High and negative value of coeff of drag and lift
 

I am analysing compressible flow of mach 0.8 past cylinder(2D) . In flow field i initialized left side as pressure far field and right side as pressure outlet. I have set operating pressure to 0 pa and gauge pressure to 76000pa .
I am getting cd = 40 and cl = -8 and more abrupt results . Why?
I am using K - omega turbuelence model...with density based solver.