Zonal Detached Eddy Simulation (ZDES) of an airfoil in post-stall condition

This paper presents a Zonal Detached Eddy Simulation (ZDES) of a leading-edge stall airfoil in post-stall conditions. Different DES-type methodologies are first evaluated and discussed. The results obtained with the selected approach are presented and compared to detailed experimental results including unsteady pressure measurements and unsteady velocity flow field measurements obtained using Time-Resolved PIV (TR-PIV) and Laser Doppler Velocimetry (LDV). Important features of the flow are correctly captured by the computation and good agreements are observed with experiment on pressure distribution, separation location and aerodynamic forces. Unsteady content of the numerical simulation is also confronted with unsteady measurements showing that the St=0.2 frequency corresponding to the vortex separation shedding is correctly predicted in the computation. Detailed analysis of the mixing-layer and the wake properties highlights some deficiency of the computations that are fully analysed. The detailed comparisons of the ZDES result with the experimental data allow general requirements to be drawn for further improvements.

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