The Onera elsA CFD software is both a software package capitalizing the innovative results of research over time and a multi-purpose tool for applied CFD and multi-physics. The research input from Onera and other laboratories and the feedback from aeronautical industry users allow enhancement of its capabilities and continuous improvement. The paper presents recent accomplishments of varying complexity from research and industry for a wide range of aerospace applications: aircraft, helicopters, turbomachinery ...

This paper deals with results from on-going research at ONERA, regarding validation of turbulence models for flows close to the onset of airfoil buffeting. Two- as well as three-dimensional steady RANS computations have been applied to few test cases, turbulence closure being achieved using standard transport equation models. First attempts of unsteady Navierr-Stokes computations are also evoked.

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.