[fsalvucci]

Hi everyone!! I need a little help. I'm performing a 3D simulation of laminar, incompressible flow in a straight pipe. When analizing my results, i found them a little bit confusing. The thing is, that, instead of finding that the flow is parabolic, it develops into a parabolic-like profile but "translated" from the origin, that is, a parabolic manner but that in the walls is not zero. The detalis of the results can be seen in the attached images.

As boundary conditions for U, i set a parabolic profile with max_vel = 0.46 m/s at inlet, zeroGradient at outlet, and zero for the wall.
For p, i set it to zero at the outlet. (see the o files for U and p attached)

I also attach the fvSolution and fvSchemes files.

In addition, i check the residuals, and they seem to converge nicely (see Ux residual plot attached)

The tubes dimensions are diamater = 0.003 m and lenght = 0.01 m, the cinematic viscosity (nu) is 3e-6, and turbulence is off.

Anyone may have an idea of what is happening?