Thanks you very much, i have succeed to launch a calcul.

But the results are not really acceptable.

I think i really don't understand the syntax of the boundary conditions.
If i am right, the group is the nomber in the last column of the mesh file in the points definitions but when i launch the simulation, the hole domain is affected.

In fact, i need to impose a field of temperature on the edges of the airfoil, this is why i try to understand how to impose a temperature at one node of the mesh.