CFD modelling approaches against single wind turbine wake measurements using RANS

The Science of Making Torque from Wind

Stergiannis, N.^1,2,3 ; Lacor, C.^1 ; Beeck, J.V.^1 ; Donnelly, R.^1

Vrije Universiteit Brussel, Department of Mechanical Engineering, Fluid Dynamics and Thermodynamics Research Group, Pleinlaan 2, Brussels

1050, Belgium^1

Von Karman Institute for Fluid Dynamics, Department of Environmental and Applied Fluid Dynamics, Waterloosesteenweg 72, Brussels

1640, Belgium^2

E S.A., Kalkkaai 6 Quai la Chaux, Brussels

1000, Belgium^3

关键词: Computational fluid dynamics simulations;    Computational mesh;    Multiple-reference frames;    Open source platforms;    Reynolds averaged Navier Stokes (RANS)equations;    Rotating reference frame;    Wind tunnel measurements;    Wind turbine rotors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/3/032062/pdf
DOI  :  10.1088/1742-6596/753/3/032062

来源: IOP

【 摘 要 】

Numerical simulations of two wind turbine generators including the exact geometry of their blades and hub are compared against a simplified actuator disk model (ADM). The wake expansion of the upstream rotor is investigated and compared with measurements. Computational Fluid Dynamics (CFD) simulations have been performed using the open-source platform OpenFOAM [1]. The multiple reference frame (MRF) approach was used to model the inner rotating reference frames in a stationary computational mesh and outer reference frame for the full wind turbine rotor simulations. The standard k -and k - ω turbulence closure schemes have been used to solve the steady state, three dimensional Reynolds Averaged Navier- Stokes (RANS) equations. Results of near and far wake regions are compared with wind tunnel measurements along three horizontal lines downstream. The ADM under-predicted the velocity deficit at the wake for both turbulence models. Full wind turbine rotor simulations showed good agreement against the experimental data at the near wake, amplifying the differences between the simplified models.