couette flow

thiagobaixo

i try to simulate a flow between two parallel plates, the couette flow. i´m using a 2D structured grid.

The fact is that i´m not getting the parabolic profile. I try to refine the grid, and it looks fine, so i think that the problem is not concerned with the grid´s quality.

My domain is:

x = 3 m; y= 1 m;

The reynolds number is 10, therefore the laminar condition is OK.

My boundary conditions are:

1- The flow into in the domain with a velocity equal 0.0005 m/s;

2- The outlet condition is 0 Pa, relative static pressure;

3- symmetry conditions;

4- no slip condition in y = 0 and y= 1.

when i plot the profile velocity in post, i generaly use a line in the Y direction, and plot a chart of velocity u in x axis against Y in y axis.

the result is not the parabolic profile.

the point where i get the result is far away from the inlet, hence the flow is completely developed.

where am i wrong ?

please help me !!!

best regards !!