64 wind turbines) is performed using the HIGRAD/FIRETEC-WindBlade model, which is a high-performance computing wind turbine–atmosphere interaction model that uses the Lagrangian actuator line method to represent rotating turbine blades. These high-resolution large-eddy simulation results are used to parameterize the thrust and power coefficients that contain information about turbine interference effects within the wind farm. Those coefficients are then incorporated into the WRF (Weather Research and Forecasting) model in order to evaluate interference effects in larger-scale models. In the high-resolution WindBlade wind farm simulation, insufficient distance between turbines creates the interference between turbines, including significant vertical variations in momentum and turbulent intensity. The characteristics of the wake are further investigated by analyzing the distribution of the vorticity and turbulent intensity. Quadrant analysis in the turbine and post-turbine areas reveals that the ejection motion induced by the presence of the wind turbines is dominant compared to that in the other quadrants, indicating that the sweep motion is increased at the location where strong wake recovery occurs. Regional-scale WRF simulations reveal that although the turbulent mixing induced by the wind farm is partly diffused to the upper region, there is nomore » significant change in the boundary layer depth. The velocity deficit does not appear to be very sensitive to the local distribution of turbine coefficients. However, differences of about 5% on parameterized turbulent kinetic energy were found depending on the turbine coefficient distribution. Furthermore, turbine coefficients that consider interference in the wind farm should be used in wind farm parameterization for larger-scale models to better describe sub-grid scale turbulent processes.« less
 [1] ;  [2] ;  [2] ;  [3] ;  [2] ;  [1]
  1. Yonsei Univ., Seoul (Republic of Korea)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Korea Institute of Atmospheric Prediction System (KIAPS), Seoul (Republic of Korea)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0360-5442; PII: S036054421501590X
Grant/Contract Number:
2013R1A2A2A01015333; 2015R1A5A1037668; 20100040DR; AC52-06NA25396
Accepted Manuscript
Journal Name:
Energy (Oxford)
Additional Journal Information:
Journal Name: Energy (Oxford); Journal Volume: 95; Journal Issue: C; Journal ID: ISSN 0360-5442
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
Country of Publication:
United States
17 WIND ENERGY; large wind farm; actuator line method; large-eddy simulation; regional-scale simulation; wind farm parameterization; neutral boundary layer