Y+ values
 

I am new to the Ansys Fluent. I want to a calculate 3d object drag coefficient but it doesn't consistent with real values so i susptect my mesh. I share my y+ values. Is it correct ?
p.s. I use spalart - allmaras models, compressible flow (ideal gas with viscosity model is sutherland), v0 = 2.8 mach, inlet boundary conditions far field pressure and outlet conditions pressure outlet. (Sorry my English.)

SA Model
 

Though SA model is less sensitive to near wall mesh quality, still, you need to use a mesh much finer than that you have. should be of order 1, i.e., below 10 to give good accuracy.