Transonic Buffet Simulation over Supercritical Airfoil by Unsteady-FaSTAR Code

Predicting transonic buffet over an aircraft is one of the challenging problems for current CFD community because the phenomenon is complex and unsteady. JAXA started to develop RANS/LES hybrid approaches to tackle unsteady flow problems including transonic buffet aimed for high-fidelity CFD tool. In this paper, we simulate transonic buffet over a super-critical airfoil using FaSTAR code developed by JAXA. Two approaches are employed and implemented to FaSTAR code for the unsteady flow simulations, IDDES and Zonal DES which are RANS/LES hybrid approach and the variant of DES model. Results from these approaches are compared with the past research and the experimental data through 3D computations.