Abstract:
As the prediction of aerodynamic performance of real complex configuration aircraft has been paid more and more attention in recent years, the first aeronautics CFD credibility workshop was launched in China. The grid convergence study was conducted in the paper based on the in-house solver HyperFLOW for the 2D NACA0012 airfoil subsonic turbulent flow. Good grid convergence performance was demonstrated in the turbulent flow simulations. We adopted the transport model CHN-T1 in the two test cases required by the workshop to validate the performance of HyperFLOW for complex configurations. The first test case is the grid convergence study at the fixed lift coefficient
CL=0.5(±0.001), and the second one is buffet study with the influences of support system and static elastic deformation. We also studied the effect of turbulence models on the aerodynamic prediction accuracy. The observed order of accuracy and grid convergence index (GCI) show that, good grid convergence property and credibility were obtained, and the support system may significantly affect the aerodynamic moments. In addition, the elastic deformation also plays a non-negligible role in accurate aerodynamic prediction. The numerical predictions agree well with the experimental measurement with the support system and static elastic deformation. Original SA turbulence model with quadratic constitutive relation (QCR) has slight influence on the moment, since side of body (SOB) separations are not observed around the CHN-T1 model.