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Title: Simulating effects of a wind-turbine array using LES and RANS: Simulating turbines using LES and RANS

Abstract

Growth in wind power production has motivated investigation of wind-farm impacts on in situ flow fields and downstream interactions with agriculture and other wind farms. These impacts can be simulated with both large-eddy simulations (LES) and mesoscale wind-farm parameterizations (WFP). The Weather Research and Forecasting (WRF) model offers both approaches. We used the validated generalized actuator disk (GAD) parameterization in WRF-LES to assess WFP performance. A 12-turbine array was simulated using the GAD model and the WFP in WRF. We examined the performance of each scheme in both convective and stable conditions. The GAD model and WFP produced qualitatively similar wind speed deficits and turbulent kinetic energy (TKE) production across the array in both stability regimes, though the magnitudes of velocity deficits and TKE production levels were underestimated and overestimated, respectively. While wake growth slowed in the latter half of the WFP array as expected, wakes did not approach steady state by the end of the array as simulated by the GAD model. A sensitivity test involving the deactivation of explicit TKE production by the WFP resulted in turbulence levels within the array well that were below those produced by the GAD in both stable and unstable conditions. Finally, themore » WFP overestimated downwind power production deficits in stable conditions because of the lack of wake stabilization in the latter half of the array.« less

Authors:
 [1];  [2];  [3];  [4]
  1. Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder Colorado USA; Now at National Center for Atmospheric Research, Boulder Colorado USA
  2. National Center for Atmospheric Research, Boulder Colorado USA
  3. Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder Colorado USA; National Renewable Energy Laboratory, Golden Colorado USA
  4. Lawrence Livermore National Laboratory, Livermore California USA
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1377803
Report Number(s):
NREL/JA-5000-70007
Journal ID: ISSN 1942-2466
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Advances in Modeling Earth Systems; Journal Volume: 8; Journal Issue: 3
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; wind-farm parameterization; LES; RANS; actuator-disk model; WRF; turbine wakes

Citation Formats

Vanderwende, Brian J., Kosović, Branko, Lundquist, Julie K., and Mirocha, Jeffrey D.. Simulating effects of a wind-turbine array using LES and RANS: Simulating turbines using LES and RANS. United States: N. p., 2016. Web. doi:10.1002/2016MS000652.
Vanderwende, Brian J., Kosović, Branko, Lundquist, Julie K., & Mirocha, Jeffrey D.. Simulating effects of a wind-turbine array using LES and RANS: Simulating turbines using LES and RANS. United States. doi:10.1002/2016MS000652.
Vanderwende, Brian J., Kosović, Branko, Lundquist, Julie K., and Mirocha, Jeffrey D.. Sat . "Simulating effects of a wind-turbine array using LES and RANS: Simulating turbines using LES and RANS". United States. doi:10.1002/2016MS000652.
@article{osti_1377803,
title = {Simulating effects of a wind-turbine array using LES and RANS: Simulating turbines using LES and RANS},
author = {Vanderwende, Brian J. and Kosović, Branko and Lundquist, Julie K. and Mirocha, Jeffrey D.},
abstractNote = {Growth in wind power production has motivated investigation of wind-farm impacts on in situ flow fields and downstream interactions with agriculture and other wind farms. These impacts can be simulated with both large-eddy simulations (LES) and mesoscale wind-farm parameterizations (WFP). The Weather Research and Forecasting (WRF) model offers both approaches. We used the validated generalized actuator disk (GAD) parameterization in WRF-LES to assess WFP performance. A 12-turbine array was simulated using the GAD model and the WFP in WRF. We examined the performance of each scheme in both convective and stable conditions. The GAD model and WFP produced qualitatively similar wind speed deficits and turbulent kinetic energy (TKE) production across the array in both stability regimes, though the magnitudes of velocity deficits and TKE production levels were underestimated and overestimated, respectively. While wake growth slowed in the latter half of the WFP array as expected, wakes did not approach steady state by the end of the array as simulated by the GAD model. A sensitivity test involving the deactivation of explicit TKE production by the WFP resulted in turbulence levels within the array well that were below those produced by the GAD in both stable and unstable conditions. Finally, the WFP overestimated downwind power production deficits in stable conditions because of the lack of wake stabilization in the latter half of the array.},
doi = {10.1002/2016MS000652},
journal = {Journal of Advances in Modeling Earth Systems},
number = 3,
volume = 8,
place = {United States},
year = {Sat Aug 27 00:00:00 EDT 2016},
month = {Sat Aug 27 00:00:00 EDT 2016}
}