[maCrobo]

Hello everyone, I picked up the pitzDaily tutorial, changed its geometry in a 2D rectangle, switched off turbulence and tried to simulate the very well known case of an incompressible flow through two parallel planes with a Reynolds equal to 100. The height of the rectangle is 1/15 its length.

I started with a relative coarse grid and plotted the resulting Ux profile along the Y axis. The analytic solution gives a parabola, that is the trend I got from the coarse grid. If I decrease the cell size, the profile starts to flatten, and it gets closer to a case where the Reynolds increases or the viscosity decreases.
I do not understand why.

If you want to reproduced it, I attached it in here. I firstly tried a sampleGrading (150 10 0), then (1200 80 0).