Numerical simulations of the NREL S826 airfoil

The Science of Making Torque from Wind

Sagmo, K.F.^1 ; Bartl, J.^1 ; Sætran, L.^1

Norwegian University of Science and Technology, Trondheim

NO-7491, Norway^1

关键词: Angles of attack;    K-epsilon turbulence model;    Lift and drag coefficients;    Lift coefficient;    RANS turbulence models;    Steady-state simulations;    Surface pressures;    Volumetric rendering;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/8/082036/pdf
DOI  :  10.1088/1742-6596/753/8/082036

来源: IOP

【 摘 要 】

2D and 3D steady state simulations were done using the commercial CFD package Star-CCM+ with three different RANS turbulence models. Lift and drag coefficients were simulated at different angles of attack for the NREL S826 airfoil at a Reynolds number of 100 000, and compared to experimental data obtained at NTNU and at DTU. The Spalart-Allmaras and the Realizable k-epsilon turbulence models reproduced experimental results for lift well in the 2D simulations. The 3D simulations with the Realizable two-layer k-epsilon model predicted essentially the same lift coefficients as the 2D Spalart-Allmaras simulations. A comparison between 2D and 3D simulations with the Realizable k-epsilon model showed a significantly lower prediction in drag by the 2D simulations. From the conducted 3D simulations surface pressure predictions along the wing span were presented, along with volumetric renderings of vorticity. Both showed a high degree of span wise flow variation when going into the stall region, and predicted a flow field resembling that of stall cells for angles of attack above peak lift.