Abstract
Transonic flow past a two–element Whitcomb airfoil is studied in the range of free–stream Mach numbers between 0.81 and 0.86. Numerical solutions of the Reynolds–averaged Navier–Stokes (RANS) equations are obtained with a finite–volume solver on unstructured meshes using several turbulence models. Both smooth and rough airfoil surfaces are considered. The study reveals free–stream conditions that admit extreme sensitivity of aerodynamic coefficients to small changes of the aileron deflection. In addition, computations demonstrate free–stream conditions in which aileron deflections produce no effect on the lift.
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