Investigation of Airfoil Unsteady Aerodynamic Characteristics Based on Finite Macro-Element and TFI Hybrid Dynamic Mesh Correction

The hybrid dynamic mesh method combining finite macro-element with transfinite interpolation (TFI) is adopted in this paper which ensures mesh quality for large deformations and high efficiency. Besides, TFI is modified to preserve the grid orthogonality near the boundary using rotation correction and weighted approach in order to solve its orthogonal problem. The numerical simulation of oscillating airfoil is performed by solving Reynolds Averaged Navier-Stokes (RANS) equations with hybrid dynamic mesh method. The influences of oscillation parameters and Mach number on the hysteresis effect are investigated and the separation vortex pattern and evolution procedure are presented. Moreover, numerical results show the occurrence of lock-in zone. The effect of oscillation amplitude and frequency on it and the characteristics of vortex shedding are discussed.