Aslam-o-alaikum: Actually I am analysing a NACA 0012 wing in wind tunnel. I have to find pressure distribution on its surface. I have used 3D Coupled Implicit S-A model. I have applied operating pressure conditions both as 101325 pascals and 0 pascals, but while checking its contours it gives min value of static pressure in negative values in both the cases. I kindly request you to solve my this querie. Is it like this that I should subtract that min value from atmospheric pressure and add up the max value? Should this min value be always greater than atmospheric pressure or it can be smaller than that also? Also my wind tunnel is low subsonic wind tunnel. i.e I am simulating the model at a speed of 48 m/sec. I please need your guidance regarding this issue.

you can get static pressure to be negative, but the absolute & total pressure should be checked for, if they are positive i guess u'r solution would be right unless otherwise u have given wrong boundry conditions.