### Abstract

When using an actuator-line representation of a wind turbine for computational fluid dynamics, it is common practice to volumetrically project the line force onto the flow field to create a body force in the fluid momentum equation. The objective of this study is to investigate how different volumetric projection techniques of the body force created by an actuator-line wind turbine rotor model affect the generated wake characteristics and blade loads in a turbine-turbine interaction problem. Two techniques for the body-force projection width are used, and they are based on either i) the grid spacing, or ii) the combination of grid spacing and an equivalent elliptic blade planform. An array of two NREL 5-MW turbines separated by seven rotor diameters is simulated within a large-eddy simulation solver subject to offshore neutral and moderately-convective atmospheric boundary-layer inflow. Power, thrust, and bending moment histories of both turbines, the statistics of angle of attack and blade loads over 2000 sec, variations in the mean and fluctuating velocity components, and turbulent kinetic energy and selected Reynolds stresses along vertical and spanwise sampling locations in the wake are analyzed. Comparisons for the different techniques of determining the body-force projection width of the actuator-line method are made and their effect on different physical quantities are assessed.

Original language | English (US) |
---|---|

State | Published - Feb 28 2014 |

Event | 32nd ASME Wind Energy Symposium - SciTech Forum and Exposition 2014 - National Harbor, MD, United States Duration: Jan 13 2014 → Jan 17 2014 |

### Other

Other | 32nd ASME Wind Energy Symposium - SciTech Forum and Exposition 2014 |
---|---|

Country | United States |

City | National Harbor, MD |

Period | 1/13/14 → 1/17/14 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Renewable Energy, Sustainability and the Environment
- Mechanical Engineering

### Cite this

*The effect of various actuator-line modeling approaches on turbine-turbine interactions and wake-turbulence statistics in atmospheric boundary-layer flow*. Paper presented at 32nd ASME Wind Energy Symposium - SciTech Forum and Exposition 2014, National Harbor, MD, United States.

}

**The effect of various actuator-line modeling approaches on turbine-turbine interactions and wake-turbulence statistics in atmospheric boundary-layer flow.** / Jha, Pankaj K.; Churchfield, Matthew J.; Moriarty, Patrick J.; Schmitz, Sven.

Research output: Contribution to conference › Paper

TY - CONF

T1 - The effect of various actuator-line modeling approaches on turbine-turbine interactions and wake-turbulence statistics in atmospheric boundary-layer flow

AU - Jha, Pankaj K.

AU - Churchfield, Matthew J.

AU - Moriarty, Patrick J.

AU - Schmitz, Sven

PY - 2014/2/28

Y1 - 2014/2/28

N2 - When using an actuator-line representation of a wind turbine for computational fluid dynamics, it is common practice to volumetrically project the line force onto the flow field to create a body force in the fluid momentum equation. The objective of this study is to investigate how different volumetric projection techniques of the body force created by an actuator-line wind turbine rotor model affect the generated wake characteristics and blade loads in a turbine-turbine interaction problem. Two techniques for the body-force projection width are used, and they are based on either i) the grid spacing, or ii) the combination of grid spacing and an equivalent elliptic blade planform. An array of two NREL 5-MW turbines separated by seven rotor diameters is simulated within a large-eddy simulation solver subject to offshore neutral and moderately-convective atmospheric boundary-layer inflow. Power, thrust, and bending moment histories of both turbines, the statistics of angle of attack and blade loads over 2000 sec, variations in the mean and fluctuating velocity components, and turbulent kinetic energy and selected Reynolds stresses along vertical and spanwise sampling locations in the wake are analyzed. Comparisons for the different techniques of determining the body-force projection width of the actuator-line method are made and their effect on different physical quantities are assessed.

AB - When using an actuator-line representation of a wind turbine for computational fluid dynamics, it is common practice to volumetrically project the line force onto the flow field to create a body force in the fluid momentum equation. The objective of this study is to investigate how different volumetric projection techniques of the body force created by an actuator-line wind turbine rotor model affect the generated wake characteristics and blade loads in a turbine-turbine interaction problem. Two techniques for the body-force projection width are used, and they are based on either i) the grid spacing, or ii) the combination of grid spacing and an equivalent elliptic blade planform. An array of two NREL 5-MW turbines separated by seven rotor diameters is simulated within a large-eddy simulation solver subject to offshore neutral and moderately-convective atmospheric boundary-layer inflow. Power, thrust, and bending moment histories of both turbines, the statistics of angle of attack and blade loads over 2000 sec, variations in the mean and fluctuating velocity components, and turbulent kinetic energy and selected Reynolds stresses along vertical and spanwise sampling locations in the wake are analyzed. Comparisons for the different techniques of determining the body-force projection width of the actuator-line method are made and their effect on different physical quantities are assessed.

UR - http://www.scopus.com/inward/record.url?scp=84894472727&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84894472727&partnerID=8YFLogxK

M3 - Paper

ER -