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Title: Comparison of four large-eddy simulation research codes and effects of model coefficient and inflow turbulence in actuator-line-based wind turbine modeling

Abstract

Here, large-eddy simulation (LES) of a wind turbine under uniform inflow is performed using an actuator line model (ALM). Predictions from four LES research codes from the wind energy community are compared. The implementation of the ALM in all codes is similar and quantities along the blades are shown to match closely for all codes. The value of the Smagorinsky coefficient in the subgrid-scale turbulence model is shown to have a negligible effect on the time-averaged loads along the blades. Conversely, the breakdown location of the wake is strongly dependent on the Smagorinsky coefficient in uniform laminar inflow. Simulations are also performed using uniform mean velocity inflow with added homogeneous isotropic turbulence from a public database. The time-averaged loads along the blade do not depend on the inflow turbulence. Moreover, and in contrast to the uniform inflow cases, the Smagorinsky coefficient has a negligible effect on the wake profiles. It is concluded that for LES of wind turbines and wind farms using ALM, careful implementation and extensive cross-verification among codes can result in highly reproducible predictions. Moreover, the characteristics of the inflow turbulence appear to be more important than the details of the subgrid-scale modeling employed in the wake, atmore » least for LES of wind energy applications at the resolutions tested in this work.« less

Authors:
 [1];  [2]; ORCiD logo [3];  [4];  [5];  [4];  [3];  [5]
  1. Johns Hopkins Univ., Baltimore, MD (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. KU Leuven, Leuven (Belgium)
  4. Technical Univ. of Denmark, Lygby (Denmark)
  5. Johns Hopkins Univ., Baltimore, MD (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
1439548
Alternate Identifier(s):
OSTI ID: 1437334
Report Number(s):
NREL/JA-5000-70928
Journal ID: ISSN 1941-7012
Grant/Contract Number:
AC36-08GO28308
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Renewable and Sustainable Energy
Additional Journal Information:
Journal Volume: 10; Journal Issue: 3; Journal ID: ISSN 1941-7012
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; wind energy; wind turbine; actuator line model; large-eddy simulation; Smagorinsky model

Citation Formats

Martinez-Tossas, Luis A., Churchfield, Matthew J., Yilmaz, Ali Emre, Sarlak, Hamid, Johnson, Perry L., Sorensen, Jens N., Meyers, Johan, and Meneveau, Charles. Comparison of four large-eddy simulation research codes and effects of model coefficient and inflow turbulence in actuator-line-based wind turbine modeling. United States: N. p., 2018. Web. doi:10.1063/1.5004710.
Martinez-Tossas, Luis A., Churchfield, Matthew J., Yilmaz, Ali Emre, Sarlak, Hamid, Johnson, Perry L., Sorensen, Jens N., Meyers, Johan, & Meneveau, Charles. Comparison of four large-eddy simulation research codes and effects of model coefficient and inflow turbulence in actuator-line-based wind turbine modeling. United States. doi:10.1063/1.5004710.
Martinez-Tossas, Luis A., Churchfield, Matthew J., Yilmaz, Ali Emre, Sarlak, Hamid, Johnson, Perry L., Sorensen, Jens N., Meyers, Johan, and Meneveau, Charles. Wed . "Comparison of four large-eddy simulation research codes and effects of model coefficient and inflow turbulence in actuator-line-based wind turbine modeling". United States. doi:10.1063/1.5004710.
@article{osti_1439548,
title = {Comparison of four large-eddy simulation research codes and effects of model coefficient and inflow turbulence in actuator-line-based wind turbine modeling},
author = {Martinez-Tossas, Luis A. and Churchfield, Matthew J. and Yilmaz, Ali Emre and Sarlak, Hamid and Johnson, Perry L. and Sorensen, Jens N. and Meyers, Johan and Meneveau, Charles},
abstractNote = {Here, large-eddy simulation (LES) of a wind turbine under uniform inflow is performed using an actuator line model (ALM). Predictions from four LES research codes from the wind energy community are compared. The implementation of the ALM in all codes is similar and quantities along the blades are shown to match closely for all codes. The value of the Smagorinsky coefficient in the subgrid-scale turbulence model is shown to have a negligible effect on the time-averaged loads along the blades. Conversely, the breakdown location of the wake is strongly dependent on the Smagorinsky coefficient in uniform laminar inflow. Simulations are also performed using uniform mean velocity inflow with added homogeneous isotropic turbulence from a public database. The time-averaged loads along the blade do not depend on the inflow turbulence. Moreover, and in contrast to the uniform inflow cases, the Smagorinsky coefficient has a negligible effect on the wake profiles. It is concluded that for LES of wind turbines and wind farms using ALM, careful implementation and extensive cross-verification among codes can result in highly reproducible predictions. Moreover, the characteristics of the inflow turbulence appear to be more important than the details of the subgrid-scale modeling employed in the wake, at least for LES of wind energy applications at the resolutions tested in this work.},
doi = {10.1063/1.5004710},
journal = {Journal of Renewable and Sustainable Energy},
number = 3,
volume = 10,
place = {United States},
year = {Wed May 16 00:00:00 EDT 2018},
month = {Wed May 16 00:00:00 EDT 2018}
}

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