Pressure Coefficient Viscous Coefficient
 

Hi,
I need your help. I do not understand, how Fluent calculate the pressure Coefficient and Viscous Coefficient, if I let report the force at a wall.
I tried to work with fluent help Cp=(P-Pref)/q ref but did not get the same value.
I did not find anything in help about viscous coefficient.

Hope so much, that somebody can explain me these coefficient.