Simulação computacional do escoamento sobre um aerofólio NREL S809

Abstract

The main objective of this study is to verify the precision of the NREL S809 airfoil’s CFD analysis which was performed using the commercial software ANSYS Fluent, comparing the data obtained in CFD with experimental data. The airfoil in question operates in low Reynolds numbers due to the focus of its development being the use in wind turbines. From the concepts related to computational fluid dynamics (CFD) exposed in this report, the appropriate input parameters were chosen for the simulation in question, especially with regard to the boundary layer modeling considering the RANS k-w SST turbulence model and the regions with more refinement around the airfoil. In order to verify the quality of the simulation, it was analyzed the convergence of meshes successively refined and the boundary limit modelling through the dimensionless parameter y+ , where both parameters presented good results. Among the experimental data available in the used documentation, it was chosen the data for flow with Reynolds number equal to 2*10e6 , where the graphs analyzed were the curves correlating the angle of attack with the drag and lift coefficients, and also the graphs correlating the pressure coefficient along the airfoil’s chord. And, concluding the analysis, it was verified a good modelling of the flow with greater divergencies when the airfoil is subjected to a stall regime due to the need to model the turbulent effects in RANS turbulence models.