High-Order Numerical Simulations of Wind Turbine Wakes

Wake Conference 2017

Kleusberg, E.^1 ; Mikkelsen, R.F.^2 ; Schlatter, P.^1 ; Ivanell, S.^1,3 ; Henningson, D.S.^1

Linné FLOW Centre, Swedish E-Science Research Centre (SeRC), KTH Mechanics, Royal Institute of Technology, Stockholm

SE-100 44, Sweden^1

Technical University of Denmark, DTU Wind Energy, Kgs. Lyngby

2800, Denmark^2

Uppsala University, Wind Energy Section, Campus Gotland, Visby

SE-621 67, Sweden^3

关键词: Comparison with experiments;    Homogeneous isotropic turbulence;    Incompressible Navier Stokes equations;    Inflow boundary conditions;    Numerical dissipation;    Reynolds-averaged navier-stokes simulations;    Science and Technology;    Spectral element method;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/854/1/012025/pdf
DOI  :  10.1088/1742-6596/854/1/012025

来源: IOP

【 摘 要 】

Previous attempts to describe the structure of wind turbine wakes and their mutual interaction were mostly limited to large-eddy and Reynolds-averaged Navier-Stokes simulations using finite-volume solvers. We employ the higher-order spectral-element code Nek5000 to study the influence of numerical aspects on the prediction of the wind turbine wake structure and the wake interaction between two turbines. The spectral-element method enables an accurate representation of the vortical structures, with lower numerical dissipation than the more commonly used finite-volume codes. The wind-turbine blades are modeled as body forces using the actuator-line method (ACL) in the incompressible Navier-Stokes equations. Both tower and nacelle are represented with appropriate body forces. An inflow boundary condition is used which emulates homogeneous isotropic turbulence of wind-tunnel flows. We validate the implementation with results from experimental campaigns undertaken at the Norwegian University of Science and Technology (NTNU Blind Tests), investigate parametric influences and compare computational aspects with existing numerical simulations. In general the results show good agreement between the experiments and the numerical simulations both for a single-turbine setup as well as a two-turbine setup where the turbines are offset in the spanwise direction. A shift in the wake center caused by the tower wake is detected similar to experiments. The additional velocity deficit caused by the tower agrees well with the experimental data. The wake is captured well by Nek5000 in comparison with experiments both for the single wind turbine and in the two-turbine setup. The blade loading however shows large discrepancies for the high-turbulence, two-turbine case. While the experiments predicted higher thrust for the downstream turbine than for the upstream turbine, the opposite case was observed in Nek5000.