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Title: Implementation of a generalized actuator line model for wind turbine parameterization in the Weather Research and Forecasting model

A generalized actuator line (GAL) wind turbine parameterization is implemented within the Weather Research and Forecasting model to enable high-fidelity large-eddy simulations of wind turbine interactions with boundary layer flows under realistic atmospheric forcing conditions. Numerical simulations using the GAL parameterization are evaluated against both an already implemented generalized actuator disk (GAD) wind turbine parameterization and two field campaigns that measured the inflow and near-wake regions of a single turbine. The representation of wake wind speed, variance, and vorticity distributions is examined by comparing fine-resolution GAL and GAD simulations and GAD simulations at both fine and coarse-resolutions. The higher-resolution simulations show slightly larger and more persistent velocity deficits in the wake and substantially increased variance and vorticity when compared to the coarse-resolution GAD. The GAL generates distinct tip and root vortices that maintain coherence as helical tubes for approximately one rotor diameter downstream. Coarse-resolution simulations using the GAD produce similar aggregated wake characteristics to both fine-scale GAD and GAL simulations at a fraction of the computational cost. Furthermore, the GAL parameterization provides the capability to resolve near wake physics, including vorticity shedding and wake expansion.
Authors:
 [1] ;  [2] ; ORCiD logo [3] ;  [4] ;  [5]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. Corp. for Atmospheric Research, Boulder, CO (United States)
  4. Univ. of Colorado, Boulder, CO (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
  5. Univ. of California, Berkeley, CA (United States)
Publication Date:
Report Number(s):
NREL/JA-5000-71250
Journal ID: ISSN 1941-7012
Grant/Contract Number:
AC36-08GO28308; AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Journal of Renewable and Sustainable Energy
Additional Journal Information:
Journal Volume: 9; Journal Issue: 6; Journal ID: ISSN 1941-7012
Publisher:
American Institute of Physics (AIP)
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), NREL Alliance Partner University Program (APUP); USDOE
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; aerodynamics; turbulent flows; vortex dynamics; eddies
OSTI Identifier:
1431425
Alternate Identifier(s):
OSTI ID: 1414604

Marjanovic, Nikola, Mirocha, Jeffrey D., Kosovic, Branko, Lundquist, Julie K., and Chow, Fotini Katopodes. Implementation of a generalized actuator line model for wind turbine parameterization in the Weather Research and Forecasting model. United States: N. p., Web. doi:10.1063/1.4989443.
Marjanovic, Nikola, Mirocha, Jeffrey D., Kosovic, Branko, Lundquist, Julie K., & Chow, Fotini Katopodes. Implementation of a generalized actuator line model for wind turbine parameterization in the Weather Research and Forecasting model. United States. doi:10.1063/1.4989443.
Marjanovic, Nikola, Mirocha, Jeffrey D., Kosovic, Branko, Lundquist, Julie K., and Chow, Fotini Katopodes. 2017. "Implementation of a generalized actuator line model for wind turbine parameterization in the Weather Research and Forecasting model". United States. doi:10.1063/1.4989443.
@article{osti_1431425,
title = {Implementation of a generalized actuator line model for wind turbine parameterization in the Weather Research and Forecasting model},
author = {Marjanovic, Nikola and Mirocha, Jeffrey D. and Kosovic, Branko and Lundquist, Julie K. and Chow, Fotini Katopodes},
abstractNote = {A generalized actuator line (GAL) wind turbine parameterization is implemented within the Weather Research and Forecasting model to enable high-fidelity large-eddy simulations of wind turbine interactions with boundary layer flows under realistic atmospheric forcing conditions. Numerical simulations using the GAL parameterization are evaluated against both an already implemented generalized actuator disk (GAD) wind turbine parameterization and two field campaigns that measured the inflow and near-wake regions of a single turbine. The representation of wake wind speed, variance, and vorticity distributions is examined by comparing fine-resolution GAL and GAD simulations and GAD simulations at both fine and coarse-resolutions. The higher-resolution simulations show slightly larger and more persistent velocity deficits in the wake and substantially increased variance and vorticity when compared to the coarse-resolution GAD. The GAL generates distinct tip and root vortices that maintain coherence as helical tubes for approximately one rotor diameter downstream. Coarse-resolution simulations using the GAD produce similar aggregated wake characteristics to both fine-scale GAD and GAL simulations at a fraction of the computational cost. Furthermore, the GAL parameterization provides the capability to resolve near wake physics, including vorticity shedding and wake expansion.},
doi = {10.1063/1.4989443},
journal = {Journal of Renewable and Sustainable Energy},
number = 6,
volume = 9,
place = {United States},
year = {2017},
month = {12}
}

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