Mean airfoil surface pressure coefficient at zero degree angle-of-attack: predicted results (a) and experimental data (b). The upper triangle symbols correspond to the experimental data from [24] at with the transition fixed at the 5-percent-chord model station. The down triangle symbols correspond to the experimental data from [24] at with the transition fixed at the 5-percent-chord model station. The square symbols correspond to the experimental data from [24] at for a free transition. The right triangle symbols (with the solid line) represent the experimental data from [23] at for a free transition.