Unsteady N-S calculations using a dual-time stepping method for airfoil oscillating at high angle of attack

摘要

A dual-time stepping method is used to solve the unsteady two-dimensional Navier-Stokes equations for the unsteady motion of airfoil oscillating at high angle of attack. Results obtained from single grid and multigrid calculations are given and compared with the experimental data. The influence of the magnitude of physical time step, the inner iteration tolerance, the cycle type and number of the grid level included in multigrid calculations, the transitionpoints is also discussed. The efficiency of present method is increased a great deal compared explicit methods.