Comparaison between results given by the simulations with the coarse and te finer mesh :

The comparaison of the lift and drag obtained give the following results :

red : coarse mesh polar
Black : fine mesh polar

black : fine mesh lift
blue : coarse mesh lift
red : fine mesh drag
green : coarse mesh drag

These results are very similar, and both heve the same surprising caracteristic : there is no stall. The similarity of these results also show that the mesh is not responsible for the bad quality of the lift and drag obtained, but that the problem really comes from the Euler equations. The results obtained at lower incidence might be right, but there is no way of verifying so, having no experimental data to compare.