Aerodynamic analysis of high-lift airfoils by a dual-timeintegration method with upwind splitting

摘要

A dual time-step integration method with a preconditioned upwindscheme for the simulation of low Mach number flow is applied to anaerodynamic analysis of high-lift airfoils. Third-order fluxextrapolation in conjunction with Roe's (1981) flux splitting is chosenfor spatial discretization. An implicit real-time discretization is usedand the governing equations are evaluated by a two-stage Runge-Kuttascheme, while converged solutions are calculated in eachpseudo-time-step. Also, local time stepping and residual smoothingmethods are implemented to accelerate convergence. Aerodynamic loadingof high-lift systems, including an oscillating NACA0012 airfoil and aNACA4412 airfoil with a Gurney flap, are simulated in this study. Thesimulated results show that the numerical predictions agree with thevalidated computed results or experimental data. The performancestatistics of parallelization and vectorization on Cray and Fujitsuvector machines for the current study are also investigated