My simulation consists of material flowing down a barrel to a contraction to counterbore and then through a capillary.
Pressure at the capillary outlet is supposed to zero, since flow is directed downstream, which was even observed with the resulting vectors. However it dropped to a negative pressure at the outlet (z=1.5mm).
I used adaptive sizing, and set element size to 0.0075 mm. Using this , I obtained fairly accurate shear rates and velocities. I was wondering what changes could be made to make sure the pressure drops to 0 at the lowest.