Turbulence Modeling Investigation of Airfoil Designed for Wind Turbine Applications

摘要

The present work deals with the numerical investigation of the flow around a two-dimensional geometry of an airfoil type NREL S809, which has been designed for wind turbine applications via the CFD technique. The turbulence models employed and evaluated for angles of attack ranging from 0° to 20° were the Spalart-Allmaras, the k-s Realizable, the k-co Shear Stress Transport (SST) and the Transition SST. The results of the simulations for the lower angles of attack generally agree with the available corresponding experimental data. However, decreased accuracy of the models is observed once flow separation starts to occur. In sequence, for this purpose, the modified versions of the k-co SST and the Transition SST models were adjusted significantly improving the models' performance over the whole range of angles of attack.