AHA, maybe it is a frame of reference thing…

I have made the assumption that wall Shear Stress results from air molecules acting on the geometry surface.

What if it is mean’t to signify the forces that have to be imparted on the air molecules at the geometry surface face where ‘y’ = 0 (where ‘y’ is distance from surface) and where the air molecules must be held stationary and also floating at ‘y’=0, at their location, by the vector force of (wallShearStressVector * cell_area)? In that case, it would be a vector, of opposite direction, from the Wall Shear Stress Vector that I am integrating (and hence there would be a -1 component value multiplication needed on all 3 axis…

Is that really an inconsistent frame of reference?

There is so little documented about Wall Shear Stress… and I could find no examples of the integration of it…

I even asked for help to do it correctly but nobody here seemed to have done it before.

Kudos, to Ric if this is truly the answer…