NUMERICAL SIMULATION OF BUFFETING OVER AIRFOIL USING DUAL TIME-STEPPING METHOD

The Dual Time Stepping (DTS) method is applied to the numerical simula- tion of buffeting phenomenon around airfoils, using a Reynolds-Averaged Navier-Stokes (RANS) solver with transport equation turbulence models. The DTS method has been firstly validated on a eighteen percent thickness circular arc airfoil. Then, workhas been done on the RA16SC1 airfoil in order to compare the com- putational performances of the DTS method with a time-explicit method and to explore both the influence of the time-marching steady-state solver on the numerical performances and the effect of several numerical parameters on the results. The computational performances demonstrate the influence of the resolution strategy on decoupled RANS/turbulent systems of equations. Furthermore, the results prove the great efficiency of the DTS method relatively to the time-explicit one. At last, comparison be- tween the numerical predictions and the experimental data are in fair agreement with respect to the frequency of the shockinduced oscillation.

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