Unusual result on surface
 

Hi,

I'm working on a pipe like geometry (it's not cylinder). The pressure in outlet is 0.1 (m2/s2)and velocity in inlet is 0.05 (m/s), wall velocity is fixed value (uniform (0 0 0)) and its pressure is zero gradient. I run the case with icoFoam to see the results. It's showing that velocity is higher in the surface in compare to bulk! one picture of cross-section attached to show the higher velocity on surface and the geometry of case.

Thanks for your comments and help
Kind Regards

another note!
 

again Hi!

I just want to add sth!! when I increase the kinematic viscosity from 1e-6 to 0.1, higher velocity is in the bulk instead of surface and makes more sense.

I'm still waiting for any comments :)